Omega FMA 4000 - Manual

3 2.2 Electrical Connections FMA 4000 is supplied with a 15 pin “D” connector. Pin diagram is presented in Figure b-1. 2.2.1 Power Supply Connections The power supply requirements for FMA 4000 transducers are: 11 to 26 Vdc, (unipolar power supply) DC Power (+) --------------- pin 7 of the 15 pin “D”...

2.2.3 Communication Parameters and Connections The digital interface operates via RS485 (optional RS232) and provides access toapplicable internal data including: flow, CPU temperature reading, auto zero, total-izer and alarm settings, gas table, conversion factors and engineering units selec-tion, ...

5 PIN FMA 4000 FUNCTION 1 Common, Signal Ground For Pin 2 (4-20 mA return). 2 0-5 Vdc or 4-20mA Flow Signal Output. 3 Relay No. 2 - Normally Open Contact. 4 Relay No. 2 - Common Contact. 5 Common, Power Supply (- DC power for 11 to 26 Vdc). 6 Relay No. 1 - Common Contact. 7 Plus Power Supply(+ DC po...

3. PRINCIPLE OF OPERATION The stream of gas entering the Mass Flow transducer is split by shunting a smallportion of the flow through a capillary stainless steel sensor tube. The remainder ofthe gas flows through the primary flow conduit. The geometry of the primary con-duit and the sensor tube are ...

7 4. SPECIFICATIONS FLOW MEDIUM: Please note that FMA 4000 Mass Flow Meters are designed to work only with clean gases. Never try to measure flow rates of liquids with any FMA 4000. CALIBRATIONS: Performed at standard conditions [14.7 psia (101.4 kPa) and 70 F F (21.1 F C)] unless otherwise requeste...

CAUTION: Omega makes no expressed or implied guarantees of corrosion resistance of mass flow meters as pertains to different flow media reacting withcomponents of meters. It is the customers' sole responsibility to select the model suitable for a particular gas based on the fluid contacting (wetted)...

9 5. OPERATING INSTRUCTIONS 5.1 Preparation and Warm Up It is assumed that the Mass Flow Meter has been correctly installed and thor-oughly leak tested as described in section 2. Make sure the flow source is OFF.When applying power to a flow meter within the first two seconds, you will see onthe LCD...

10 During initial powering of the FMA 4000 transducer, the flow output signal will beindicating a higher than usual output. This is an indication that the FMA 4000transducer has not yet attained its minimum operating temperature. This conditionwill automatically cancel within a few minutes and the t...

11 5.3 FMA 4000 Parameters Settings 5.3.1 Engineering Units Settings The FMA 4000 Mass Flow Meter is capable of displaying flow rate with 23 differentEngineering Units. Digital interface commands (see paragraph 8.3 ASCII CommandSet “FMA 4000 SOFTWARE INTERFACE COMMANDS”) are provided to: - get curre...

The current Flow Alarm settings and status are available via digital interface (seeparagraph 8.3 ASCII Command Set “FMA 4000 SOFTWARE INTERFACE COM-MANDS”). 5.3.5 Relay Assignment Settings Two sets of dry contact relay outputs are provided to actuate user supplied equip-ment. These are programmable ...

15 The available K Factor settings are: • Disabled (K = 1). • Internal Index The index [0-35] from internal K factor table (see APPENDIX II). • User Defined User defined conversion factor. 5.3.7 Zero Calibration The FMA 4000 includes an auto zero function that, when activated, automatical-ly adjusts...

16 Figure b-6: FMA 4000 Screen in the beginning of Auto Zero procedure. The Auto Zero procedure normally takes 1 - 2 minutes during which time the DPZero counts and the Sensor reading changes approximately every 3 to 6 seconds. Figure b-7: FMA 4000 during the Auto Zero procedure. The nominal value f...

17 5.3.8 Self Diagnostic Alarm FMA 4000 series Mass Flow Meters are equipped with a self-diagnostic alarmwhich is available via multicolor LED, digital interface and on screen indication (fordevices with optional LCD). The following diagnostic events are supported: 5.4 Analog Output Signals configur...

18 Analog output signals of 0-5 Vdc and 4-20 mA are attained at the appropriate pins ofthe 15-pin “D” connector (see Figure b-1 ) on the side of the FMA 4000 transducer. Table VI Analog Output Jumper Configuration See APPENDIX IV for actual jumpers layout on the PCB. 6. MAINTENANCE 6.1 Introduction ...

19 6.2 Flow Path Cleaning Before attempting any disassembly of the unit for cleaning, try inspecting the flowpaths by looking into the inlet and outlet ends of the meter for any debris that maybe clogging the flow through the meter. Remove debris as necessary. If the flowpath is clogged, proceed wit...

20 7. CALIBRATION PROCEDURES 7.1 Flow Calibration Omega ® Engineerings' Flow Calibration Laboratory offers professional calibration support for Mass Flow Meters using precision calibrators under strictly controlledconditions. NIST traceable calibrations are available. Calibrations can also be per-fo...

22 Gas flow calibration parameters are separately stored in the Gas Dependent por-tion of the EEPROM memory for each of 10 calibration tables. See APPENDIX Ifor complete list of gas dependent variables. The FMA 4000 gas flow calibration involves building a table of the actual flow val-ues (indexes 1...

If a simple communication terminal is used for communication with the FMA 4000,then “MW” (Memory Write) command from the software interface commands setmay be used to adjust sensor value in the linearization table (see section 8.3 forcomplete software interface commands list). Memory Read “MR” comma...

25 Enter Backdoor mode by typing: !11,MW,1000,1[CR] Unit will respond with: !11,BackDoorEnabled: Y Disable DAC update by typing: !11,WRITE,4,D[CR] Unit will respond with: !11,DisableUpdate: D 7.3.2 Gas flow 0-5 Vdc analog output calibration 1. Install jumpers J7A, J7B and J7C on the PC board for 0-5...

26 Enable DAC update by typing: !11,WRITE,4,N[CR] Unit will respond with: !11,DisableUpdate: N Close BackDoor access by typing: !11,MW,1000,0[CR] Unit will respond with: !11,BackDoorEnabled: N 8. RS485 / RS232 SOFTWARE INTERFACE COMMANDS 8.1 General The standard FMA 4000 comes with an RS485 interfac...

33 UAR T Error Codes: 1 - Not Supported Command or Back Door is not enabled. 2 - Wrong # of Arguments. 3 - Address is Out of Range (MR or MW commands). 4 - Wrong # of the characters in the Argument. 5 - Attempt to Alter Write Protected Area in the EEPROM. 6 - Proper Command or Argument is not found....

34 9. TROUBLESHOOTING 9.1 Common Conditions Your FMA 4000 Digital Mass Flow Meter was thoroughly checked at numerousquality control points during and after manufacturing and assembly operations. Itwas calibrated according to your desired flow and pressure conditions for a givengas or a mixture of ga...

9.2 Troubleshooting Guide 35 NO . INDICATION LIKELY REASON SOLUTION 1 No zero reading after 15 min. warm up time and no flow condition. Embedded temperature has been changed. Perform Auto Zero Procedure (see section 5.3.6 “Zero Calibration”). 2 Status LED indicator and LCD Display remains blank when...

9.3 Technical Assistance OMEGA 7 Engineering will provide technical assistance over the phone to quali- fied repair personnel. Please call our Flow Department at 800-872-9436 Ext.2298. Please have your Serial Number and Model Number ready when you call. 37 Q O2 = Q a = Q r X K = 1000 X 0.9926 = 992....

38 INDEX NAME DATA TYPE NOTES 0 BlankEEPROM char[10] Do not modify. Table Revision [PROTECTED] 1 SerialNumber char[20] Serial Number [PROTECTED] 2 ModelNumber char[20] Model Number [PROTECTED] 3 SoftwareVer char[10] Firmware Version [PROTECTED] 4 TimeSinceCalHr float Time since last calibration in h...

40 INDEX NAME DATA TYPE NOTES 100 GasIdentifer char[20] Name of Gas [If not calibrated = “Uncalibrated”] 101 FullScaleFlow float Full Scale Range in l/min 102 StdTemp float Standard Temperature 103 StdPressure float Standard Pressure 104 StdDensity float Gas Standard Density 105 CalibrationGas char[...

41 INDEX ACTUAL GAS K FactorRelative to N 2 Cp [Cal/g] DENSITY [g/I] 0 Acetylene C2H2 0.5829 .4036 1.162 1 Air 1.000 0.24 1.293 2 Allene (Propadiene) C3H4 0.4346 0.352 1.787 3 Ammonia NH 3 .7310 .492 .760 4 Argon Ar 1.4573 .1244 1.782 5 Arsine AsH3 0.6735 0.1167 3.478 6 Boron Trichloride BCl3 0.4089...

42 APPENDIX III GAS FACTOR TABLE (“K FACTORS”)  CAUTION : K-Factors at best are only an approximation. K factors should not be used in applications that require accuracy better than +/- 5 to 10%. ACTUAL GAS K FACTOR Relative to N 2 Cp [Cal/g] Density [g/I] Acetylene C 2 H 2 .5829 .4036 1.162 Air 1....

46 APPENDIX IV COMPONENT DIAGRAM TOP COMPONENT SIDE Aug. 09, 2007

APPENDIX V DIMENSIONAL DRAWINGS FMA 4000 WITHOUT READOUT 48

WARRANTY/ DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for aperiod of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping...