Dwyer GFM User Manual

Technical Data Sheet No. TD9411M Rev. LDate of Issue: July 2009OPERATING MANUALFOR GFM MASS FLOW METERSP.O. Box 373Michigan City, IN 46361 USAPhone: (

6Dwyer makes no expressed or implied guarantees of corrosion resistance of mass flowmeters as pertains to different flow media reacting with component

7TABLE II GFM-113 MEDIUM FLOW MASS FLOW METERS*TABLE III GFM-1142 HIGH FLOW MASS FLOW METERS** Flow rates are stated for Nitrogen at STP conditions [i

85. OPERATING INSTRUCTIONS5.1 Preparation and Warm UpIt is assumed that the Mass Flow Meter has been correctly installed and thor-oughly leak tested a

5.3 Swamping ConditionIf a flow of more than 10% above the maximum flow rate of the Mass Flow Meteris taking place, a condition known as “swamping” ma

6.2.2 GFM-110 /111 ModelsUnscrew the inlet compression fitting of meter. Note that the Restrictor FlowElement (RFE) is connected to the inlet fitting.

11Remove the block and connected screens. Clean each of the removed parts as necessary. If alcohol is used for cleaning, allow time for drying.Inspec

FIGURE 7.A - CALIBRATION POTENTIOMETER AND JUMPER LOCATIONS7.2 Calibration of GFM Mass Flow MetersAll adjustments in this section are made from the

137.2.3 SPAN AdjustmentReconnect the gas source. Using the flow regulator, adjust the flow rate to 100% offull scale flow. Check the flow rate indicat

7.3.3 25% Flow AdjustmentReconnect the gas source. Using the flow regulator, adjust the flow rate to 25% offull scale flow. Check the flow rate indica

157.4.2 Adjust ScalingUsing a digital multimeter connected to either the 0 to 5 VDC or 4 to 20 mA sig-nal at the 9-pin “D” connector, set the flow rat

Dwyer reserves the right to make changes to information and specifications in thismanual without notice. CAUTION:This product is not intended to be u

16INDICATIONlack of reading or outputunstable or no zero readingfull scale output at “no flow”condition or with valveclosed calibration offLIKELY REAS

17INDICATIONNo zero reading after 15minute warm up time and noflow condition.No zero reading after 15minute warm up time and noflow condition. Display

18INDICATIONLCD Display reading doesnot correspond the correctflow range according analogoutput 0-5 Vdc signal. LCD Display reading and analog output

19INDICATIONLCD Display reading isabove maximum flow rangeand output voltage 0-5 Vdcsignal is more than 5.5 Vdcwhen gas flows through theGFM. Gas flow

20INDICATIONGFM is disconnected fromthe source of the gas (noflow conditions) but LCDDisplay reading is fluctuating in wide range.Output voltage 0-5 V

QO2 = Qa = Qr X K = 1000 X 0.9926 = 992.6 sccmwhere K = relative K factor to reference gas (oxygen to nitrogen)1d X Cpwhere d = gas densit

22APPENDIX 1COMPONENTS DIAGRAMGFM METERING PC BOARDPHONEJACK9-PIN“D”CONNECTORDC POWERJACK

APPENDIX 2 GAS FACTOR TABLE (“K” FACTORS)23 CAUTION: K-Factors at best are only an approximation. K factors should not be used in applications that

24ACTUAL GASK FACTORRelative to N2Cp[Cal/g]Density[g/I]Deuterium D21.00 1.722 1.799Diborane B2H6.4357 .508 1.235Dibromodifluoromethane CBr2F2.1947 .15

25ACTUAL GASK FACTORRelative to N2Cp[Cal/g]Density[g/I]Hydrogen Bromide HBr1.000 .0861 3.610Hydrogen Chloride HCl1.000 .1912 1.627Hydrogen Cyanide HCN

TABLE OF CONTENTS1. UNPACKING THE GFM MASS FLOW METER...1.1 Inspect Package for External Damage...

26ACTUAL GASK FACTORRelative to N2Cp[Cal/g]Density[g/I]Phosphorous Oxychloride POCl3.36 .1324 6.843Phosphorous Pentafluoride PH5.3021 .1610 5.620Phosp

27APPENDIX 3DIMENSIONAL DRAWINGSNOTE: Dwyer reserves the right to change designs and dimensions at its sole discretion at any time without notice. Fo

28APPENDIX 4NOTE: Follow Return Procedures In Section 1.3.WARRANTYDwyer Mass Flow Systems are warranted against parts and workmanship for a period of

7.3.6 100% Flow Adjustment...7.4 LCD Display Scaling...

11. UNPACKING THE GFM MASS FLOW METER1.1 Inspect Package for External DamageYour GFM Mass Flow Meter was carefully packed in a sturdy cardboard carton

2CAUTION: GFM TRANSDUCERS SHOULD NOT BE USED FOR MONITORING OXYGEN GAS UNLESS SPECIFICALLY CLEANED AND PREPARED FOR SUCH APPLICATION. For more inform

3PIN FUNCTION1 Remote LCD display signal2 0 to 5 VDC output indication3 0 to 5 VDC common4 Power supply, positive5 Power supply, common6 Remote LCD di

2.3.1 Remote LCD ReadoutsGFM Mass Flow Meters are available with optional remote reading LCD displayssupplied with a three foot long wire to accommo

4. SPECIFICATIONSFLOW MEDIUM: Please note that GFM 1101 thru 1145 Mass Flow Meters are designed towork with clean gases only. Never try to meter or co