700M HFID
6-2-15
19
Calibration gases can be introduced through either the calibration ports on the back of the
analyzer (if optional solenoid valves have been installed) or through the sample inlet. Gases
introduced through a calibration port should be at 20-25 PSIG. If introduced through the sample
port, pressures should be as follows:
a.
Without sample pump, pressure should be 10-25 PSIG.
b.
With sample pump – no pressure.
Gas Connections
CAUTION:
Be sure tubing and joints are clean. Dust entering the instrument may cause
it to malfunction. Be sure that all tubing, fittings and other gas handling equipment are
completely free of any type of hydrocarbon contamination.
If optional solenoid valves have been installed and the calibration gases are not connected to
calibration inlets on the back of the analyzer, the cal gases will need to be delivered through the
sample port at pressure settings listed above.
The tubing from the sampling system to the gas analyzer should be made from corrosive-
resistant material such as Teflon
®
or stainless steel. Rubber or soft vinyl tubing should not be
used since readings may be inaccurate due to gas absorption into the tubing material. For fast
response, the tubing should be as short as possible. Optimum tube internal diameter is 0.16 inch
(4 mm). Couplings to the instrument use ¼-inch tubing.
A sample gas bypass fitting is located on the rear panel. Keep pressure at this outlet at
atmospheric level. Vent this gas away from the analyzer and ensure a safe atmospheric
discharge.
In general, use heated sample lines for measuring heavy hydrocarbons and for the transportation
of hot, wet gases. This instrument does not control the temperature in the external heated lines.
There are provisions to terminate heated sample lines at the rear of the instrument. However,
adequate precautions should be taken to eliminate the possibility of ‘cold spots’ between the end
of the heated sample line and the inlet of the analyzer.
