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KEP ES-749 Operating Manual

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ES749
Utility Metering Flow CoMpUter
99718 01/31/17
ES749 Flow Computer
CONTENTS
SAFETY INSTRUCTIONS .............................................................................................................1
1. INTRODUCTION
1.1 Unit Description ............................................................................................................ 2
1.2 Specications ...............................................................................................................3
2. INSTALLATION
2.1 General Mounting Hints ................................................................................................ 8
2.2 Mounting Diagrams ...................................................................................................... 8
3. APPLICATIONS
3.2 Steam Heat ................................................................................................................. 11
3.5 Corrected Gas Volume ...............................................................................................15
3.6 Gas Mass ...................................................................................................................16
3.7 Gas Combustion Heat ................................................................................................ 17
3.8 Corrected Liquid Volume ............................................................................................18
3.9 Liquid Mass ................................................................................................................19
3.10 Liquid Combustion Heat ........................................................................................... 20
4. WIRING
5. UNIT OPERATION
6. PROGRAMMING
ES749 Flow Computer
CONTENTS
7. PRINCIPLE OF OPERATION
7.3.13 ILVA Flow Meter Equations ..................................................................... 100
7.4 Computation of the D.P. Factor ................................................................................101
8. RS-232 SERIAL PORT
8.1 RS-232 Serial Port Description ................................................................................. 102
8.2 Instrument Setup by PC Over Serial Port ................................................................ 102
8.3 Operation of Serial Communication Port with Printers ............................................. 102
8.4 SUPERtrol II RS-232 Port Pinout ............................................................................. 102
9. RS-485 SERIAL PORT
9.1 RS-485 Serial Port Description ................................................................................. 103
9.2 General ..................................................................................................................... 103
9.3 Operation of Serial Communication Port with PC .................................................... 103
9.4 SUPERtrol II RS-485 Port Pinout ............................................................................. 103
10. FLOW COMPUTER SETUP SOFTWARE
10.1 System Requirements ............................................................................................ 104
10.2 Cable and Wiring Requirements ............................................................................. 104
10.3 Installation ..............................................................................................................104
10.4 Using the Flow Computer Setup Software ............................................................. 104
10.5 File Tab ................................................................................................................... 105
10.6 Setup Tab ............................................................................................................... 105
10.7 View Tab ................................................................................................................. 106
10.8 Misc. Tab ................................................................................................................ 106
11. GLOSSARY OF TERMS
10 Glossary Of Terms ..................................................................................................... 107
12. Diagnosis and Troubleshooting
12.1 Response of SUPERtrol II on Error or Alarm .......................................................... 110
12.2 Diagnosis Flowchart and Troubleshooting .............................................................. 11 0
12.3 Error Messages .......................................................................................................111
Appendix A
Fluid Properties Table ..................................................................................................... 114
Appendix B - Setup Menus
Setup Menus with Operator Code Access ...................................................................... 115
Setup Menus with Supervisor Code Access ................................................................... 116
Appendix C - RS-485 Modbus Protocol
Description ...................................................................................................................... 117
Wiring Pinout and Installation ......................................................................................... 118
Register and Coil Usage .................................................................................................120
Warranty .....................................................................................................................................123
Decoding Part Number ................................................................................................................ 123
ES749 Flow Computer
!
SAFETY INSTRUCTIONS
The following instructions must be observed.
• This instrument was designed and is checked in accordance with regulations in force EN 60950 (“Safety of information technology equipment, including electrical business equipment”).
A hazardous situation may occur if this instrument is not used for
its intended purpose or is used incorrectly. Please note operating instructions provided in this manual.
• The instrument must be installed, operated and maintained by personnel who have been properly trained. Personnel must read and understand this manual prior to installation and operation of the instrument.
• The manufacturer assumes no liability for damage caused by incorrect
use of the instrument or for modications or changes made to the
instrument.
Technical Improvements
• The manufacturer reserves the right to modify technical data without prior notice.
1
1. Introduction
ES749 Flow Computer
1.1 Unit Description:
The SUPERtrol II (ES749) Flow Computer satises the instrument requirements for a variety of owmeter types in liquid, gas, steam and heat applications. Multiple ow equations are available in a
single instrument with many advanced features.
The alphanumeric display offers measured parameters in easy to understand format. Manual access to measurements and display scrolling is supported.
The versatility of the Flow Computer permits a wide measure of applications within the instrument package. The various hardware inputs and outputs can be “soft” assigned to meet a variety of common application needs. The user “soft selects” the usage of
each input/output while conguring the instrument.
The isolated analog output can be chosen to follow the volume
ow, corrected volume ow, mass ow, heat ow, temperature,
pressure, or density by means of a menu selection. Most hardware features are assignable by this method.
The user can assign the standard RS-232 Serial Port for data logging, or transaction printing, or for connection to a modem for remote meter reading.
A PC Compatible software program is available which permits the
user to rapidly redene the instrument conguration.
Language translation option features also permit the user to dene
his own messages, labels, and operator prompts. These features may be utilized at the OEM level to creatively customize the unit for an application or alternately to provide for foreign language translations. Both English and a second language reside within the unit.
NX-19 option Advanced ordering options are available for Natural Gas calculations where the user requires compensation for compressibility effects. Compensation for these compressibility effects are required at
medium to high pressure and are a function of the gas specic
gravity, % CO2, % Nitrogen, as well as temperature and pressure. The compressibility algorithm used is that for NX-19.
Stacked differential pressure transmitter option This option permits the use of a low range and high range DP
transmitter on a single primary element to improve ow transducer
and measurement accuracy.
Peak demand option
This option permits the determination of an hourly averaged ow
rate. Demand last hour, peak demand and time/date stamping for applications involving premium billing.
Data logging option This option provides data storage information in 64k of battery backed RAM. Items to be logged, conditions to initiate the log and a variety of utilities to clear and access the data via the RS-232 port are provided.
Peak Demand Option There are applications where customer charges are determined
in part by the highest hourly averaged owrate observed during
a billing period. The peak demand option for the ES749 is intended for applica­tions where it is important to compute such an hourly average owrate, to note the value of the peak occurrence and the cor­responding time and date of that event. The demand last hour rate is computed based on the current total and the total 60 minutes prior. This value is recomputed every 5 minutes. The peak demand is the highest value observed in the demand last hour. The time and date stamp is the time and date at which the high­est peak demand occurred. The Demand Last Hour and/or Peak Demand can be directly viewed on the display by pressing the RATE key and then scrolling through the rates with the ^/v arrow key until the de­sired item is viewed. The Peak Time and Date stamp can be viewed on the display by pressing the TIME and then scrolling through the time re­lated parameters using the ^/v arrow keys until the desired item is viewed. All of these items can be included into the scrolling display list along with the other process values and totalizers in a user selectable list. The peak demand may be cleared by pressing the CLEAR key while viewing the PEAK DEMAND or by means of a command on the serial port. The Peak Time and Date stamp can be viewed on the display by pressing the TIME and then scrolling through the time re­lated parameters using the ^/v arrow keys until the desired item is viewed. The Demand Last Hour and Peak Demand can be assigned to one of the analog outputs. The demand last hour or peak demand could thusly be output on a recording device such as a strip chart recorder or fed into a building energy automation system. The Demand Last Hour and Peak Demand can be assigned
to one of the relays. The customer can be notied that he is
approaching or exceeding a contract high limit by assigning the demand last hour to one of the relays and setting the warn­ing point into the set point. A warning message would also be displayed. The peak demand may be used in conjunction with the print list
and data logger to keep track of hourly customer usage proles.
The Demand Last Hour, Peak Demand, and Time and Date Stamp information can be accessed over the serial ports. The Peak Demand may also be reset over the serial ports. The peak demand option may also be used as a condition to call out in remote metering by modem.
EZ Setup
The unit has a special EZ setup feature where the user is guided
through a minimum number of steps to rapidly congure the
instrument for the intended use. The EZ setup prepares a series
of questions based on ow equation, uid, and owmeter type
desired in the application.
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ES749 Flow Computer
1.2 Specications:
Environmental
Operating Temperature: 0 to +50 C Storage Temperature: -40 to +85 C Humidity : 0-95% Non-condensing Materials: UL, CSA, VDE approved
Approvals: CE Approved Light Industrial, UL/CSA Pending
Display
Type: 2 lines of 20 characters Types: Backlit LCD, OLED and VFD ordering options Character Size: 0.3" nominal User selectable label descriptors and units of measure
Keypad
Keypad Type: Membrane Keypad Keypad Rating: Sealed to Nema 4 Number of keys: 16 Raised Key Embossing
Enclosure
Enclosure Options: Panel, Wall, Explosion Proof Size: See Chapter 2; Installation Depth behind panel: 6.5" including mating connector Type: DIN Materials: Plastic, UL94V-0, Flame retardant
Bezel: Textured per matt nish
Equipment Labels: Model, safety, and user wiring
NX-19 Compressibility Calculations
Temperature -40 to 240 F Pressure 0 to 5000 psi
Specic Gravity 0.554 to 1.0
Mole % CO2 0 to 15% Mole % Nitrogen 0 to 15%
Power Input
The factory equipped power options are internally fused.
An internal line to line lter capacitor is provided for added
transient suppression. MOV protection for surge transient is also supported
Universal AC Power Option: 85 to 276 Vrms, 50/60 Hz Fuse: Time Delay Fuse, 250V, 500mA DC Power Option: 24 VDC (16 to 48 VDC) Fuse: Time Delay Fuse, 250V, 1.5A Transient Suppression: 1000 V
Flow Inputs:
Flowmeter Types Supported:
Linear: Vortex, Turbine, Positive Displacement, Magnetic,
GilFlo, GilFlo 16 point, ILVA 16 Point, Mass Flow and others
Square Law:
Orice, Venturi, Nozzle, V-Cone, Wedge, Averaging
Pitot, Target, Verabar, Accelabar and others
Multi-Point Linearization:
May be used with all owmeter types. Including: 16
point, UVC and dynamic compensation.
Analog Input:
Ranges Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC Current: 4-20 mA, 0-20 mA Basic Measurement Resolution: 16 bit Update Rate: 2 updates/sec minimum Accuracy: 0.02% FS Automatic Fault detection: Signal over/under-range, Current Loop Broken Calibration: Operator assisted learn mode. Learns Zero
and Full Scale of each range Fault Protection: Fast Transient: 1000 V Protection (capacitive clamp) Reverse Polarity: No ill effects Over-Voltage Limit: 5 0 V D C O v e r v o l t a g e protection Over-Current Protection: Internally current limited protected to 24 VDC Optional: Stacked DP transmitter 0-20 mA or 4-20 mA
Pulse Inputs:
Number of Flow Inputs: one Input Impedance: 10 kΩ nominal Trigger Level: (menu selectable) High Level Input Logic On: 2 to 30 VDC Logic Off: 0 to .9 VDC Low Level Input (mag pickup) Selectable sensitivity: 10 mV and 100 mV Minimum Count Speed: 0.25 Hz Maximum Count Speed: Selectable: 0 to 40 kHz Overvoltage Protection: 50 VDC Fast Transient: Protected to 1000 VDC (capacitive clamp)
Temperature, Pressure, Density Inputs
The compensation inputs usage are menu selectable for temperature, temperature 2, pressure, density, steam trap monitor or not used.
Calibration: Operator assisted learn mode Operation: Ratiometric Accuracy: 0.02% FS Thermal Drift: Less than 100 ppm/C Basic Measurement Resolution: 16 bit Update Rate: 2 updates/sec minimum Automatic Fault detection: Signal Over-range/under-range Current Loop Broken RTD short RTD open Transient Protection: 1000 V (capacitive clamp) Reverse Polarity: No ill effects Over-Voltage Limit (Voltage Input): 50 VDC Over-Current Limit (Internally limited to protect input to 24 VDC)
Available Input Ranges (Temperature / Pressure / Density / Trap Monitor) Current: 4-20 mA, 0-20 mA Resistance: 100 Ohms DIN RTD
100 Ohm DIN RTD (DIN 43-760, BS 1904): Three Wire Lead Compensation Internal RTD linearization learns ice point resistance 1 mA Excitation current with reverse polarity protection Temperature Resolution: 0.1°C Temperature Accuracy: 0.5°C
3
ES749 Flow Computer
Datalogger (optional)
Type: Battery Backed RAM Size: 64k Initiate: Key, Interval or Time of Day Items Included: Selectable List Data Format: Printer or CSV Access via RS-232 command
Stored Information (ROM)
Steam Tables (saturated & superheated), General Fluid Properties, Properties of Water, Properties of Air, Natural Gas
User Entered Stored Information (EEPROM / Nonvolatile RAM)
Transmitter Ranges, Signal Types Fluid Properties (specific gravity, expansion factor, specific heat, viscosity, isentropic exponent, combustion heating value, Z factor, Relative Humidity) Units Selections (English/Metric)
RS-232 Communication
Uses: Printing, Setup, Modem, Datalogging Baud Rates: 300, 1200, 2400, 9600 Parity: None, Odd, Even Device ID: 0 to 99 Protocol: Proprietary, Contact factory for more information Chassis Connector Style: DB 9 Female connector Power Output: 8V (150 mA max.) provided to Modem
RS-485 Communication (optional)
Uses: Network Communications Baud Rates: 300, 600, 1200, 2400, 4800, 9600, 19200 Parity: None, Odd, Even Device ID: 1 to 247 Protocol: ModBus RTU Chassis Connector Style: DB 9 Female connector (standard)
Excitation Voltage
24 VDC @ 100 mA overcurrent protected
Relay Outputs
The relay outputs usage is menu assignable to (Individually for each relay) Hi/Lo Flow Rate Alarm, Hi/Lo Temperature Alarm, Hi/Lo Pressure Alarm, Pulse Output (pulse options), Wet Steam or General purpose warning (security). (Peak demand and demand last hour optional)
Number of relays: 2 (3 optional) Contact Style: Form C contacts (Form A with 3 relay option) Contact Ratings: 240 V, 1 amp Fast Transient Threshold: 2000 V
Analog Outputs
The analog output usage is menu assignable to correspond to the Heat Rate, Uncompensated Volume Rate, Corrected Volume Rate, Mass Rate, Temperature, Density, or Pressure. (Peak demand and demand last hour optional)
Number of Outputs: 2 Type: Isolated Current Sourcing (shared common) Isolated I/P/C: 500 V Available Ranges: 0-20 mA, 4-20 mA (menu selectable) Resolution: 16 bit Accuracy: 0.05% FS at 20 Degrees C Update Rate: 5 updates/sec Temperature Drift: Less than 200 ppm/C Maximum Load: 1000 ohms Compliance Effect: Less than .05% Span 60 Hz rejection: 40 dB minimum EMI: No effect at 10 V/M Calibration: Operator assisted Learn Mode Averaging: User entry of DSP Averaging constant to cause an smooth control action
Isolated Pulse output
The isolated pulse output is menu assignable to Uncompensated Volume Total, Compensated Volume Total, Heat Total or Mass Total. Isolation I/O/P: 500 V Pulse Output Form (menu selectable): Open Collector NPN or
24 VDC voltage pulse
Nominal On Voltage: 24 VDC Maximum Sink Current: 25 mA Maximum Source Current: 25 mA Maximum Off Voltage: 30 VDC Saturation Voltage: 0.4 VDC Pulse Duration: User selectable Pulse output buffer: 8 bit
Real Time Clock
The Flow Computer is equipped with either a super cap or a battery backed real time clock with display of time and date. Format: 24 hour format for time Day, Month, Year format for date Daylight Savings Time (optional)
Measurement
The Flow Computer can be thought of as making a series
of measurements of ow, temperature/density and pressure
sensors and then performing calculations to arrive at a result(s) which is then updated periodically on the display. The analog outputs, the pulse output, and the alarm relays are also updated. The cycle then repeats itself.
Step 1: Update the measurements of input signals-
Raw Input Measurements are made at each input using equations based on input signal type selected. The system notes the “out of range” input signal as an alarm condition.
Step 2: Compute the Flowing Fluid Parameters-
The temperature, pressure, viscosity and density equations
are computed as needed based on the ow equation and input
usage selected by the user.
4
ES749 Flow Computer
Step 3 : Compute the Volumetric Flow-
Volumetric ow is the term given to the ow in volume units. The value is computed based on the owmeter input type
selected and augmented by any performance enhancing
linearization that has been specied by the user.
Step 4: Compute the Corrected Volume Flow at Reference
Conditions-
In the case of a corrected liquid or gas volume ow calculation, the corrected volume ow is computed as required by the
selected compensation equation.
Step 5 : Compute the Mass Flow-
All required information is now available to compute the mass
ow rate as volume ow times density. A heat ow computation
is also made if required.
Step 6: Check Flow Alarms-
The ow alarm functions have been assigned to one of the above ow rates during the setup of the instrument. A comparison is now made by comparing the current ow rates against the specied hi and low limits.
Step 7: Compute the Analog Output-
This designated ow rate value is now used to compute the
analog output.
Step 8: Compute the Flow Totals by Summation-
A ow total increment is computed for each ow rate. This increment is computed by multiplying the respective ow rate
by a time base scaler and then summing. The totalizer format also includes provisions for total rollover.
Step 9: Pulse Output Service-
The pulse output is next updated by scaling the total increment which has just been determined by the pulse output scaler and summing it to any residual pulse output amount.
Step 10: Update Display and Printer Output-
The instrument nally runs a task to update the various table
entries associated with the front panel display and serial outputs.
Instrument Setup
The setup is password protected by means of a numeric lock out code established by the user. The help line and units of measure prompts assure easy entry of parameters.
An EZ Setup function is supported to rapidly congure the instrument for rst time use. A software program is also
available which runs on a PC using a RS-232 Serial for connection to the Flow Computer. Illustrative examples may be down loaded in this manner.
The standard setup menu has numerous subgrouping of
parameters needed for ow calculations. There is a well
conceived hierarchy to the setup parameter list. Selections made at the beginning of the setup automatically affect offerings further down in the lists, minimizing the number of questions asked of the user.
In the setup menu, the ow computer activates the correct setup variables based on the instrument conguration, the ow equation, and the hardware selections made for the compensation transmitter type, the ow transmitter type,
and meter enhancements (linearization) options selected. All required setup parameters are enabled. All setup parameters not required are suppressed.
Also note that in the menu are parameter selections which have preassigned industry standard values. The unit will assume
these values unless they are modied by the user.
Most of the process input variables have available a “default” or emergency value which must be entered. These are the values that the unit assumes when a malfunction is determined to have occurred on the corresponding input.
It is possible to enter in a nominal constant value for temperature or density, or pressure inputs by placing the desired nominal value into the default values and selecting "manual". This is also a convenience when performing bench top tests without simulators.
The system also provides a minimum implementation of an
“audit trail” which tracks signicant setup changes to the unit. This feature is increasingly being found of benet to users or simply required by Weights and Measurement Ofcials
in systems used in commerce, trade, or “custody transfer” applications.
Simulation and Self Checking:
This mode provides a number of specialized utilities required for factory calibration, instrument checkout on start-up, and periodic calibration documentation.
A service password is required to gain access to this specialized mode of operation. Normally quality, calibration,
and maintenance personnel will nd this mode of operation
very useful.
Many of these tests may be used during start-up of a new system. Output signals may be exercised to verify the electrical interconnects before the entire system is put on line.
The following action items may be performed in the Diagnostic Mode:
Print Calibration/Maintenance Report View Signal Input (Voltage, Current, Resistance, Frequency) Examine Audit Trail Perform a Self Test Perform a Service Test View Error History Perform Pulse Output Checkout / Simulation Perform Relay Output Checkout / Simulation Perform Analog Output Checkout / Simulation Calibrate Analog Inputs using the Learn Feature Calibrate Analog Output using the Learn Feature Schedule Next Maintenance Date
Note that a calibration of the analog input/output will advance the audit trail counters since it effects the accuracy of the system.
5
ES749 Flow Computer
Operation of Steam Trap Monitor
In applications on Saturated Steam, the otherwise unused Compensation Input may be connected to a steam trap monitor that offers the following compatible output signal levels: 4mA = trap cold 12 mA = trap warm and open (blowing) 20 mA = trap warm and closed
In normal operation a steam trap is warm and periodically opens and closes in response to the accumulation of condensate. A cold trap is indication that it is not purging the condensate, a trap that is constantly blowing is an indication that it is stuck open. To avoid a false alarm, the ES749 permits the user to program a delay, or time period, which should be considered normal for the trap to be either cold, or open. An alarm will only be activated if the trap is detected as continuously being in the abnormal states for a time period greater than this TRAP ERROR DELAY time.
The user selects to use the Compensation Input for Trap Monitoring by selecting “4-20mA TRAP STATUS as the INPUT SIGNAL for OTHER INPUT1.
The user can program the ERROR DELAY time in HH:MM format into both the TRAP ERROR DELAY (cold trap error) menu and the TRAP BLOWING DELAY (trap stuck open) menu.
The ES749 will warn the operator of a TRAP ERROR when an abnormal condition is detected. The error can be acknowledged by pressing the ENTER key. However, the problem may reassert itself if there is a continued problem with the steam trap.
In addition, the event is noted in the ERROR LOG.
It is also possible for the user to program a trap malfunction as one of the conditions worthy of a CALL OUT of a problem by selecting this error in the ERROR MASK.
The Data-Logging option of the ES749 can also be used to log the performance of the trap by storing the % of time the trap has been cold, and/or blowing open during the datalog interval.
Datalogging Option
The Datalogging Option for the ES749 permits the user to automatically store sets of data items as a record on a periodic basis. A datalog record may be stored as the result of either a PRINT key depression, or an INTERVAL, or a TIME OF DAY request for a datalog.
The user denes the list of items to be included in each datalog
by selecting these in the PRINT LIST menu located within the COMMUNICATIONS SUBMENU.
The user selects what will trigger a datalog record being stored in the PRINT INITIATE menu. The choices are PRINT KEY, INTERVAL, and TIME OF DAY.
The user can also dene whether he just wants the data stored
into the datalogger, or if he wants the data both stored in the datalogger and sent out over the RS232 port in the DATALOG ONLY menu.
The user can dene the format he wishes the data to be output
in using the DATALOG FORMAT menu. Choices are PRINTER and DATABASE. PRINTER format will output the data records in a form suitable to dump to a printer. DATABASE format will output the values in a CSV, or Comma Separated Variable with Carriage return delimiting of each record.
A number of serial commands are also included to access and manipulate information stored with in the datalogger. Among these RS232 command capabilities are the following actions:
Clear Data Logger Send all Data in Datalogger Send Only New Data since Datalogger was last Read Send Data for the date included in the request
Send the column heading text for the CSV data elds
Send the column units of measure text for the CSV data
elds
Store one new record into datalogger now Read Number of New Records in the datalogger Read number of records currently in the datalogger Read the maximum number of records capacity of the
datalogger Move Pointer Back N records Dump Record at Pointer Dump records newer than pointer Dump data from N records back
The datalogger option is used in conjunction with the RS-232 port in remote metering applications.
The technical details associated with the serial commands are listed in Universal Serial Protocol Manual available upon request.
RS-232 Serial Port
The Flow Computer has a general purpose RS-232 Port which may be used for any one of the following purposes:
Transaction Printing Data Logging Remote Metering by Modem Computer Communication Link
Conguration by Computer
Print System Setup Print Calibration/Malfunction History
Instrument Setup by PC’s over Serial Port
A Diskette program is provided with the Flow Computer that
enables the user to rapidly congure the Flow Computer
using an Personnel Computer. Included on the diskette are common instrument applications which may be used as a starting point for your application. This permits the user to have an excellent starting point and helps speed the user through the instrument setup.
The user can select the datalog store interval in a HH:MM format in the PRINT INTERVAL menu.
The user can also select the store time of day in a 24 hr HH: MM format in the PRINT TIME menu.
6
ES749 Flow Computer
Operation of Serial Communication Port with Printers
The Flow Computer’s RS-232 channel supports a number
of operating modes. One of these modes is intended to support operation with a printer in metering applications requiring transaction printing, data logging and/or printing of calibration and maintenance reports.
For transaction printing, the user denes the items to be
included in the printed document. The user can also select what initiates the transaction print generated as part of the setup of the instrument. The transaction document may be initiated via a front panel key depression.
In data logging, the user denes the items to be included in
each data log as a print list. The user can also select when or how often he wishes a data log to be made. This is done during the setup of the instrument as either a time of day or as a time interval between logging.
The system setup and maintenance report list all the instrument setup parameters and usage for the current instrument configuration. In addition, the Audit trail information is presented as well as a status report listing any observed malfunctions which have not been corrected.
The user initiates the printing of this report at a designated point in the menu by pressing the print key on the front panel.
Operating Serial Communication Port with Modems
The ES749 offers a number of capabilities that facilitate its use
with modems. The ES749’s RS232 port can be connected to
a modem in order to implement a remote metering system that uses either the phone companies standard phone lines or cellular telephone system. In addition to remote meter readings, the serial commands may also be used to examine and/or make setup changes to the unit, and to check for proper operation or investigate problems. Several hundred commands are supported. A compatible industrial modem accessory and
interconnecting cabling is offered in the MPP2400N specically
designed for use with the ES749.
The ES749 and Modem can be used together to create systems with one or more of the following capabilities:
1. Poll the ES749 unit for information from a remote PC.
2. Call Out from the ES749 unit to a remote PC on a scheduled reading time and/or crisis basis
3. Some combination of the above two descriptions where the unit is polled by one PC and calls into to a different PC if a problem is detected.
The level of complexity of the ES749 to Modem connection can range from simple to more complex.
In a simple system a remote PC will call into the telephone number of the modem. The modem will answer the call, and establish a connection between the ES749 and the remote PC. An exchange of information can now occur. The ES749 will act as a slave and respond to commands and requests for information from the remote MASTER PC. The MASTER PC will end the exchange by handing up.
However, it is more common that the ES749 will be used to control the modem. In these applications the following communication menu settings would be used: RS232 USAGE = MODEM DEVICE ID, BAUD RATE, PARITY, and HANDSHAKING
are set MODEM CONTROL = YES DEVICE MASTER = YES (When multidropping several
ES749's, only one unit will be the DEVICE MASTER) MODEM AUTO ANSWER = YES (This instructs the unit
to answer incoming calls) HANG UP IF INACTIVE = YES (This instructs the unit
to hang up the line if no activities occur within several
minutes).
A more complex form of a remote metering system can be implemented where the ES749 will initiate a call to contact the remote PC at a scheduled time and/or in the event of a problem that has been detected. In these applications the ES749 has additional setup capabilities including:
The ES749 must have a unique identier assigned to
it (using the TAG NUMBER) Call Out Telephone number must be entered in the
CALL OUT NUMBER The scheduled call out time for the daily reading must
be entered in CALL OUT TIME A decision must be made whether the unit will be used
to call on error(s) in CALL ON ERROR The particular error conditions to call out on must be
dened in the ERROR MASK
The NUMBER OF REDIALS to be attempted if line is
busy must be entered in that cell HANG UP IF INACTIVE= YES will disconnect the call
if remote computer does not respond.
Consult the Universal Serial Commands User Manual for details on the individual commands supported by the ES749. Contact the Flow Applications Group for a discussion on the remote metering system capabilities you are considering.
In fact, up to ve ES749 units can share the same modem. Each
ES749 must have a unique DEVICE ID. This multidropping of
ow computers on a single modem is popular when there are several ow computers mounted near each other.
In most applications using modem communications, the
ES749’s RS232 USAGE is rst set equal to MODEM. Each
ES749 on a shared modem cable is given a unique serial device address or DEVICE ID. The BAUD RATE is commonly set to 2400, the PARITY set to NONE, and the HANSHAKING
set to NONE to complete the basic setup. The remote PC’s
communication settings are chosen to match these.
NOTE: Some modems can be congured in advance to
answer incoming calls, terminate phone connections if communications is lost. In such applications there may be no need for the ES749 to be functioning to “control” the modem. Setting the RS233 USAGE = COMPUTER will likely work.
RS-485 Serial Port (optional)
The RS-485 serial port can be used for accessing ow
rate, total, pressure, temperature, density and alarm status information. The port can also be used for changing presets and acknowledging alarms.
7
2. Installation
Dotted Line Shows Optional Bezel Kit
Panel
Cutout
5.43
(138)
2.68 (68)
Dimensions are in inches (mm)
5.67 (144)
2.83 (72)
3.43 (87)
6.18
6.15
(156)
0.5
(13)
0.28 (7.2)
0.4 (10)
ES749 Flow Computer
General Mounting Hints
Mounting Procedure
NEMA4X / IP65 Specications
2.1 General Mounting Hints:
The ES749 Flow Computer should be located in an area with a clean, dry atmosphere which is relatively free of shock and vibration. The unit is installed in a 5.43" (138mm) wide by 2.68" (68mm) high panel cutout. (see Mounting Dimensions) To mount the Flow Computer, proceed as follows:
a. Prepare the panel opening. b. Slide the unit through the panel cutout until the it touches the panel. c. Install the screws (provided) in the mounting bracket and slip the bracket over the
rear of the case until it snaps in place.
d. Tighten the screws rmly to attach the bezel to the panel. 3 in. lb. of torque must
be applied and the bezel must be parallel to the panel.
NOTE: To seal to NEMA4X / IP65 specications, supplied bezel kit must be used
and panel cannot ex more than .010".
When the optional bezel kit is used, the bezel adaptor must be sealed to
the case using an RTV type sealer to maintain NEMA4X / IP65 rating.
2.2 Mounting Diagrams: Standard Mounting
Dimensions
ES749
Mounting Bracket
Bezel Kit Mounting
ES749 Bezel Adaptor
Gasket
Mounting Bracket
8
ES749 Flow Computer
1.10 (28)
1.10 (28)
7.8 (198)
4.72 (120)
0.59 (15)
0.75” Conduit Knockouts (5 places)
1.06 (27)
9.4 (238)
7.3 (184)
2.34 (59.5)
8.4 (213.4)
4.13 (105)
2.33 (59)
0.385 (9.8)
Security Tag Provisions
0.625”ø 0.75”ø 5 places
1.10 (28)
1.10 (28)
1.10 (28)
1.10 (28)
1.10 (28)
1.10 (28)
2.2 Mounting Diagrams:
(continued)
Wall Mount (mounting option W)
NEMA4 Wall Mount (mounting option N)
9
ES749 Flow Computer
2.2 Mounting Diagrams:
(continued)
Explosion Proof Mount (mounting option E)
10
3. Applications
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
ES749 Flow Computer
STEAM MASS
3.1 Steam Mass
Measurements:
A owmeter measures the actual volume ow in a steam line. A temperature and/or
pressure sensor is installed to measure temperature and/or pressure.
Calculations:
• Density and mass ow are calculated using the steam tables stored in the ow
computer.
• With square law device measurement the actual volume is calculated from the differential pressure, taking into account temperature and pressure compensation.
• Saturated steam requires either a pressure or temperature measurement with the other variable calculated using the saturated steam curve.
• Optional steam trap monitoring using Compensation Input 1.
Input Variables:
Superheated Steam: Flow, temperature and pressure Saturated Steam: Flow, temperature or pressure
Output Results:
• Display Results
Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total, Temperature,
Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Mass or Volume Flow Rate, Temperature, Pressure Density, Peak Demand,
Demand Last Hour
• Pulse Output
Mass or Volume Total
• Relay Outputs
Mass or Volume Flow Rate , Total, Pressure, Temperature, Alarms, Peak
Demand, Demand Last Hour
Steam Mass Illustration
Calculations
Applications:
Monitoring mass ow and total of steam. Flow alarms are provided via relays and
datalogging is available via analog (4-20mA) and serial outputs.
* or Steam Trap Monitor
*
* or Steam Trap Monitor
*
Mass Flow
Mass Flow = volume ow • density (T, p)
11
ES749 Flow Computer
Temperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
Orifice Plate
with DP Transmitter
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
STEAM HEAT
3.2 Steam Heat
Measurements:
A owmeter measures the actual volume ow in a steam line. A temperature and/or
pressure sensor is installed to measure temperature and/or pressure.
Calculations:
• Density, mass ow and heat ow are calculated using the steam tables stored in the ow computer. The heat is dened as the enthalpy of steam under actual conditions
with reference to the enthalpy of water at T=0°C.
• With square law device measurement the actual volume is calculated from the differential pressure, taking into account temperature and pressure compensation.
• Saturated steam requires either a pressure or temperature measurement with the other variable calculated using the saturated steam curve.
• Optional steam trap monitoring using compensation input.
Input Variables:
Superheated Steam: Flow, temperature and pressure Saturated Steam: Flow, temperature or pressure
Output Results:
• Display Results
Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total,
Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak
Demand, Demand Last Hour
• Pulse Output
Heat, Mass or Volume Total
• Relay Outputs
Heat, Mass or Volume Flow Rate , Total, Pressure, Temperature Alarms, Peak
Demand, Demand Last Hour
Steam Heat Illustration
Calculations
Applications:
Monitoring heat ow and total heat of steam. Flow alarms are provided via relays and
datalogging is available via analog (4-20mA) and serial outputs.
*
* or Steam Trap Monitor
Heat Flow
Heat Flow = Volume ow • density (T, p) • Sp. Enthalpy of steam (T, p)
* or Steam Trap Monitor
*
12
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP4PRE 13RATE2TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
Water
Steam
STEAM NET HEAT
3.3 Steam Net Heat
Measurements:
A owmeter measures the actual volume ow in a steam line. A temperature and a
pressure sensor are installed to measure temperature and/or pressure. All measurement are made on the steam side of a heat exchanger.
Calculations:
• Density, mass ow and net heat ow are calculated using the steam tables stored in the ow computer. The net heat is dened as the difference between the heat of the steam and the heat of the condensate. For simplication it is assumed that the condensate
(water) has a temperature which corresponds to the temperature of saturated steam at the pressure measured upstream of the heat exchanger.
• With square law device measurement the actual volume is calculated from the differential pressure, taking into account temperature and pressure compensation.
• Saturated steam requires either a pressure or temperature measurement with the other variable calculated using the saturated steam curve.
• Optional steam trap monitoring using compensation input.
Input Variables:
Superheated Steam: Flow, temperature and pressure Saturated Steam: Flow, temperature or pressure
Output Results:
• Display Results
Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total,
Temperature, Pressure, Density, (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak
Demand, Demand Last Hour
• Pulse Output
Heat, Mass or Volume Total
• Relay Outputs
Heat, Mass or Volume Flow Rate , Total, Pressure, Temperature Alarms, Peak
Demand, Demand Last Hour
Steam Net Heat Illustration
Calculations
Applications:
Monitoring the thermal energy which can be extracted by a heat exchanger taking into
account the thermal energy remaining in the returned condensate. For simplication
it is assumed that the condensate (water) has a temperature which corresponds to the temperature of saturated steam at the pressure measured upstream of the heat exchanger.
Net Heat Flow
* or Steam Trap Monitor
Net Heat Flow = Volume ow • density (T, p) • [ED (T, p)– EW (T
*
)]
S(p)
ED = Specic enthalpy of steam Ew = Specic enthalpy of water T
= Calculated condensation temperature
S(p)
(= saturated steam temperature for supply pressure)
13
ES749 Flow Computer
Pressure
Transmitter
Flowmeter
Temperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP4PRE 13RATE2TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Water
Saturated Steam
STEAM DELTA HEAT
3.4 Steam Delta Heat
Measurements:
Measures actual volume ow and pressure of the saturated steam in the supply piping
as well as the temperature of the condensate in the downstream piping of a heat exchanger.
Calculations:
• Calculates density, mass ow as well as the delta heat between the saturated steam
(supply) and condensation (return) using physical characteristic tables of steam and
water stored in the ow computer.
• With square law device measurement the actual volume is calculated from the differential pressure, taking into account temperature and pressure compensation.
• The saturated steam temperature in the supply line is calculated from the pressure measured there.
Input Variables:
Supply: Flow and pressure (saturated steam) Return: Temperature (condensate)
Output Results:
• Display Results
Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total,
Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak
Demand, Demand Last Hour
• Pulse Output
Heat, Mass or Volume Total
• Relay Outputs
Heat, Mass or Volume Flow Rate , Total, Pressure, Temperature Alarms, Peak
Demand, Demand Last Hour
Steam Delta Heat Illustration
Calculations
Applications:
Calculate the saturated steam mass ow and the heat extracted by a heat exchanger
taking into account the thermal energy remaining in the condensate.
Delta Heat Flow
Net Heat Flow = Volume ow • density (p) • [ED (p)– EW (T)]
ED = Specic enthalpy of steam Ew = Specic enthalpy of water
Note: Assumes a closed system.
14
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
CORRECTED GAS VOLUME
3.5 Corrected Gas Volume
Measurements:
A owmeter measures the actual volume ow in a gas line. Temperature and pressure
sensors are installed to correct for gas expansion effects.
Calculations:
• Corrected Volume is calculated using the ow, temperature and pressure inputs as well as the gas characteristics stored in the ow computer (see "FLUID DATA" submenu). Use the "OTHER INPUT" submenu to dene reference temperature and reference
pressure values for standard conditions.
Output Results:
• Display Results
Corrected Volume or Actual Volume Flow Rate, Resettable Total, Non-Resettable
Total, Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Corrected Volume or Actual Volume Flow Rate, Temperature, Pressure, Density,
Peak Demand, Demand Last Hour
• Pulse Output
Corrected Volume or Actual Volume Total
• Relay Outputs
Corrected Volume or Actual Volume Flow Rate, Total, pressure, Temperature
Alarms, Peak Demand, Demand Last Hour
Applications:
Monitoring corrected volume ow and total of any gas. Flow alarms are provided via relays
and datalogging is available via analog (4-20mA) and serial outputs.
Corrected Gas Volume Illustration
Calculations
Volume Flow
Pulse Input; Average K-Factor
input frequency • time scale factor Volume Flow = K-Factor
Analog Input; Linear
Volume Flow = % input • Full Scale Flow
Corrected Volume Flow
P T Corrected Volume Flow = Volume Flow • • • P
T Z
ref
Z
ref
15
ref
ES749 Flow Computer
Temperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
Orifice Plate
with DP Transmitter
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
GAS MASS
3.6 Gas Mass
Measurements:
A owmeter measures the actual volume ow in a gas line. Temperature and pressure
sensors are installed to measure temperature and pressure.
Calculations:
• Density and mass ow are calculated using gas characteristics stored in the ow
computer.
• With square law device measurement the actual volume is calculated from the differential pressure, taking into account temperature and pressure compensation.
Output Results:
• Display Results
Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total, Temperature,
Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak Demand,
Demand Last Hour
• Pulse Output
Mass or Volume Total
• Relay Outputs
Mass or Volume Flow Rate, Total, Pressure, Temperature, Density Alarms, Peak
Demand, Demand Last Hour
Applications:
Monitoring mass ow and total of gas. Flow alarms are provided via relays and datalogging
is available via analog (4-20mA) and serial outputs.
Gas Mass Illustration
Calculations
Mass Flow
P T Mass Flow = Actual Volume Flow • ρ P
ρ
= Reference density
ref
T
= Reference temperature
ref
P
= Reference pressure
ref
Z
= Reference Z-factor
ref
• • •
ref
T Z
ref
Z
ref
ref
16
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Pressure
Transmitter
GAS COMBUSTION HEAT
3.7 Gas Combustion Heat
Measurements:
A owmeter measures the actual volume ow in a gas line. Temperature and pressure
sensors are installed to measure temperature and pressure.
Calculations:
• Density, mass ow and combustion heat are calculated using gas characteristics stored in the ow computer.
• With square law device measurement the actual volume is calculated from the differential pressure, taking into account temperature and pressure compensation.
Output Results:
• Display Results
Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total,
Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak
Demand, Demand Last Hour
• Pulse Output
Heat, Mass or Volume Total
• Relay Outputs
Heat, Mass or Volume Flow Rate, Total, Pressure, Temperature Alarms, Peak
Demand, Demand Last Hour
Applications:
Calculate the energy released by combustion of gaseous fuels.
Gas Combustion Heat
Calculations
Combustion Heat Flow
P T Combustion Energy = C • ρ P
• Q • • •
ref
T Z
ref
C = Specic combustion heat
ρ
= Reference density
ref
Q = Volume ow
Z
ref
ref
17
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Optional
Pressure
Transmitter
Corrected Liquid Volume
Corrected Liquid Volume Illustration
3.8 Corrected Liquid Volume
Measurements:
A owmeter measures the actual volume ow in a liquid line. A temperature sensor is
installed to correct for liquid thermal expansion. A pressure sensor can be installed to monitor pressure. Pressure measurement does not affect the calculation.
Calculations:
• Corrected Volume is calculated using the ow and temperature inputs as well as the thermal expansion coefcient stored in the ow computer (see "FLUID DATA" submenu). Use the "OTHER INPUT" submenu to dene reference temperature and
density values for standard conditions.
Output Results:
• Display Results
Corrected Volume and Actual Volume Flow Rate, Resettable Total, Non-
Resettable Total, Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Corrected Volume and Actual Volume Flow Rate, Temperature, Pressure,
Density, Peak Demand, Demand Last Hour
• Pulse Output
Corrected Volume and Actual Volume Total
• Relay Outputs
Corrected Volume and Actual Volume Flow Rate , Total, Pressure, Temperature
Alarms, Peak Demand, Demand Last Hour
Applications:
Monitoring corrected volume ow and total of any liquid. Flow alarms are provided via
relays and datalogging is available via analog (4-20mA) and serial outputs.
Calculations
Volume Flow
Pulse Input; Average K-Factor
input frequency • time scale factor Volume Flow = K-Factor
Analog Input; Linear
Volume Flow = % input • Full Scale Flow
Corrected Volume Flow
Corrected Volume Flow = vol. ow • (1 - α • (Tf-Tref))
α = Thermal expansion coefcient • 10
-6
18
2
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Optional
Pressure
Transmitter
Liquid Mass
3.9 Liquid Mass
Measurements:
Actual volume ow is measured by the ow element (DP transmitter, Flowmeter).
Temperature is measured by the temperature transmitter. A pressure transmitter can be used to monitor pressure. Pressure measurement does not affect the calculation. A density transmitter may be used in place of a temperature transmitter for direct density measurement.
Calculations:
• The density and mass ow are calculated using the reference density and the thermal expansion coefcient of the liquid (see "FLUID DATA" submenu)
Output Results:
• Display Results
Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total, Temperature,
Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak Demand,
Demand Last Hour
• Pulse Output
Mass or Volume Total
• Relay Outputs
Mass or Volume Flow Rate, Total, Temperature, Pressure, Density Alarms, Peak
Demand, Demand Last Hour
Applications:
Monitoring mass ow and total of any liquid. Flow alarms are provided via relays and
datalogging is available via analog (4-20mA) and serial outputs.
Liquid Mass Illustration
Calculations
NOTE:
A density transmitter may be used for direct density measurement.
T
1
Volume Flow
As calculated in section 3.8
Mass Flow
Mass Flow = volume ow • (1-a • (T1-T
α = Thermal expansion coefcient • 10
-6
))2 • ref. density
ref
19
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Optional
Pressure
Transmitter
LIQUID COMBUSTION HEAT
3.10 Liquid Combustion Heat
Measurements:
Actual volume ow is measured by the ow element (DP transmitter, Flowmeter).
Temperature is measured by the temperature transmitter. A pressure transmitter can be used to monitor pressure. Pressure measurement does not affect the calculation.
Calculations:
• The density, mass ow and combustion heat are calculated using the uid characteristics stored in the ow computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Combustion Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable
Total, Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Combustion Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density,
Peak Demand, Demand Last Hour
• Pulse Output
Combustion Heat, Mass or Volume Total
• Relay Outputs
Combustion Heat, Mass or Volume Flow Rate, Total, Temperature, Pressure
Alarms, Peak Demand, Demand Last Hour
Applications:
Calculate the energy released by combustion of liquid fuels
Liquid Combustion Heat Illustration
Calculations
Volume Flow
As calculated in section 3.8
Heat Flow
Heat Flow = C • volume ow • (1-α • (T1-T
α = Thermal expansion coefcient • 10
C = Specic combustion heat
T
1
))2 • ref. density
ref
-6
20
ES749 Flow Computer
FlowmeterTemperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
Optional
Pressure
Transmitter
LIQUID SENSIBLE HEAT
3.11 Liquid Sensible Heat
Measurements:
Actual volume ow is measured by the ow element (DP transmitter, Flowmeter).
Temperature is measured by the temperature transmitter. A pressure transmitter can be used to monitor pressure. Pressure measurement does not affect the calculation.
Calculations:
• The density, mass ow and sensible heat are calculated using the uid characteristics stored in the ow computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Sensible Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable
Total, Temperature, Pressure, Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Sensible Heat, Mass or Volume Flow Rate, Temperature, Pressure, Density,
Peak Demand, Demand Last Hour
• Pulse Output
Sensible Heat, Mass or Volume Total
• Relay Outputs
Sensible Heat, Mass or Volume Flow Rate, Total, Temperature, Pressure Alarms,
Peak Demand, Demand Last Hour
Applications:
Calculate the energy stored in a condensate with respect to water at 32°F (0°C).
Liquid Sensible Heat Illustration
Calculations
T
1
Volume Flow
As calculated in section 3.8
Heat Flow
Heat Flow = C • volume ow • (1-α • (T1-T
α = Thermal expansion coefcient • 10
-6
C = Specic heat
))2 • ref. density • (T1 - 32)
ref
21
ES749 Flow Computer
Flowmeter
T2
Temperature
Transmitter
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28DENS
9
T1
Temperature
Transmitter
Water
LIQUID DELTA HEAT
3.12 Liquid Delta Heat
Measurements:
Actual volume ow is measured by the ow element (DP transmitter, Flowmeter).
Temperature of the supply and return lines are measured by the temperature transmitters.
Calculations:
• The density, mass ow and delta heat are calculated using values of the heat carrying liquid stored in the ow computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Heat, Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total,
Temperature1, Temperature2, Delta Temperature, Density, (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Heat, Mass or Volume Flow Rate, Temperature1, Temperature2, Delta
Temperature, Density, Peak Demand, Demand Last Hour
• Pulse Output
Heat, Mass or Volume Total
• Relay Outputs
Heat, Mass or Volume Flow Rate, Total, Temperature Alarms, Peak Demand,
Demand Last Hour
Applications:
Calculate the energy which is extracted by a heat exchanger from heat carrying liquids.
Liquid Delta Heat Illustration
Meter Location = COLD
Calculations
Hot
Cold
Water
Heat = Volume Flow • ρ(T1) • [h(T2) – h(T1)]
Other heat carrying liquids
Heat = C • volume ow • (1-α • (T1-T
WHERE: Delta T > Low Delta T Cutoff
α = Thermal expansion coefcient • 10 C = Mean specic heat
ρ(T1) = Density of water at temperature T
h(T1) = Specic enthalpy of water at temperature T h(T2) = Specic enthalpy of water at temperature T
ρ
= Reference density
ref
T
= Reference temperature
ref
ref
1
))2 • ρ
-6
• (T2 - T1)
ref
1
2
22
ES749 Flow Computer
STEAM – CONDENSATE ENERGY METER
3.13 Steam – Condensate Heat
Measurements:
Actual condensate volume ow is measured by the ow element (DP transmitter,
Flowmeter). Condensate temperature is measured by the temperature transmitter. A pressure transmitter is used to monitor steam pressure.
Calculations:
• The condensate density, volume ow, mass ow and saturated steam energy ­condensate energy are calculated using the uid characteristics stored in the ow
computer. (see "FLUID DATA" submenu)
Output Results:
• Display Results
Steam – Condensate Heat, Condensate Mass and Volume Flow Rate, Resettable
Total, Non-Resettable Total, Temperature, Pressure, Condensate Density (optional: peak demand, demand last hour, time/date stamp)
• Analog Output
Net Heat Flow, Mass and Volume Flow Rate, Condensate Temperature, Steam
Pressure, Condensate Density, Peak Demand, Demand Last Hour
• Pulse Output
Net Heat, Mass or Volume Total
• Relay Outputs
Net Heat, Mass or Volume Flow Rate, Total, Condensate Temperature, Steam
Pressure Alarms, Peak Demand, Demand Last Hour
Applications:
Calculate the energy stored in steam – the energy in returned condensate water.
Steam – Condensate Heat Illustration
Calculations
Pressure
Transmitter
Steam
PRINT
TEMP
PRE 1
RATE
TOTAL
2
1
GRAND6SCROLL7PRE 28DENS
Temperature
Transmitter
T
1
3
Flowmeter
CLEAR•MENU
5
4
TIME
0
9
–
Volume Flow
As calculated in section 3.8
Net Heat Flow
HELP
Saturated Steam
ENTER
Water
Condensate
Net Heat Flow = condensate volume ow • condensate density • [enthalpy steam (Pf) – enthalpy water (Tf)]
23
4. WIRING
4.1 Terminal Designations
Two Relay Terminations Three Relay Option Terminations
1 2
3 4 5
6 7 8 9
10 11 12 13
14 15 16
DC OUTPUT PULSE IN
- - - - - - - - - ­COMMON RTD EXCIT (+) RTD SENS (+)
RTD SENS (-)
DC OUTPUT RTD EXCIT (+)
RTD SENS (+) RTD SENS (-)
PULSE OUTPUT (+) PULSE OUTPUT (-) ANALOG OUTPUT 1 (+) ANALOG OUTPUT 2 (+)
ANALOG OUTPUT COMMON (-)
Vin (+) Iin (+)
TEMPERATURE
Iin (+)
Iin (+)
FLOW
*
IN
IN
**
PRESSURE
(TEMP 2)
IN
ES749 Flow Computer
1
DC OUTPUT
2
PULSE IN
- - - - - - - - - -
3 4
COMMON
5
RTD EXCIT (+) RTD SENS (+)
6
RTD SENS (-)
7
DC OUTPUT
8 9
RTD EXCIT (+) RTD SENS (+)
10
RTD SENS (-)
11
PULSE OUTPUT (+)
12 13
PULSE OUTPUT (-) ANALOG OUTPUT 1 (+)
14 15
ANALOG OUTPUT 2 (+)
16
ANALOG OUTPUT COMMON (-)
Vin (+) Iin (+)
TEMPERATURE
Iin (+)
Iin (+)
FLOW
*
IN
IN
**
PRESSURE
(TEMP 2)
IN
17 NO 18 COM
NC
19
NC
20
COM
21
NO
22
23
AC LINE AC LINE24
RLY1
RLY2
DC (+) DC (-)
POWER IN
17 N.O. 18 COM. 19
20 21 22
23
RLY1 RLY1 RLY3
N.O.
RLY3COM.
RLY2
N.O.
RLY2COM.
AC LINE AC LINE24
*In stacked DP mode, terminal 2 is used for Iin (+) DP Hi Range.
Terminal 3 is used for Iin (+) DP Lo Range.
** In trap monitor mode, terminal 7 is used for Iin (+) from trap monitor.
DC (+) DC (-)
POWER IN
24
4.2 Typical Wiring Connections:
+
–
+
–
Mag 10 mV
–
Pulse 3-30 V
–
+
Analog 4-20 mA Transmitter
(i.e. DP Transmitter)
Analog Voltage Transmitter
(i.e. Turbine Flowmeter
with F/V Converter)
10 mV or 100 mV Signal
(i.e. Turbine Flowmeter
with Magnetic Pickup)
3-30 VDC Pulses
(i.e. Positive Displacement
Flowmeter)
0-5 VDC
4-20 mA
1 2 3 4
1 2 3 4
1 2 3
(+) 24 V Out
4-20 mA In
(+) V In
Common
Pulse In
Common
(+) 24 V Out Pulse In
Common
1 2 3 4
+
–
High Range
DP Transmitter
4-20 mA
+
–
Low Range
DP Transmitter
4-20 mA
(+) 24 V Out 4-20 mA In (DP Hi Range) 4-20 mA In (DP Lo Range)
1 2 3
4.2.1 Flow Input
ES749 Flow Computer
4.2.2 Stacked DP Input
4.2.3 Pressure Input
25
4.2.4 Temperature Input
ES749 Flow Computer
*
* Or optional steam trap monitoring input in some saturated
steam applications.
4.2.5 Temperature 2 Input
26
4.3 Wiring In Hazardous Areas
Examples using MTL787S+ Barrier (MTL4755ac for RTD)
4.3.1 Flow Input Hazardous Area Safe Area
ES749 Flow Computer
DP Transmitter
4.3.2 Pressure Input Hazardous Area Safe Area
4-20mA Pressure Trans-
mitter
24V Out
4-20mA In Common
Common 24V Out
4-20mA In
4.3.3 Temperature Input Hazardous Area Safe Area
4-20mA Temperature
Transmitter
MTL4755ac
3-Wire RTD
27
Common
4-20mA In 24V Out
Common RTD Excit (+) RTD Sens (+) RTD Sens (–)
5. UNIT OPERATION
5.1 Front Panel Operation Concept for Operate Mode
ES749 Flow Computer
How To Use On-Line Help
How To View Process Values
How To Clear The Totalizer
How To Clear The Grand Total
How To Enter Alarm Setpoints
HELP
On-line help is provided to assist the operator in using this product. The help is available during OPERATE and SETUP modes simply by pressing the HELP key. The HELP key is used to enter decimals when entering numeric values.
VIEWING PROCESS VALUES
In the OPERATE mode, several keys have a special, direct access feature, to display an item of interest (i.e. RATE, TOTAL, ALARM SETPOINT, etc.). Press the key to view your choice. Press the ∆ ∇ keys to view other items in that group.
CLEARING TOTALIZER
To clear the totalizers, you must press the TOTAL Function Key to select the totalizer group. Press the ∆ ∇ keys to select the desired totalizer. Once the desired totalizer is displayed, press the CLEAR key to reset the total. The operator will be prompted to verify this action and to enter a password if the unit is locked.
CLEARING GRAND TOTAL
To clear the grand totalizers, you must press the GRAND Function Key and use the ∆ ∇ keys to select the desired grand total. Once the grand total is selected, press the CLEAR key to reset the grand total. The operator will be prompted to verify this action and to enter service password if the unit is locked.
ALARM SETPOINT KEYS
ALARM 1 & ALARM 2 keys are used to view and/or change the alarm setpoints. To view the setpoints, simply press the desired Alarm setpoint key once. Rapidly press the alarm setpoint keys several times for direct editing of the alarm setpoints. The operator will be prompted to enter password if the unit is locked. Press CLEAR, "###", ENTER to enter value.
How To Activate The Scrolling Display List
How To Use The Print Key
How To Use The Menu Key
How To Acknowledge Alarms
SCROLL
Press the Scroll key to activate the scrolling display list. See section 6 to setup the display list.
PRINT
The PRINT key is used to print on demand when the communication port is set for printer.
When the PRINT key is pressed, a user dened list of data (TOTAL, RATE, ALARM
SETPOINT, etc.) is sent to the RS-232 port. A timed message of "PRINTING" will be displayed to acknowledge the print request.
MENU KEY
The MENU key is used to view/enter the Instrument Setup and Service Mode. Press the MENU key to access the Setup and Service modes. (See section 6 for Setup mode). The MENU key is also used for a "Pop-Back" function. When the MENU key is pressed, the display will "Pop-Back" to the current submenu heading. Multiple MENU key depressions will return the unit to the Operate Mode.
ACKNOWLEDGING ALARMS
Most alarm messages are self-clearing. Press the ENTER key to acknowledge and clear latching alarms.
NOTE: Some keys and functions are password protected. Enter the password to gain
access. The passwords are factory set as follows:
Private = 1000, Service = 2000
28
ES749 Flow Computer
General Operation
Password Protection
Relay Operation
5.2 General Operation
This instrument is used primarily to monitor owrate and accumulated total. The inputs can be software congured for a variety of owmeter, temperature and pressure sensors.
The standard output types include: Pulse, Relay, Analog and RS-232 The unit can display
the owrate, total and process variables. RS-485 is an available option for a second
communication channel.
5.3 Password Protection
After an Private and/or Service Code is entered in the "System Parameters" Submenu Group. (see section 6.3, Private Code and Service Code sub-menus), the unit will be locked. The unit will prompt the user for the password when trying to perform the following functions:
Clear Totals Clear Grand Totals (service code required) Edit a Setup Menu Item Edit Alarm Setpoints (ALARM 1 & ALARM 2 Keys)
The Service Code should be reserved for service technicians. The Service Code will allow access to restricted areas of the Service and Test menus. Changes in these areas may result in lost calibration information.
5.4 Relay Operation
Two relay alarm outputs are standard. The relays may also be used for pulse outputs. The relays can be assigned to trip according to various rate, total, temperature or pressure readings. The relays can be programmed for low/high alarms, latch or unlatch, or as relay pulse outputs. ALARM SETPOINT 1 (RLY1) and ALARM SETPOINT 2 (RLY2) are easily accessible by pressing the ALARM 1 or ALARM 2 key on the front panel.
Pulse Output
Analog Outputs
Function Keys Display Grouping
5.5 Pulse Output
The isolated pulse output is menu assignable to any of the available totals. The pulse output duration and scaling can be set by the user. The pulse output is ideal for connecting to remote totalizers or other devices such as a PLC. See section 1.2 for electrical
specications.
5.6 Analog Outputs
The analog outputs are menu assignable to correspond to any of the process parameters. The outputs are menu selectable for 0-20 mA or 4-20 mA. The analog outputs are ideal for "trend" tracking using strip chart recorders or other devices.
5.7 Function Keys; Display Grouping
TOTAL Press the keys to view HEAT TOTAL, MASS TOTAL, CORRECTED
VOLUME TOTAL, VOLUME TOTAL
GRAND TOTAL Press the keys to view GRAND HEAT, GRAND MASS, GRAND
CORRECTED VOLUME, GRAND VOLUME
RATE Press the keys to view HEAT, MASS , CORRECTED VOLUME,
VOLUME, PEAK DEMAND, DEMAND LAST HOUR
TEMPERATURE Press the keys to view TEMPERATURE 1, TEMPERATURE 2, DELTA
TEMPERATURE, DENSITY
PRESSURE Press the keys to view PRESSURE, DIFFERENTIAL PRESSURE, , Y1,
SPECIFIC ENTHALPY
TIME Press the keys to view TIME/DATE, PEAK TIME/DATE, ACCUMULATIVE
POWER LOSS TIME, TIME OF LAST POWER OUTAGE, TIME POWER WAS
LAST RESTORED
29
ES749 Flow Computer
RS-232 Serial Port Operation
PC Communications
RS-232 Serial Port Operation of RS-232 Serial Port with Printers
5.8 RS-232 Serial Port Operation
The RS-232 serial port can be used for programming (using the Setup Disk) or for communicating to printers and computers in the Operating Mode (Run Mode). Enhanced uses include remote metering by modem.
5.8.1 PC Communications:
The Setup Disk also allows the user to query the unit for operating status such as Flow Rate, Flow Total, Temperature, Pressure, Alarm Setpoints, etc. In this mode of operation the RS232 port is assumed connected to a computer. The ES749 will act as a slave and answer requests from the PC. See the Universal Protocol Users Manual for a complete listing of the commands set supported. A DDE/OPC Server is also available for use in exchanging information with DDE Clients such as Spread Sheets, Database Programs, and HMI software.
5.8.2 Operation of RS-232 Serial Port with Printers:
Transaction Printing
For transaction printing, the user denes the items to be included in the printed document
(see section 6.13 COMMUNICATION, Print List). The transaction document can be initiated by pressing the PRINT key.
Data Logging The user can select when (time of day) or how often (print interval) the data log is to be made (see section 6.13 COMMUNICATION, Print Initiate). Information will be stored to the datalogger and optionally output to the RS-232 port.
System Setup and Maintenance Report The system setup and maintenance report lists all of the instrument setup parameters and
usage for the current instrument conguration. The audit trail information and a status
report is also printed. This report is initiated in the Service and Analysis Group (see section 6.15 SERVICE & ANALYSIS, Print System Setup).
Operation of RS-232 Serial Port with Modems
RS-485 Serial Port Operation
Pause Computations Prompt
5.8.3 Operation of RS-232 Serial Port with Modems
In this mode of operation the RS232 port is assumed to be connected to a MPP2400N or similar telephone modem. The ES749 is responsible for communicating to a remote computer through the modem to perform such actions as: Answer incoming calls, process requests for information or action items or data log contents or change setup parameters, call out daily readings to designed phone number, call out to designated phone number in the case of a designated exception or malfunction in the unit, terminating telephone calls if a connection is lost.
5.9 RS-485 Serial Port Operation
The RS-485 serial port is intended to permit operation of the ow computer in a RS-485
network. Access is limited to reading process variables, totalizers, error logs and to executing action routines such as clearing totalizers, alarms, and changing setpoints.
5.10 Pause Computations Prompt
The user will be prompted with a "Pause Computations" message when making signicant
setup changes to the instrument. Pausing computations is necessary to make any
signicant changes. With computations paused, all outputs assume a safe state equal
to that of an unpowered unit. Computations resume when exiting the setup menu.
30
ES749 Flow Computer
PRINT
5
0
–
TIME
CLEAR•MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND6SCROLL7PRE 28PRES
9
6. PROGRAMMING
6.1 Front Panel Operation Concept for Program Mode
The ES749 is fully programmable through the front panel. The instrument setup menu structure is based on a number of topical submenu groups with one submenu group for each instrument function. Each submenu contains all of the individual settings associated with that function. During the instrument setup, setup topics are shown on the bottom line of the display while the detailed selection options are shown on the top line. A help menu is available for each menu item. Please review the following key usage summary before attempting to setup the instrument.
CAUTION: When the computations are paused the instrument outputs will go to a
safe state which is the same as if the unit lost power. All calculations stop.
Menu Key
Up & Down Arrow Keys
Help Key
Numeric Entry Keys
Key Usage Summary:
MENU KEY
Pressing the MENU key while in the "HOME" position will select the view setup parameters mode. Thereafter, the MENU key is used to "pop up" one menu level (i.e. return to the start of the submenu group). The unit will "pop up" one level for each time the MENU key is pressed until nally returning to the "HOME" position of
showing the "scroll" display list.
UP & DOWN ARROW KEYS
Use the UP and DOWN arrow keys to navigate through the submenu groups. The up and down arrow keys are also used to view the next/previous selection in a selection list within a submenu cell. When entering text characters, the UP and DOWN arrow keys are used to scroll through the available character sets for each individual character location. Press the ENTER key to accept the character and advance to the next character.
HELP KEY
On-line help is available to assist the user during instrument setup. A quick help is provided at each setup step. Press the HELP key to display a help message for the current setup selection. This key is also used to enter decimals during numeric entry sequences.
NUMERIC ENTRY KEYS
The keys labeled "0 - 9", "–", ".", CLEAR and ENTER are used to enter numerical values. A leading 0 will assume that you intend to enter a minus "–" sign. The standard numeric entry sequence is: CLEAR, "###", ENTER.Numeric entry values are bounded or clamped by minimum and maximum permitted values.
Clear Key
Enter Key
CLEAR KEY
The CLEAR key is used to clear numeric values to "0".
ENTER KEY
The ENTER key is used to accept the current value and advance to the next selection (Successfully terminate the current numeric entry sequence).
31
ES749 Flow Computer
6.2 EZ SETUP
EZ SETUP
EZ Setup Example: Steam Mass Vortex Flowmeter
EZ SETUP
The EZ Setup routine is a quick and easy way to congure the most commonly used instrument functions. We recommend rst completing the EZ Setup routine for the ow equation and meter
type for your initial application. The setup can then be customized using the complete submenu groups described later in this chapter.
Caution:
Entering the EZ Setup mode automatically sets many
features to a default value (without prompting the user). This may cause any previously programmed information to be lost or reset.
Selection:
YES, NO
Display: EZ SETUP? YES PAUSE COMPUTATIONS
Note:
The "Pause Computations" warning message informs the
user that all computations are halted while programming EZ Setup.
UNITS
FLOW EQUATION
Select the desired units of measure.
Selection:
METRIC, ENGLISH
Display: ENGLISH UNITS?
Select the ow equation appropriate for your application.
Selection:
STEAM MASS, STEAM HEAT, STEAM NET HEAT, STEAM
DELTA HEAT, GAS CORRECTED VOLUME, GAS MASS, GAS COMBUSTION HEAT, LIQ.CORRECTED VOLUME, LIQUID MASS, LIQ. COMBUSTION HEAT, LIQUID SENSIBLE HEAT, LIQUID DELTA HEAT,
STM – CONDENSATE HEAT
Display: STEAM MASS FLOW EQUATION
32
ES749 Flow Computer
6.2 EZ SETUP
(Continued)
Fluid Type
FLOWMETER TYPE
INPUT SIGNAL
EZ SETUP
Select the type of uid appropriate for your application.
Selection:
SATURATED STEAM, SUPERHEATED STEAM
Display: SATURATED STEAM FLUID TYPE
Select the owmeter type used in your application.
Selection:
LINEAR, SQR LAW, SQR LAW-LIN., LINEAR 16 PT, SQR
LAW 16 PT, SQR LAW-LIN. 16 PT, LINEAR UVC, GILFLO, GILFLO 16 PT, BYPASS, ILVA16PT, MASS FLOW
Display: LINEAR FLOWMETER TYPE
Select the appropriate input signal.
K-FACTOR
INPUT SIGNAL
(PRESSURE)
Selection:
4-20 mA, 0-20 mA, 0-5 Vdc, 1-5 Vdc, 0-10 Vdc, DIGITAL:
10 mV LEVEL, DIGITAL: 100 mV LEVEL, DIGITAL: 2.5 V LEVEL, 4-20mA STACKED, 0-20mA STACKED, 4-20mA LINEAR MANIFOLD, 0-20mA LINEAR MANIFOLD
Display: DIGITAL 2.5 V LEVEL INPUT SIGNAL
Enter the K-Factor for the owmeter.
Input:
Number with oating decimal point:
0.0001...999999
Display: 123.67 P/ft3 K-FACTOR
Select the appropriate pressure input signal.
Selection:
MANUAL PRESSURE, 4-20 PRESSURE (ABS.), 0-
20 PRESSURE (ABS.), 4-20 PRESSURE (G), 0-20 PRESSURE (G)
Display: 4-20 PRESSURE (ABS.) INPUT SIGNAL
33
ES749 Flow Computer
6.2 EZ SETUP
(Continued)
FULL SCALE VALUE
(PRESSURE)
DEFAULT VALUE
(PRESSURE)
EZ SETUP
Enter the full scale value for the pressure input signal.
Input:
Number with xed decimal point:
000.000 ... 999.999
Display: 580.000 psia FULL SCALE VALUE
Enter the default value for the pressure input signal.
Input:
Number with xed decimal point:
000.000 ... 999.999
Display: 14.696 psia DEFAULT VALUE
NOTE: After the last entry has been saved, the display
automatically returns to the HOME position. The “EZ
Setup” routine is completed and the ow computations are
resumed.
6.3 DETAILED MENU DESCRIPTION
DETAILED MENU DESCRIPTION
The menu organization for the unit is depicted in Appendix B. The rst
depiction is that available with the operator password. The second is that available with supervisor password.
Please reference Appendix B while reviewing the detailed descriptions for each menu location in the following sections.
34
ES749 Flow Computer
6.4 SYSTEM PARAMETERS
EZ SETUP
SYSTEM PARAMETERS
The EZ Setup routine is a quick and easy way to
congure the most commonly used instrument functions.
Reference: Refer to Section 6.2 for EZ Setup Programming.
Caution:
Entering the EZ Setup mode automatically sets
many features to default values without informing the user. This may cause any previously programmed information to be lost or reset
Selection:
YES, NO
Display: EZ SETUP? NO PAUSE COMPUTATIONS
ACCESS CODE
Note:
The "Pause Computations" warning message
informs the user that all computations are halted while programming EZ Setup.
This is the menu location where the operator can unlock
the unit by entering the correct password (operator or supervisor code), or lock the unit by entering the incorrect password.
Selection:
0 - 9999
Display: 0 ACCESS CODE
35
ES749 Flow Computer
6.4 SYSTEM PARAMETERS
(Continued)
FLOW EQUATION
SYSTEM PARAMETERS
The Flow Equation sets the basic functionality of the unit. Choose the Flow Equation for your particular application.
Note:
Various setup data is only available depending on the ow
equation selected. The ow equation also determines the
assignment of the inputs.
Caution:
Select the ow equation as the rst step. We recommend
using the EZ Setup to select the proper ow equation. The
user can then enter the submenu groups and make additional changes as desired.
Selection:
GAS COMBUSTION HEAT, GAS MASS, GAS CORRECTED
VOLUME, STEAM DELTA HEAT, STEAM NET HEAT, STEAM HEAT, STEAM MASS, LIQUID DELTA HEAT, LIQUID SENSIBLE HEAT, LIQ. COMBUSTION HEAT, LIQUID MASS, LIQ. CORRECTED VOLUME, STM – CONDENSATE HEAT
ENTER DATE
DAYLIGHT SAVINGS TIME
Display: STEAM MASS
FLOW EQUATIONS
Enter the date in this format: Day - Month - Year.
Note:
After prolonged breaks in the power supply (several days)
or upon initial start-up of the unit, the date and time must be reset. This does not apply to units with the datalogger or language option.
Input:
Flashing selections can be changed.
Store and Conrm entries with the ENTER key
Display: 08 FEB 1996 ENTER DATE
The "Daylight Savings" mode allows the unit to automatically adjust the time according to daylight savings time change
Note:
Select "Yes" to enable the Daylight Savings Mode
Selection:
Yes, No
Display: Yes DAYLIGHT SAVINGS
36
ES749 Flow Computer
6.4 SYSTEM PARAMETERS
(Continued)
ENTER TIME
PRIVATE CODE
Special Note:
After returning to the run mode, program editing is automatically locked after 60 seconds as long as no keys are pressed The program editing can also be disabled by entering a number other than the private code at the Access Code prompt.
SYSTEM PARAMETERS
Enter the actual time in this format: Hours - Minutes
Note:
After prolonged breaks in the power supply (several days)
or upon initial start-up of the unit, the date and time must be reset.
Input:
Flashing selections can be changed.
Store and Conrm entries with the ENTER key
Display: 13:24 ENTER TIME
A personal code may be dened. This code is used to enable
program editing.
Note:
• The private code is factory set to 1000
• Entering a private code of "0" will always enable program editing (Turns automatic lock off)
Input:
Maximum 4 digit number: 0...9999
Store and Conrm entries with the ENTER key
Display: 1000 PRIVATE CODE
SERVICE CODE
Note:
The Service Code will allow access to the same infor­mation as the Private Code with the following additional functions:
• Change the Service Code
• Change the Order Code
• Change the Serial No.
• Clear Grand Total
• Clear Errors in Error Log
• View & Perform calibra­tion in Service & Analysis Menu
• Restore Factory Calibra­tion Information in Service & Analysis Menu
• Set Next Calibration Date
• Print Maint.Report
• Perform Service Test
A personal service code may be dened. This code is used to enable
program menus that are normally reserved for factory and service personnel. (i.e.: Service & Analysis Submenu Group)
Note:
• The service code is factory set to 2000
• The service code submenu will only appear if the service code was entered for the "Access Code".
Input:
Maximum 4 digit number: 0...9999
Store and Conrm entries with the ENTER key
Display: 2000 SERVICE CODE
37
ES749 Flow Computer
6.4 SYSTEM PARAMETERS
(Continued)
ENGINEERING CODE
Note:
The Engineering Code will allow access to the same information as the Private Code with the following ad­ditional functions:
• Change the Service Code
• Change the Order Code
• Change the Serial No.
• Clear Grand Total
• Clear Errors in Error Log
• View & Perform calibra­tion in Service & Analysis Menu
• Restore Factory Calibra­tion Information in Service & Analysis Menu
• Set Next Calibration Date
• Print Maint.Report
• Perform Service Test
SYSTEM PARAMETERS
A personal enginerring code may be dened. This code is used to
enable program menus that are normally reserved for engineering personnel. (i.e.: Service & Analysis Submenu Group)
Note:
• The engineering code is factory set to 3000
• The engineering code submenu will only appear if the engineering code was entered for the "Access Code".
Input:
Maximum 4 digit number: 0...9999
Store and Conrm entries with the ENTER key
Display: 3000 SERVICE CODE
TAG NUMBER
A personalized tag can be entered for unit I.D. purposes.
Note:
• Maximum of 10 characters.
• Spaces are considered characters and must be conrmed
by pressing the ENTER key.
Input:
Alphanumeric characters for each of 10 positions
1...9; A...Z;_, <, =, >, ?, etc.
Flashing selections can be changed.
Store and Conrm entries with the ENTER key.
Display: FT101 TAG NUMBER
38
ES749 Flow Computer
6.4 SYSTEM PARAMETERS
(Continued)
ORDER CODE
SERIAL NUMBER
SYSTEM PARAMETERS
The order code (part number) of the unit can be entered. This will help in identifying what options were ordered.
Note:
• The order number is set at the factory and should only be
altered if options are added in the eld by an authorized
service technician.
• Maximum of 10 characters.
Input:
Alphanumeric characters for each of 10 positions
1...9; A...Z;
Flashing selections can be changed.
Store and Conrm entries with the ENTER key
Display: ES749V10P ORDER CODE
The serial number of the unit is assigned at the factory.
SERIAL-NO. SENS.
Note:
Maximum of 10 characters.
Input:
Alphanumeric characters for each of 10 positions
1...9; A...Z;
Display: SN 12345 SERIAL NUMBER
The serial number or tag number of the owmeter can be entered.
Note:
Maximum of 10 characters.
Input:
Alphanumeric characters for each of 10 positions
1...9; A...Z;_, <, =, >, ?, etc.
Flashing selections can be changed.
Store and Conrm entries with the ENTER key.
Display: SN 12345 SERIAL-NO. SENS.
39
ES749 Flow Computer
6.5 DISPLAY
SCROLL LIST
DISPLAY
Select the variable that are to be displayed in the "HOME position" during normal operation. Each variable can be assigned to line 1 (L1), line 2 (L2) or NO (removed from scroll list).
Note:
• To initiate the scroll list press the SCROLL key. The list will be displayed in groups of two, each group is displayed for approximately 3 to 4 seconds.
• Any alarm messages will be displayed periodically, alternating throughout the scroll list.
Selection (with Prompt):
CHANGE? YES, NO ADD TO LIST? L1, L2, NO
Variable Selection:
HEAT FLOW, MASS FLOW, VOLUME FLOW, STD.
VOLUME FLOW, TEMP.1, TEMP.2, DELTA T, PRESSURE, DENSITY, SPEC. ENTHALPY, TIME, DATE, HEAT TOTAL, HEAT GRAND TOTAL, MASS TOTAL, MASS GRAND TOTAL, STD VOLUME TOTAL, STD.V. GRAND TOTAL, VOLUME TOTAL, VOL. GRAND TOTAL, PEAK DEMAND, DEMAND LAST HOUR, PEAK DEMAND TIME, PEAK DEMAND DATE
DISPLAY DAMPING
Note: Variable selection will vary depending on Flow Equation
selected and options supplied.
Display: ADD TO LIST? L1 HEAT FLOW?
The "display damping" constant is used to stabilize uctuating displays. The higher the constant, the less uctuation will be
displayed.
Note: Relay response time is affected by the value entered for
display damping. The larger the display damping value, the slower the relay response time will be. This is intended to prevent false triggering of the relays. Enter a display damping factor of zero (0) for fastest response time.
Note:
• Factory setting: 1
Input:
2 digits max; 0...99
Display: CONSTANT? 1 DISPLAY DAMPING
40
ES749 Flow Computer
6.5 DISPLAY
(Continued)
MAX. DEC. POINT
LANGUAGE
DISPLAY
Enter the number of decimal places for numerical values.
Note:
• The number of decimal places applies to all displayed variables and totalizers.
• The number of decimal places is automatically reduced if
there is insufcient space available on the display for large
numbers.
• The number of decimal places set here does not affect the functions set in the programming setup.
Selection:
0, 1, 2, 3 or 4 (decimal places)
Display: 3 MAX. DEC. POINT
The language can be selected in which all text, parameters and operating messages are to be displayed.
TOTAL ROLL OVER
Note:
• This function is supported by a special capability in the setup diskette.
Selection:
ENGLISH, OTHER
Display: ENGLISH LANGUAGE
Some customer software can not handle very large numbers
(such as 999,999,999) without going to scientic notation (such as
9.9999999E8). This menu can be used to force the totalizers to roll
over at a lower numerical value (such as 999,999).
Input:
Maximum 9 digit number: 0...999999999
Store and Conrm entries with the ENTER key
Display: 999999999 TOTAL ROLL OVER
41
ES749 Flow Computer
6.6 SYSTEM UNITS
TIME BASE
HEAT FLOW UNIT
SYSTEM UNITS
Select "one" unit of time to be used as a reference for all measured or derived and time-dependant process variables and functions such as:
• owrate (volume/time; mass/time)
• heat ow (amount of energy/time) etc.
Selection:
/s (per second), /m (per minute), /h (per hour), /d (per day)
Display: /h TIME BASE
Select the unit for heat ow (amount of energy, combustion heat).
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current.
• Relay setpoints
HEAT TOTAL UNIT
Selection:
kBtu/time base, kW, MJ/time base, kCal/time base, MW,
tons, GJ/h, Mcal/h, Gcal/h, Mbtu/h, Gbtu/h
Display: kBtu/h HEAT FLOW UNIT
Select the unit of heat for the particular totalizer.
Note:
The unit selected here also applies to the following:
• Pulse value for pulse output
• Relay setpoints
Selection:
kBtu, kWh, MJ, kCal, MWh, tonh,GJ, Mcal, Gcal, Mbtu, Gbtu
Display: kBtu HEAT FLOW UNIT
42
ES749 Flow Computer
6.6 SYSTEM UNITS
(Continued)
MASS FLOW UNIT
MASS TOTAL UNIT
SYSTEM UNITS
Select the unit of mass owrate (mass/time base).
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current
• Relay setpoints
Selection:
lbs/time base, kg/time base, g/time base, t/time base, tons(US)/time base, tons(long)/time base
Display: lbs/h MASS FLOW UNIT
Select the unit of mass for the particular totalizer.
Note:
The unit selected here also applies to the following:
• Pulse value for pulse output
• Relay setpoints
Selection:
lbs, kg, g, t, tons(US), tons(long), hlbs, Klbs, Mlbs
Display: lbs MASS TOTAL UNIT
43
ES749 Flow Computer
6.6 SYSTEM UNITS
(Continued)
COR.VOL. FLOW UNIT
SYSTEM UNITS
Select the unit of corrected volumetric owrate
(corrected volume/time base).
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current
• Relay setpoints Corrected Volume = volume measured under operating conditions
converted to volume under reference conditions.
Selection:
The available selections will change depending on the ow equation
selected.
bbl/time base, gal/time base, l/time base, hl/time base, dm3/
time base, ft3/time base, m3/time base, scf/time base, Nm3/ time base, NI/time base, igal/time base, mcf/time base
All units listed above apply to corrected volume.
Display: scf/h COR.VOL. FLOW UNIT
COR. VOLUME TOT. UNIT
Select the unit of volume for the particular totalizer.
Note:
The unit selected here also applies to the following:
• Pulse value for pulse output
• Relay setpoints Corrected Volume = volume measured under operating conditions
converted to volume under reference conditions.
Selection:
The available selections will change depending on the ow equation
selected.
bbl, gal, l, hl, dm3, ft3, m3, scf, Nm3, NI, igal, mcf
All units listed above apply to corrected volume.
Display: scf COR.VOLUME TOT.UNIT
44
ES749 Flow Computer
6.6 SYSTEM UNITS
(Continued)
VOLUME FLOW UNIT
SYSTEM UNITS
Select the unit for volumetric owrate.
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current
• Relay setpoints
Selection:
The available selections will change depending on the ow equation
selected.
bbl/time base, gal/time base, l/time base, hl/time base, dm3/
time base, ft3/time base, m3/time base, acf/time base, igal/ time base
All units listed above apply to the actual volume measured under operating conditions.
Display: ft3/h VOLUME FLOW UNIT
VOLUME TOTAL UNIT
Select the unit for uncorrected volume totalizer.
Note:
The unit selected here also applies to the following:
• Pulse value for pulse output
• Relay setpoints
Selection:
The available selections will change depending on the ow equation
selected.
bbl, gal, l, hl, dm3, ft3, m3, acf, igal
All units listed above apply to the actual volume measured under operating conditions.
Display: ft3 VOLUME TOTAL UNIT
45
ES749 Flow Computer
6.6 SYSTEM UNITS
(Continued)
DEFINITION bbl
TEMPERATURE UNIT
SYSTEM UNITS
In certain countries the ratio of gallons (gal) per barrels (bbl) can vary
according to the uid used and the specic industry. Select one of the following denitions:
• US or imperial gallons
• Ratio gallons/barrel
Selection:.
US: 31.0 gal/bbl for beer (brewing) US: 31.5 gal/bbl for liquids (normal cases) US: 42.0 gal/bbl for oil (petrochemicals)
US: 55.0 gal/bbl for lling tanks
imp: 36.0 gal/bbl for beer (brewing) imp: 42.0 gal/bbl for oil (petrochemicals)
Display: US: 31.0 gal/bbl DEFINITION bbl
Select the unit for the uid temperature.
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current
• Relay setpoints
• Reference conditions
• Specic heat
Selection:
°C (Celsius), °F (Fahrenheit), °K (Kelvin), °R (Rankine)
Display: oF TEMPERATURE UNIT
46
ES749 Flow Computer
6.6 SYSTEM UNITS
(Continued)
PRESSURE UNIT
SYSTEM UNITS
Select the unit for process pressure.
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current
• Relay setpoints
• Reference conditions
Differential pressure is in mbar for Metric selections Differential pressure is in "H2O f or English selections
Selection:
bara, kpaa, kc2a, psia, barg, psig, kpag, kc2g
Denitions:
bara bar kpaa kpa Absolute pressure kc2a kg/cm2 ("a" for absolute) psia psi
DENSITY UNIT
barg bar Gauge pressure compared to kpag kpa atmospheric pressure kc2g kg/cm2 ("g" for gauge) psig psi
Gauge pressure differs from absolute pressure by the
atmospheric pressure, which can be set in the submenu group "OTHER INPUT".
Display: psia PRESSURE UNIT
Select the unit for the density of the uid.
Note:
The unit selected here also applies to the following:
• Zero and full scale value for current
• Relay setpoints
Selection:
kg/m3, kg/dm3, #/gal, #/ft
3
(# = lbs = 0.4536 kg)
Display: #/ft3 DENSITY UNIT
47
ES749 Flow Computer
6.6 SYSTEM UNITS
(Continued)
SPEC. ENTHALPY UNIT
LENGTH UNIT
SYSTEM UNITS
Select the unit for the combustion value (spec. enthalpy).
Note:
The unit selected here also applies to the following:
• Specic thermal capacity
(kWh/kg → kWh/kg - °C)
Selection:
btu/#, kWh/kg, MJ/kg, kCal/kg (# = lbs = 0.4536 kg)
Display: Btu/# SPEC. ENTHALPY UNIT
Select the unit for measurements of length.
Selection:
in, mm
Display: in LENGTH UNIT
48
ES749 Flow Computer
6.7 FLUID DATA
FLUID TYPE
FLUID DATA
Select the uid. There are three types:
1. Steam / Water
All information required for steam and water (such as saturated steam
curve, density and thermal capacity) is permanently stored in the ow
computer.
2. Fluid Displayed
Preset information for other uids (such as air and natural gas) is stored in the ow computer and can directly adopted by the user.
If the preset values need to be changed to t your specic process
conditions, then proceed as follows:
Select the uid (air or natural gas) and press the ENTER key (this
sets all of the preset values). Re-select the submenu group "FLUID TYPE", now choose "GENERIC" and ENTER. Now the preset values for the previously
selected uid can be altered.
3. Generic Fluid
Select the setting "GENERIC" for the Fluid type submenu. The
characteristics of any uid can now be dened by the user.
REF. DENSITY
Selection:
GENERIC, WATER, SATURATED STEAM, SUPERHEATED
STEAM, DRY AIR, HUMID AIR, HUMID GAS, NATURAL GAS, NATURAL GAS (NX-19), HYDROGEN, ARGON, METHANE, NITROGEN, CARBON DIOXIDE, PROPANE, OXYGEN, ETHANE, HELIUM
Display: GENERIC FLUID TYPE
Select the density for a generic uid at reference temperature and
pressure (see "STP REFERENCE" in "OTHER INPUT" submenu group).
Input:
Number with oating decimal point: 0.0001...10000.0
Display: .0760 #/ft3 REF. DENSITY
49
ES749 Flow Computer
6.7 FLUID DATA
(Continued)
THERM. EXP. COEF.
FLUID DATA
Enter the thermal expansion coefcient for a generic liquid. The coefcient is required for the temperature compensation of volume with various ow equations (i.e. Liquid Mass or Corrected Liquid
Volume).
Input:
Number with oating decimal point: 0.000...100000 (e-6)
The thermal expansion coefcient can be calculated as follows:
1 -
c =
c Thermal expansion coefcient
T0,T1 Temperatures at known points (see below) ρ (T0,T1) Density of the liquid at temperature T0 or T
ρ(T1) ρ(T
T
1
o
- T
)
o
+10
6
1
COMBUSTION HEAT
SPECIFIC HEAT
For optimum accuracy, choose the reference temperatures
as follows: T0: midrange temperature T1: choose a second point at or near the maximum process temperature
106 The value entered is internally multiplied by a factor of 10
-6
(display: e-6/temp. unit) since the value to be entered is
very small.
Display: 104.300 (e-6/oF) THERM.EXP.COEF.
Enter the specic combustion heat for generic fuels.
Input:
Number with oating decimal point: 0.000...100000
Display: 1000.000 kBtu/lbs COMBUSTION HEAT
Enter the specic heat capacity for generic uids. This value is
required for calculating the delta heat of liquids.
Input:
Number with oating decimal point: 0.000...10.000
Display: 10.000 kBtu/lbs-°F SPECIFIC HEAT
50
ES749 Flow Computer
6.7 FLUID DATA
(Continued)
FLOW. Z-FACTOR
REF. Z-FACTOR
FLUID DATA
Enter a Z-factor for the gas at operating conditions. The Z-factor indicates how different a "real" gas behaves from an "ideal gas" which exactly obeys the "general gas law" (P x V/T = constant; Z=1). The further the real gas is from its condensation point, the closer the Z-factor approaches "1".
Note:
• The Z-factor is used for all gas equations.
• Enter the Z-factor for the average process conditions (pressure and temperature).
Input:
Number with xed decimal point: 0.1000...10.0000
Display: 1.000 FLOW. Z-FACTOR
Enter a Z-factor for the gas at reference conditions.
Note:
• The Z-factor is used for all gas equations.
• Dene the standard conditions in the submenu "STP
REFERENCE" (OTHER INPUT submenu group).
Input:
ISENTROPIC EXP.
Number with xed decimal point: 0.1000...10.0000
Display: 1.000 REF. Z-FACTOR
Enter the isentropic exponent of the uid. The isentropic exponent describes the behavior of the uid when measuring the ow with a square law owmeter. The isentropic exponent is a uid property dependent on operating
conditions.
Note:
Select one of the "SQR LAW" selections in "FLOWMETER
TYPE" of submenu group "FLOW INPUT" to activate this function.
Input:
Number with xed decimal point: 0.1000...10.0000
Display: 1.4000 ISENTROPIC EXP.
51
ES749 Flow Computer
6.7 FLUID DATA
(Continued)
MOLE % NITROGEN
MOLE % CO
2
FLUID DATA
Enter the Mole % Nitrogen in the anticipated natural gas mixture. This information is needed by the NX-19 computation
Note:
Select "NATURAL GAS (NX-19)" in "FLUID TYPE" to activate
this function.
Input:
Number with xed decimal point: 0.00...15.00
Display: 0.00 MOLE % NITROGEN
Enter the Mole % CO2 in the anticipated natural gas mixture. This information is needed by the NX-19 computation
Note:
Select "NATURAL GAS (NX-19)" in "FLUID TYPE" to
activate this function.
VISCOSITY COEF. A
Input:
Number with xed decimal point: 0.00...15.00
Display: 0.00 MOLE % CO2
Enter the Viscosity coefcient A for the anticipated uid. This
information is needed by the viscosity computation for UVC and for Reynolds Number calculations.
Note:
Select "SQUARE LAW 16PT" or "LINEAR UVC" in
"FLOWMETER TYPE" to activate this function.
Input:
Number with xed decimal point: 0.000000...1000000
Display: 0.000444 VISCOSITY COEF. A
52
ES749 Flow Computer
6.7 FLUID DATA
(Continued)
Computation of Viscosity Coef. A and B
FLUID DATA
VISCOSITY COEF. B
Computation of Viscosity Coef. A and B
The ow computer solves an equation which computes the viscosity as a function of temperature. Two
parameters must be entered for this calculation to be performed. These are the setup parameters Viscosity
Coef. A and Viscosity Coef. B. A table listing these values for common uids is available from the factory. Alternately, if your intended uid is not listed, the Viscosity Coef. A and B can be derived from two known
temperature/viscosity pairs. Begin by obtaining this information for you intended uid. Convert these known
points to units of Degrees F and centipoise (cP)
The information is now in a suitable form to compute the Viscosity Coef. A and Viscosity Coef. B using the
following equation based on the uid state.
For a liquid, A and B are computed as follows:
Enter the Viscosity coefcient B for the anticipated uid. This
information is needed by the viscosity computation for UVC and for Reynolds Number calculations.
Note:
Select "SQUARE LAW 16PT" or "LINEAR UVC" in
"FLOWMETER TYPE" to activate this function.
Input:
Number with xed decimal point: 0.000000...1000000
Display: 0.3850 VISCOSITY COEF. B
B = (T1 + 459.67) • (T2 + 459.67) • ln [ cP1/cP2] (T2 + 459.67) - (T1 + 459.67)
A = cP1 .
exp [ B / ( T1 + 459.67) ]
For a gas, A and B are computed as follows:
B = ln [ cP2 / cP1] .
ln [ (T2 +459.67) / (T1 + 459.67)]
A = cP1 . (T1 + 459.67)B
NOTE: cS = cP . Density (in kg/l)
% RELATIVE HUMIDITY
Enter the % Relative Humidity in the anticipated gas mixture. This information is needed to more accurately compute the density of a Humid gas.
nput:
Number with xed decimal point: 0.000000...100.0000
Display: 0.3850 % RELATIVE HUMIDITY
53
ES749 Flow Computer
6.8 FLOW INPUT
FLOWMETER TYPE
FLOW INPUT
Select the owmeter type. The ow equation (see SYSTEM PARAMETERS) and the owmeter selected here determine the basic operation of the ow computer.
Selection:
LINEAR Volumetric owmeter with linear pulse or analog
output.
SQR LAW Differential pressure transmitter without square root
extraction, with analog output.
SQR LAW-LIN. Differential pressure transmitter with square root
extraction and analog output.
LINEAR 16 PT* Volumetric owmeter with nonlinear pulse or analog
output; with 16 point linearization table.
SQR LAW 16 PT* Differential pressure transmitter without square root extraction, with analog
output and 16 point linearization table.
SQR LAW-LIN. 16 PT* Differential pressure transmitter with square root extraction, analog output
and 16 point linearization table.
LINEAR UVC Volumetric Turbine owmeter with UVC calibration
LINEAR MANIFOLD Linear manifold consists of 2 linear owmeters used in
GILFLO Gilo owmeters are special purpose differential
GILFLO 16PT Gilo 16 PT owmeters are special purpose differential
BYPASS BYPASS is a selection for use with Bypass(Shuntow)
ILVA 16PT ILVA 16 PT owmeters are special purpose differential
MASS FLOW METER Flowmeter type such as Coriolis, or Thermal
curve documentation and pulse output.
conjunction with an external bypass/diverter value. It may be used with turbine, PD, Mag, Vortex owmeters equipped with analog outputs to extend the allowable turndown range.
pressure type owmeters with an analog output where the differential pressure is linear with ow.
pressure type owmeters with an analog output where the differential pressure is approximately linear with ow, but can be further enhanced by a 16 point linearization table.
owmeters equipped with a pulse output.
pressure type owmeters with an analog output where the differential pressure is approximately linear with ow, but can be further enhanced by a 16 point linearization table.
Flowmeter whose output is directly proportional to mass ow. Multivariable transmitters whose output is proportional to a computed mass ow rate can also use this meter type selection.
* A linearization table must be entered by user. (see "LINEARIZATION" submenu).
Display: LINEAR FLOWMETER TYPE
54
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
SQUARE LAW FLOWMETER
ILVA METER SIZE
FLOW INPUT
Select the type of square law owmeter to be used with the instrument.
Note:
This selection will only appear if one of the Square Law
selections were made in "FLOWMETER TYPE".
Selection:
ORIFICE, V-CONE, ANNUBAR, PITOT, VENTURI, FLOW NOZZLE, BASIC SQRLAW/TARGET, WEDGE, VERABAR, ACCELABAR
Display: ORIFICE SQUARE LAW FLOWMETER
Select the size of the ILVA owmeter.
Selection:
DN50, DN80, DN100, DN150, DN200, DN250, DN300
ACCELABAR SIZE
INPUT SIGNAL
Select the size of the Accelabar owmeter.
Selection:
1 inch, 2 inch, 3 inch, 4 inch, 6 inch, 8 inch, 10 inch, 12 inch
Select the type of measuring signal produced by the owmeter.
Selection:
DIGITAL, 10 mV LEVEL Voltage pulses, 10mV
trigger threshold.
DIGITAL, 100 mV LEVEL Voltage pulses, 100mV
trigger threshold.
DIGITAL, 2.5 V LEVEL Voltage pulses, 2.5V trigger
threshold.
4-20 mA 4-20 mA current signal 0-20 mA 0-20 mA current signal 4-20 mA STACKED 4-20 mA current signal 0-20 mA STACKED 0-20 mA current signal
0-5 V 0-5 V voltage signal 1-5 V 1-5 V voltage signal 0-10 V 0-10 V voltage signal
Display: 4-20 mA INPUT SIGNAL
55
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
LOW SCALE
FULL SCALE
FLOW INPUT
Set the low scale value for the analog input signal. The value entered here must be identical to the value set for the
owmeter.
Note:
• For owmeters with analog/linear output, the ow computer uses the selected system units for volumetric owrate.
• The units for differential pressure owmeters are dependent on
the system units selected for pressure:
- Imperial units [inches H2O]
- Metric units: [mbar]
Input:
Number with oating decimal point: 0.000...999999
Display: .000 ft3/h LOW SCALE VALUE
Set the full scale value for the analog input signal. The value entered here must be identical to the value set for the
owmeter.
Note:
• For owmeters with analog/linear output, Target, generic square law and Gilo owmeters, the ow computer uses the selected system units for volumetric owrate.
• The units for differential pressure owmeters are
dependent on the system units selected for pressure:
- Imperial units [inches H2O]
- Metric units: [mbar]
LOW SCALE-HI RANGE
Input:
Number with oating decimal point: 0.000...999999
Display: 10000.00 ft3/h FULL SCALE VALUE
Set the low scale value for the high range transmitter analog input signal. The value entered here must be identical to the value set for the
owmeter.
Note:
• The units for differential pressure owmeters are
dependent on the system units selected for pressure:
- Imperial units [inches H2O]
- Metric units: [mbar]
Input:
Number with oating decimal point: 0.000...999999
Display: .000 ft3/h LOW SCALE-HIGH RANGE
56
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
FULL SCALE-HI RANGE
SWITCH UP DP
FLOW INPUT
ll scale value for the high range transmitter analog input signal. The value entered here must be identical to the value set for the
owmeter.
Note:
• The units for differential pressure owmeters are dependent
on the system units selected for pressure:
- Imperial units [inches H2O]
- Metric units: [mbar]
Input:
Number with oating decimal point: 0.000...999999
Display: 10000.00 ft3/h FULL SCALE VALUE
Enter the value of delta P at which the unit will begin using the hi range delta P pressure transmitter signal.
Input:
SWITCH DOWN DP
LOW FLOW CUTOFF
Number with oating decimal point: 0.000...999999
Display: 0.000 in H2O SWITCH UP DP
Enter the value of delta P at which the unit will begin using the lo range delta P pressure transmitter signal.
Input:
Number with oating decimal point: 0.000...999999
Display: 0.000 in H2O SWITCH UP DP
Enter the low ow cutoff. This is used as a switchpoint for creep suppression. This can be used to prevent low ows from being
registered.
Input:
Number with oating decimal point: 0.000...999999
Display: .000 ft3/h LOW FLOW CUTOFF
57
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
K-FACTOR
INLET PIPE BORE
FLOW INPUT
Enter the K-Factor of the owmeter.
Note:
• The K-Factor is expressed in pulses per unit volume (as
dened by "total units")
Input:
Number with oating decimal point: 0.001...999999
Display: .000 ft3/h LOW FLOW CUTOFF
Enter the inlet pipe diameter or bore for the piping section upstream
of the ow measurement device.
Input:
Number with oating decimal point: 0.001...1000.00
Display: 4.090 in INLET PIPE BORE
ENTER BETA
CAL. DENSITY
Enter the geometric ratio for the square law device being used. This
value is given by the manufacturer of the orice plate, or other square
law device.
Note:
"Beta" is only required for measuring gas or steam with some
square law owmeters.
Input:
Number with xed decimal point: 0.0000...1.0000
Display: 1.0000 ENTER BETA
Enter the calibration density. This is the uid density upon which the owmeter's calibration is based.
Input:
Number with oating decimal point in requested units:
0.000...10.000
Display: 8.3372 (#/gal) CAL. DENSITY
58
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
METER EXP. COEF.
FLOW INPUT
The owmeter pipe expands depending on the temperature of the uid. This affects the calibration of the owmeter.
This submenu allows the user to enter an appropriate correction
factor. This is given by the manufacturer of the owmeter. This factor
converts the changes in the measuring signal per degree variation from calibration temperature. The calibration temperature is entered into the
ow computer to 70 F / 21 °C.
Some manufacturers use a graph or a formula to show the inuence of temperature on the calibration of the owmeter. In this case use the
following equation to calculate the meter expansion coefcient:
K
Q(T) Volumetric ow at temperature T resp. T
T Average process temperature T
Note:
• This correction should be set in either the owmeter or in
• Entering the value "0.000" disables this function
• Value can be calculated from Fa factor
Meter expansion coefcient
ME
Calibration temperature
CAL
the ow computer.
CAL
Input:
Number with oating decimal point:
0.000...999.9 (e-6/°X)
Display: 27.111 (E-6/oF) METER EXP. COEF.
59
ES749 Flow Computer
2 • ∆p •
ME
CAL
√
K
ε
••
(2 • ∆p)
ME
CAL
√
K
•
2 • ∆p •
(1 – KME• (T – T
CAL
))
√
K
ε
••
REF
•
6.8 FLOW INPUT
(Continued)
DP FACTOR
FLOW INPUT
The DP-Factor describes the relationship between the owrate and the measured differential pressure. The owrate is computed according to one of the three following equations, depending on the selected ow
equation:
Steam (or gas) mass ow:
M =
DP
1 – K
Liquid volume ow:
Q =
(1 – K
Gas corrected volume ow:
REF
=
Q
M Mass ow Q Volumetric ow
Q
Corrected volumetric ow
REF
K
DP-Factor
DP
ε1 Gas expansion factor (Y1)
T Operating temperature T
Calibration temperature
CAL
∆p Differential pressure ρ Density at owing conditions
K
Meter expansion coefcient x 10
ME
ρ
Reference density
REF
1
• (T – T
DP
• (T – T
1
DP
ρ
–6
ρ
)
/ρ
))
ρ
60
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
DP FACTOR
(Continued)
FLOW INPUT
The DP-Factor (KDP) can be entered manually or the ow computer can compute it for you. The information necessary for this calculation
can be found on the sizing sheet from a owmeter sizing program.
Note:
The following data must be entered before the ow computer can
compute the DP-Factor.
1. Flow equation see "SYSTEM PARAMETER"
2. Fluid Data see "FLUID DATA"
3. Beta see "FLOW INPUT"
4. Meter expansion coef. ref see "FLOW INPUT"
5. STP Ref. temperature*, pressure see "OTHER INPUT"
7. Inlet Pipe Bore see "FLOW INPUT"
8. Calibration Temp. see "OTHER INPUT"
* only for gas ow equations.
Entries:
CHANGE FACTOR? NO CHANGE FACTOR? YES
If "YES" the ow computer will prompt you further:
COMPUTE FACTOR? NO COMPUTE FACTOR? YES
If "NO": Enter DP FACTOR If "YES": You will be prompted for the following:
ENTER DELTA P ENTER FLOWRATE ENTER DENSITY ENTER TEMPERATURE ENTER INLET PRESSURE ENTER ISENTROPIC EXP
61
ES749 Flow Computer
∆p
27.7 •p
1
R=1–
κ−1
1−β4)•(
κ
•R
2/
κ
•(1-R
(κ−1)/κ
)
[(1 −(β
•
4
R))•(1 -R)]
2/
κ
ε1=
∆p
[]
6.8 FLOW INPUT
(Continued)
DP FACTOR
(Continued)
FLOW INPUT
The ow computer will then compute the gas expansion factor
(ε1), (Y1) using one of the following equation:
Orice Case:
ε1=1–(0.41 +0.35 β4)•
Y =
1
V-Cone, Venturi, Flow Nozzle, Wedge Case:
Y1 =
κ •p1• 27.7
Annubar, Pitot, Target Case;
Y1 = ε1 = 1.0
ε1 Gas expansion factor β BETA (geometric ratio)
∆p Differential pressure
κ Isentropic exponent p1 Inlet pressure (absolute)
NOTE: 27.7 is a units conversion constant from the absolute inlet
pressure units to the differential pressure units. (27.7 is for psia to "H2O, use other units conversions as required.).
62
ES749 Flow Computer
Q
• ρ
• (1 – KME • (T – T
))
Q • (1 – KME • (T – T
CAL
))
2 • ∆p
ρ
K
DP
=
M • (1 – KME • (T – T
))
6.8 FLOW INPUT
(Continued)
DP FACTOR
(Continued)
FLOW INPUT
The DP-Factor (KDP) is then computed using one of the following equations:
Steam:
K
=
DP
ε1 • √2 • ∆p • ρ
Liquid:
Gas:
K
DP
REF
=
REF
ε1 • √2 • ∆p • ρ
K
M Mass ow Q Volumetric ow
Q
ε1 Gas expansion factor
T Operating temperature T
∆p Differential pressure
ρ Density at owing conditions ρ
DP-Factor
DP
Corrected volumetric ow
REF
Calibration temperature
CAL
Reference density
REF
CAL
CAL
LOW PASS FILTER
Note:
The computation accuracy can be enhanced by entering up to 16 values for Reynold's Number DP-Factor in a linearization table (see "LINEARIZATION"). Each DP-Factor can be calculated using the above procedure. For every calculation, a sizing sheet is required. The results have to be entered in the linearization table afterwards.
Enter the maximum possible frequency of a owmeter with a digital output. Using the value entered here, the ow computer selects a suitable limiting frequency for low pass lter to help suppress
interference from higher frequency signals.
Input:
Max. 5 digit number: 10...40000 (Hz):
Display: 40000 Hz LOW PASS FILTER
63
ES749 Flow Computer
Cf =
actual flowrate
displayed flowrate
6.8 FLOW INPUT
(Continued)
LINEARIZATION
FLOW INPUT
With many owmeters, the relationship between the owrate and the
output signal may deviate from an ideal curve (linear or squared).
The ow computer is able to compensate for this documented
deviation using a linearization table. The appearance of the linearization table will vary depending on
particular owmeter selected.
Linear owmeters with pulse output
The linearization table enables up to 16 different frequency & K-factor pairs. The frequency and corresponding K-factor are prompted for each pair of values. Pairs are entered in ascending order by frequency.
Linear Flowmeters with pulse outputs and a UVC Curve:
The linearization table enables up to 16 different Hz/cstks and K-Factor points. The Hz/cstks and corresponding K-Factors are prompted for each pair of values. Pairs are entered in ascending order by Hz/cstks.
Linear owmeters with analog output (excluding Gilo, ILVA)
The linearization table enables up to 16 different owrate & correction factor pairs. The owrate and corresponding correction
factor are prompted for each pair of values. The correction factor (Cf) is determined as follows.
Linear/squared DP transmitters with analog output
The linearization table enables up to 16 different Reynold's Number an DP factor pairs. The Reynold's Number and corresponding DP factor are prompted for each pair of values.
Selection:
CHANGE TABLE? NO CHANGE TABLE? YES
If "YES" the linearization table sequence of prompts will
begin.
Example (for linear owmeters with analog output) Enter ow rate:
FLOW ft3/h 3.60 POINT 0
Entry of corresponding correction factor: COR.FACTOR 1.0000 POINT 0
Note: Enter "0" for the value of a pair (other than point 0) to exit the linearization table routine and use the values stored up to that point.
64
ES749 Flow Computer
6.8 FLOW INPUT
(Continued)
FLOWMETER LOCATION
BYPASS CAL. FACTOR
BYPASS EAm FACTOR
FLOW INPUT
Enter the Flowmeter Location
Selection:
Hot, Cold:
Display: COLD FLOWMETER LOCATION
Enter the Bypass Calibration Factor.
Input:
Max. 6 digit number: 0.000001...999999
Display: 1.000000 BYPASS CAL. FACTOR
Enter the Bypass EAm Factor.
Input:
Max. 6 digit number: 0.000001...999999
BYPASS DC FACTOR
BYPASS Ym FACTOR
VIEW INPUT SIGNAL
Display: 1.000000
BYPASS EAM FACTOR
Enter the Bypass DC Factor.
Input:
Max. 6 digit number: 0.1...10.0
Display: 1.000000 BYPASS DC FACTOR
Enter the Bypass Ym Factor.
Input:
Max. 6 digit number: 0.001...1.0
Display: 1.000000 BYPASS YM FACTOR
This feature is used to see the present value of the ow input signal. The type of electrical signal is determined by the owmeter input
signal type selection.
Display: 150 Hz VIEW INPUT SIGNAL
VIEW HIGH RANGE SIGNAL
This feature is used to see the present value of the high range
ow input signal. The type of electrical signal is determined by the owmeter input signal type selection.
Display: 4 mA VIEW HIGH RANGE SIGNAL
65
ES749 Flow Computer
6.9 OTHER INPUT
SELECT INPUT
INPUT SIGNAL
OTHER INPUT
In addition to the ow input, the ow computer provides two other
inputs for temperature, density and/or pressure signals. In this
submenu, select the particular input which is to be congured in the
following submenus. Input 1 may also be used in conjunction with a steam trap monitor.
Selection:
1 (input 1: Temperature or Steam Trap Monitor) 2 (input 2: Pressure, Temperature 2, Density)
Display: 1 SELECT INPUT
Determine the type of measuring signal produced by the temperature, pressure or density sensor.
Note:
When saturated steam is measured with only a pressure sensor, "INPUT 1 NOT USED" must be selected. If only a temperature sensor is used, "INPUT 2 NOT USED" must be selected.
Selection:
Input 1 (Temperature): INPUT 1 NOT USED, RTD TEMPERATURE, 4-20 TEMPERATURE, 0-20 TEMPERATURE, MANUAL
TEMPERATURE*, 4-20 mA TRAP STATUS
Input 2 (Process pressure, Temperature 2, Density): INPUT 2 NOT USED, 4-20 PRESSURE (G), 0-20 PRESSURE (G), MANUAL PRESSURE*, 4-20 PRESSURE (ABS.), 0-20 PRESSURE (ABS.), RTD TEMPERATURE 2, 4-20 TEMPERATURE 2, 0-20 TEMPERATURE 2, MANUAL TEMPERAT. 2*, 4-20
DENSITY, 0-20 DENSITY, MANUAL DENSITY*
* Select this setting if a user dened xed value for the corresponding
measuring value is required.
Display: 4-20 TEMPERATURE INPUT SIGNAL
66
ES749 Flow Computer
6.9 OTHER INPUT
(Continued)
LOW SCALE VALUE
FULL SCALE VALUE
OTHER INPUT
Set the low scale value for the analog current input signal (value for 0 or 4 mA input current). The value entered here must be identical to the value set in the pressure, temperature or density transmitter.
Input:
Number with xed decimal point: -9999.99...+9999.99
Display: 32.00 of LOW SCALE VALUE
Set the full scale value for the analog current input signal (value for 20 mA input current). The value entered here must be identical to the value set in the pressure, temperature or density transmitter.
Input:
Number with xed decimal point: -9999.99...+9999.99
Display: 752.00 of FULL SCALE VALUE
DEFAULT VALUE
STP REFERENCE
A xed value can be dened for the assigned variable (pressure, temperature, density). The ow computer will use this value in the
following cases:
• In case of error (i.e. defective sensors). The ow computer
will continue to operate using the value entered here.
• if "MANUAL TEMPERATURE", "MANUAL PRESSURE" or "MANUAL DENSITY" was selected for "INPUT SIGNAL".
Input:
Number with xed decimal point: -9999.99...+9999.99
Display: 70.00 of DEFAULT VALUE
Dene the STP reference conditions (standard temperature and
pressure) for the variable assigned to the input. Presently, standard
conditions are dened differently depending on the country and
application.
Input:
Number with xed decimal point:
-9999.99...+9999.99
Display: 60.00 of STP REFERENCE
67
ES749 Flow Computer
6.9 OTHER INPUT
(Continued)
BAROMETRIC PRESS.
CALIBRATION TEMP.
OTHER INPUT
Enter the actual atmospheric pressure. When using gauge pressure transmitters for determining gas pressure, the reduced atmospheric pressure above sea level is then taken into account.
Input:
Number with oating decimal point:
0.0000...10000.0
Display: 1.013 bara BAROMETRIC PRESS.
Enter the temperature at which the owmeter was calibrated. This
information is used in the correction of temperature induced effects
on the owmeter body dimensions.
Input:
Number with xed decimal point:
-9999.99...+9999.99
VIEW INPUT SIGNAL
TRAP ERROR DELAY
TRAP BLOWING DELAY
Display: 68.00 of
CALIBRATION TEMP.
This feature is used to see the present value of the compensation input signal. The type of electrical signal is determined by the compensation input signal type selection.
Display: 20 mA VIEW INPUT SIGNAL
Enter the TRAP ERROR DELAY (cold trap error) in HH:MM format. An
alarm will only be activated if the trap is detected as continuously being in the abnormal states for a time period greater than this TRAP ERROR DELAY time.
Display: HH:MM TRAP ERROR DELAY
Enter the TRAP BLOWING DELAY (trap stuck open) in HH:MM format.
An alarm will only be activated if the trap is detected as continuously being in the abnormal states for a time period greater than this TRAP BLOWING
DELAY time.
Display: HH:MM TRAP BLOWING DELAY
68
6.10 PULSE OUTPUT
ES749 Flow Computer
PULSE OUTPUT
ASSIGN PULSE OUT­PUT
Assign the pulse output to a measured or calculated totalizer value.
Selection:
HEAT TOTAL, MASS TOTAL, CORRECTED VOL. TOTAL, ACTUAL VOLUME TOTAL
Display: ACTUAL VOLUME TOTAL ASSIGN PULSE OUTPUT
69
ES749 Flow Computer
24V
12345678
13
12
Push-Pull
Internal Power Supply
+
–
12345678
13
12
Open Collector
24V
External Power Supply
+
–
24
0t
24
0t
6.10 PULSE OUTPUT
(Continued)
PULSE TYPE
PULSE OUTPUT
The pulse output can be congured as required for an external
device (i.e. remote totalizer, etc.).
ACTIVE: Internal power supply used (+24V). PASSIVE: External power supply required. POSITIVE: Rest value at 0V (active high). NEGATIVE: Rest value at 24V (active low) or external
power supply.
Active:
Passive:
Positive Pulse:
Negative Pulse:
Selection:
PASSIVE-NEGATIVE, PASSIVE-POSITIVE, ACTIVE-NEGATIVE, ACTIVE-POSITIVE
Display: PASSIVE/POSITIVE PULSE TYPE
70
ES749 Flow Computer
6.10 PULSE OUTPUT
(Continued)
PULSE VALUE
PULSE WIDTH
PULSE OUTPUT
Dene the ow quantity per output pulse. This is expressed in units
per pulse (i.e. ft3 / pulse).
Note:
Ensure that the max. owrate (full scale value) and the
pulse value entered here agree with one another. The max. possible output frequency is 50Hz. The appropriate pulse value can be determined as follows:
Pulse value > estimated max. owrate (full scale)/sec required max. output frequency
Input:
Number with oating decimal point: 0.001...10000.0
Display: 1.000 ft3/P PULSE VALUE
Set the pulse width required for external devices. The pulse width limits the max. possible output frequency of the pulse output. For a certain output frequency, the max permissible pulse width can be calculated as follows:
SIMULATION FREQ.
Pulse width < 1 . 2 • max. output frequency (Hz)
Input:
Number with oating decimal point:
0.01...9.999 s (seconds)
Display: .01 s PULSE WIDTH
Frequency signals can be simulated in order to check any instrument that is connected to the pulse output. The simulated signals are always symmetrical (50/50 duty cycle).
Note:
• The simulation mode selected affects the frequency output.
The ow computer is fully operational during simulation.
• Simulation mode is ended immediately after exiting this submenu.
Selection:
OFF, 0.0 Hz, 0.1 Hz, 1.0 Hz, 10 Hz, 50 Hz
Display: OFF SIMULATION FREQ>
71
ES749 Flow Computer
6.11 CURRENT OUTPUT
SELECT OUTPUT
ASSIGN CURRENT OUT
CURRENT OUTPUT
Select the current output to be congured. The ow computer offers
two current outputs.
Selection:
1 (Current output 1) 2 (Current output 2)
Display: 1 SELECT OUTPUT
Assign a variable to the current output.
Selection:
HEAT FLOW, MASS FLOW, COR. VOLUME FLOW, VOLUME FLOW, TEMPERATURE, TEMPERATURE 2, DELTA TEMPERATURE, PRESSURE, DENSITY, PEAK
DEMAND, DEMAND LAST HOUR
CURRENT RANGE
LOW SCALE
FULL SCALE
Display: VOLUME FLOW
ASSIGN CURRENT OUT.
Dene the 0 or 4 mA low scale current value. The current for the
scaled full scale value is always 20 mA.
Selection:
0-20 mA, 4-20 mA, NOT USED
Display: 4-20 mA CURRENT RANGE
Set the low scale value to the 0 or 4 mA current signal for the variable assigned to the current output.
Input:
Number with oating decimal point: -999999...+999999
Display: .000 ft3/h LOW SCALE VALUE
Set the full scale value to the 20 mA current signal for the variable assigned to the current output.
Input:
Number with oating decimal point:
-999999...+999999
Display: 1000.00 ft3/h FULL SCALE VALUE
72
ES749 Flow Computer
6.11 CURRENT OUTPUT
(Continued)
TIME CONSTANT
CURRENT OUT VALUE
SIMULATION CURRENT
CURRENT OUTPUT
Select the time constant to determine whether the current output signal reacts quickly (small time constant) or slowly (large time
constant) to rapidly changing values (i.e. owrate). The time constant
does not affect the behavior of the display.
Input:
Max. 2 digit number: 0...99
Display: 1 TIME CONSTANT
Display the actual value of the current output.
Display: 0.000 mA CURRENT OUT VALUE
Various output currents can be simulated in order to check any instruments which are connected.
Note:
• The simulation mode selected affects only the selected
current output. The ow computer is fully operational during
simulation.
• Simulation mode is ended immediately after exiting this submenu.
Selection:
OFF, 0 mA, 2 mA, 4 mA, 12 mA, 20 mA, 25 mA
Display: OFF SIMULATION CURRENT
73
ES749 Flow Computer
6.12 RELAYS
SELECT RELAY
RELAY FUNCTION
RELAYS
Set relay output to be congured. Two or three relay outputs are
available.
Selection:
1 (Relay 1) 2 (Relay 2) 3 (Relay 3, optional)
Display: 1 SELECT RELAY
Both relays (1 and 2, and optional 3rd relay) can be assigned to various functions as required:
Alarm functions
Relays activate upon exceeding limit setpoints. Freely assignable to measured or calculated variables or totalizers.
Malfunction
Indication of instrument failure, power loss, etc.
Pulse output
The relays can be dened as additional pulse outputs for totalizer
values such as heat, mass, volume or corrected volume.
Wet steam alarm
The ow computer can monitor pressure and temperature in
superheated steam applications continuously and compare them to the saturated steam curve. When the degree of superheat (distance to the saturated steam curve) drops below 5 °C, the relay switches and the message "WET STEAM ALARM" is displayed.
NOTE: Relay response time is affected by the value entered for display damping. The larger the display damping value, the slower the relay response time will be. This is intended to prevent false triggering of the relays. Enter a display damping factor of zero
(0) for fastest relay response time.
Selection:
Different selections are available depending on the ow equation
and type of transmitter selected.
HEAT TOTAL, MASS TOTAL, CORRECTED VOL. TOTAL, ACTUAL VOLUME TOTAL, HEAT FLOW, MASS FLOW, COR. VOL. FLOW, VOLUME FLOW, TEMPERATURE, TEMPERATURE 2, DELTA TEMPERATURE, PRESSURE,
DENSITY, WET STEAM ALARM, MALFUNCTION, PEAK DEMAND, DEMAND LAST HOUR
Display: VOLUME FLOW RELAY FUNCTION
74
ES749 Flow Computer
6.12 RELAYS
(Continued)
RELAY MODE
RELAYS
Set when and how the relays are switched "ON" and "OFF". This
denes both the alarm conditions and the time response of the alarm
status.
Selection:
HI ALARM, FOLLOW LO ALARM, FOLLOW HI ALARM LATCH LO ALARM LATCH RELAY PULSE OUTPUT
Note:
• For relay functions "MALFUNCTION" and "WET STEAM ALARM". There is no difference between the modes
"HI......" and "LO......":
(i.e. HI ALARM FOLLOW = LO ALARM FOLLOW, HI ALARM LATCH = LOW ALARM LATCH)
• Relay mode "RELAY PULSE OUTPUT" denes the relay
as an additional pulse output.
LIMIT SETPOINT
Display: HI ALARM, FOLLOW
RELAY MODE
After conguring a relay for "Alarm indication" (limit value), the
required setpoint can be set in this submenu. If the variable reaches the set value, the relay switches and the corresponding message is displayed. Continuous switching near the setpoint can be prevented with the "HYSTERESIS" setting.
Note:
• Be sure to select the units (SYSTEM UNITS) before entering the setpoint in this submenu.
• Normally open or normally closed contacts are determined when wiring.
Input:
Number with oating decimal point: -999999...+999999
Display: 99999.0 ft3/h LIMIT SETPOINT 1
75
ES749 Flow Computer
6.12 RELAYS
(Continued)
PULSE VALUE
PULSE WIDTH
RELAYS
Dene the ow quantity per output pulse if the relay is congured
for "RELAY PULSE OUTPUT".. This is expressed in units per pulse (i.e. ft3 / pulse).
Note:
Ensure that the max. owrate (full scale value) and the
pulse value entered here agree with one another. The max. possible output frequency is 5Hz. The appropriate pulse value can be determined as follows:
Pulse value > estimated max. owrate (full scale)/sec required max. output frequency
Input:
Number with oating decimal point: 0.001...1000.0
Display: 1.000 ft3/P PULSE VALUE
Enter the pulse width. Two cases are possible:
Case A: Relay set for "MALFUNCTION" or limit value
The response of the relay during alarm status is determined by selecting the pulse width.
• Pulse width = 0.0 s (Normal setting) Relay is latched during alarm conditions.
• Pulse width = 0.1...9.9 s (special setting) Relay will energize for selected duration, independent of
the cause of the alarm. This setting is only used in special cases (i.e. for activating signal horns).
Case B: Relay set for "RELAY PULSE OUTPUT"
Set the pulse width required for the external device. The value
entered here can be made to agree with the actual ow amount and
pulse value by using the following:
Pulse width < 1 . 2 • max. output frequency (Hz)
Input:
Number with oating decimal point:
0.01...9.99 s (pulse output)
0.00...9.99 s (all other congurations)
Display: .01 s PULSE WIDTH
76
ES749 Flow Computer
6.12 RELAYS
(Continued)
HYSTERESIS
RESET ALARM
RELAYS
Enter a hysteresis value to ensure that the "ON" and "OFF" switchpoints have different values and therefore prevent continual and undesired switching near the limit value.
Input:
Number with oating decimal point:
0.000...999999
Display: 0.000 psia HYSTERESIS
The alarm status for the particular relay can be cancelled here if (for
safety reasons) the setting "......, LATCH" has been selected in the
submenu "RELAY MODE". This ensures that the user is actively aware of the alarm message.
Note:
• When in the HOME position, press the ENTER key to acknowledge and clear alarms.
• The alarm status can only be permanently cancelled if the cause of the alarm is removed.
SIMULATE RELAY
Selection:
RESET ALARM? NO RESET ALARM? YES
Display: RESET? NO RESET ALARM
As an aid during start-up, the relay output may be manually controlled independent of it's normal function.
Selection:
NORMAL, ON, OFF
Display: NORMAL SIMULATE RELAY
77
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
RS-232 USAGE
DEVICE ID
BAUD RATE
COMMUNICATION
The ow computer can be connected via RS-232 interface to a
personal computer or printer.
Selection:
COMPUTER, PRINTER, MODEM
Display: COMPUTER RS-232 USAGE
Enter the unique unit I.D. tag number for the ow computer if a number of ow computers are connected to the same interface.
Selection:
Max. 2 digit number: 0...99
Display: 1 DEVICE ID
Enter the baud rate for serial communication between the ow
computer and a personal computer, modem, or printer.
PARITY
HANDSHAKE
Selection:
9600, 2400, 1200, 300
Display: 9600 BAUD RATE
Select the desired parity. The setting selected here must agree with the parity setting for the computer, modem, or printer.
Selection:
NONE, ODD, EVEN
Display: NONE PARITY
The control of data ow can be dened. The setting required is
determined by the handshaking of the printer.
Selection:
NONE, HARDWARE
Display: NONE HANDSHAKE
78
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
PRINT LIST
COMMUNICATION
Select the variables or parameters which are to be logged or printed via the RS-232 interface.
Selection (Procedure):
CHANGE? NO CHANGE? YES
If YES selected, the available variables are displayed one after another. Only some of the following options are available depending
on the ow equation selected:
Store option Print? advance to next
PRINT HEADER? NO(YES) INSTRUMENT TAG? NO(YES) FLUID TYPE? NO(YES) TIME? NO(YES) DATE? NO(YES) TRANSACTION NO.? NO(YES) HEAT FLOW? NO(YES) HEAT TOTAL? NO(YES) HEAT GRAND TOTAL? NO(YES) MASS FLOW? NO(YES) MASS TOTAL? NO(YES) MASS GRAND TOTAL? NO(YES) COR. VOLUME FLOW? NO(YES) COR.VOL.GRAND TOTAL? NO(YES) VOLUME FLOW? NO(YES) VOLUME TOTAL? NO(YES) VOL. GRAND TOTAL? NO(YES) TEMPERATURE? NO(YES) TEMPERATURE 2? NO(YES) DELTA TEMPERATURE? NO(YES) PROCESS PRESSURE? NO(YES) DENSITY? NO(YES) SPEC. ENTHALPY? NO(YES) DIFF. PRESSURE? NO(YES) ERRORS? NO(YES) ALARMS? NO(YES) PEAK DEMAND? NO(YES) DEMAND LAST HOUR? NO(YES) PEAK TIME STAMP? NO(YES) PEAK DATE STAMP? NO(YES) TRAP MONITOR? NO(YES)
"YES" + ENTER: Parameter is added to the print list "NO" + ENTER: parameter is not printed
After the last option the display advances to the next submenu.
79
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
PRINT INITIATE
DATALOG ONLY
COMMUNICATION
Datalogger and/or printing variables and parameters over the serial RS-232 interface can be initiated at regular intervals (INTERVAL) or
daily at a xed time (TIME OF DAY) or by front key depression.
Note:
Printing can always be initiated by pressing the PRINT key.
Selection:
NONE, TIME OF DAY, INTERVAL, ENABLE PRINT KEY
Display: TIME OF DAY PRINT INITIATE
Select YES or NO for Datalog Only prompt.
Selection:
YES - Data is logged but no information is sent on print event. NO - Data is logged and immediately transmitted.
Display: YES DATALOG ONLY
PRINT INTERVAL
PRINT TIME
DATALOG FORMAT
Dene a time interval. Variables and parameters will be periodically
logged at regular intervals of this value of time. The setting "00:00" deactivates this feature.
Input:
Time value in hours & minutes (HH:MM).
Display: 00:00 PRINT INTERVAL
Dene the time of day that variables and parameters will be logged
out daily.
Input:
Time of day in hours & minutes (HH:MM).
Display: 00:00 PRINT TIME
Dene the Datalog Format.
Selection:
DATABASE - Data sets sent in comma seperated variable
format.
PRINTER - Individual output variables sent with text
label and units suitable for printing.
Display: PRINTER DATALOG FORMAT
80
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
SEND INC. TOT. ONLY
INC ONLY SCALER
CLEAR DATALOG
COMMUNICATION
Select YES or NO for Send Inc. Tot. Only
Selection:
YES - Unit will send Inc. Tot. Only NO - Unit will not send Inc. Tot. Only
Display: YES SEND INC. TOT. ONLY
Enter multiplying factor for Inc Only Scaler
Selection:
X1, X10, X100, X1000
Display: X1 INC ONLY SCALER
Select YES or NO for Clear Datalog
Selection:
YES - Unit wil clear datalog contents NO - Unit will not clear datalog contents
MODEM CONTROL (Modem)
DEVICE MASTER (Modem)
Display: YES
CLEAR DATALOG
Select YES or NO for Modem Control.
Selection:
YES - Modem initializationand dialing commands are sent
during transactions.
NO - Modem initializationand dialing commands are NOT
sent during transactions.
Display: YES MODEM CONTROL
Select YES or NO for Device Master
Selection:
YES - Sets sole master device responsible for initializing
modem.
NO - Device will not be used to initialize modem.
Display: YES DEVICE MASTER
81
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
MODEM AUTO ANSWER (Modem)
CALL OUT NO (Modem)
CALL OUT TIME (Modem)
COMMUNICATION
Select YES or NO for Modem Auto Answer
Selection:
YES - Modem will answer incoming calls. NO - Modem will not answer incoming calls.
Display: YES MODEM AUTO ANSWER
Dene a Call Out Number. Enter the telephone number, or email
address to be called.
Input:
max. 16 digit phone number
Display: ### ### ### ### #### CALL OUT NO
Dene the Call Out Time. Enter scheduled call out time (24 hr format),
if you want the unit to call out to a remote PC.
CALL ON ERROR (Modem)
NUMBER OF REDIALS (Modem)
Input:
Time of day in hours & minutes (HH:MM).
Display: 00:00 CALL OUT TIME
Select YES or NO for Call On Error prompt.
Selection:
YES - Unit will call out to remote PC if a designated CSI
error occurs.
NO - Unit will not call out to remote PC if error occurs.
Display: YES CALL ON ERROR
Enter the Number Of Redials desired in the event of a busy signal or communication problem.
Input:
max. 2 digit number
Display: 3 NUMBER OF REDIALS
82
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
HANG UP IF INACTIVE (Modem)
COMMUNICATION
Select YES or NO for Hang Up If Inactive
Selection:
YES - Unit will hang up if remote PC fails to respond within
several minutes after connection is established.
NO - Unit will not hang up if remote PC fails to respond
after connection is established.
Display: YES HANG UP IF INACTIVE
83
ES749 Flow Computer
6.13
COMMUNICATION
(Continued)
ERROR MASK (Modem)
COMMUNICATION
Select YES or NO for Change Error Mask? prompt
Selection:
YES, NO
Display: 00:00 CALL OUT TIME
If YES selected, dene the conditions that you wish to call out on. The
possible conditions are displayed one after another.
Store option Change? advance to next
POWER FAILURE NO(YES) WATCHDOG TIMEOUT NO(YES) COMMUNICATION ERROR NO(YES) CALIBRATION ERROR NO(YES) PRINT BUFFER FULL NO(YES) TOTALIZER ERROR NO(YES) WET STEAM ALARM NO(YES) OFF FLUID TABLE NO(YES) FLOW IN OVERRANGE NO(YES) INPUT1 OVERRANGE NO(YES) INPUT2 OVERRANGE NO(YES) FLOW LOOP BROKEN NO(YES) LOOP1 BROKEN NO(YES) LOOP2 BROKEN NO(YES) RTD 1 OPEN NO(YES) RTD 1 SHORT NO(YES) RTD 2 OPEN NO(YES) RTD 2 SHORT NO(YES) PULSE OUT OVERRUN NO(YES) Iout 1 OUT OF RANGE NO(YES) Iout 2 OUT OF RANGE NO(YES) RELAY 1 HIGH ALARM NO(YES) RELAY 1 LOW ALARM NO(YES) RELAY 2 HIGH ALARM NO(YES) RELAY 2 LOW ALARM NO(YES) RELAY 3 HIGH ALARM NO(YES) RELAY 3 LOW ALARM NO(YES) TRAP ERROR NO(YES) TRAP BLOWING NO(YES) INPUT 3 OVERRANGE NO(YES) INPUT 3 BROKEN NO(YES) 24VDC OUT ERROR NO(YES) PULSE IN ERROR NO(YES) INPUT 1 Vin ERROR NO(YES) INPUT 1 Iin ERROR NO(YES) INPUT 2 Iin ERROR NO(YES) INPUT 2 RTD ERROR NO(YES) INPUT 3 Iin ERROR NO(YES) INPUT 3 RTD ERROR NO(YES) PULSE OUT ERROR NO(YES) Iout 1 ERROR NO(YES) Iout 2 ERROR NO(YES) RELAY 1 ERROR NO(YES) RELAY 2 ERROR NO(YES) RS-232 ERROR NO(YES) A/D MALFUNCTION NO(YES) PROGRAM ERROR NO(YES) SETUP DATA LOST NO(YES) TIME CLOCK LOST NO(YES) DISPLAY MALFUNCTION NO(YES) RAM MALFUNCTION NO(YES) DATALOG LOST NO(YES)
84
ES749 Flow Computer
6.14
NETWORK CARD
PROTOCOL
DEVICE ID
BAUD RATE
NETWORK CARD
The ow computer can be connected via RS-485 interface to a
personal computer and communicate via Modbus RTU protocol.
Selection:
MODBUS RTU
Display: MODBUS RTU PROTOCOL
Enter the unique unit I.D. tag number for the ow computer if a number of ow computers are connected to the same interface.
Selection:
3 digit number: 1...247
Display: 1 DEVICE ID
Enter the baud rate for serial communication between the ow
computer and a personal computer.
PARITY
Selection:
19200, 9600, 4800, 2400, 1200, 600, 300
Display: 9600 BAUD RATE
Select the desired parity. The setting selected here must agree with the parity setting for the computer.
Selection:
NONE, ODD, EVEN
Display: NONE PARITY
85
ES749 Flow Computer
6.15 SERVICE &
ANALYSIS
EXAMINE AUDIT TRAIL
ERROR LOG
SERVICE & ANALYSIS
Two counters contain the number of times the calibration and/or
conguration parameters have been changed. Changes in important calibration and conguration data are registered and displayed
("electronic stamping"). These counters advance automatically. These counters cannot be reset so that unauthorized changes can
be identied.
Example:
CAL 015 CFG 076
Display: CAL 015 CFG 076 EXAMINE AUDIT TRAIL
A list of errors that have occurred can be viewed and cleared.
Selection:
VIEW? NO VIEW? YES
SOFTWARE VERSION
HARDWARE VERSION
If "YES" is selected the error log can be viewed and errors individually cleared (if editing enabled with Service Code).
Display: CLEAR? NO POWER FAILURE
Display the software version of the ow computer. (Contact local
agent for upgrade information)
Example:
02.00.14
Display: 02.00.14 SOFTWARE VERSION
Display the hardware version of the ow computer. (Contact local
agent for upgrade information)
Example:
01.00.01
Display: 01.00.01 HARDWARE VERSION
86
ES749 Flow Computer
6.15 SERVICE & ANALYSIS
(Continued)
PERFORM CALIBRATION
NOTE:
This menu item will only appear if editing is en­abled with Service Code.
VOLTAGE INPUT CALIBRATION
LEARN
0.0 V
(Pin 2)
SERVICE & ANALYSIS
This feature allows the calibration of the units inputs and outputs.
CAUTION:
The calibration should only be performed by qualied technicians.
The calibration procedure requires the use of precision Voltage &
Current sources, a frequency generator, a 100Ω resistor (± 0.1%),
an ammeter, an ohmmeter and a frequency counter. If calibration fails, use the "Restore Factory Calibration" feature.
Selection:
NO, YES
Display: PERFORM? YES CALIBRATION
Connect your voltage source to (+) Pin 2 and (-) Pin 4.
Apply 0.0 Volts. Press enter to learn 0.0 Volts.
Display: RESULT: 0.000 V LEARN 0.0 V PIN 2
CURRENT INPUT CALIBRATION
20.0 mA
LEARN
10.0 V
(Pin 2)
LEARN
0.0 mA (Pin 2)
LEARN
(Pin 2)
LEARN
0.0 mA (Pin 3)
Apply 10.0 Volts. Press enter to learn 10.0 Volts.
Display: RESULT: 10.000 V LEARN 10.0 V PIN 2
Connect your current source to (+) Pin 2 and (-) Pin 4.
Apply 0.0 mA. Press enter to learn 0.0 mA.
Display: RESULT: 0.000 mA LEARN 0.0 mA PIN 2
Apply 20.0 mA. Press enter to learn 20.0 mA.
Display: RESULT: 20.000 mA LEARN 20.0 mA PIN 2
Connect your current source to (+) Pin 3 and (-) Pin 4.
Apply 0.0 mA. Press enter to learn 0.0 mA.
Display: RESULT: 0.000 mA LEARN 0.0 mA PIN 3
LEARN
20.0 mA (Pin 3)
Apply 20.0 mA. Press enter to learn 20.0 mA.
Display: RESULT: 20.000 mA LEARN 20.0 mA PIN 3
87
ES749 Flow Computer
6.15 SERVICE & ANALYSIS
(Continued)
CURRENT INPUT CALIBRATION (continued)
20.0 mA
LEARN
0.0 mA (Pin 7)
LEARN
(Pin 7)
LEARN
0.0 mA
(Pin 11)
SERVICE & ANALYSIS
Connect your current source to (+) Pin 7 and (-) Pin 4.
Apply 0.0 mA. Press enter to learn 0.0 mA.
Display: RESULT: 0.000 mA LEARN 0.0 mA PIN 7
Apply 20.0 mA. Press enter to learn 20.0 mA.
Display: RESULT: 20.000 mA LEARN 20.0 mA PIN 7
Connect your current source to (+) Pin 11 and (-) Pin 4.
Apply 0.0 mA. Press enter to learn 0.0 mA.
Display: RESULT: 0.000 mA LEARN 0.0 mA PIN 11
RTD INPUT CALIBRATION
Temperature
(Pins 5, 6 & 7)
Temperature 2
(Pins 9, 10 & 11)
LEARN
20.0 mA (Pin 11)
Input
Input
Apply 20.0 mA. Press enter to learn 20.0 mA.
Display: RESULT: 20.000 mA LEARN 20.0 mA PIN 11
Connect a 100Ω resistor between Pins 6 & 7 and place a jumper wire
between Pins 5 & 6.
Press enter to learn RTD resistance on Pins 5, 6 & 7.
Display: RESULT: 100.00 ohm LEARN RTD PIN 5-6-7
Connect a 100Ω resistor between Pins 10 & 11 and place a jumper
wire between Pins 9 & 10.
Press enter to learn RTD resistance on Pins 9, 10 & 11.
Display: RESULT: 100.00 ohm LEARN RTD PIN 9-10-11
88
ES749 Flow Computer
6.15 SERVICE & ANALYSIS
(Continued)
ANALOG OUTPUT 1 CALIBRATION (Pins 14 & 16)
4 mA
(Pins 14 & 16)
20 mA
(Pins 14 & 16)
ANALOG OUTPUT 2 CALIBRATION (Pins 15 & 16)
4 mA
(Pins 15 & 16)
ADJ
ADJ
ADJ
SERVICE & ANALYSIS
Connect your Ammeter (current meter) to (+) Pin 14 and (-) Pin 16.
Observe the reading on the ammeter. Using the numeric keys, enter the actual reading (in mA) and press enter.
Display: ACTUAL? 4.025 mA ADJ 4mA PIN 14-16
Observe the reading on the ammeter. Using the numeric keys, enter the actual reading (in mA) and press enter.
Display: ACTUAL? 20.017 mA ADJ 20mA PIN 14-16
Connect your Ammeter (current meter) to (+) Pin 15 and (-) Pin 16.
Observe the reading on the ammeter. Using the numeric keys, enter the actual reading (in mA) and press enter.
Display: ACTUAL? 4.041 mA ADJ 4mA PIN 15-16
ADJ
20 mA
(Pins 15 & 16)
FREQUENCY OUTPUT SIMULATION (Pins 12 & 13)
Observe the reading on the ammeter. Using the numeric keys, enter the actual reading (in mA) and press enter.
Display: ACTUAL? 20.006 mA ADJ 20mA PIN 15-16
Connect your frequency meter to (+) Pin 12 and (-) Pin 13. This feature is used to check the pulse output. Calibration is not performed.
Selection:
OFF, 50 Hz, 10 Hz, 1.0 Hz, 0.1 Hz, 0.0 Hz
Display: OFF SIMULATION FREQ.
89
ES749 Flow Computer
6.15 SERVICE & ANALYSIS
(Continued)
RELAY TEST
(Pins 17, 18 & 19)
(Pins 20, 21 & 22)
(Pins 19 & 20)
RELAY 1
TEST
RELAY 2
TEST
RELAY 3
TEST
SERVICE & ANALYSIS
Using the ohmmeter, check continuity between pins (17 & 18) and 18 & 19 while turning ON & OFF Relay 1 using the up/down arrow keys. Press enter when test is completed.
Display: RELAY 1: OFF TEST RELAY 1
Using the ohmmeter, check continuity between pins 20 & 21 and (21 & 22) while turning ON & OFF Relay 2 using the up/down arrow keys. Press enter when test is completed.
Display: RELAY 2: OFF TEST RELAY 2
Using the ohmmeter, check continuity between pins 19 & 20 while turning ON & OFF Relay 2 using the up/down arrow keys. Press enter when test is completed.
Display: RELAY 3: OFF TEST RELAY 3
PULSE INPUT TEST
INPUT
FREQUENCY
(Pins 2 & 4)
SAVE AS FACTORY CALIBRATION
RESTORE FACTORY CALIBRATION
SET NEXT CALIBRATION DATE
Using the frequency generator, apply a frequency to (+) Pin 2 and (-) Pin 4. Compare the displayed frequency with the input frequency.
Display: 0.000 Hz INPUT FREQUENCY
The calibration procedure is complete. You may now choose to save this calibration as the Factory Calibration.
Display: NO SAVE AS FACTORY CAL.
If you are not satised with the calibration results you can restore the
last saved Factory Calibration.
Display: NO RESTOR FACT. CALIB.
This feature allows you to enter the next date you would like the unit to be calibrated. This is very useful when components must be periodically calibrated. This date is included on Print Maint. and Setup Reports.
Display: 10 DEC 1999 NEXT CALIBRATION
PRINT MAINT. REPORT
This feature allows you to transmit a maintenance report over the RS-232 port for printout. The report includes error messages and calibration information
Display: NO PRINT MAINT. REPORT
90
ES749 Flow Computer
6.15 SERVICE & ANALYSIS
(Continued)
PRINT SYSTEM SETUP
SELF CHECK
SERVICE TEST
(Not available with 3 Relay option)
NOTE:
This will only appear if editing is enabled with the Service Code.
SERVICE & ANALYSIS
This feature allows the units setup parameters to be printed to a connected printer.
Display: NO PRINT SYSTEM SETUP
This feature starts the self-test of the ow computer. A test is
internally conducted on the EEPROM, A/D Converter, Time/Date clock, Display and several other hardware circuits.
Display: RUN? NO SELF CHECK
The Service Test requires a special calibration apparatus that connects to the rear terminals of the unit. This is used to determine
whether the ow computer or the eld wiring is faulty. The calibration
apparatus may be purchased from your local distributor.
Display: RUN? NO SERVICE TEST
91
7. Principle Of Operation
ES749 Flow Computer
General Operation
Square Law Flowmeter Considerations
7.1 General:
The ES749 Flow Computer uses several internal calculations to compute the compen-
sated ow based on specic data input. Several computations are performed to arrive at the uncompensated ow, temperature, pressure, density and viscosity. This information
is then used to compute the Corrected Volume Flow, Mass Flow or Heat Flow.
7.2 Square Law Flowmeter Considerations:
Head class owmeters are supplied by the manufacturers with a 4-20 mA output span which is already in ow units. The ES749 permits the user to enter this owmeter in-
formation directly. However, closely associated with this information is the density that
was assumed during owmeter calibration. This information must also be input if the
user is to obtain maximum accuracy.
It is assumed that the user has the printout from a standardized sizing program for the particular device he will be using. Such standardized printouts list all the necessary information which the user will then be prompted for.
Several specialized ow equations are listed that are not intended for the standard
unit but to be offered to appropriate OEMs or as special order items. These are desig­nated by a “†”.
Flow Equations
7.3.1 Flow Input Computation
Note concerning Fluid Information
The user will be prompted for Fluid Information during the setup of the instrument.
SeeAppendix A for the properties of several common uids.
7.3 Flow Equations:
Flow Input Computation:
Linear
Input Flow = [% input span • (ow FS - ow low scale)]+ ow low scale
Square Law without External SQRT Extractor
delta P = [(% input span) • ( ow FS - ow low scale)] + ow low scale
Square Law with External SQRT Extractor
delta P = [(% input span)2 • ( ow FS - ow low scale)] + ow low scale
NOTE: For stacked differential pressure option, the appropriate input sensor signal is used in calculations at all times to maximize accuracy.
92
ES749 Flow Computer
7.3.2 Pressure Computation
7.3.3 Temperature Computation
Pressure Input:
General Case
Pf = [% input span • (Pres full scale - Pres low scale ] + Pres low scale
Gauge Case
Pf = Pf + Barometric
Manual Case or In Event of Fault
Pf = Pressure Default Value
Temperature Computation:
General Case
Tf = [% input span • (Temp full scale - Temp low scale ] + Temp low scale
RTD Case
Tf = f ( measured input resistance)
Manual Case or In Event of Fault
Tf = Temperature Default Value
7.3.4 Density/Viscosity Computation
Delta Temp Case Delta Temp = T2 - T1 Flowmeter location = cold Delta Temp = T1 - T2 Flowmeter location = hot
Density Computation:
Water Case
density_water = density (Tf)
Liquid Case
density = reference density • ( 1 - Therm.Exp.Coef. •( Tf - T
2
))
ref
Steam Case
density = 1/ specic volume(Tf, Pf)
Gas Case
Pf (T
+ 273.15) Z
ref
ref
density = reference density • • • P
(Tf + 273.15) Zf
ref
NOTE: For Natural Gas:
Z
ref
is determined by NX-19 when this selection is supplied and selected.
Zf
NOTE: Therm.Exp.Coef is (x 10-6)
93
ES749 Flow Computer
7.3.4 Density/Viscosity Computation
(continued)
7.3.5 Corrected Volume Flow Computation
Viscosity (cP) Computation:
Liquid Case NOTE:
B viscosity (in cP) cP viscosity = A • exp ( Tf + 459.67) density of water @ 4°C
Viscosity cS =
owing density
(
Gas Case
cP viscosity = A • ( Tf + 459.67)
B
Steam Case
cP viscosity = f(Tf, Pf)
Corrected Volume Flow Computation:
Liquid Case
std. volume ow = volume ow • ( 1 - Therm.Exp.Coef. •( Tf - T
))2
ref
Gas Case
std.volume ow = volume ow • Pf . • (T P
( Tf + 273.15) Zf
ref
+ 273.15) • Z
ref
.
ref
)
NOTE: For Natural Gas:
Z Zf
.
ref
is determined by NX-19 when this selection is supplied and selected.
Natural Gas NX-19 Equation: The NX-19 (1963) natural gas state equations are widely used in custody transfer applications. Over most normal measurement ranges, 500 to 5000 psia (3.5 to 10.4 MPa) and -10 to 100°F (-23 to 38°C), the NX-19 equation will compute the gas compressibility factor to within 0.2% of the values computed by the newer AGA-8 state equa­tion. The ranges over which the NX-19 equation applies are: Pressure PG To 5000 psig (10.34 MPa gauge) Temperature Tf -40 to 240°F (-40 to 116°C) Specic Gravity G 0.554 to 1.0 CO2 and N2 0 to 15%
Our Flow Computer uses the Specic Gravity method to rst obtain the adjusted temperature
and pressure before entering the state equation. This method calculates the adjusted pres­sure and temperature from the mole fractions of carbon dioxide and nitrogen as
P
160.8 – 7.22 Gg + 100X
Where X
= 156.47 PG .
adj
C02 and XN2
are the mole fractions of carbon dioxide and nitrogen, respectively. The
– 39.2XN2
C02
psig
adjusted temperature is dened by
T
99.15 + 211.9 Gg – 100X
= 226.29 (TF + 460) °F
adj
– 168.1XN2
C02
94
ES749 Flow Computer
7.3.5 Corrected Volume Flow Computation
(continued)
After calculating the adjusted pressure and temperature, the mixture’s pressure and tempera­ture correlations parameters are calculated by P = P
+ 14.7 T = T
adj
adj
.
1000 500
The compressibility factor is then calculated by rst determining
m = 0.0330378T -2 – 0.0221323T -3 + 0.0161353T
-5
n = (0.265827T -2 + 0.0457697T -4 – 0.133185T -1)m -1 B = 3 – mn
b = 9n – 2mn3 – E .
D = [b + (b 2 + B
Where E is a function of the pressure p and temperature T correlation parameters. The equations for E are given in the following table for the designated regions. The following compressibility Z
2
2
9mp
54mp2 2mp
3 )0.5]1/3
2
is deter-
f
mined by
Z
B / D – D + n / 3p
NX-19 Natural Gas Regions and E Equations
Ranges
P T E
0 to 2 1.09 to 1.40 E1 0 to 1.3 0.84 to 1.09 E
1.3 to 2.0 0.88 to 1.09 E
1.3 to 2.0 0.84 to 0.88 E
2.0 to 5.0 0.84 to 0.88 E
2.0 to 5.0 0.88 to 1.09 E
2.0 to 5.0 1.09 to 1.32 E
2.0 to 5.0 1.32 to 1.40 E
= 1 .
f
2
3
4
5
6
7
8
7.3.6 Mass Flow Computation
7.3.7 Comb. Heat Flow Computation
Ta = T – 1.09 Tb = 1.09 – T E1 = 1 – 0.00075p E2 = 1 – 0.00075p E3 = 1 – 0.00075p + 2.0167T E4 = 1 – 0.00075p + 2.0167T E5 = E4 –X E6 = E3 –X E7 = E1 –X E8 = E7 –X X = A (T – 2) + A1(p – 2)2 + A2(p – 2)3 + A3(p – 2)
2.3
exp (-20Ta) – 0.0011T
2.3
[2 – exp (-20Tb)] – 1.317T
2.3
[2 – exp (-20Tb)] + 0.455(200T
2.3
[2 – exp (-20Tb)] + 0.455(200T
2
– 18.028T
b
2
– 18.028T
b
0.5p2
a
3
+ 42.844T
b
3
+ 42.844T
b
(2.17 + 1.4T
4
p(1.69 – p2)
b
6
– 0.03249Tb
b
4
)(p – 1.3)[1.69(2)
b
6
– 0.03249Tb
b
4
)(p – 1.3)[1.69(2)
b
4
0.5
2
– p)
a
1.25
– p2]
1.25 + 80(0.88 – t)2
1
– p2]
X1 = (p – 1.32)2(p –2)[3 – 1.483(p – 2) – 0.1(p –2)2 + 0.0833(p –2)3] A = 1.7172 – 2.33123T – 1.56796T2 + 3.47644T3 – 1.28603T4 A1 = 0.016299 – 0.028094T – 0.48782T2 – 0.78221T3 + 0.27839T A2 = –0.35978 + 0.51419T + 0.165453T2 – 0.52216T3 + 0.19687T A3 = 0.075255 – 0.10573T – 0.058598T2 + 0.14416T3 – 0.054533T
4
4
4
When NX-19 is used for custody transfer applications, the base compressibility factor is calculated by:
Z
T
= (1 + 0.00132 )
b
3.25
-2
Mass Flow Computations:
mass ow = volume ow • density
Combustion Heat Flow Computations:
combustion heat ow = mass ow • combustion heating value
95
ES749 Flow Computer
∆p
27.7 •p
f
R=1–
κ−1
1−β4)•(
κ
•R
2/
κ
•(1-R
(κ−1)/κ
)
[(1 −(β •
4
R))•(1 -R)]
2/
κ
Y=
=1.0Y
7.3.8 Heat Flow Computation
7.3.9 Sensible Heat Flow Computation
7.3.10 Liquid Delta Heat Computation
Heat Flow Computation:
Steam Heat
heat ow = mass ow • total heat steam(Tf, Pf)
Steam Net Heat heat ow = mass ow • [total heat steam(Tf, Pf) - heat saturated water(Pf)]
Steam Delta Heat heat ow = mass ow • [total heat saturated steam (Pf) - heat water (Tf)]
Sensible Heat Flow:
Special Case for Water
heat ow = mass ow (Tf) • enthalpy ( Tf )
Liquid Delta Heat:
General Case
heat ow = mass ow • specic heat • ( T2 - Tf )
Water Case
heat ow = mass ow(Tf) • [enthalpy (T2 ) - enthalpy (Tf)]
7.3.11 Expansion Factor Computation for Square Law Flow­meters
Expansion Factor Computation for Square Law Flowmeters:
In the following Equations, delta P is assumed in ("H2O), Pf is in PSIA, 27.7 is a PSIA to ("H2O) units conversion.
Liquid Case
Y = 1.0
Gas, Steam Case
Orice Case
delta P Y = 1.0 -(0.41 + 0.35•B4) • isentropic exponent • Pf • 27.7
V-Cone, Venturi, Flow Nozzle, Wedge Case:
NOTE: An equivalent formula is used by V-Cone owmeter types.
Target, Annubar, Pitot Case:
96
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