Related Manuals for Aalborg GFM 17
Summary of Contents for Aalborg GFM 17
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Page 1: Operating Manual
Technical Data Sheet No. TD9411M Rev. L Date of Issue: January 2010 OPERATING MANUAL GFM MASS FLOW METERS Quality System Registered... -
Page 2: Table Of Contents
Flow Signal Output Readings............Swamping Condition............... 6. MAINTENANCE..................Introduction..................Flow Path Cleaning................6.2.1 Restrictor Flow Element (RFE)............6.2.2 GFM 17 models................6.2.3 GFM 37/47 models................6.2.4 GFM 57/67/77 models..............7. CALIBRATION PROCEDURES..............Flow Calibration................Calibration of GFM Mass Flow Meters.......... - Page 3 7.3.6 100% 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............APPENDIX 2 GAS FACTOR TABLE ("K" FACTORS)........APPENDIX 3 DIMENSIONAL DRAWINGS............
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Page 4: 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 5: Electrical Connections
CAUTION: GFM TRANSDUCERS SHOULD NOT BE USED FOR MONITORING OXYGEN GAS UNLESS SPECIFICALLY CLEANED AND PREPARED FOR SUCH APPLICATION. For more information, contact your distributor or Aalborg 7 . Attitude limit of the Mass Flow Meter is ±15 from calibration position (standard cal- ibration is in horizontal position). - Page 6 FIGURE 2.a - 9-PIN “D” CONNECTOR PINOUTS FOR GFM TRANSDUCER. FUNCTION Remote LCD display signal 0 to 5 VDC output indication 0 to 5 VDC common Power supply, positive Power supply, common Remote LCD display reference (unassigned) 4 to 20 mA output indication 4 to 20 mA common IMPORTANT NOTES: In general, “D”...
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Page 7: Remote Lcd Readouts
2.3.1 Remote LCD Readouts GFM Mass Flow Meters are available with optional remote reading LCD displays supplied with a three foot long wire to accommodate most applications. This con- figuration includes the upper block element which serves as the LCD readout mounting. -
Page 8: Specifications
ATTITUDE SENSITIVITY: Incremental deviation of up to 1% full scale from stated accura- cy, after re-zeroing. OUTPUT SIGNALS: Linear 0-5 VDC (1000 Ω minimum load impedance) and 4-20 mA (0-500 loop Ω resistance); 20 mV peak to peak max noise. Contact your distributor or Aalborg 7 for optional RS232 or IEEE488 interfaces. -
Page 9: Ce Compliance
GFM17S/37S/47S/57S/67S/77S: 316 stainless steel with VITON7 O-rings seals; BUNA7, NEOPRENE7 or KALREZ7 O-rings are optional. Aalborg 7 makes no expressed or implied guarantees of corrosion resistance of mass flow meters as pertains to different flow media reacting with components of meters. It is the customers' sole responsibility to select the model suitable for a particular gas based on the fluid contacting (wetted) materials offered in the different models. - Page 10 FLOW RANGES TABLE I GFM 17 TABLE II GFM 37 LOW FLOW MEDIUM FLOW MASS FLOW METER* MASS FLOW METER* scc/min [N CODE CODE std liters/min [N 0 to 10 0 to 15 0 to 20 0 to 50 0 to 100...
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Page 11: Operating Instructions
The full scale range and gas for which your meter has been calibrated are shown on the flow transducers front label. For optional RS232 or IEEE488 interfaces please contact your distributor or Aalborg 7 . -
Page 12: 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 13: Gfm 17 Models
6.2.2 GFM 17 models Unscrew the inlet compression fitting of meter. Note that the Restrictor Flow Element (RFE) is connected to the inlet fitting. Carefully disassemble the RFE from the inlet connection. The 50 micron filter screen will now become visible. Push the screen out through the inlet fitting. Clean or replace each of the removed parts as necessary. -
Page 14: Calibration Procedures
Remove the block and connected screens. Clean each of the removed parts as necessary. If alcohol is used for cleaning, allow time for drying. Inspect the flow path inside the transducer for any visible signs of contaminants. If necessary, flush the flow path through with alcohol. Thoroughly dry the flow paths by flowing clean dry gas through. -
Page 15: Calibration Of Gfm Mass Flow Meters
FIGURE 7.a - CALIBRATION POTENTIOMETER AND JUMPER LOCATIONS 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 16: Span Adjustment
7.2.3 SPAN Adjustment Reconnect the gas source. Using the flow regulator, adjust the flow rate to 100% of full scale flow. Check the flow rate indicated against the flow calibrator. If the devia- tion is less than ±10% of full scale reading, correct the SPAN potentiometer [R33] setting by using the insulated screwdriver through the access window, to eliminate any deviation. -
Page 17: 25% Flow Adjustment
7.3.3 25% Flow Adjustment Reconnect the gas source. Using the flow regulator, adjust the flow rate to 25% of full scale flow. Check the flow rate indicated against the flow calibrator. Adjust the set- ting for potentiometer [R33] by using the insulated screwdriver through the access window, until the output of the flow meter reads 1.25VDC ±63mV (or 8mA ±0.25mA). -
Page 18: Adjust Scaling
7.4.2 Adjust Scaling Using 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 rate on the GFM to full scale flow (5 VDC or 20mA). Maintain full scale flow, and adjust the potentiometer [R3] on the LCD printed circuit board to desired full scale flow reading. -
Page 19: 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 obstructed at inlet to remove impediments or replace... - Page 20 INDICATION LIKELY REASON REMEDY No zero reading after 15 Embedded temperature has Readjust ZERO minute warm up time and no been changed. potentiometer R34 through flow condition. the access hole (see page 12 for details). No zero reading after 15 Power supply voltage is Measure voltage on pins 4 minute warm up time and no...
- Page 21 INDICATION LIKELY REASON REMEDY LCD Display reading does LCD Display is adjusted for Readjust LCD Display 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 14). output 0-5 Vdc signal.
- Page 22 LIKELY REASON INDICATION REMEDY LCD Display reading is Sensor under swamping Lower the flow through GFM conditions (flow is more above maximum flow range within calibrated range or than 10% above maximum and output voltage 0-5 Vdc shut down the flow com- flow rate for particular signal is more than 5.5 Vdc pletely.
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Page 23: Technical Assistance
INDICATION LIKELY REASON REMEDY GFM is disconnected from Sensor or PC board is Return GFM to factory for defective. the source of the gas (no repair. flow conditions) but LCD Display reading is fluctuating in wide range. Output voltage 0-5 Vdc signal also fluctuating. -
Page 24: 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 con- ditions (standard, normal or other). -
Page 25: Appendix 1 Component Diagram
APPENDIX 1 COMPONENTS DIAGRAM PHONE JACK 9-PIN “D” CONNECTOR DC POWER JACK GFM METERING PC BOARD... -
Page 26: 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 27 K FACTOR Density ACTUAL GAS Relative to N [Cal/g] [g/I] Deuterium D 1.00 1.722 1.799 .4357 .508 1.235 Diborane B .1947 9.362 Dibromodifluoromethane CBr Dichlorodifluoromethane (Freon-12) CCl .3538 .1432 5.395 .4252 .140 4.592 Dichlofluoromethane (Freon-21) CHCl Dichloromethylsilane (CH SiCl .2522 .1882 5.758 .4044...
- Page 28 K FACTOR Density ACTUAL GAS Relative to N [Cal/g] [g/I] 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 Hydrogen Selenide H .7893 .1025...
- Page 29 K FACTOR Density ACTUAL GAS Relative to N [Cal/g] [g/I] Phosphorous Oxychloride POCl .1324 6.843 Phosphorous Pentafluoride PH .3021 .1610 5.620 Phosphorous Trichloride PCl .1250 6.127 Propane C .399 1.967 Propylene C .366 1.877 Silane SiH .5982 .3189 1.433 Silicon Tetrachloride SiCl .284 .1270 7.580...
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Page 30: Appendix 3 Dimensional Drawings
DASHED LINE FOR 6-32 HIGH FLOW UNITS DIMENSION (INCH) CONNECTION Compression Fitting LCD VERSION MODEL (except model GFM 77) C/*C D/*D E/*E GFM 17 1/4" Tube O Diameter 5.60 1.00 1.00 3.00 5.02 0.69 2.69 4.50 GFM 37 5.98 1.37 1.25... -
Page 31: Parts Of The Flow Meter
PARTS OF THE FLOW METER LEFT AND RIGHT VIEWS FRONT VIEW... -
Page 32: Appendix 4 Warranty
This product is not intended to be used in life support applications! TRADEMARKS Aalborg Neoprene ® ® -is a registered trademark of Aalborg Instruments & Controls. -is a registered trademark of DuPont. Buna Viton ® ® -is a registered trademark of DuPont Dow Elastometers.