Omega FC-21 User Manual

User’s Guide

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99579 08/21/03

FC-21

Flow Computer

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

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TEMPERATURE

䡺⻬

Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies

䡺⻬

Wire: Thermocouple, RTD & Thermistor

䡺⻬

Calibrators & Ice Point References

䡺⻬

Recorders, Controllers & Process Monitors

䡺⻬

Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

䡺⻬

Transducers & Strain Gages

䡺⻬

Load Cells & Pressure Gages

䡺⻬

Displacement Transducers

䡺⻬

Instrumentation & Accessories

FLOW/LEVEL

䡺⻬

Rotameters, Gas Mass Flowmeters & Flow Computers

䡺⻬

Air Velocity Indicators

䡺⻬

Turbine/Paddlewheel Systems

䡺⻬

Totalizers & Batch Controllers

pH/CONDUCTIVITY

䡺⻬

pH Electrodes, Testers & Accessories

䡺⻬

Benchtop/Laboratory Meters

䡺⻬

Controllers, Calibrators, Simulators & Pumps

䡺⻬

Industrial pH & Conductivity Equipment

DATA ACQUISITION

䡺⻬

Data Acquisition & Engineering Software

䡺⻬

Communications-Based Acquisition Systems

䡺⻬

Plug-in Cards for Apple, IBM & Compatibles

䡺⻬

Datalogging Systems

䡺⻬

Recorders, Printers & Plotters

HEATERS

䡺⻬

Heating Cable

䡺⻬

Cartridge & Strip Heaters

䡺⻬

Immersion & Band Heaters

䡺⻬

Flexible Heaters

䡺⻬

Laboratory Heaters

ENVIRONMENTAL MONITORING AND CONTROL

䡺⻬

Metering & Control Instrumentation

䡺⻬

Refractometers

䡺⻬

Pumps & Tubing

䡺⻬

Air, Soil & Water Monitors

䡺⻬

Industrial Water & Wastewater Treatment

䡺⻬

pH, Conductivity & Dissolved Oxygen Instruments

M2571/0803

1. DESCRIPTION

1.1 Unit Description ...............................................................................................1

1.2 Unit Features ...................................................................................................1

1.3 Specifications ..................................................................................................2

2. INSTALLATION

2.1 General Mounting Hints................................................................................... 6

2.2 Mounting Diagrams .........................................................................................6

3. APPLICATIONS

3.1 Liquid Volume..................................................................................................7

3.2 Corrected Liquid Volume .................................................................................8

3.3 Liquid Mass .....................................................................................................9

3.4 Batching ........................................................................................................ 10

4. WIRING

4.1 Typical Batcher Wiring................................................................................... 11

4.2 Typical Rate/Total Wiring ............................................................................... 11

4.3 Wiring In Hazardous Areas............................................................................ 12

5. UNIT OPERATION

5.1 Front Panel Operation Concept for Run Mode ..............................................13

5.2 General Operation .........................................................................................14

5.3 Ratemeter/Totalizer Operation ......................................................................14

5.3.1 Password Protection for Rate/Total mode ...................................... 14

5.3.2 Relay Operation in Rate/Total mode ...............................................14

5.3.3 Pulse Output in Rate/Total mode ....................................................14

5.3.4 Analog Output in Rate/Total mode ..................................................14

5.3.5 RS-232 Serial Port Operation in Rate/Total mode .........................15

5.3.6 RS-485 Serial Port Operation in Rate/Total mode .........................15

5.4 Batcher Operation .........................................................................................16

5.4.1 Batcher Configuration .....................................................................16

5.4.2 Password Protection for Batcher mode ..........................................17

5.4.3 Relay Operation in Batcher mode .................................................. 17

5.4.4 Pulse Output in Batcher mode....................................................... 17

5.4.5 Analog Output in Batcher mode...................................................... 17

5.4.6 RS-232 Serial Port Operation in Batcher mode............................. 18

5.4.7 RS-485 Serial Port Operation in Batcher mode............................. 18

6. PROGRAMMING

6.1 Front Panel Operation Concept for Program Mode....................................... 19

6.2 EZ Setup ....................................................................................................... 20

6.3 Setup Menus .................................................................................................21

6.4 Setup Sub-Menus..........................................................................................22

6.4.1 SELECT EZ SETUP .......................................................................22

6.4.2 INSTRUMENT TYPE ...................................................................... 22

6.4.3 SELECT FLOW EQUATION ........................................................... 23

6.4.4 SETUP INDICATORS (Total) ..........................................................23

6.4.5 SETUP INDICATORS (Density) ..................................................... 23

6.4.6 SETUP INDICATORS (Rate) .......................................................... 24

6.4.7 SETUP INDICATORS (Temperature) ............................................. 24

6.4.8 SETUP FLOW INPUT (Pulse - Ain & PS (A=B)) ............................ 25

6.4.9 SETUP FLOW INPUT (Pulse - Quadrature, Qx1 or Qx2) .............. 26

6.4.10 SETUP FLOW INPUT (Analog) ....................................................27

6.4.11 SETUP AUX INPUT ......................................................................28

6.4.12 SET FLUID PROPERTIES ...........................................................29

6.4.13 SETUP PULSE OUTPUT .............................................................29

6.4.14 SETUP ANALOG OUTPUT ..........................................................30

6.4.15 SETUP RELAYS ........................................................................... 30

6.4.16 SETUP CONTROL INPUTS(RATE/TOTAL) ................................ 32

6.4.17 SETUP CONTROL INPUTS(BATCH) ...........................................32

6.4.18 SETUP REALTIME CLOCK(Time) ...............................................33

6.4.19 SETUP REALTIME CLOCK(Date)................................................33

6.4.20 SERIAL USAGE ........................................................................... 34

6.4.21 SET DATALOG/PRINT(Configure) ...............................................35

6.4.22 SET DATALOG/PRINT (Select_list) ............................................. 36

6.4.23 ADMINISTRATIVE SETUP ...........................................................36

6.4.24 SETUP NETWORK CARD ...........................................................37

CONTENTS

99579 08/21/03

CONTENTS

7. PRINCIPLE OF OPERATION

7.1 General..........................................................................................................38

7.2 Orifice Flowmeter Considerations .................................................................38

7.3 Flow Equations ..............................................................................................38

7.4 Calculating the Expansion Factor.................................................................. 41

7.5 Computation of Viscosity Coef. A and B ........................................................42

7.6 Linearization Table ........................................................................................43

7.6.1 Linearization Table General Information .........................................43

7.6.2 Linearization Table for Pulse Inputs ................................................43

7.6.3 Linearization Table for Analog Inputs .............................................. 43

7.6.4 Linearization Table Interpolation .....................................................43

8. TEST, SERVICE and MAINTENANCE

8.1 Test Menus ....................................................................................................44

8.2 Test Sub-Menus ............................................................................................ 45

8.2.1 Audit Trail ........................................................................................45

8.2.2 Error History ................................................................................... 45

8.2.3 Print System Setup .........................................................................45

8.2.4 Keypad test..................................................................................... 46

8.2.5 Display test .....................................................................................46

8.2.6 Calibrate CH1 0mA......................................................................... 47

8.2.7 Calibrate CH1 20mA ....................................................................... 47

8.2.8 Calibrate CH2 0mA......................................................................... 48

8.2.9 Calibrate CH2 20mA ....................................................................... 48

8.2.10 Calibrate CH1 0V.......................................................................... 49

8.2.11 Calibrate CH1 10V........................................................................ 49

8.2.12 Calibrate CH2 0V.......................................................................... 50

8.2.13 Calibrate CH2 10V ........................................................................ 50

8.2.14 Calibrate 100 ohm RTD ................................................................50

8.2.15 Calibrate 4mA Out ........................................................................51

8.2.16 Calibrate 20mA Out ......................................................................51

8.2.17 Analog In Test ...............................................................................51

8.2.18 Pulse input test .............................................................................52

8.2.19 Analog out test.............................................................................. 52

8.2.20 Excitation out test .........................................................................52

8.2.21 Pulse out test ................................................................................53

8.2.22 Relay test..................................................................................... 53

8.2.23 Control input test .......................................................................... 53

8.2.24 Battery Voltage test ......................................................................54

8.2.25 Data logger utility ..........................................................................54

8.3 Internal Fuse Replacement ...........................................................................55

9. RS-232 SERIAL PORT

9.1 RS-232 Serial Port Description ..................................................................... 56

9.2 Instrument Setup by PC Over Serial Port...................................................... 56

9.3 Operation of Serial Communication Port with Printers ..................................56

9.4 FC-21 RS-232 Port Pinout ............................................................................ 56

10. RS-485 SERIAL PORT

10.1 RS-485 Serial Port Description ................................................................... 57

10.2 General........................................................................................................57

10.3 Operation of Serial Communication Port with PC ....................................... 57

10.4 FC-21 RS-485 Port Pinout .......................................................................... 57

11. FLOW COMPUTER SETUP SOFTWARE

11.1 System Requirements .................................................................................58

11.2 Cable and Wiring Requirements.................................................................. 58

11.3 Installation for Windows™3.1 or 3.11 ..........................................................58

11.4 Using the Flow Computer Setup Software ..................................................59

11.5 File Tab ........................................................................................................ 59

11.6 Setup Tab .....................................................................................................59

11.7 View Tab ...................................................................................................... 60

11.8 Misc. Tab ......................................................................................................60

12. GLOSSARY OF TERMS

12 Glossary Of Terms ..........................................................................................61

13. DIAGNOSIS AND TROUBLESHOOTING

13.1 Response of FC-21 on Error or Alarm:........................................................ 65

13.2 Diagnosis Flow Chart and Troubleshooting................................................. 66

13.3 Error & Warning Messages: ........................................................................67

13.3.1 Sensor/Process Alarms ................................................................67

13.3.2 Self Test Alarms ............................................................................68

APPENDIX A

Setup Menus .......................................................................................................69

FC-21 Flow Computer

Unit Description 1. Description

1.1 Unit Description:

The FC-21 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 easy to understand format. Single key direct access to measurements and display scrolling is supported.

The versatility of the FC-21 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 application 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 FC-21 Flow Computer offers the following features:

• Custody Transfer with Audit Trail

• Multiple Instrument Functions

• Menu Selectable Hardware & Software Features

• Two Line LCD or VFD Display

• Foreign Language Options

• Isolated Outputs Standard

• Versatile RS-232 Port Standard

• DIN Enclosure with Two Piece Connector

• Optional Networking Cards

• Advanced Batching Features

Unit Features

FC-21 Flow Computer

1.3 Specifications:

Specifications: Environmental

Indoor Use Altitude up to 2000m Operating Temperature: 0°C to +50°C

(-20°C to 55°C optional) Storage Temperature: -40°C to +85 C Maximum Relative Humidity : 80% for temperatures

up to 31°C decreasing linearly to 50% RH at

40°C Mains 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 Types: Backlit LCD or 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

Enclosure

Size: See Dimensions 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. Order Option 1: 110VAC: 85 to 127 Vrms, 50/60 Hz Order Option 2: 220VAC: 170 to 276 Vrms, 50/60 Hz Order Option 3: 12VDC: 10.5 to 14 VDC Order Option 4: 24VDC: 18 to 24 VDC

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.

Pulse Inputs:

Number of Flow Inputs: one Configurations supported: single input with or

without quadrature (menu selectable)

Input Impedance: 10 KΩ nominal Pullup Resistance: 10 KΩ to 5 VDC (menu

selectable)

Pull Down Resistance: 10 KΩ 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)

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/C 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

Available 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

Control Inputs

Switch Inputs are menu selectable for Start, Stop, Reset, Lock, Inhibit, Alarm Acknowledge, Print or Not Used. 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 KΩ Control Activation: Positive Edge or Pos. Level based on product definition

Excitation Voltage

110/220 VAC Powered Units

Menu Selectable: 5, 12 or 24 VDC @ 100mA

24 VDC Powered Units

Menu Selectable: 5 or 12 VDC @ 100mA

12 VDC Powered Units

5 VDC @ 100mA

FC-21 Flow Computer

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 (4 optional) 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. RS-232:

Device ID: 01-99 Baud Rates: 300, 600, 1200, 2400, 4800, 9600,

19200 Parity: None, Odd, Even Handshaking: None, Software, Hardware Print Setup: Configurable print list and formatting

RS-485:

Device ID: 01-247 Baud Rates: 300, 600, 1200, 2400, 4800, 9600,

19200 Parity: None, Odd, Even Protocol: Modbus RTU (Half Duplex)

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/C 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 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 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 ConditionsIn 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.

Step 6: Check Flow Alarms-

The flow alarm functions have been assigned to one of the above flow rates during the setup of the instrument. A 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.

FC-21 Flow Computer

Setup Mode

The setup mode is password protected by means of a numeric lock out code established by the user. In addition, a secret, manufacturers numeric unlock entry sequence is available.

The system also provides a minimum implementation 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 for 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 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.

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 FC-21 is the Test and Calibration Mode for the device. This mode provides a number of specialized utilities required for factory calibration, instrument checkout on startup, 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 FC-21 has a general purpose RS-232 Port which may be used for any one of the following purposes:

Transaction Printing Data Logging Internal Datalog Dumps Remote Metering by Modem (optional) 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 FC-21 that enables the user to rapidly configure the FC21 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.

FC-21 Flow Computer

Operation of Serial Communication Port with Printers

FC-21’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 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.

Operation of Serial Port with Modems (optional)

The FC-21 RS-232 channel supports a number of operating modes. One of these modes is intended to support operation with a modem in remote metering applications. FC-21’s role is that of DTE effecting file transfers under common file transfer protocols.

An external modem is intentionally being used with the FC-21. This permits use with the variety of modem standards worldwide while avoiding the specialized approvals required for equipment that is deemed to fall under the category of telecommunication equipment.

In the modem mode, the FC-21 is assumed to be operating in a remote metering role. The FC-21 will support key items in the Hayes Compatible “AT” Command Set. In this role, the FC-21 will have the following special abilities:

0. Monitor the modem status as a task of the system

1. Instruct the modem to answer an incoming call ATA

2. Respond to the calling modem at a compatible baud rate and protocol

3. Perform error checking in conjunction with the modem

4. Monitor the status of the carrier

5. Terminate the telephone connection in event the connection is lost.

In addition, the FC-21 will be capable of initiating a call to a designed telephone number in the event of a metering malfunction.

FC-21 Flow Computer

FC-21

Bezel Adaptor

Gasket

Mounting Bracket

2. Installation

2.1 General Mounting Hints:

The FC-21 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 firmly to attach the bezel to the panel. 3 in. lb. of

torque must be applied and the bezel must be parallel to 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:

General Mounting Hints

Mounting Procedure

Mounting Bracket

Standard Mounting Bezel Kit Mounting

Dimensions

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

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP4PRE 13RATE2TOTAL

GRAND6SCROLL7PRE 28DENS

RATE TOTAL

267395.749

GPM GAL

147.43

6.15

(156)

0.5

(13)

0.28 (7.2)

0.4 (10)

FC-21 Flow Computer

3. Applications

3.1 Liquid Volume

Measurements:

A flowmeter measures the actual volume in a liquid line. A temperature 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.

Liquid Volume

Pulse Input; Average K-Factor

input frequency * time scale factor

Volume Flow =

K-Factor

Analog Input; Linear

Volume Flow = % input * Full Scale Flow

Liquid Volume Illustration

Calculations

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

Flowmeter

FC-21 Flow Computer

3.2 Corrected Liquid Volume

Measurements:

A flowmeter measures the actual volume in a liquid line. A temperature 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.

Corrected Liquid Volume

Volume Flow

As calculated in section 3.1

Corrected Volume Flow

(Temp. Transmitter)

Corrected Volume Flow = vol. flow * (1 - Therm.Exp.Coef. *(Tf-Tref))

Calculations

Corrected Liquid Volume Illustration

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

Flowmeter Temperature Transmitter

FC-21 Flow Computer

3.3 Liquid Mass

Measurements:

Actual volume is measured by the flow element (DP transmitter, Flowmeter). Temperature is measured by the temperature transmitter. A density 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.

Liquid Mass

Liquid Mass Illustration

Volume Flow

As calculated in section 3.1

Mass Flow

Mass Flow = volume flow * density

Calculations

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

Orifice Plate

with DP Transmitter

Temp./Dens.

Transmitter

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

Flowmeter Temp./Dens.

Transmitter

FC-21 Flow Computer

3.4 Batching

Measurements:

A flowmeter measures the actual volume in a liquid line. A temperature 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 (420mA) and serial outputs.

Batching

Batching Illustration

Calculations

Volume Flow

As calculated in section 3.1

Corrected Volume Flow

(Temp. Transmitter)

Corrected Vol. Flow = volume flow * (1 - Therm.Exp.Coef. *(Tf-Tref))

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

Flowmeter Temperature Transmitter

(Optional)

Solenoid Valve

FC-21 Flow Computer

4 WIRING

4.1 Typical Batcher Wiring:

13 PULSE OUTPUT +

PULSE OUTPUT -

ANALOG OUTPUT -

ANALOG OUTPUT +

RLY1

RLY2

AC LINE AC LINE24

18 COM 19 20 21 22

NO NC COM NO

14 15 16

17 NC

POWER IN

DC -

4-20 mA

COM RLY3

COM RLY4

26 27 28 29 30

NO NC

DC +

25 NC

PULSE IN 1 PULSE IN 2

DC OUTPUT

COMMON

RTD EXCIT + RTD SENS

RTD SENS -

CNTR IN 1 CNTR IN 2 CNTR IN 3 COMMON

---------

8 9 10 11 12

2 3 4 5 6 7

SEE USER MANUAL

COMP

Iin +

Vin + Iin +

Vin +

FLOW

FLOW SENSOR

115 VAC SOLENOID VALVE

MOV recommended

115 VAC

(+) V Signal

Common

StartStop

123456

Remote Counter

13 PULSE OUTPUT +

PULSE OUTPUT -

ANALOG OUTPUT -

ANALOG OUTPUT +

RLY1

RLY2

AC LINE AC LINE24

18 COM 19 20 21 22

NO NC COM NO

14 15 16

17 NC

POWER IN

DC -

4-20 mA

COM RLY3

COM RLY4

26 27 28 29 30

NO NC

DC +

25 NC

PULSE IN 1 PULSE IN 2

DC OUTPUT

COMMON

RTD EXCIT + RTD SENS

RTD SENS -

CNTR IN 1 CNTR IN 2 CNTR IN 3 COMMON

---------

8 9 10 11 12

2 3 4 5 6 7

SEE USER MANUAL

COMP

Iin +

Vin + Iin +

Vin +

FLOW

FLOW SENSOR

115 VAC

(+) V Signal

Common

123456

Remote Counter

100 Ohm DIN RTD

{ {

Alarm Relay 1

Alarm Relay 2

STRIP CHART

RECORDER

4.2 Typical Rate/Total Wiring:

Batcher Wiring

Rate / Total Wiring

FC-21 Flow Computer

4.3 Wiring In Hazardous Areas:

Examples using MLT787S+ Barrier (MTL4755ac for RTD)

1 2 3 4

4-20

Q/∆P

–

2 1

3 4

28V

Diode

24V Out

4-20mA In Common

4-20mA Flow

Transmitter

Hazardous Area Safe Area

Flow Input

Hazardous Area Safe Area

Temperature Input (4-20mA Transmitter)

4-20

–

1 2

4 3

28V

Diode

24V Out

4-20mA Temp.

Transmitter

4-20mA In

Common

Temperature Input (4-20mA Transmitter)

Hazardous Area Safe Area

Temperature Input (RTD)

4 5 6 7 8

1 2 3 4 5 6

7 8 9 10 11 12 13 14 15 16 17

Common

RTD Excite (+) RTD Sense (+) RTD Sense (–)

3-Wire RTD

Temperature Input (RTD)

FC-21 Flow Computer

5. UNIT OPERATION

5.1 Front Panel Operation Concept for Run Mode

The FC-21 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, PRE 1, 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 TOTAL Function 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 TOTAL Function 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, PRE 1 & PRE 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 ∆ ∇ keys to assign the line.

The PRINT key is used to print on demand. When the PRINT key is pressed, a user defined list of data (TOTAL, RATE, PRE 1, 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 TOTAL key (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 wile 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:

Operator = 0 Supervisor = 2000

How To Use On-Line Help

How To Use Function Keys

How To Clear The Totalizer

How To Clear The Grand Total

How To Enter Presets

How To Create a Scroll List

How To Use The Print Key

How To Use Special Batching Keys

How To Use The Menu Key

How To Acknowledge Alarms

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

FC-21 Flow Computer

5.2 General Operation

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/Totalizer Operation

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 (PRE 1 Key) Edit Preset 2 (PRE 2 Key)

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

Up to four relays are available (two standard) 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 PRE 1 or PRE 2 key on the front panel. Preset 3 and Preset 4 are accessible only through the setup menu.

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.

General Operation

Rate/Total Operation

Password Protection

(Rate/Total mode)

Relay Operation

(Rate/Total mode)

Pulse Output

(Rate/Total mode)

Analog Output

(Rate/Total mode)

FC-21 Flow Computer

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.

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 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).

RS-232 Serial Port

(Rate/Total mode)

5.3.6 RS-485 Serial Port (optional)

RS-485 Port Description:

The optional RS-485 card utilizes Modbus RTU protocol to access a variety of process parameters and totalizers. The Relays can be controlled via Modbus. In addition, action routines can be executed. For further information, contact factory and request RS-485 Protocol manual.

Operation of Serial Communication Port with PC

The flow computer's RS-485 channel supports a number of Modbus RTU commands. Modbus RTU drivers are available from third party sources for a variety of Man Machine Interface software for IBM compatible PC's.

The user reads and writes information from/to the RS-485 using the Modbus RTU commands. The FC-21 then responds to these information and command requests.

Process variables and totalizers are read in register pairs in floating point format. Time and date are read as a series of integer register values. Alarms are individually read as coils. Action routines are initiated by writing to coils.

RS-485 Serial Port

(Rate/Total mode)

FC-21 Flow Computer

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 (PRE 2) is reached, Relay 2 will drop out (this is ideal for flow slow down). When the Batch amount (PRE 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. This time can be set from 1 to 99 seconds.

Time Delay

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.

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.

Batcher Configuration

FC-21 Flow Computer

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

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

Up to four relays are available (two standard) 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 PRE 1 or PRE 2 key on the front panel. Preset 3 and Preset 4 are accessible only through the setup menu. Relays 3 and 4 can be assigned to trip according to rate, total, temperature, overrun or alarm. When Rate is selected the relays can be programmed for low or high alarms.

5.4.4 Pulse Output in Batcher mode

5.4.5 Analog Output in Batcher mode

Password Protection

(Batch mode)

Relay Operation

(Batch mode)

Pulse Output

(Batch mode)

Analog Output

(Batch mode)

FC-21 Flow Computer

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:

5.4.7 RS-485 Serial Port (optional)

RS-485 Port Description:

The optional RS-485 card utilizes Modbus RTU protocol to access a variety of process parameters and totalizers. Batches/Relays can be controlled remotely via Modbus. In addition, action routines can be executed. For further information, contact factory and request RS-485 Protocol manual.

Operation of Serial Communication Port with PC

The user reads and writes information from/to the RS-485 using the Modbus RTU commands. The FC-21 then responds to these information and command requests.

RS-232 Serial Port

(Batch mode)

RS-485 Serial Port

(Batch mode)

FC-21 Flow Computer

6. PROGRAMMING

6.1 Front Panel Operation Concept for Program Mode

The FC-21 is 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.

How To Make Mode Changes

How To Navigate Through Sub-Menu Groups

How To Select Program Choices

How To Enter Numeric Values

How To Enter Text Characters

STOP

START

–

TIME

CLEAR•MENU

ENTER

HELP

TEMP

PRE 1

RATE

TOTAL

GRAND6SCROLL7PRE 28DENS

+ 52 hidden pages

Omega FC-21 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual