CWT GFM A0A0161, Руководство по эксплуатации и установке

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3
2.0 INSTALLATION
2.1 Options
The GFM

can be used as a portable or in-line gas flow monitor. If the unit was
purchased as a portable monitor, it will be equipped with a rubber gas cone. When
installing the rubber hose and gas cone on the GFM

make sure the hose is
installed on the side of the GFM

marked gas inlet. The cone is designed to fit
standard torch gas cups and allows the GFM

to measure the actual gas flow at the
torch. To install, simply press the GFM

gas cone onto the welding torch gas cup.
Make sure that the cone is fitted snugly to the gas cup. The GFM

uses a custom
MEM sensor that is calibrated to measure Air . The GFM

has 6 selectable gas
settings, ARGON, Argon/ CO
2
(90/10), Argon/ CO
2
(80/20), Argon/ CO
2
(75/25),
Helium, and CO
2
. The GFM

can be custom ordered and configured for
additional gas mixtures. By default the Argon gas type is enabled. To change the
gas type, refer to the Section 3: Operations .
2.2 Gas Line Hookup
The GFM may also be installed into the gas line and used to permanently monitor the
gas-flow rate. This model is supplied with barbed 3/8 ID hose fittings. The sensor will
accept any 3/8” NPT pipefitting. The user may hard plumb the sensor if desired.
DO
NOT USE PIPE DOPE OR TEFLON TAPE ON THE PIPE FITTINGS . The sensor
should be located between the welding-gas solenoid and the torch. DO NOT
INSTALL THE SENSOR ON THE INLET SIDE OF THE GAS SOLENOID . If the
sensor is installed on the inlet pressure side of the gas solenoid, the maximum
operating pressure (50 psi) of the transducer may be exceeded.
WARNING : Do not over tighten fittings as it may damage the sensor . The maximum
recommended torque for fittings is 15 in. lbs or 1.7 newton meters
2.3 Cable Hookup
The GFM provides an analog voltage, which will represent gas flow. This analog
voltage can be monitored by using the Auxiliary cable and connecting the plug to the
"AUX" connector on the bottom panel. The output voltage will have the following
relationship:
2.55 volts = 255 scfh
or
0.01 volt/scfh