Aalborg GFC - Manual (Page 6)

2. INSTALLATION
2.1 Primary Gas Connections
Please note that the GFC Mass Flow Controller will not operate with liquids. Only
clean gases are allowed to be introduced into the instrument. Contaminated
gases 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. Aalborg
7 is not liable for any damage or
personal injury, whatsoever, resulting from the use of this instrument
for oxygen gas.
Attitude sensitivity of the Mass Flow Controller is ±15 F . This means that the gas
flow path of the flow meter must be horizontal within those stated limits. Should
there be need for a different orientation of the meter, re-calibration may be nec-
essary. It is also preferable to install the GFC transducer in a stable environment,
free of frequent and sudden temperature changes, high moisture, and drafts.
Prior to connecting gas lines inspect all parts of the piping system including fer-
rules and fittings for dust or other contaminants. Be sure to observe the direction
of gas flow as indicated by the arrow on the front of the meter when connecting
the gas system to be monitored.
Insert tubing into the compression fittings until the ends of the properly sized tub-
ings home flush against the shoulders of the fittings. Compression fittings are to
be tightened according to the manufacturer's instructions to one and one quarter
turns. Avoid over tightening which will seriously damage the Restrictor Flow
Elements (RFE's)!
Compression fittings should not be removed unless the meter is being cleaned or
calibrated for a new flow range.
Using a Helium Leak Detector or other equivalent method perform a thorough leak
test of the entire system. (All GFC's are checked prior to shipment for leakage
within stated limits. See specifications in this manual.)
2.2 Electrical Connection
GFC transducers require a +12VDC (+24VDC optional) power supply with a min-
imum current rating of 800 mA to operate. The operating power input is supplied
via the 15-pin “D” connector located at the side of the flow transducer enclosure.
On GFC's purchased without an LCD readout, a readout panel meter, digital mul-
timeter, or other equivalent device is required to facilitate visual flow readings.
A built in SETPOINT potentiometer is used for local control of the flow. Variable
analog 0 to 5 VDC (or 4 to 20 mA) reference input is required for remote control.
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