Gf40/Gf80 Series Troubleshooting Guide - Brooks Instrument GF40 Serie Manual De Instalación Y Funcionamiento

Section 4 Maintenance & Troubleshooting
Brooks ® GF40/GF80 Series

4-5 GF40/GF80 Series Troubleshooting Guide

Table 4-2 GF40/GF80 Series Troubleshooting Guide
Symptoms & Possible Causes
1. No gas flow.
Is the gas supply turned on?
Is the regulator turned on at the
correct operating pressure?
Are any upstream or downstream
shut-off valves closed, either by
the system or because of failure?
Is the MOD LED light on the
lit solid green?
Is the commanded setpoint from
tool/system at 0.00 Vdc?
Has the valve been commanded
off by an active "valve closed" input?
2. Flow out of range.
Is the gas inlet/outlet pressure differential
either too high or too low?
NOTE: If the differential pressure is too high,
voltage to the valve will be zero, which is
abnormally low for the setpoint. If the
differential is too low, voltage to the valve will
be at its maximum value, which is abnormally
high for the set-point.
Is the MOD LED light on the GF40/GF80 Series
lit solid green?
Is the setpoint correct for the
required gas flow?
Is the device calibrated for the
particular gas?
4-4
Corrective Action
Check shut-off valve and pressure readout. Open
the gas supply.
Turn off the regulator and reset it to the
recommended pressure as described in the
Data Sheet.
Verify that the valves are open and operating
properly.
GF40/GF80 Series Observe the LED display panel on top of the GF40/GF80
device to verify. If the LED light is not lit, cycle power the
to reboot device.
Use the tool software to verify.
Use the tool software to verify.
Confirm that pin 12 is not connected to DC common.
Verify that the pressure is correct for the gas
and range. If required, adjust inlet/outlet pressure
to achieve proper pressure reading.
Observe the LED at the top of the GF40/GF80 device.
If the LED light is not lit, cycle power the device to
reboot.
Use the tool software to verify the analog signal.
Check the device side label. Run a
flow check to verify.
Installation and Operation Manual
X-TMF-GF40-GF80-Series-MFC-eng
Part Number: 541B161AAG
August, 2012