What to do if gas does not flow through Aalborg GFM 17 Measuring Instruments?
If gas isn't flowing through your Aalborg GFM despite inlet pressure, and the LCD Display and output voltage signal show zero flow, the filter screen might be obstructed at the inlet. Flush it clean, disassemble to remove impediments, or replace the filter screen (see 6.2 on page 9). Note that calibration accuracy can be affected.
What to do if display reading does not respond on zero adjustment of Aalborg GFM 17 Measuring Instruments?
If, after a 15-minute warm-up with no flow, your Aalborg Measuring Instruments display no zero reading and the display reading doesn't respond to zero adjustment, it suggests that the power supply voltage is less than 11.0 Vdc. Measure the voltage on pins 4 and 5 of the 9 pin D-connector. If the voltage is indeed less than 11.0Vdc, replace the power supply with a new one (regulated 12.0 Vdc, 250 mA minimum is recommended).
Why LCD Display reading and analog output fluctuate during flow measurement on Aalborg GFM 17?
If the LCD Display reading and analog output fluctuate widely during flow measurement with your Aalborg Measuring Instruments, it might be because the output signal is shorted on the GND or overloaded. Check external connections to pins 2 and 3 of the D-connector and ensure the load resistance exceeds 1000 Ohm.
Why 0-5 Vdc output signal does not change on Aalborg Measuring Instruments?
If the LCD Display reading corresponds to the correct flow range, but the 0-5 Vdc output signal remains constant (or near zero) on your Aalborg GFM, the output schematic may be burned out or damaged. Return the GFM to the factory for repair.
How to troubleshoot lack of reading or output in Aalborg GFM 17?
If your Aalborg Measuring Instruments show no reading or output, consider these potential causes and solutions: * **Power supply:** Verify the power supply is properly connected. * **Fuse:** If the fuse is blown, disconnect the GFM transducer from the power supply to allow the fuse to reset automatically after you remove the shorting condition or check the polarities. * **Filter screen:** Check for obstructions in the filter screen at the inlet; flush it clean, disassemble to remove impediments, or replace it. * **Sensor tube:** An occluded sensor tube can also cause this issue; flush it clean, or return the unit to the factory for replacement. * **PC board or power supply:** A defect in the PC board or a problem with the power supply itself could be the culprit; in either case,...
Why is the calibration off on my Aalborg Measuring Instruments?
If your Aalborg Measuring Instruments are showing incorrect calibration, here are a few things to check: * **Gas type:** Ensure the gas being metered matches the gas the meter was calibrated for. Use matched calibration. * **Gas composition:** A change in the gas composition can affect calibration. Refer to the K factor tables in APPENDIX 2. * **Gas leak:** Locate and correct any gas leaks. * **RFE dirty:** Flush clean or disassemble the RFE to remove any impediments. * **Sensor tube:** An occluded sensor tube can affect calibration; flush it clean or return it to the factory for replacement. * **Filter screen:** Check for obstructions in the filter screen at the inlet; flush it clean, disassemble to remove impediments, or replace it. * **Transducer mounting:** Ensure the tr...
General| Type | Mass Flow Meter |
|---|---|
| Material | Stainless Steel |
| Process Connection | 1/4" |
| Output Signal | 0-5 VDC or 4-20 mA |
| Power Supply | +15 VDC to +24 VDC |
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