Max Machinery, Inc. reserves the right to make changes to the product in this Instruction
Manual to improve performance, reliability, or manufacturability. Consequently, contact
MMI for the latest available specifications and performance data.
Although every effort has been made to ensure accuracy of the information contained in
this Instruction Manual, MMI assumes no responsibility for inadvertent errors
Page 4
General Description
1. Description
1.1 Unit Description:
The Max Model 121 Flow Computer satisfies the instrument requirements for a variety of flowmeter
types in liquid applications. Multiple flow equations and instrument functions are available in a single
unit with many advanced features.
The alphanumeric display shows measured and calculated parameters in an easy to understand format.
Single key direct access to measurements and display scrolling is supported.
The versatility of the Model 121 permits a wide measure of versatility within the instrument package.
The various hardware inputs and outputs can be “soft” assigned to meet a variety of common a p p l i c a t i o n
needs. The user “soft selects” the usage of each input/output while configuring the instrument. Consider
the following illustrative examples.
The isolated analog output can be chosen to follow volume flow, corrected volume flow, mass flow, temperature, 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, transaction printing, or for connection to a modem for remote meter reading.
1.2 Unit Features:
The Model 121 Flow Computer offers the following features:
Indoor Use
Altitude up to 2000m
Operating Temperature: 0C to +50C
Storage Temperature: -40C to +85C
Maximum Relative Humidity : 80% for temperatures
up to 31C decreasing linearly to 50% RH at 40C
Main supply voltage fluctuations not to exceed ±10%
of the nominal voltage
Transient overvoltage according to INSTALLATION
CATEGORY II (see UL 3101-1 Annex J)
POLLUTION DEGREE 2 in accordance with
IEC 664 (see 3.7.3)
Materials: UL, CSA, VDE approved
Approvals: CE Approved Light Industrial,
UL File #: E192404
CSA Pending
Display
Type: 2 lines of 20 characters
Type: VFD
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
Enclosure
Size: See Dimensions on page 9
Depth behind panel: 6.5" including mating connector
Type: DIN
Materials: Plastic, UL94V-0, Flame retardant
Bezel: Textured per matt finish
Equipment Labels: Model, safety, and user wiring
Power Input
The factory equipped power option is internally fused.
An internal line to line filter capacitor is provided for
added transient suppression.
121-200: 110VAC: 85 to 127 Vrms, 50/60 Hz
121-201: 12VDC: 10.5 to 14 VDC
Control Inputs
Switch Inputs are menu selectable for Start, Stop,
Reset, Lock, Inhibit, Alarm Acknowledge, Print or Not
U s e d .
Control Input Specifications
Input Scan Rate: 10 scans per second
Logic 1: 4 - 30 VDC
Logic 0: 0 - 0.8 VDC
Transient Suppression: 500 V fast transient
(Capacitive Clamp)
Input Impedance: 100 K
Control Activation: Positive Edge or Pos. Level
based on product definition
Flow Inputs:
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: 5 updates/sec minimum
Automatic Fault detection: Signal over/under-range,
Current Loop Broken
Calibration: Self Calibration and Auto-zero continuously
Extended calibration: Learns Zero and Full Scale
of each range using special test mode.
Fault Protection:
Fast Transient: 500 V Protection
(Capacitive Clamp)
Reverse Polarity: No ill effects
Over-Voltage Limit: 50 VDC Over voltage protection
Over-Current Protection: Internally current limited
Protected to 24 VDC.
Compensation Input
The compensation input is menu selectable for
temperature, density or not used.
Operation: Ratiometric
Accuracy: 0.01% FS
Thermal Drift: Less than 100 ppm/oC
Basic Measurement Resolution: 16 bit
Update Rate: 1 update/sec minimum
Automatic Fault detection:
Signal Over-range/under-range
Current Loop Broken
RTD short
RTD open
Fault mode to user defined default settings
Transient Protection: 500 V (Capacitive Clamp)
Reverse Polarity: No ill effects
Over-Voltage Limit (Voltage Input): 50 VDC
A vailable Input Ranges
Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC
Current: 4-20 mA, 0-20 mA
Resistance: 100 Ohms DIN RTD
100 Ohm DIN RTD (DIN 42-760, BS 1904):
Three Wire Lead Compensation
Internal RTD linearization learns ice point
resistance
1 mA Excitation current with reverse polarity protection
Temperature Resolution: 0.01 C
Excitation Voltage
110/220 VAC Powered Units
Menu Selectable: 5, 12 or 24 VDC @ 100mA
12 VDC Powered Units
5 VDC @ 100mA
Number of Flow Inputs: one
Configurations supported: single input with or
without quadrature (menu selectable)
Input Impedance: 10 K nominal
Pullup Resistance: 10 K to 5 VDC (menu selectable)
Pull Down Resistance: 10 K to common
Trigger Level: (menu selectable)
High Level Input
Logic On: 3 to 30 VDC
Logic Off: 0 to 1 VDC
Low Level Input (mag pickup)
Selectable sensitivity: 10 mV & 100 mV
Minimum Count Speed: User selectable
Maximum Count Speed: Selectable: 0 to 20kHz
Overvoltage Protection: 50 VDC
Fast Transient: Protected to 500 VDC
(Capacitive Clamp)
Relay Outputs
The relay outputs are menu assignable to (individually
for each relay) Low Rate Alarm, Hi Rate Alarm,
Prewarn Alarm, Preset Alarm, Pulse Output (pulse
options) or General purpose warning (security).
Number of relays: 2
Contact Style: Form C contacts
Contact Ratings:
250 VAC @ 5 amps
30 VDC @ 5 amps
Fast Transient Threshold: 1000 V
Serial Communication
The serial port can be used for printing, datalogging,
modem connection and communication with a computer.
Analog Output
The analog output is menu assignable to correspond
to the Uncompensated Volume Rate, Corrected
Volume Rate, Mass Rate, Temperature, Density,
Volume Total, Corrected Volume Total or Mass Total.
Type: Isolated Current Sourcing
Isolated I/P/C: 500 V
Available Ranges: 4-20 mA, 0-20 mA
Resolution: 12 bit
Accuracy: 0.05% FS at 20 Degrees C
Update Rate: 1 update/sec minimum
Temperature Drift: Less than 200 ppm/OC
Maximum Load: 1000 ohms (at nominal line voltage)
Compliance Effect: Less than .05% Span
60 Hz rejection: 40 dB minimum
EMI: No effect at 3 V/M
Calibration: Operator assisted Learn Mode
Averaging: User entry of DSPAveraging constant
to cause a smooth control action.
Isolated Pulse output
The isolated pulse output is menu assignable to
Uncompensated Volume Total, Compensated
Volume Total or Mass Total.
Isolation I/O/P: 500 V
Pulse Output Form: Open Collector
Maximum On Current: 125 mA
Maximum Off Voltage: 30 VDC
Saturation Voltage: 1.0 VDC
Maximum Off Current: 0.1 mA
Pulse Duration: User selectable
Pulse output buffer: 8 bit
Pulse Rate Averaging: Standard
Fault Protection
Reverse polarity: Shunt Diode
Transient Protection: 500 VDC (Capacitive Clamp)
Operating Mode
The Flow Computer can be thought of as making a
series of measurements of flow, temperature/
density sensors and then performing calculations
to arrive at a result(s) which is then updated
periodically on the display. The analog output,
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, viscosity, and density equations
are computed as needed based on the flow
equation and input usage selected by the
user.
Step 3 : Compute the Volumetric Flow-Uncompensated
flow is the term given to the flow in volume
units. The value is computed based on the
flowmeter input type selected and augmented by
any performance enhancing linearization that has
been specified by the user.
Step 4: Compute the Corrected Volume Flow at
Reference Conditions-In the case of a corrected
liquid volume flow calculation, the corrected
volume flow 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 flow rate as volume flow times density.
comparison is now made by comparing the
current flow rates against the specified hi and
low limits.
Step 7: Compute the Analog Output-This designated
flow rate value is now used to compute the
analog output.
Step 8: Compute the Flow Totals by Summation-A
flow total increment is computed for each flow
rate. This increment is computed by multiplying
the respective flow rate by a time base scaler and
then summing. The totalizer format also includes
provisions for total rollover.
Step 9: Total Preset Comparisons-The total associated
with a preset function is then compared
against the corresponding preset value and any
required control actions taken.
Step 10: 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 11: Update Display and Printer Output-The
instrument finally runs a task to update the
various table entries associated with the front
panel display and serial outputs.
Setup Mode
The setup mode is password protected by means
of a numeric lock out code established by the
user. In addition, a secret, manufacturer’s
numeric unlock entry sequence is available.
The system also provides a minimum
implemetation of an “audit trail” which tracks
significant setup changes to the unit. This feature
is increasingly being found of benefit to users or
simply required by Weights and Measurement
Officials in systems used in commerce, trade, or
“custody transfer” applications.
A Worksheet is provided to assist the user in
setting up the instrument. In addition, a software
program is available which runs on a PC using a
RS-232 Serial connection to the Flow
Computer. Illustrative examples may be down
loaded in this manner.
The setup mode has numerous subgrouping of
parameters needed for flow calculations. There
is a well conceived hierarchy to the setup
parameter list. Selections made at the
beginning of the setup affect offerings further
down in the lists.
In the setup mode, the flow computer
activates the correct setup variables based on
the instrument configuration, the flow
equation, and the hardware selections made
for the compensation transmitter type, the
flow transmitter type, and meter
enhancements (linearization) options
selected. All required setup parameters are
enabled. All setup parameters not required
are suppressed.
A help line prompt is provided for each entry.
In addition a help message is available which
may be accessed by depressing the “HELP”
key.
In the setup mode selections, several parameters
are required to be input by the operator
since these parameters are blank when the
unit is received. The user will be prompted
for these necessary values for his application.
A blank parameter will prevent the user from
entering the run mode and a suitable warning
message will be issued.
Also note that in the setup mode there are
parameter selections which have preassigned
industry standard values. The unit will assume
these values unless they are modified 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.
Hint:It is possible to enter in a nominal constant
value for temperature or density, or analog
flow inputs by placing the desired nominal
value into both the lo and hi values. This is
also a convenience when performing bench top
tests without simulators.
Maintenance Mode:
The Maintenance Mode of the 121 Series is the
Test and Calibration Mode for the device. This
mode provides a number of specialized utilities
required for factory calibration, instrument
checkout on start-up, and periodic calibration
documentation.
A password is required to gain access to this
specialized mode of operation. Normally
quality, calibration, and maintenance personnel
will find this mode of operation very useful. It is
also useful for factory testing.
Many of these tests may be used during start-up
of a new system. Inputs signals may be read, and
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 Maintenance Mode:
Print Calibration/Maintenance Report
Examine Audit Trail
Perform Keypad Checkout
Perform Display Checkout
Perform Pulse Input Checkout
Perform Pulse Output Checkout
Perform Control Input Checkout
Perform Relay Output Checkout
Perform Analog Input Checkout
Perform Analog Output Checkout
Calibrate Analog Inputs using the Learn Feature
Calibrate Analog Output using the Learn Feature
Battery Check
Note that a calibration of the analog input/output
will advance the audit trail counters since it
effects the accuracy of the system.
RS-232 Serial Port
The 121 Series has a general purpose RS-232 Port
which may be used for any one of the following
purposes:
logging and/or printing of calibration and
maintenance reports.
For transaction printing, the user defines 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, a remote contact
closure, or upon completion of a batch.
In data logging, the user defines 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 lists all
the instrument setup parameters and usage for the
current instrument configuration. In addition, the
Audit trail information is presented along with 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.
Transaction Printing
Data Logging Internal Datalog Dumps
Computer Communication Link
Configuration by Computer
Print System Setup
Print Calibration/Malfunction History
Remote Control
Instrument Setup by PC’s over Serial Port
A Diskette program is provided with the 121 Series
that enables the user to rapidly configure the indicator
using a 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.
Operation of Serial Communication Port with
Printers
121 Series’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
The 121 Series 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:
Mounting Procedure:
a. Prepare the panel opening.
b. Slide the unit through the bezel adaptor and gasket.
c. Push the unit through the panel cutout until it touches the panel.
d. Install the screws (provided) in the mounting bracket and slip the bracket over
the rear of the case until it snaps in place.
e. Tighten the screws firmly to seat the bezel against the panel.
Termination Connectors:
Minimum Wire Gauge: 22 AWG
Maximum Wire Gauge: 14 AWG
Voltage/current limits are limited by unit specifications.
Permanently Connected Equipment:
UL 3101-1, Section 6.12.2.1 specifies that:
• A switch or circuit breaker shall be included in the building installation;
• It shall be in close proximity to the equipment and within easy reach of the
OPERATOR;
• It shall be marked as the disconnecting device for the equipment.
Ensure that the switch or circuit breaker chosen is suitable for the power
requirements of the unit.
2.2 Mounting Diagrams:
121 Series
Mounting Bracket
Dimensions
RATE
3.43
(87)
TOTAL 267395.749
1
START
GRAND6SCROLL7PRE 28DENS
STOP
121 Series
Mounting Bracket
5.67 (144)
GPM
147.43
GAL
TEMP4PRE 13RATE2TOTAL
PRINT
5
TIME
9
0
–
6.18
Dotted Line Shows Optional Bezel Kit
CLEAR•MENU
HELP
2.83
(72)
ENTER
0.28 (7.2)
0.4 (10)
6.15
(156)
0.5
(13)
Bezel Adaptor
Gasket
5.43
(138)
Panel
Cutout
2.68
(68)
Page 10
Applications
3. Applications
3.1 Liquid Volume
Measurements:
A flowmeter measures the actual volume in a liquid line. Atemperature sensor can also be installed to correct
for liquid thermal expansion (see 3.2 Corrected Volume).
Calculations:
• For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter
frequency output and the user entered K-Factor.
• For Flowmeters with Analog Transmitters, Volume flow is calculated using the measured
flowmeter signal and the user entered scale settings.
Output Results:
• Display Results
Flow Rate, Resettable Total, Non-Resettable Total
• Analog Output
Rate or Total
• Pulse Output
Total
• Relay Outputs
Rate or Total Alarms
Applications:
The Flow Computer can monitor actual volume flow and total of any liquid. Flow alarms are provided via
relays and datalogging is available via analog (4-20mA) and serial outputs.
A flowmeter measures the actual volume in a liquid line. Atemperature sensor is installed to correct for liquid
thermal expansion.
Calculations:
• Corrected Volume is calculated using the flow and temperature inputs as well as the thermal expansion
coefficient stored in the flow computer. Use the "SET FLUID PROPERTIES" submenu to define reference
temperature and density values for standard conditions.
Output Results:
• Display Results
Flow Rate, Resettable Total, Non-Resettable Total, Temperature, Density
• Analog Output
Rate, Total, Temperature or Density
• Pulse Output
Total
• Relay Outputs
Rate , Total or Temperature Alarms
Applications:
Monitoring corrected volume flow and total of any liquid. Flow alarms are provided via relays and datalogging
is available via analog (4-20mA) and serial outputs.
Actual volume is measured by the flow element (DP transmitter, Flowmeter). Temperature
is measured by the temperature transmitter.Adensity transmitter can be used for direct
density measurements.
Calculations:
• The density and mass flow are calculated using the reference density and the thermal expansion coefficient of
the liquid (see "SET FLUID PROPERTIES" submenu)
Output Results:
• Display Results
Flow Rate, Resettable Total, Non-Resettable Total, Temperature, Density
• Analog Output
Rate, Total, Temperature or Density
• Pulse Output
Total
• Relay Outputs
Rate, Total or Temperature Alarms
Applications:
Monitoring mass flow and total of any liquid. Flow alarms are provided via relays and datalogging is available
via analog (4-20mA) and serial outputs.
A flowmeter measures the actual volume in a liquid line. Atemperature sensor can also
be installed to correct for liquid thermal expansion (see 3.2 Corrected Volume).
Calculations:
• For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter frequency output and the
user entered K-Factor.
• For Flowmeters with Analog Transmitters, Volume flow is calculated using the measured flowmeter signal and
the user entered scale settings.
• Corrected Volume is calculated using the flow and temperature inputs as well as the
thermal expansion coefficient stored in the flow computer.
Output Results:
• Display Results
Flow Rate, Batch Total, Non-Resettable Total, Temperature, Density
• Analog Output
Rate, Total, Temperature or Density
• Pulse Output
Total
• Relay Outputs
Batch Total, Rate, or Temperature Alarms
Applications:
Batching and monitoring flow and total of any liquid. Batching is accomplished via
relays and datalogging is available via analog (4-20mA) and serial outputs.
The 121 Series is fully programmable through the front panel. Please review the following usage summary before
attempting to use the instrument.
HELP
On-line help is provided to assist the operator in using this product. The help is available during RUN and SETUP
modes simply by pressing the HELP key. The HELP key is used to enter decimals when entering numeric values.
FUNCTION KEYS
In the RUN mode, several keys have a special, direct access feature, to display an item of interest (i.e. RATE,
TOTAL, PRESET1, etc.). Press the key to view your choice. Press the SCROLL key to return to scrolling display.
CLEARING TOTALIZER
To clear the total, you must press the TOTALFunction Key 3 times. You will be asked to verify this action. The
operator will be prompted to enter password if the unit is locked. NOTE: In the Batcher Mode, simply press the
CLEAR key to reset the total (the batcher must be stopped or finished batching). It is not necessary to press the
TOTALFunction Key first.
CLEARING GRAND TOTAL
To clear the grand total, you must press the GRAND Function Key 3 times. You will be asked to verify this action.
The supervisor will be prompted to enter the supervisor password if the unit is locked.
PRESET KEYS
In the RUN mode, PRESET 1 & PRESET 2 keys are used to view and/or change the preset setpoints. To view the
Presets,simply press the desired Preset key. Rapidly press the Preset keys 3 times, then press the Clear key for direct
editing of the preset setpoints.
SCROLL
Rapidly press the Scroll key twice to setup a display list. Press the CLEAR key to remove old scroll list. Press the
function key for the item you wish to add Use the arrow keys to assign the line.
PRINT
The PRINT key is used to print on demand. When the PRINT key is pressed, a user defined list of data (TOTAL,
RATE, PRESET1, etc.) is sent to the RS-232 port. A timed message of "PRINTING" will be displayed to
acknowledge the print request.
SPECIAL BATCHING KEYS
The START and STOP keys are used only when batching to start and stop batches. The CLEAR key will clear the
total without first pressing the TOTALkey (unit must be stopped). All other keys work the same in both Rate/Total
mode and Batch mode. The Start and Stop keys operation are set by the control input settings. The Start options are:
START or RESET/START. The Stop options are: STOP or STOP/RESET.
MENU KEY
The MENU key is used to enter the Setup and Test modes. Press the MENU key to enter the Setup and Test modes.
(See section 6 for Setup mode, section 8 for Test mode). The MENU key is used as "escape" in Setup and Test
Programming. Pressing the MENU key while programming in the Sub-Menu groups will backup the display to that
Sub-Menu group heading. Pressing the MENU key while viewing the Sub-Menu groups will backup the display to
the Top Level Menu.
ACKNOWLEDGING ALARMS
Most alarm messages are self-clearing. Press the ENTER key to acknowledge and clear alarms.
NOTE: Some keys and functions are password protected. Enter the password to gain access. The passwords are
factory set as follows:
The unit can display: Rate, Total, Grand Total, Temperature, Density, Presets and Time of Day. The Temperature
and/or Density can be displayed even if you are using the Volumetric Flow Equation (a Temperature or Density
sensor must be installed). The unit can perform Mass or Corrected Volume equations using a temperature or density
sensor (these equations can be computed without Temp/Dens sensors by using user defined default values). The
unit can be programmed to perform Ratemeter/Totalizer or Batching functions (see section 6.3, SELECT
INSTRUMENT Submenu).
5.3 Ratemeter/TotalizerOperation
The Ratemeter/Totalizer mode is used primarily to monitor flowrate and accumulated total. The relays can be
used to trigger flow, total, temperature or density alarms.
5.3.1 Password Protection for Rate/Total mode
After an Operator and/or Supervisor Password is entered in the setup mode (see section 6.3, SETUP PASSWORD
submenu), the unit will be locked. The unit will prompt the user for the password when trying to perform the
following functions:
Clear Total
Clear Grand Total
Enter Menu
Edit Preset 1
Edit Preset 2
The Supervisor password should be reserved for supervisors. The Supervisor password will allow access to
restricted areas of the Setup and Test menus.
5.3.2 Relay Operation in Rate/Total mode
Two relays are available for alarm outputs. The relays can be assigned to trip according to rate, total, temperature,
density readings or general system alarms. The relays can be programmed for low or high alarms. Preset 1(RLY1)
and Preset 2 (RLY2) are easily accessible by pressing the PRESET 1or PRESET 2 key on the front panel.
5.3.3 Pulse Output in Rate/Total mode
The isolated pulse output (open collector) is menu assignable to Volume Total, Corrected Volume Total or Mass
Total. The pulse output duration can be set for 10mS (50 Hz max) or 100mS (5 Hz max). A pulse output scale
factor (pulse value) can be set to scale the pulse output. The pulse output is ideal for connecting to remote
totalizers or other devices such as a PLC. See section 1.3 for electrical specifications.
5.3.4 Analog Output in Rate/Total mode
The analog output is menu assignable to correspond to the Volume Rate, Corrected Volume Rate, Mass Rate,
Temperature, Density, Volume Total, Corrected Volume Total or Mass Total. The analog output is ideal for "trend"
tracking using strip chart recorders or other devices.
5.3.5 RS-232 Serial Port Operation in Rate/Total mode
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).
PC Communications:
The Setup Disk also allows the user to query the unit for operating status such as Flow Rate, Flow Total,
Temperature, Density, Presets, etc.
Transaction Printing
For transaction printing, the user defines the items to be included in the printed document
(see section 6.3.20 SET DATA OUTPUT, Select_list). The transaction document can be initiated by pressing the
PRINT key or by a remote contact closure.
Data Logging
In data logging, the user defines the items to be included in each data log (see section 6.3.20 SET PRINTER
OUTPUT, Select_list). The user can also select when (time of day) or how often (print interval) the data log is to
be made (see section 6.3.19 SET PRINTER OUTPUT, Configure).
System Setup and Maintenance Report
The system setup and maintenance report lists all of the instrument setup parameters and usage for the current
instrument configuration. The audit trail information and a status report is also printed. This report is initiated in
the Test menu (see section 8.2.3 PRINT SYSTEM SETUP).
5.4 Batcher Operation
The Batcher mode is used primarily to control batches. The main difference between the Batch mode and
Rate/Total mode is the relay operation. The Batch mode allows the operator to "START" the unit via the front
panel or remote input. Once started, the relays (RLY1 & RLY2) will energize and send power to a flow control
device (i.e. solenoid valve or pump). The flow sensor will send a signal to the unit and total accumulation will
begin. When the Prewarn value (PRESET 2) is reached, Relay 2 will drop out (this is ideal for flow slow down).
When the Batch amount (PRESET 1) is reached,Relay 1 will drop out and the Batch is complete.
Several messages will be displayed during normal batch operation (i.e. Batch Fill, Batch Stopped). The keypad is
disabled for the duration of these timed messages (approx. 2 sec).
5.4.1 Batcher Configuration.
When the unit is programmed for batch mode, several batch operation choices are
available. These choices include: Up or Down Counting, Maximum Batch Preset, Batch
Overrun Compensation, Auto Batch Restart, Time Delay, Flow Signal Timeout, Maximum
Drain Time, Slow Start Quantity, Start or Reset/Start, and Stop or Stop/Reset.
Batch Count Mode
The Batch Count Mode allows the user to choose whether the unit will batch up to a
preset value or batch down from a preset value to zero.
Maximum Batch Preset
The Maximum Batch Preset allows the user to program the Maximum Batch value allowed to be entered by the
operator. If an operator should try to program a batch higher then this value, the unit will not allow the value to
be entered and will prompt the user with an error message saying that the Maximum Batch Preset has been
exceeded.
Batch Overrun
The Batch Overrun is used for batch applications that have slow responding valves and a consistent batching
flowrate. When the Batch Overrun is set, the unit will compensate for batch overruns by computing an averaged
overrun value from the last four batches. This average is used to internally adjust the batch setpoint to minimize
overrun.
Auto Batch Restart
The Auto Batch Restart function allows the user to set an amount of time to automatically restart a batch after the
completion of a batch (choose on or off).
The Time Delay for Auto Batch Restart functions as follows: When a batch is completed, the next batch will
automatically start after the amount of time entered here. This time can be set from 1 to 99 seconds.
Flow Signal Timeout
The Flow Signal Timeout allows the user to enter a timeout of 0 to 99 seconds. If a batch is “Filling” and zero
flow persists for more than the user entered time then the batch will be aborted. This prevents over flows due to
faulty flow sensors and/or wiring.
Maximum Drain Time
The unit declares that a batch is “done” when the flow rate equals “0”. A flow rate may be present long after the
Preset Relay de-energizes due to slow reacting valves or leaky valves. The Maximum Drain Time allows the
user to enter an amount of time (0 to 99 seconds) to wait before declaring “Batch Done”. After the Preset Batch
quantity is reached, the unit will declare “Batch Done” when the flow rate is “0” or the Maximum Drain Time
has expired. The batch data will then be available for printing and datalogging.
Slow Start Quantity
The Slow Start Quantity is a function that allows an amount to be entered for a Slow Start up. This function
requires two stage valve control. RLY 1 (slow flow) will energize for Slow Start and RLY 2 (fast flow) will
energize after the Slow Start Quantity has been delivered. This helps reduce turbulence when filling an empty
container.
START, RESET/START and STOP, STOP/RESET
When configuring the control inputs, Control Input1 can be set for START or RESET/START. When set for
START, the unit will start batching when a signal is applied to Control Input1 or the front panel Start key is
pressed. A separate Reset signal must be used to clear the previous batch total. When set for RESET/START, the
unit will automatically reset then start when a signal is applied to Control Input1 or the front panel Start key is
pressed (provided that the pervious batch was completed). If a previous batch was stopped during a batch cycle,
the unit will Start from where it was stopped. Control Input 2 can be set for STOP or STOP/RESET. When set
for STOP, the unit will stop batching when a signal is applied to Control Input 2 or the front panel Stop key is
pressed. A separate Reset signal must be used to clear the batch total. When set for STOP/RESET, a running
batch will stop when a signal is applied to Control Input 2 or the front panel Stop key is pressed. If the unit is
Stopped or after a completed batch, the unit will reset when a signal is applied to Control Input 2 or the front
panel Stop key is pressed. NOTE: Applying a voltage level to Control Input 2 will inhibit all Start inputs in
either mode.
5.4.2 Password Protection for Batcher Mode
After an Operator and/or Supervisor Password is entered in the setup mode (see section 6.3, SETUP PASS
WORD submenu), the unit will be locked. The unit will prompt the user for the password when trying to per
form the following functions:
Clear Grand Total
Enter Menu
The Supervisor password should be reserved for supervisors. The Supervisor password will allow access to
restricted areas of the Setup and Test menus. The passwords are factory set as follows:
Operator = 0
Supervisor = 2000
5.4.3 Relay Operation in Batcher mode
Two relays are available for alarm outputs. Preset 1 (RLY1) is reserved for batch amount, Preset 2 (RLY2) is
reserved for prewarn. (see section 5.4 Batcher Operation for Relay 1 & Relay 2 functions) Preset 1 (RLY1) and
Preset 2 (RLY2) are easily accessible by pressing the PRESET 1 or PRESET 2 key on the front panel.
The isolated pulse output (open collector) is menu assignable to Volume Total, Corrected Volume Total or Mass
Total. The pulse output duration can be set for 10mS (50 Hz max) or 100mS (5 Hz max). A pulse output scale
factor (pulse value) can be set to scale the pulse output. The pulse output is ideal for connecting to remote
totalizers or other devices such as a PLC. See section 1.3 for electrical specifications.
5.4.5 Analog Output in Batcher mode
The analog output is menu assignable to correspond to the Volume Rate, Corrected Volume Rate, Mass Rate,
Temperature, Density, Volume Total, Corrected Volume Total or Mass Total. The analog output is ideal for
"trend" tracking using strip chart recorders or other devices.
5.4.6 RS-232 Serial Port Operation in Batcher mode
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).
PC Communications:
The Setup Disk also allows the user to query the unit for operating status such as
Flow Rate, Flow Total, Temperature, Density, Presets, etc.
Operation of RS-232 Serial Port with Printers:
Transaction Printing
For transaction printing, the user defines the items to be included in the printed document (see section 6.3.20
SET DATAOUTPUT, Select_list). The transaction document can be initiated by pressing the PRINT key, by a
remote contact closure or print at end of batch.
Data Logging
In data logging, the user defines the items to be included in each data log (see section 6.3.20 SET PRINTER
OUTPUT, Select_list). The user can also select when (time of day) or how often (print interval) the data log is
to be made (see section 6.3.19 SET PRINTER OUTPUT, Configure).
System Setup and Maintenance Report
The system setup and maintenance report lists all of the instrument setup parameters and usage for the current
instrument configuration. The audit trail information and a status report is also printed. This report is initiated in
the Test menu (see section 8.2.3 PRINT SYSTEM SETUP).
6.1 Front Panel Operation Concept for Program Mode
The 121 Series may be fully programmable through the front panel. Please review the following usage summary
before attempting to use the instrument.
Setup Mode:
MODE CHANGES
Pressing the MENU key will offer selections of RUN, SETUP, TEST. RUN is the normal operating mode for
the instrument. SETUP offers various sub-menus used for instrument setup. TEST offers various sub-menus for
Test, Calibration and System Start-up.
Submenu GROUP NAVIGATION
Use the UP and DOWN arrow keys to navigate up and down through the Sub-Menu groups when in the SETUP
or TEST mode. Press the ENTER key to enter a desired setup or test Sub-Menu group.
SELECTION OF ITEM
During setup, the unit will often offer multiple choices for a given topic. The topic prompt appears on the top
line of the display. The choices are shown on the lower line of the display.
To select an item, press the key beneath the desired choice. The selected choice will blink. Press the
ENTER key to accept the selected choice.
NUMERIC ENTRY
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. Press the CLEAR key to clear the existing value and to
enable editing.
TEXT CHARACTER ENTRY
Some setup items (i.e. Descriptors, Units Label) require the user to enter text characters. Press CLEAR to
enable editing. The UP and DOWN arrow keys are used to scroll through the available character sets for each
individual character. Press the ENTER key to accept the character and advance to the next character.
The EZ Setup routine is a quick and easy way to configure the unit for the most commonly used instrument
functions. This setup assumes that you are measuring Volumetric Flow. Entering the EZ Setup mode
automatically sets many features. This may cause any previously programmed information to be lost or reset.
For a complete customized configuration, see sections 6.3 and 6.4.
6.2.1
TOP LEVEL
SETUP MENU
6.2.2
EZ Setup
Submenu
Groups
SELECT OPERATE STATE
Run Setup Test
SELECT EZ SETUP
ARE YOU SURE?
No Yes
INSTRUMENT TYPE
Rate/Tot Batch
RATE time base
Sec Min Hour Day
RATE Dec places
0
TOTALVOLUME UNITS
gal
Select Setup to enter the instrument setup routine.
Press ENTER to begin EZ Setup routine.
Confirm that you want to run EZ Setup. Caution:
Any previous program settings may be lost or
reset.
Instrument Type.
Select the appropriate rate time base.
Enter the desired rate decimal location.
0-3 decimal places allowed.
Enter the desired totalizer units label.
TOTALDec places
0
K_FACTOR TYPE
Avg LinTbl UVC
AVERAGE KA-FACTOR
####### P/gal
LINEAR TABLE KA
Fre01:######## Hz
LINEAR TABLE KA
KA--01:##########
FS ANALOG OUT 20mA
#######gal/m
RATE 00.0 gal/m
TOTAL0 gal
Enter the desired totalizer decimal location. 0-3
decimal places allowed.
Enter the desired K-Factor Type.
If Average selected, Enter the desired Average KFactor.
If LinTbl or UVC selected,
Enter the desired frequency/ K-Factor pair for
each point in the Linearization Table. (up to 16 pairs)
Enter a frequency of 0 for any point other than
Fre01 to exit Linearization Table setup.
Enter the desired full scale setting for the analog
output.
Refer to page 21 for EZ Setup routine.
Press the DOWN (stop) key to advance to
Instrument Type. Press the UP (start) key to
advance to Administrative Setup.
Press ENTER to enter Instrument Type submenus.
Press ENTER when Rate/Total is flashing to
configure the instrument as a
Ratemeter/Totalizer.
If Rate/Tot selected, advance to Select Flow
Equation.
Press ENTER to enter Instrument Type submenus.
Press ENTER when Batch is flashing to configure the instrument as a Batcher.
Select UP to Reset to 0 and count up to preset.
Select DOWN to reset to Preset and count
down to 0.
Enter the maximum allowable Batch Preset. The
operator will not be able to enter a batch preset
larger than this value.
Select ON to set the unit to operate using a
Batch Overrun Compensation routine.
Select OFF to inhibit Batch Overrun
Compensation routine. (See Section 5.4)
Select On to enable the Auto Batch Restart.
This will automatically restart the unit at the end
of each batch run. Select Off if this is not desirable.
Enter Time Delay for Auto Batch Restart. When
a batch is completed, the next batch will start
after the amount of time entered here.
Enter a timeout of 0 to 99 seconds. If a batch is
“Filling” and zero flow persists for more than this
time, the batch will be aborted.
Enter time (0-99 sec.) for Max. Drain Time. After
batch quantity is reached, “Batch Done” is
declared when the flow rate is “0” or the
Maximum Drain Time has expired.
Enter a quantity for a Slow Start up. RLY 2
(slow flow) will energize for Slow Start and RLY
1 (fast flow) will energize after the Slow Start
Quantity has been delivered.
START
START
START
START
START
START
START
Page 24
6.4.3
SELECT
FLOW EQUATION
S E L E C T FLOW EQUAT I O N
ENTER
S E L E C T FLOW EQUATION
Volume Mass Cor/Vol
ENTER
Advance To
SETUP INDICATORS (Total)
Press ENTER to enter Select Flow Equation submenus.
Press ENTER when desired flow equation is
flashing.
6.4.4
SETUP
INDICATORS
(Total)
6.4.5
SETUP
INDICATORS
(Density)
SETUP INDICATORS
ENTER
SETUP INDICATORS
Total Dens Rate Temp
ENTER
TOTALDESCRIPTOR
TOTAL
ENTER
TOTALVOLUME UNITS
gal
ENTER
TOTALDEC PLACES
0
ENTER
Advance To
SETUP INDICATORS
(Density)
SETUP INDICATORS
Total Dens Rate Temp
ENTER
DENSITY DESCRIPTOR
DENS
ENTER
DENSITY MASS UNITS
lbs
ENTER
DENSITY DEC PLACES
0
ENTER
Press ENTER to begin setup of the Indicators
Press ENTER when Total is flashing to configure
the Totalizer Indicators
Enter the desired Total Descriptor
Enter the desired Volume Units Label for the
Totalizer.
Select the desired Total Decimal Place.
0-3 decimal places allowed.
Press ENTER when Dens is flashing to configure
the Density Indicators.
Enter the desired Density Descriptor.
Enter the desired Mass Units Label for Density.
Select the desired Density Decimal Place.
0-3 decimal places allowed.
Press ENTER when Rate is flashing to configure the Ratemeter Indicators
Select the desired Rate Time Base.
Enter the desired Descriptor for the Ratemeter.
Select the desired Rate Decimal Place.
0-3 decimal places allowed.
Enter desired Rate Averaging Filter.
Enter desired Percent of Change for Quick
Update. If the current flowrate deviates by an
amount greater than the percentage value
entered, the Rate Averaging is inhibited.
(See Page 62 for more details.)
Press ENTER when Temp is flashing to configure the Temperature Indicators.
Enter the desired Temperature Descriptor.
Enter the desired Temperature Scale.
Select the desired Temperature Decimal Place.
0-3 decimal places allowed.
Press ENTER when Pulse is flashing to configure
the flow input for Pulse signals.
Enter the desired Pulse type. See side note.
Select the desired Input Pulse Trigger Level.
Select the desired Low Pass Filter.
(Max. Count Speed).
Select the proper input termination.
Enter the desired Maximum Sample Window Time
(1-99 sec).
Enter the desired K-Factor Type.
If Avg selected, Enter the desired Average K-Factor.
LINEAR TABLE KA
Fre01:######## Hz
ENTER
If LinTbl selected,
Enter the desired frequency/ K-Factor pair for each
point in the Linearization Table.
NOTE: Enter 0 for Fre value of any point (other than
LINEAR TABLE KA
KA--01:####### P/gal
ENTER
LOW FLOW RATE ALARM
####### gal/m
ENTER
HIGH FLOW RATE ALARM
####### gal/m
ENTER
Advance To
SETUP AUX INPUTS
Enter the desired volumetric Low Rate Alarm.
This will trigger an alarm message if alarm conditions occur. The relays are not affected.
Enter the desired volumetric High Rate Alarm.
This will trigger an alarm message if alarm conditions occur. The relays are not affected.
Fre01) to exit the routine and use the values
entered up to that point.
Press ENTER to begin setup of the Auxiliary Input.
NOTE:
When Density (Dens)
is selected, The menu
prompts will be very
similar to the
Temperature prompts.
The menus will
prompt the user for
density values and
density units.
AUX INPUT TYPE
None Dens Temp
ENTER
AUX SIGNAL TYPE
Voltage Current RTD
ENTER
INPUT SIGNAL RANGE
0-10V 0-5V 1-5V
INPUT SIGNAL RANGE
4-20mA0-20mA
ENTER
AUX LOW SCALE
###### F
ENTER
AUX FULL SCALE
###### F
ENTER
AUX DEFAULT
###### F
ENTER
AUX LOW ALARM
###### F
ENTER
AUX HIGH ALARM
###### F
ENTER
DENS EXTRACT METHOD
Therm_Coef API_2540
ENTER
Select Temperature to set the Auxiliary Input for
Temperature inputs.
Choose Temperature Signal Type.
Advance to "Aux Default", if RTD selected.
If Voltage selected,
Choose desired Voltage Range. Skip if RTD.
If Current selected,
Choose desired Current Range. Skip if RTD.
Enter the low temperature scale corresponding to the low
temperature signal. Skip if RTD.
Enter the high temperature scale corresponding to the
high temperature signal. Skip if RTD.
Enter the Default Temperature.
The unit will use this value if the temperature input fails.
Enter the Low setpoint for the Temperature Alarm.
Enter the High setpoint for the Temperature Alarm.
Choose the Density Extraction method to be used.
(API_2540 Equation not recommended)
Press ENTER at this prompt to Set Fluid Properties.
Enter the Reference Density. This is used in the calculation of density when you have a temp transmitter and
used for corrected flow calculation if you have a density
transmitter.
Enter the Reference Temperature.
Enter the proper Expansion Factor.
(If Temp Compensated for Mass or Corrected Volume)
See Section 7.4, Calculating the Expansion Factor.
Enter the Calibration Density. This is used in calculation
of flow for analog inputs using SQRT.
Not applicable for P.0 meters
Not applicable for P.0 meters
Enter the Base Density H2O@4C. This is used in the
centistoke calculation for UVC.
6.4.13
SETUP
PULSE OUTPUT
Advance To
SETUP Pulse OUTPUT
SETUP PULSE OUTPUT
ENTER
PULSE OUTPUT USAGE
Off Vol CVol/Mass
ENTER
PULSE WIDTH
10mS 100mS
ENTER
PULSE VALUE
####### gal/P
ENTER
Advance To
SETUP ANALOG OUTPUT
Press ENTER at this prompt to setup the Pulse Output.
Select the desired Pulse Output Usage.
Select the desired Pulse Width for the Pulse Output.
Enter the desired Pulse Value for the Pulse Output (Units
per Pulse).
1. Relay activation is based on the computed readings not the displayed value. Therefore the display
damping factor will not affect the relay response time. The RELAY DELAY feature allows the
user to enter a time delay for relay activation. This feature is very useful in applications where
short over/under range conditions are not considered alarm conditions.
2. When INSTRUMENT TYPE is set to batcher, Relay 1 is reserved for PRESET and Relay 2 is
reserved for PREWARN. (the Prewarn value is relative to the Preset value. Input the
number of units that Relay 2 should “drop out” in advance of Relay 1.)
3. Setting the relays to NA (Not Assigned), will allow the relay activation to be controlled via the
RS-232 Serial ports.
If Control Input 1 Selected,
Select Inhibit Total or NA (Not Assigned).
6.4.17
SETUP CONTROL
INPUTS
(BATCH)
C O N T R O L INPUT2 USAGE
RESET_TOTALNA
CONTROL INPUT3 USAGE
Prn Ack KeyLk NA
ENTER
Advance To
SETUP REALTIME CLOCK
SETUP CONTROL INPUTS
Input1 Input2 Input3
ENTER
CONTROL INPUT1 USAGE
Start Rst/Start NA
CONTROL INPUT2 USAGE
Stop Stop/Rst NA
CONTROL INPUT3 USAGE
Rst Prn KeyLk Ack NA
ENTER
Advance To
SETUP REALTIME CLOCK
If Control Input 2 Selected,
Select Reset Total or NA (Not Assigned).
If Control Input 3 Selected,
Select Prn (Print), Ack (acknowledge), KeyLk (Keylock)
or NA (Not Assigned). ACK will acknowledge and clear
alarms and warning messages.
Note:Alarms may reassert themselves if alarm conditions are still present.
Select the desired Control Input for setup.
If Control Input 1 Selected,
Select Start ,Reset/Start, NA (Not Assigned).
If Control Input 2 Selected,
Select Stop, Stop/Reset, NA (Not Assigned).
If Control Input 3 Selected,
Select Prn (Print), Ack (acknowledge), KeyLk (Keylock)
or NA (Not Assigned). ACK will acknowledge and clear
alarms and warning messages.
Note: Alarms may reassert themselves if alarm conditions are still present.
The 121 Series Flow Computer uses several internal calculations to compute the compensated flow based on
specific data input. Several computations are performed to arrive at the uncompensated flow, temperature,
density and viscosity. This information is then used to compute the Corrected Volume Flow or Mass Flow.
7.3 Flow Equations:
Input Flow Computation:
Linear or External SQRT
Input Flow = [% input span • (flow FS - flow low scale)]+ flow low scale
Input Flow Computation:
General Case
Tf = [% input span • (temp FS - Temp low scale)] + temp low scale
RTD Case
Tf = f(measured input resistance)
Input Density Computation:
Temperature Transmitter
density = reference density • (1 - Therm.Exp.Coef. • (Tf-Tref))
Density Transmitter
density = [% input span • (density FS - density low scale)] + density low scale
Uncompensated Flow Computation:
Pulse Input; Average K-Factor
Volume Flow = input frequency • time scale factor
Pulse Input; Linear Table
Volume Flow = input frequency • time scale factor
Analog Input; Linear
2
K-Factor
K-Factor (Hz)
Volume Flow = input flow
Analog Input; Linear Table
Volume Flow = input flow • correction factor (input flow)
Two temperature-specific gravity pairs will be required to compute the temperature coefficient.
The reference temperature is simply chosen by the user. Common reference temperatures are 60 F or 15 C.
The reference temperature should be chosen so that it is in the application temperature range. (ex. application
temperature range -10 to 120 F, reference temperature of 60 F chosen.)
Enter the reference temperature you have chosen at this point.
The reference specific gravity corresponds to the fluid SPECIFIC GRAVITY at the reference temperature
chosen.
You may convert the fluid density information to specific gravity if it is in units other than specific gravity. Use
EQ1.
CAUTION: Since the expansion factor is based on a per degree change in temperature, the temperatures used in
the following equations must match (Fahrenheit or Centigrade) the units used on the indicator display programming.
Expansion Factor
Equations
EQ1.
Spec.Grav. = Density of Fluid / Density of Water
Given the reference temperature, reference specific gravity, a second temp. and a second
Spec.Grav., the Expansion Factor (C Factor) can be computed as follows:
EQ2. Used for Liquid Mass and Corrected Volume Equations
C = 1 - √ (Spec.Grav.2 / Ref.Spec.Grav.) x 1,000,000
Temp.2 - Ref.Temp
Given the reference temperature, reference density, a second temp. and a second density,
the Expansion Factor (C Factor) can be computed as follows:
Example: Diesel fuel (0.845@20˚C, 0.830@42˚)
C = 1 - √ 0.83/0.845 x 1,000,000 = 405.25
(42-20)
EQ3. Used for Liquid Mass and Corrected Volume Equations
The Linearization Table is used when the flow input device gives a nonlinear input signal. The
unit uses up to 16 different points, as entered by the operator, to form a curve for linearizing
the input signal.
Notes:
1) A minimum of three points must be set up.
2) If "0" is entered for the frequency of any point other than point 1, the Flow Computer
assumes there are no more points above the points that preceded them. The display will
advance to the next setup prompt. Extrapolation is taken from the last two nonzero points.
3) If the input frequency is above the highest or below the lowest frequency programmed, the
unit will use the last known point for the K factor in computing the resulting actual flow.
4) Frequencies or apparent flows should be entered in ascending order.
7.6.2 Linearization Table for Pulse Inputs
The linearization table for pulse inputs programming is quite simple when values of frequency and flow are
known. The Flow Computer asks for 16 different frequencies (Freq) and 16 corresponding K factors (K). It then
uses this data to determine what the actual flow is for any given input frequency. Usually the necessary data is
provided with the flowmeter.
7.6.3 Linearization Table for Analog Inputs
The Linearization Table for Analog inputs programming is similar to the Pulse input setup. The Flow Computer
asks for 16 different flow rates (apparent flow) and 16 corresponding Correction Factors. It then uses this data
to determine what the Actual flow is for any given apparent input signal. Again, a minimum of three points must
be set up.
Correction factor =Actual Flow
Apparent Input Flow
The same rules that applied for the Digital setup apply for the Analog setup as well.
The Flow Computer prompts you for the Apparent input signal (APR) and a correction factor (CFr) to multiply
it by to yield true actual flow.
ALL I/O REFERNCES ARE CALIBRATED AT THE FACTORY PRIOR TO SHIPMENT CAUTION:
This unit must be calibrated using precision and calibrated equipment.
Equipment needed is as follows: Frequency Generator, Digital Multimeter,
Precision Current/Voltage Source, Oscilloscope, Frequency Counter.
Calibration
Submenu Group
8.2.6
Calibrate CH1 0mA
Submenu Group
8.2.7
Calibrate CH1 20mA
Submenu Group
Calibrate
ENTER
Calibrate ch1 0mA
Iin=TB1-3 GND=TB1-4
ENTER
Calibrate ch1 0mA
CALIBRATING ——
Calibrate ch1 0mA
*** DONE ***
Calibrate ch1 0mA
Iin=TB1-3 GND=TB1-4
Calibrate ch1 20mA
Iin=TB1-3 GND=TB1-4
ENTER
Calibrate ch1 20mA
0 CALIBRATING ——
Press Enter to begin the calibration routine. (Please note the
caution above)
Connect Current Source (+) TB1-3, (-) TB1-4. Input 0mA and
press Enter.
This message is displayed during calibration.
This message is displayed when the 0mA calibration is finished.
The display will automatically return to the Calibrate CH1
0mA submenu. Press the Down arrow key to advance to the
CH1 20mA calibration.
Connect Current Source (+) TB1-3, (-) TB1-4. Input 20mA
and press Enter.
This message is displayed during calibration.
Calibrate ch1 20mA
*** DONE ***
Calibrate ch1 20mA
Iin=TB1-3 GND=TB1-4
This message is displayed when the 20mA calibration is finished.
The display will automatically return to the Calibrate CH1
20mA submenu. Press the Down arrow key to advance to
the CH2 0mA calibration.
To Calibrate: Connect a jumper wire between TB1-6 and TB17, Place a 100 ohm 0.1% resistor between TB1-7 and TB1-8.
Press enter to calibrate.
This message is displayed during calibration.
This message is displayed when the RTD calibration is finished.
The display will automatically return to the Calibrate 100 ohm
RTD top-level menu. Press the Down arrow key to advance to
the 4mA out calibration.
Page 50
STOP
STOP
ENTER
ENTER
MENU
STOP
MENU
8.2.15
output: Press CLEAR to enable editing and enter a
small negative number (i.e. -0.100) to force a display reading,
then clear and enter small quantity measured on your meter.
The display will return to Calibrate 0mA out. Press the down
arrow key to advance to Cal. 20mA out or repeat above if
necessary.
Connect ammeter to (+) TB1-15, (-) TB1-16. Press enter.
To trim 20mA output: Press CLEAR to enable editing and enter
the current reading that is on the ammeter display. Press
enter.
The display will automatically return to the Calibrate 20mA out
submenu. Calibration is complete.
Press the Menu key to go back to Calibrate top-level menu.
Press enter to test the analog inputs.
To check voltage input accuracy: Use TB1-4 as Reference
Ground, input 0-10 Volts to TB1-2 and/or TB1-5. Display
should show voltage being input. Use voltage meter to verify
input.
To check current input accuracy: Use TB1-4 as Reference
Ground, input 0-20mA to TB1-3 and/or TB1-8. Display should
show current being input. Use ammeter to verify input.
To check RTD input accuracy: Connect a jumper wire between
TB1-6 and TB1-7, Place a 100 ohm 0.1% resistor between
TB1-7 and TB1-8. Display should show 100 ohms ±0.1%.
Press Menu key to return to Analog In Test top-level menu.
Calibrate 4mA Out
Submenu Group
8.2.16
Calibrate 20mA Out
Submenu Group
8.2.17
Analog In Test
Submenu Group
Calibrate 0mA out
+ TB1-15 - TB1-16
ENTER
Calibrate 0mA out
Enter mA: 0.00000
Calibrate 0mAout
+ TB1-15 - TB1-16
Calibrate 20mA out
+ TB1-15 - TB1-16
Calibrate 20mA out
Enter mA: 20.00000
ENTER
Calibrate 20mAout
+ TB1-15 - TB1-16
Calibrate
Connect ammeter to (+) TB1-15, (-) TB1-16. Press enter.
Use the Up/Down arrow keys to select the appropriate trigger
level.
Use the Up/Down arrow keys to select the appropriate frequency range.
To check Pulse input accuracy: Use TB1-4 as reference
ground, input a frequency on TB1-2. The display should show
frequency being input. Use a frequency counter to verify input.
Press Menu key to return to Pulse input test top-level menu.
Press Enter to test the analog output.
To simulate analog output: Connect an ammeter to (+) TB1-15,
(-) TB1-16. Press the key under the desired setting to move
the asterisk (*). The unit should output the selected current.
Press Menu key to return to Analog out test top-level menu.
8.2.20
Excitation out test
Submenu Group
Excitation out test
ENTER
Excitation out test
*5v 12v 24v
Excitation out test
Press Enter to test the excitation output.
To test the excitation output: Connect a voltmeter to (+) TB1-1,
(-) TB1-4. Press the key under the desired setting to move the
asterisk (*). The unit should output the selected voltage.
Press Menu key to return to Excitation out test top-level menu.
o simulate a frequency on the pulse output: Connect a frequenc
counter to (+)TB1-13,
(-)TB1-14. Press the key under the desired setting to move the
asterisk (*). The unit should output the selected frequency.
Press Menu key to return to Pulse out test top-level menu.
Press Enter to test the relays.
To manually control the relay outputs: Press the key under the
desired relay to toggle the relays On/Off. Use an ohmmeter to
check the relay contacts.
Press Menu key to return to Relay Test top-level menu.
Press Enter to test the control inputs.
To check the control inputs: Use TB1-12 as reference, input a DC
signal to TB1-9, TB1-10 and/or TB1-11, The Display will show O
when input is active, OFF when inactive.
Press Menu key to return to control input test top-level menu.
1. Make sure you follow proper E.S.D. Precautions. All persons performing this replacement must follow proper
grounding procedures.
2. Turn the power to the unit off.
3. Disconnect the two piece connector rear terminal block, leaving all connections in place.
4. Remove the unit from the panel.
5. Remove the four machine screws (see fig. 1) which hold the two sections of the case together.
6. The rear section of the case should detach from the rest of the case. It may be necessary two cut the wiring
label along the joint where the two sections connect. With the rear section of the case removed the fuse will be
exposed (located near the rear terminal, AC connection).
7. Locate the Fuse F1 (see fig. 2) and unplug the fuse from its socket.
8. Insert the new fuse into the socket. Insure that the pins are fully inserted and straight.
9. Reassemble the case and install the four machine screws which join the two sections of the case.
10. Reinstall the unit into the panel.
11. Reconnect the rear terminal block.
12. Turn the unit back on.
Fuse Specifications:
110 VAC Power:160mA/250V, TD Wickman 19372-030-k or equivalent
220 VAC Power:80mA/250V, TD Wickman 19372-026-k or equivalent
12/24 VDC Power:800mA/250V, TD Wickman 19374-046-k or equivalent
The Model 121 Series 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 (optional)
Computer Communication Link
Configuration by Computer
Print System Setup
Print Calibration/Malfunction History
9.2 Instrument Setup by PC’s over Serial Port
A Diskette program is provided with the Model 121 Series that enables the user to rapidly configure the unit using a
Personal 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.
9.3 Operation of Serial Communication Port with Printers
The Model 121’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 defines 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, a remote contact closure, or upon completion of a batch.
In data logging, the user defines 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.
The user may specify a “next calibration date” for periodic maintenance. The unit will automatically remind the user that
calibration is scheduled during instrument power up and in some printed documents after that date.
9.4 121 Series RS-232 Port Pinout
1 Handshake Line
2 Transmit
3 Receive
4 Do Not Use
5 Ground
6 Do Not Use
8 Do Not Use
9 Do Not Use
The Model 121 setup program provides for configuring, monitoring and controlling the indicator.
Sample applications are stored in disk files. The setup program calls these Templates. You can store the setup
from the program’s memory to either the Model 121 (Downloading the file) or to a disk file (Saving the file) for
later usage. Similarly you can load the setup in program memory from either a disk file (Opening a file) or from
the Model 121 unit (Uploading a file).
The program can monitor outputs from the unit while it is running.
The program can reset alarms and totalizers.
For assistance there are mini-helps at the bottom of each screen in the program. There is also context sensitive
help available for each screen accessible by pressing the F1 key.
11.1 System Requirements:
IBM PC or compatible with 386 or higher class microprocessor
4 MB RAM
3 MB free disk space
VGA or higher color monitor at 640 x 480
Microsoft® Windows™ 3.1 or 3.11 or Windows 95™
Communication Port - RS-232
RS-232 Cable
11.2 Cable and Wiring Requirements:
The serial communication port on your PC is either a 25 pin or 9 pin connector. No cabling is supplied with the
setup software. A cable must be purchased separately or made by the user. It is recommended to purchase a
modem cable which matches the available communication port on you PC and a 9 pin male connection for the
Model 121 serial port.
11.3 Installation for Windows™ 3.1 or 3.11
The Setup Software includes an installation program which copies the software to your hard drive.
Insert Setup Disk 1 in a floppy drive.
In the Program Manager, click File, and then select Run.
NOTE: For Windows 95™ Click the Start button, select Run and proceed as follows:
Type the floppy drive letter followed by a colon (:) and a backslash (\), and the word setup. For Example:
a:\setup
Follow the instructions on your screen.
11.4 Using the Flow Computer Setup Software
The setup software window consists of several menu “Tabs”. Each tab is organized into groups containing
various configuration and/or monitoring functions. To view the tab windows, simply click on the tab. The
previous tab window will be hidden as the new tab window is brought to the foreground.
The File Tab has three sections. Any of the options on this tab can also be accessed from the File submenu.
The Template Section provides for opening and saving templates. The Save and Save As buttons provide the
standard Windows functionality for dealing with files. The Load button is used to open existing templates.
There are two additional menu items available only from the File menu: Create new file and Templates.
The Create new file, option allows for creating custom templates using the existing template in memory as the
starting point. Assign a new name for this template. The template will be saved under this new name.
The Template option will bring up a list of predefined templates that can be loaded into the program. These
predefined templates are useful as a starting point when defining custom templates.
A typical scenario using the setup program would be the following:
• Open up a predefined template from the supplied list
• Choose ‘Save As’ to save this to a new file name
• Proceed to customize the template by making any changes that are needed
• Save the template to disk (if you want to reuse this template)
• Download the template to an attached unit.
The Communications with Model 121 Section allows the user to upload a template file from the unit, download
the program’s current template to the unit or Compare the program’s current template with the unit.
The Print (report) Section allows the user to:
1. Configure the current WindowsTMprinter through the Select Printer option.
2. Print a Maintenance Report through the PC's printer using the Print Maintenance option.
3. Print the current template through the PC's printer using Print Setup option.
11.6 Setup Tab
The Setup tab is where majority of the 121 Series instrument setup modifications are done. The Setup tab is
divided into five sections.
NOTE: Many setup items are enabled or disabled depending on previous setup selections, It is important to
System Section:Parameters, Display, Indicators
Input Section:Flow, Fluid, Compensations, Control Inputs
Output Section:Pulse, Currents
Relay Section:Relays
Other Settings Section:Administration, Communication, Printing
work your way through the above list in the order shown. Be sure to verify your selections when you are
through programming to insure that no settings were changed automatically.
sign
in front of the group title. If a group is collapsed and data in the group changes on refresh, the group will
automatically expand. Changing the view items requires stopping the current viewing, checking the new
selections and then restarting the viewer.
If communication errors occur while reading data from the indicator, the word ‘Error’ will appear in
place of the actual value. If the connection to the 121 Series is lost, the viewer will time out with a message
saying the device is not responding.
The viewer will attempt to communicate with the indicator matching the device ID set in the
communications screen. If you are having trouble establishing communication, compare settings for the PC and
the flow computer. Also verify the connections between the PC and flow computer.
11.8 Misc. Tab
This tab has three sections: Tools, Actions and Options.
The tools section contains various system administration activities such as creating/modifying the initial sign-on
screen or calibration, service test etc.
Create Sign-on, Create Print Header, Calibration, Service Test
The Actions section is used to send commands to the Model 121.
Reset Totalizers, Reset Alarms
The Options section has the following selections:
Linearization, PC Communication
Additional capabilities may be provided in the future.
NOTE: Future options appear as disabled buttons on the screen.
The View Tab screen allows for viewing selected group items on the PC in a similar format as shown on
the unit display. Data from the following groups can be viewed in the List of Values section:
Process Parameters (i.e. rate, temperature)
Totalizers (i.e. total, grand total)
The setup software assumes the current setup has been uploaded from the flow computer into the PC. It is
important that the setup program and the Model 121 unit are using the same setup information at all times or
the data will be inconsistent. It is best to upload or download the setup before using this feature.
To start the viewer, first check the boxes of items to view and then click the start button. The data will appear in
the appropriate sections and will be continuously updated. The refresh rate is dependent on the number of items
that are being viewed and the baud rate of the connection. Data in the List of Values section can be collapsed
by clicking on the ‘minus’ sign in front of the group title. The data can be expanded by clicking on the ‘plus’
reassert themselves if alarm conditions are still present.
Analog Output
The analog signal (4-20mA) that is generated by the Model 121. It can correspond to the Rate, Total, Temperature or
Density. This output is used primarily for transmission of process information to remote systems.
Audit Trail
The audit trail is used to track the number of changes made to the units setup program.
Auto Batch Restart
The Auto Batch Restart function allows the user to set an amount of time to automatically restart a batch after the
completion of a batch. This time can be set from 1 to 99 seconds.
Batch Count Mode
Batch Count Mode specifies the user preference for count direction. The "Up" selection begins with a value of "0" and
counts up until the batch size is reached. The "Down" selection begins with a value equal to the desired batch size and
counts down to "0".
Batch Overrun
The Model 121 offers a batch overrun compensation routine. If batch overrun occurs due to slow valve response time, the
unit will compensate for the overrun amount on the next batch. This feature can be disabled if desired.
Batcher
An instrument which controls the dispensing of desired batch amounts. Liquid batching systems are usually comprised of a
batch controller (batcher), flowmeter and control valve. The batcher opens and closes the valve through the use of relays
and measures the amounts of liquid being dispensed via the flowmeter.
Baud Rate
The speed of serial communication transmissions, expressed in bits per second.
C-Factor (Fluid Expansion Factor)
A parameter in a flow equation which is used to describe the relationship between density or volume and temperature
changes.
Corrected Volume Flow
The equivalent volume at a reference temperature condition which involves the measurement of liquid volume flow using a
flow sensor and temperature sensor to compensate for thermal expansion.
Custody Transfer
Weights and Measure metering codes often specify several requirements for instruments and mechanisms to prevent and
track changes in the setup of an instrument which may be used in the commercial sale of goods. The Model 121 tracks
changes via the Audit Trail.
Data Logger
The capturing of information for printing out later use and the mechanism for specifying the conditions where a capture
should be made.
DC Output / Excitation Voltage
An on-board DC power supply used to power peripheral sensors. The Model 121 offers excitation voltages of 5VDC, 12VDC
or 24VDC when powered by AC voltage.
Default Value
The value to be used by the instrument if a sensor failure or out of range signal is detected.
Expansion Factor
See C-Factor
Flow Alarm
A visual indication that the volumetric flowrate is above or below the flow alarm setpoint specified by the user.
Acknowledge & Clear Alarms
Acknowledge is used to clear alarm relays and remove any visual alarm messages from the display. In the run mode, press
the ENTER key or activate CONTROL INPUT 3 (if set for ACK) to momentarily clear alarms and alarm messages.
means of controlling the information flow between two pieces of equipment to prevent the sending device from transmitting
information at a rate faster than what can be accepted by the receiver.
Hysteresis
The relay hysteresis is a "dead band" setting which allows the relay to remain energized for a given amount below the
setpoint. This is used to prevent relay chatter when the process value is near the setpoint value.
Example: If the Preset is set at 100, and the hysteresis is set at 10, the relay will energize when the rate, temp or dens.
reaches 100, the relay will remain energized until the reading falls below 90.
Input Termination
Input signal lines on digital inputs often require pullup or pulldown resistor configurations to operate properly with different
sensor configurations. The Model 121 contains such resistors and may be enabled via the setup menu.
Inhibit Totalizer
"Inhibit Total" is a Control Input 1 setting that is used to stop the totalization. If enabled, a voltage level on control input 1 will
inhibit the total as long as the voltage is present. This feature is useful during meter proving and in applications that provide a
sensor to signal the flow computer when fluid is present.
K-Factor
A scaling factor derived from the pulses produced by a flowmeter output, expressed in pulses per unit (i.e. pulses/gallon)
Limit Setpoint
An alarm trip point setting which specifies the value or magnitude of a process parameter necessary to activate an alarm
indicator or control relay.
Linear Flowmeter
A flow measurement device whose output is proportional to flow.
Linearization
The mathematical correction of a nonlinear device. The Model 121 uses a linearization Table which is made up of
input/output values and makes interpolations of the table to arrive at a "linearized" measurement.
LinTbl
Abbreviation for Linearization Table.
Low Flow Cutoff
A value set at which any flow measurements read below this value will be ignored.
Low Pass Filter
A low pass filter passes low input frequencies while blocking high frequencies. In the Model 121, this is the maximum input
count speed to be encountered in an application. It is expressed in counts per second (Hz).
Mass Flow
Mass Flow is inferred by the volumetric flow and density (or implied density) of a fluid.
Flow Signal Timeout
Flow Equation
Follow, Alarm
Function Key
Handshake
The Flow Signal Timeout allows the user to enter a timeout of 0 to 99 seconds. If a batch is “Filling” and zero flow persists for
more than the user entered time then the batch will be aborted. This prevents over flows due to faulty flow sensors and/or wiring.
A flow control expression or algorithm describing a mathematical equation to be solved by a flow computer in the desired
application.
Alarm relays which are non latching and whose output state is based solely on the comparison of the current process value
and the alarm setpoint (trip point).
A key on a push-button panel or keyboard (whose function is described by the key label) used to perform an instrument
function or special routine.
The max. window time sets the maximum sample time (1 to 99 sec) for the ratemeter.
Modem Init Master
The "Modem Init Master" menu allows the user to select whether the unit will engage in a configuration conversation with the
modem on power up or impart no setup information to the modem and use it "as is". For most users it is recommended to
choose "yes" for "Modem Init Master".
Parity
A method for detecting errors in transmissions of serial communications data.
Preset
A set point used to trigger the relay outputs of the 121 Series.
Print Interval
The print interval allows the 121 Series to transmit information to the serial port at selectable time intervals.
Private Code
An operator password code which authorizes changes to the setup of the instrument but blocks access to the
Service/Calibration/Test mode. The private code also blocks the clearing of the Grand Total.
Process Parameters
Any sensor information which has been scaled to engineering units including Flow, Temperature and Density.
Pulldown (Input Termination)
The termination of an input at which the input is pulled down to ground through a resistor. Inputs that are terminated by this
method need to be driven high with a positive voltage pulse.
Pullup (Input Termination)
The termination of an input at which the input is pulled up to a positive voltage through a resistor. Inputs that are terminated
by this method need to be pulled low with a sinking current or contact to ground .
Pulse Output
The pulse output of the 121 Series is available for remote accumulation of the total or sent to peripheral devices, such as a
PLC. The output can be scaled using the Pulse Output Scaling Constant.
Quad
Abbreviation for Quadrature. Quadrature signals are used for direction control. Two flowmeter signals are output with a 90°
phase shift. The counter counts UP when channel Aprecedes channel B, and counts DOWN when Channel A lags Channel B.
Quick Setup
A utility that provides for rapid configuration of an instrument. The Model 121 quick setup provides the following:
1) Prompts the user for only critical information.
2) Automatically sets specifications to common uses.
After following the Quick Setup procedure, the unit will be operational to perform the basic measurement. The setup can be
further customized using the setup menus.
Maximum Batch Preset
The Maximum Batch Preset allows the user to program the Maximum Batch value allowed to be entered by the operator. If
an operator should try to program a batch higher then this value, the unit will not allow the value to be entered and will
prompt the user with an error message saying that the Maximum Batch Preset has been exceeded.
Maximum Drain Time
The unit declares that a batch is “done” when the flow rate equals “0”. A flow rate may be present long after the Preset Relay
de-energizes due to slow reacting valves or leaky valves. The Maximum Drain Time allows the user to enter an amount of
time (0 to 99 seconds) to wait before declaring “Batch Done”. After the Preset Batch quantity is reached, the unit will declare
“Batch Done” when the flow rate is “0” or the Maximum Drain Time has expired. The batch data will then be available for printing and datalogging
The rate averaging filter is used to stabilize fluctuating rate displays. Higher settings provide more averaging for a more sta-
ble display. Derived from the equation:
(OLD DATA x "Avg. Filter" + NEW DATA)
("Avg. Filter" + 1)
Ratemeter
Any device used to display the speed of a process. The ratemeter in the Model121 Series displays flow rate.
Ref. Dens.
Abbreviation for Reference Density. This is the fluid density at reference temperature.
Ref. Temp.
Abbreviation for Reference Temperature. This represents the base or reference condition to which corrected flow will be computed.
Reset/Start Control Input
In a batching system, a single operator activation of the ST A RTkey or Control Input 1 will reset the total then start the batch process.
Single_Pulse
The Single_Pulse setting is used for flowmeters with single pulse outputs.
Slow Start Quantity
The Slow Start Quantity is a function that allows an amount to be entered for a Slow Start up. This function requires two
stage valve control. RLY 1 (slow flow) will energize for Slow Start and RLY 2 (fast flow) will energize after the Slow Start
Quantity has been delivered. This helps reduce turbulence when filling an empty container.
Sqrt
Abbreviation for Square Root Extraction. Used for flow elements using differential pressure measurements.
Stop/Reset Control Input
In a batching system, a single operator activation of the STOP key or Control Input 2 will stop the batch process then reset
the total.
Time Constant
A damping factor for an averaging filter for the analog output. (see also Rate Averaging Filter)
Totalizer
Any device which accumulates and displays a total count.
UVC
Abbreviation for Universal Viscosity Curve. Apresentation of the combined flowrate/viscosity calibration for a turbine flowmeter.
VFD
Abbreviation for Vacuum Fluorescent Display
Visc Coef
Abbreviation for Viscosity Coefficient. One or more coefficients in an equation used to describe the viscosity as a function of
temperature for a fluid.
Volume Flow
The measurement of volumetric flow.
Quick Update %
This feature is used to disable the rate averaging filter when a significant change in the flow rate occurs. The user can enter the
percent of change needed to be detected to disable the averaging feature. This is especially useful during start-up and shutdown of flow
Alarms may reassert themselves if the alarm condition is still
present.
NOTE: A historical error alarm log is available in the "Test Mode".
The following descriptions suggest possible causes and corrective actions for each alarm message.
TYPE OF ERRORDESCRIPTION
Sensor/Process Alarms
Errors detected due to sensor
failure or process alarm conditions
Self Test Errors
Errors detected during self test.
System Alarms
Errors detected due to system
failure
13.1 Response of Model 121 on Error or Alarm:
Error and warning indications which occur during operation are indicated in the RUN mode alternately with the
measured values. The Model 121 Flow Computer has three types of error:
Some alarms are self clearing. Other alarms require the user to acknowledge and clear the alarm. Press the
ENTER button to acknowledged and clear alarms.