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Dwyer Instruments GFM--1101 Operating Manual

Gfm mass flow meters
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Technical Data Sheet No. TD9411M Rev. V
Date of Issue:
November 2024
OPERATING MANUAL
FOR GFM MASS FLOW METERS
P.O. Box 373
Michigan City, IN 46361 USA
Phone: (219) 879-8000
e-mail: info@dwyer.com
Internet: http://www.dwyer-inst.com
FAX: (219) 879-9057

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Summary of Contents for Dwyer Instruments GFM--1101

  • Page 1 Technical Data Sheet No. TD9411M Rev. V Date of Issue: November 2024 OPERATING MANUAL FOR GFM MASS FLOW METERS P.O. Box 373 Michigan City, IN 46361 USA Phone: (219) 879-8000 e-mail: info@dwyer.com Internet: http://www.dwyer-inst.com FAX: (219) 879-9057...
  • Page 2 CAUTION: This product is not intended to be used in life support applications! 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%. Dwyer reserves the right to make changes to information and specifications in this manual without notice.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS 1. UNPACKING THE GFM MASS FLOW METER......... Inspect Package for External Damage..........Unpack the Mass Flow Meter............... Returning Merchandise for Repair............2. INSTALLATION..................Primary Gas Connections............... Electrical Connections..............2.3.1 Remote LCD Readouts..............2.3.2 Panel Mounting Readouts............... 3. PRINCIPLE OF OPERATION..............4.
  • Page 4 7.3.6 50% Flow Adjustment..............7.3.7 75% Flow Adjustment..............7.3.8 100% Flow Adjustment..............LCD Display Scaling................. 7.4.1 Access LCD Display Circuit.............. 7.4.2 Adjust Scaling.................. 7.4.3 Change Decimal Point..............8. TROUBLESHOOTING................Common Conditions................ Troubleshooting Guide..............Technical Assistance............... 9. CALIBRATION CONVERSIONS FROM REFERENCE GASES....... APPENDIX 1 COMPONENT DIAGRAM............

  • Page 5: Unpacking The Gfm Mass Flow Meter

    UNPACKING THE GFM MASS FLOW METER Inspect Package for External Damage Your GFM Mass Flow Meter was carefully packed in a sturdy cardboard carton, with anti-static cushioning materials to withstand shipping shock. Upon receipt, inspect the package for possible external damage. In case of external damage to the package contact the shipping company immediately.

  • Page 6: Installation

    INSTALLATION Primary Gas Connections Please note that the GFM Mass Flow Meter will not operate with liquids. Only clean gases are allowed to be introduced into the instrument. If gases are contaminated they must be filtered to prevent the introduction of impediments into the sensor. CAUTION: IT IS THE USERS RESPONSIBILITY TO DETERMINE IF THE INSTRUMENT IS APPROPRIATE FOR THEIR OXYGEN APPLICATION, AND FOR SPECIFYING O2 CLEANING SERVICE IF REQUIRED.

  • Page 7: Pin Function

    CAUTION: WIRING THE GFM METER WITH THE POWER ON MAY RESULT IN INTERNAL DAMAGE! PLEASE MAKE ALL WIRING CONNECTIONS BEFORE SWITCHING ON THE POWER. All GFM models require power supplies with nominal current rating of at least 200 mA. The operating power input is supplied via the DC power jack or the 9- pin “D”...

  • Page 8: Important Notes

    IMPORTANT NOTES: In general, “D” Connector numbering patterns are standardized. There are, how- ever, some connectors with nonconforming patterns and the numbering sequence on your mating connector may or may not coincide with the numbering sequence shown in our pin configuration table above. It is imperative that you match the appropriate wires in accordance with the correct sequence regardless of the par- ticular numbers displayed on your mating connector.

  • Page 9: Principle Of Operation

    2.3.2 Panel Mounting Readouts Another option for the GFM Mass Flow Meter is the Panel Mounting Remote Readout. In this configuration the LCD readout is supplied with a three foot long extension wire, and no aluminum housing around the LCD. The LCD readout for panel mounting includes a bezel with two plastic screws which conveniently fit into a rectangular cut-out for panel mounting (see Figure 2.b).

  • Page 10: Specifications

    SPECIFICATIONS FLOW MEDIUM: Please note that GFM 1101 thru 1145 Mass Flow Meters are designed to work with clean gases only. Never try to meter or control flow rates of liquids with any GFM's. CALIBRATIONS: Performed at standard conditions [14.7 psia (1.01 bars) and 70 (21.1 C)] unless otherwise requested or stated.

  • Page 11: Wetted Materials

    Power input is protected by a 750 mA (GFM models with serial numbers below 340621-1) or 300 mA (GFM models with serial numbers above 340621-1) M (medium time-lag) reset- table fuse, and a rectifier diode for polarity protection. WETTED MATERIALS: GFM-110 thru 1145: Anodized aluminum, brass, and 316 stainless steel with FKM O-rings seals;...

  • Page 12: Flow Ranges

    FLOW RANGES TABLE I GFM-110 /111 TABLE II GFM-113 MEDIUM FLOW MASS LOW FLOW MASS FLOW METERS* FLOW METERS* liters/min [N CODE scc/min [N CODE 0 to 10 GFM-1101 /2101 GFM-1111 /2111 0 to 15 GFM-1102 /2102 0 to 20 GFM-1130 /2130 GFM-1103 /2103 0 to 50...

  • Page 13: Operating Instructions

    OPERATING INSTRUCTIONS 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. Apply power to the unit by plugging the power supply line into the DC power jack (or 9-pin 'D' connector) on the side of the meter.

  • Page 14: Swamping Condition

    Swamping Condition If a flow of more than 10% above the maximum flow rate of the Mass Flow Meter is taking place, a condition known as “swamping” may occur. Readings of a “swamped” meter cannot be assumed to be either accurate or linear. Flow must be restored to below 110% of maximum meter range.

  • Page 15: Gfm-110 Models

    6.2.2 GFM-110 Models Unscrew both the inlet & outlet compression fittings from the meter using an 11/16" open box wrench. Unscrew the RFE sub ass’y from the unit’s inlet side using a flat 1/2" wide screwdriver. Push a pin/ screw driver dia 3/32-1/8" thru the adapter’s holes, then unscrew a retaining nut using a 1/4"...

  • Page 16: Calibration Procedures

    ANY ADJUSTMENTS MADE TO THE METER, AS DESCRIBED IN THIS SECTION, WILL VOID ANY CALIBRATION WARRANTY APPLICABLE. Flow Calibration Dwyer Instruments' Flow Calibration Laboratory offers professional calibration support for Mass Flow Meters, using precision calibrators under strictly controlled conditions. NIST traceable calibrations are available. Calibrations can also be per- formed at customers' site using available standards.
  • Page 17 The calibration can then be corrected to the appropriate gas desired based on rel- ative correction [K] factors shown in the gas factor table - see Appendix 2. A ref- erence gas, other than nitrogen, may be used to better approximate the flow char- acteristics of certain gases.

  • Page 18: Calibration Of Gfm Mass Flow Meters

    Calibration of GFM Mass Flow Meters All adjustments in this section are made from the outside of the meter, there is no need to disassemble any part of the instrument. GFM Mass Flow Meters may be field recalibrated /checked for the same range they were originally factory calibrated for.

  • Page 19: Linearity Adjustment

    See also section 8. TROUBLESHOOTING. If after attempting to remedy the above conditions, a malfunction still persists, return the meter for factory service, see section 1.1. At this point the calibration is complete. However, it is advisable that several additional points between 0 and 100%, such as 25%, 50%, and 75% flow be checked.

  • Page 20: 10% Flow Adjustment

    7.3.4 10% Flow Adjustment Using the flow regulator, adjust the flow rate to 10% of full scale flow according to the calibrator. Check the flow rate indicated against the flow calibrator. Adjust the setting for potentiometer [R33] by using the insulated screwdriver through the access win- dow, until the output of the flow meter reads 0.5VDC ±63mV (or 5.6mA ±0.25mA).

  • Page 21: Access Lcd Display Circuit

    Re-calibration for a new flow range or different engineering units are two exam- ples of when this may be necessary. 7.4.1 Access LCD Display Circuit Carefully remove the LCD from the GFM or panel mounted surface. Remove the aluminum housing on the side of the connection cable. Slide the LCD assembly out of the aluminum housing.

  • Page 22: Troubleshooting Guide

    Troubleshooting Guide INDICATION LIKELY REASON REMEDY lack of reading or output power supply off check connection of power supply fuse blown disconnect GFM transducer from power supply; remove the shorting condition or check polarities; fuse resets automatically filter screen flush clean or disassemble to obstructed at inlet remove impediments or replace occluded sensor tube...
  • Page 23 INDICATION LIKELY REASON REMEDY No zero reading after 15 Embedded temperature Readjust ZERO minute warm up time and has been changed. potentiometer R34 through no flow condition. the access hole (see page 14 for details). No zero reading after 15 Power supply voltage is Measure voltage on pins 4 minute warm up time and...
  • Page 24 INDICATION LIKELY REASON REMEDY LCD Display reading does Readjust LCD Display LCD Display is adjusted for not correspond the correct wrong flow range or scaling for required full scale flow range according analog engineering units. flow (see 7.4 on page 16). output 0-5 Vdc signal.
  • Page 25 LIKELY REASON INDICATION REMEDY LCD Display reading is Sensor under swamping Lower the flow through GFM above maximum flow range conditions (flow is more within calibrated range or than 10% above maximum and output voltage 0-5 Vdc shut down the flow com- signal is more than 5.5 Vdc flow rate for particular pletely.

  • Page 26: Technical Assistance

    See section 1.3 for return procedures. 8.3 Technical Assistance Dwyer Instruments will provide technical assistance over the phone to qualified repair personnel. Please call our Technical Assistance at (219)-879-8000. Please have your Serial Number and Model Number ready when you call.

  • Page 27: Calibration Conversions From Reference Gases

    CALIBRATION CONVERSIONS FROM REFERENCE GASES The calibration conversion incorporates the K factor. The K factor is derived from gas density and coefficient of specific heat. For diatomic gases: d X C where d = gas density (gram /liter) = coefficient of specific heat (cal /gram) Note: In the above relationship that d and Cp are usually chosen at the same conditions (standard, normal or other).
  • Page 28 GFM METERING PC BOARD...

  • Page 29: Appendix 2 Gas Factor Table ("K" Factors)

    APPENDIX 2 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%. K FACTOR Density ACTUAL GAS Relative to N [Cal/g] [g/I] Acetylene C...
  • Page 30 Density K FACTOR ACTUAL GAS [Cal/g] [g/I] Relative to N 1.00 1.722 1.799 Deuterium D .4357 .508 1.235 Diborane B .1947 9.362 Dibromodifluoromethane CBr .3538 .1432 5.395 Dichlorodifluoromethane (Freon-12) CCl .4252 .140 4.592 Dichlofluoromethane (Freon-21) CHCl .2522 .1882 5.758 Dichloromethylsilane (CH SiCl .4044 .150...
  • Page 31 Density K FACTOR ACTUAL GAS [Cal/g] [g/I] Relative to N 1.000 .0861 3.610 Hydrogen Bromide HBr 1.000 .1912 1.627 Hydrogen Chloride HCl .764 .3171 1.206 Hydrogen Cyanide HCN .9998 .3479 .893 Hydrogen Fluoride HF .9987 .0545 5.707 Hydrogen Iodide HI .7893 .1025 3.613...
  • Page 32 K FACTOR Density ACTUAL GAS Relative to N [Cal/g] [g/I] .1324 6.843 Phosphorous Oxychloride POCl .3021 .1610 5.620 Phosphorous Pentafluoride PH .1250 6.127 Phosphorous Trichloride PCl .399 1.967 Propane C .366 1.877 Propylene C .5982 .3189 1.433 Silane SiH .284 .1270 7.580 Silicon Tetrachloride SiCl...

  • Page 33: Appendix 3 Dimensional Drawings

    APPENDIX 3 DIMENSIONAL DRAWINGS GFM 1101 to 1109, 1111 to 1133 and 1142 2.88 2.36 NO LCD VERSION 0.95 1.10 0.69 2.69 DIMENSION INCH (MM) CONNECTION MOUNTING LCD VERSION MODEL COMPRESSION HOLE FITTING GFM 1101 5.72 1.00 1.13 3.09 5.10 4.61 0.16 0.16...
  • Page 34 GFM 1143, 1144 and 1145 2.88 0.95 2.36 1.10 DIMENSION INCH (MM) CONNECTION COMPRESSION LCD VERSION MOUNTING HOLE MODEL FITTING (Except Model GFM 1145) ³/₈" Tube O 6.73 2.00 1.75 6.69 8.81 0.88 5.62 4.69 1.39 1.00 0.18 10-24 Diameter 1143 (170.8) (80.8)

  • Page 35: Parts Of The Flow Meter

    PARTS OF THE FLOW METER LEFT AND RIGHT VIEWS FRONT VIEW...

  • Page 36: Appendix 4 Warranty

    APPENDIX 4 WARRANTY Dwyer Mass Flow Systems are warranted against parts and workmanship for a period of one year from the date of purchase. Calibrations are warranted for up to six months after date of purchase, provided calibration seals have not been tampered with. It is assumed that equipment selected by the customer is constructed of materials compatible with gases used.
  • Page 37 TRADEMARKS Buna ® -is a registered trademark of DuPont Dow Elastometers. Dwyer ® -is a registered trademark of Dwyer Instruments.
  • Page 38 P.O. Box 373 Michigan City, IN 46361 USA e-mail: info@dwyer.com Phone: (219) 879-8000 Internet: http://www.dwyer-inst.com FAX: (219) 879-9057...

This manual is also suitable for:

Gfm--2101Gfm-1102Gfm-2102Gfm-1103Gfm-2103Gfm-1104 ... Show all

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