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www .omega.com e-mail: info@omega.com U ser ’ s Guide FC-21 Flow Computer Shop online at 99579 08/21/03.
M2571/0803 Where Do I Find Ever ything I Need for Pr ocess Measurement and Control? OM EGA…Of Course! Shop online at www .omega.com TEMPERA TURE 䡺 ⻬ Thermocouple, RTD & Thermistor Probes, Co.
1. DESCRIPTION 1.1 Unit Description ............................................................................................... 1 1.2 Unit Features ...................................................................................................
CONTENTS ii 7. PRINCIPLE OF OPERA TION 7.1 General .......................................................................................................... 38 7.2 Orifice Flowmeter Considerations .....................................................
1 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.
2 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: -4.
3 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).
4 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.
5 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.
6 FC-21 Flow Computer FC-21 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.
7 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.
8 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.
9 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.
10 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.
11 FC-21 Flow Computer 4 WIRING 4.1 Typical Batcher Wiring: 13 PULSE OUTPUT + PULSE OUTPUT - ANALOG OUTPUT - ANALOG OUTPUT + RL Y1 RL Y2 AC LINE AC LINE 24 18 COM 19 20 21 22 23 NO NC COM NO 14 15 16 .
12 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 T ransmitte.
13 FC-21 Flow Computer 5. UNIT OPERA TION 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.
14 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).
15 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).
16 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.
17 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.
18 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).
19 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.
20 FC-21 Flow Computer 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 TOTAL VOLUME UNITS gal .
21 FC-21 Flow Computer 6.3 Setup Menus 6.3.1 Top Level Setup Menu Menus Display Notes 6.3.2 Submenu Groups SELECT OPERATE STATE Run Setup Test SELECT EZ SETUP INSTRUMENT TYPE SELECT FLOW EQUATION SETU.
22 FC-21 Flow Computer Notes Display Sub-menus 6.4 Setup Sub-Menus Refer to page 20 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 sub- menus.
23 FC-21 Flow Computer ENTER ENTER ENTER ENTER Sub-menus Display Notes Press ENTER to enter Select Flow Equation submenus. Press ENTER when desired flow equation is flashing.
24 FC-21 Flow Computer Sub-menus Display Notes 6.4.7 SETUP INDICATORS (Temperature) 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.
25 FC-21 Flow Computer 6.4.8 SETUP FLOW INPUT (Pulse - Ain & PS (A=B)) SETUP FLOW INPUT EXCITATION VOLTAGE 5v 12v 24v FLOW INPUT TYPE Pulse Analog PULSE INPUT TYPE Ain PS(A=B) Qx1 Qx2 PULSE TRIGGER LEVEL 10mV 100mV 2.
26 FC-21 Flow Computer 6.4.9 SETUP FLOW INPUT (Pulse - Quadrature, Qx1 or Qx2) SETUP FLOW INPUT EXCITATION VOLTAGE 5v 12v 24v FLOW INPUT TYPE Pulse Analog PULSE INPUT TYPE Ain PS(A=B) Qx1 Qx2 PULSE TRIGGER LEVEL 10mV 100mV 2.
27 FC-21 Flow Computer Sub-menus Display Notes 6.4.10 SETUP FLOW INPUT (Analog) SETUP FLOW INPUTS EXCITATION VOLTAGE 5v 12v 24v FLOW INPUT TYPE Pulse Analog ANALOG SIGNAL TYPE Voltage Current ANALOG V.
28 FC-21 Flow Computer Sub-menus Display Notes 6.4.11 SETUP AUX INPUT NOTE: When Density (Dens) is selected, The menu prompts will be very similar to the Tem- perature prompts.
29 FC-21 Flow Computer Sub-menus Display Notes 6.4.12 SET FLUID PROPERTIES SET FLUID PROPERTIES REF. DENSITY ###### lbs/g REF. TEMPERATURE ###### F EXPAN. FACTOR [xe-6] ######## CALIBRATION DENSITY ######## VISCOSITY COEF. A 0.000 VISCOSITY COEF. B 0.
30 FC-21 Flow Computer SETUP RELAYS Rly1 Rly2 Rly3 Rly4 RELAY 1 USAGE RATE TOTAL NA RELAY 1 DELAY sec 0 RELAY 1 MODE LO_ALARM HI_ALARM RELAY 1 DURATION ##### RELAY 1 SETPOINT ####### gal RELAY 1 HYSTERESIS ##### gal/m Advance T o SETUP RELAYS 3, 4 Sub-menus Display Notes 6.
31 FC-21 Flow Computer ENTER ENTER ENTER ENTER ENTER 6.4.15 (Continued) SETUP RELAYS (Relay 3 & Relay 4) ENTER SETUP RELAYS Rly1 Rly2 Rly3 Rly4 RELAY 3 USAGE Rate Tot Aux Ovrn NA RELAY 4 USAGE Rat.
32 FC-21 Flow Computer Sub-menus Display Notes 6.4.16 SETUP CONTROL INPUTS (RATE/TOTAL) Press Enter to begin setup of the Control Inputs. Select the desired Control Input for setup. If Control Input 1 Selected, Select Inhibit Total or NA (Not Assigned).
33 FC-21 Flow Computer ENTER ENTER ENTER ENTER ENTER ENTER ENTER.
34 FC-21 Flow Computer Sub-menus Display Notes ENTER ENTER ENTER ENTER 6.4.20 SERIAL USAGE ENTER ENTER SERIAL USAGE SERIAL HARDWARE RS232 RS485 DEVICE ID ## BAUD RATE 300 600 1200 <more> BAUD RA.
35 FC-21 Flow Computer ENTER ENTER CALL ON ERROR/ALARM No Yes NUMBER OF REDIALS 0 HANGUP IF 2MIN INACT No Yes Advance T o SETUP DATALOG/PRINT SETUP DATALOG/PRINT SETUP DATALOG/PRINT Config Select_list.
36 FC-21 Flow Computer Sub-menus Display Notes ADMINISTRATIVE SETUP OPERATOR PASSWORD ***** SUPERVISOR PASSWORD ***** SOFTWARE VERSION vxx.xx PRODUCT ORDER CODE FC-21xxxxxxx UNIT SERIAL NUMBER 00000 SENSOR SERIAL NUMBER 00000 Advance T o SETUP NETWORK CARD Press Enter to begin Administrative Setup.
37 FC-21 Flow Computer 6.4.24 SETUP NETWORK CARD (optional) ENTER ENTER ENTER ENTER SETUP NETWORK CARD SELECT NTW PROTOCOL ModbusRTU NETWORK DEVICE ID 1 BAUD RATE 2400 4800 9600 19200 PARITY None Odd Even Advance T o SELECT EZ SETUP? Press Enter to setup Network Card Select desired Network Protocol.
38 FC-21 Flow Computer 7. Principle Of Operation 7.1 General: The FC-21 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.
39 FC-21 Flow Computer 7.3 Flow Equations: (Continued) Flow Equations Input Viscosity Computation: Uncompensated Flow Computation: Pulse Input; Average K-Factor input frequency * time scale factor Vol.
40 FC-21 Flow Computer 7.3 Flow Equations: (Continued) Flow Equations The above information was obtained from "Flow Measurement Engineering Handbook, 3rd Edition" by Richard W Miller.
41 FC-21 Flow Computer 7.4 Calculating the Expansion Factor The liquid density is a function of the flowing temperature for many fluids. This unit solves an equation which represents this physical property of the fluid.
42 FC-21 Flow Computer 7.5 Computation of Viscosity Coef. A and B The flow computer solves an equation which computes the viscosity as a function of temperature. Two parameters must be entered for this calculation to be performed. These are the setup parameters Viscosity Coef.
43 FC-21 Flow Computer 7.6 Linearization Table 7.6.1 Linearization Table General Information 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.
44 FC-21 Flow Computer SELECT OPERATE STATE Run Setup Test Audit Trail Error history Print System Setup Keypad Test Display test Calibrate Analog In Test Pulse input test Analog out test Excitation out test Pulse out test Relay Test Control inputs test Battery Voltage Test Data logger utility 8.
45 FC-21 Flow Computer 8.2 Test Sub-Menus MENU Press Enter to view the audit trail information. The audit trail is viewed in this format: nnnnn= number of critical menu changes, hh:mm:ss; mm/dd/yy = time and date of last change. Press Menu to get back to audit trail top-level menu.
46 FC-21 Flow Computer Sub-menus Display Notes 8.2.4 Keypad test Submenu Group 8.2.5 Display test Submenu Group MENU ENTER Keypad test Keypad test Key pressed—> ENTER Keypad test Display test 000.
47 FC-21 Flow Computer Sub-menus Display Notes Calibrate Calibrate ch1 0mA Iin=TB1-3 GND=TB1-4 Calibrate ch1 0mA CALIBRATING —— Calibrate ch1 0mA *** DONE *** Calibrate ch1 0mA Iin=TB1-3 GND=TB1-4.
48 FC-21 Flow Computer 8.2.8 Calibrate CH2 0mA Submenu Group 8.2.9 Calibrate CH2 20mA Submenu Group Calibrate ch2 0mA Iin=TB1-8 GND=TB1-4 Calibrate ch2 0mA 0 CALIBRATING —— Calibrate ch2 0mA *** D.
49 FC-21 Flow Computer Sub-menus Display Notes Calibrate ch1 0V Vin=TB1-2 GND=TB1-4 Calibrate ch1 0V 0 CALIBRATING —— Calibrate ch1 0V *** DONE *** Calibrate ch1 0V Iin=TB1-2 GND=TB1-4 Calibrate c.
50 FC-21 Flow Computer Sub-menus Display Notes 8.2.12 Calibrate CH2 0V Submenu Group Calibrate ch2 0V Vin=TB1-5 GND=TB1-4 Calibrate ch2 0V 0 CALIBRATING —— Calibrate ch2 0V *** DONE *** Calibrate .
51 FC-21 Flow Computer MENU Sub-menus Display Notes 8.2.15 Calibrate 4mA Out Submenu Group 8.2.16 Calibrate 20mA Out Submenu Group ENTER ENTER ENTER ENTER STOP ENTER STOP STOP MENU Calibrate 0mA out + TB1-15 - TB1-16 Calibrate 0mA out Enter mA: 0.
52 FC-21 Flow Computer Sub-menus Display Notes Pulse input test Pulse input test Trigger level 2.5V Pulse input test count speed 3kHz Pulse input test F1: 0 F2: 0 Pulse input test Analog out test Anal.
53 FC-21 Flow Computer Sub-menus Display Notes Pulse out test Pulse out test *0Hz 1Hz 10Hz 20Hz Pulse out test Relay Test Rly1 Rly2 Rly3 Rly4 Off Off Off Off Relay Test Control inputs test TB1-9 TB1-10 TB1-11 Off Off Off Control inputs test 8.2.21 Pulse out test Submenu Group ENTER MENU Press Enter key to test the pulse output.
54 FC-21 Flow Computer Battery Voltage Test Battery Voltage Test 3.312 Volts Battery Voltage Test Data logger utility Data logger utility Log 10 958 Max Data logger utility Log 00001 PRT CLR Data logger utility 8.2.24 Battery Voltage test Submenu Group 8.
55 FC-21 Flow Computer 8.3 Internal Fuse Replacement Instructions: 1. Make sure you follow proper E.S.D. Precautions. All persons performing this replacement must follow proper grounding procedures. 2. T urn the power to the unit off. 3. Disconnect the two piece connector rear terminal block, leaving all connections in place.
56 FC-21 Flow Computer 9. RS-232 Serial Port 9.1 RS-232 Port Description: The FC-21 has a general purpose RS-232 Port which may be used for any one of the following purposes: Transaction Printing Data.
57 FC-21 Flow Computer 10. RS-485 Serial Port (optional) 10.1 RS-485 Port Description: The FC-21 has a an optional general purpose RS-485 Port which may be used for any one of the following purposes: Accessing Process Parameters Rate, Temperatures, Density, Setpoints, Month, Day, Year, Hour, Minutes, Seconds, etc.
58 FC-21 Flow Computer 1 1. Flow Computer Setup Software The FC-21 setup program provides for configuring, monitoring and controlling a FC- 21 unit. Sample applications are stored in disk files.
59 FC-21 Flow Computer 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.
60 FC-21 Flow Computer 11.7 View Tab 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.
61 FC-21 Flow Computer 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.
62 FC-21 Flow Computer 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.
63 FC-21 Flow Computer Mass Flow is inferred by the volumetric flow and density (or implied density) of a fluid. Maximum Batch Preset The Maximum Batch Preset allows the user to program the Maximum Batch value allowed to be entered by the operator.
64 FC-21 Flow Computer 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.
65 FC-21 Flow Computer 13. Diagnosis and T roubleshooting 13.1 Response of FC-21 on Error or Alarm: TYPE OF ERROR DESCRIPTION Sensor/Process Alarms Errors detected due to sensor failure or process alarm conditions Self Test Errors Errors detected during self test.
66 FC-21 Flow Computer 13.2 Diagnosis Flow Chart and Troubleshooting Is there an input power supply voltage across Terminals 23 and 24? No Yes Check the connections according to the circuit diagrams. Check junction box fuses. Is the Display Backlight Visible? No Yes Check/Replace internal fuse.
67 FC-21 Flow Computer Cause Displayed when totalizer rolls over 4-20 mA Input current at aux input smaller than 3.5 mA: • Faulty Wiring • Transmitter not set to "4-20 mA" • Transmitter defective Input current at RTD input too low: • Faulty wiring • RTD defective Pulse counter overflowed.
68 FC-21 Flow Computer 13.3 Error & Warning Messages: (Continued) Cause Analog input signal of the flow input exceeded by more than 3%: • Sensor overranged • Incorrect full scale setting of fl.
69 FC-21 Flow Computer AUX INPUT TYPE VOL T AGE/ CURRENT RANGE AUX. DEF AUL T AUX LOW SCALE DENS EXTRACT METHOD SETUP AUX INPUT AUX SIGNAL TYPE AUX HIGH ALARM AUX FULL SCALE SETUP INDICA TORS TOTAL DE.
W ARRANTY / DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OME GA ’ s W ARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time.
Servicing Nor th America: USA: One Omega Drive, P.O. Box 4047 ISO 9001 Certified Stamford CT 06907-0047 TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1 TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.
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