Teledyne 3020M - Explosion proof paramagnetic oxygen analyzer - Manual (Page 35)

Percent Paramagnetic Oxygen Analyzer Installation 3
3-13 Teledyne Analytical Instruments
The gas pressure in should be regulated at about 10 psig. Pressures
between 5 and 20 psig are acceptable as long as the pressure, once estab-
lished, will keep the front panel flowmeter reading in an acceptable range of
700 cc/minute.
If greater flow is required for improved response time, install a bypass
in the sampling system upstream of the analyzer input.
ZERO IN and SPAN IN: These are additional ports, included on
models with the –C option, for inputting span gas and zero gas. There are
electrically operated valves inside for automatic switching between sample
and calibration gases. These valves are completely under control of the
3020M Electronics. They can be externally controlled only indirectly
through the Remote Cal Inputs, described below.
Pressure, flow, and safety considerations are the same as prescribed for
the SAMPLE IN inlet, above.
EXHAUST OUT: Exhaust connections must be consistent with the
hazard level of the constituent gases. Check Local, State, and Federal laws,
and ensure that the exhaust stream vents to an appropriately controlled area if
required.
3.5 Testing the System
Before plugging the instrument into the power source:
• Check the integrity and accuracy of the gas connections. Make
sure there are no leaks.
• Check the integrity and accuracy of the electrical connections.
Make sure there are no exposed conductors
• Check that sample pressure is between 5 and 20 psig, according
to the requirements of your process, and the exhaut line is open to
atmosphere.
Power up the system, and test it by performing the following
operations:
1. Repeat the Self-Diagnostic Test as described in chapter 5, section
5.5.