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ES-749
Operating Manual
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KEP ES-749 Operating Manual

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.
2
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
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