Teledyne IR-7000 - Non-dispersive infrared series - Manual (Page 27)

NDIR Gas Analyzer Installation 3
Teledyne Analytical Instruments., - Rev. 3 19
• Shock and vibration
• Temperatures below -10° C (14°F) or above 50°C (122°F)
For maximum response, locate the instrument as close to the sample
line as possible.
The ir7000 is designed for mounting into a standard 19” instrument
rack. When mounting, make sure that there are no fans which exhaust
directly at the instrument. The IR7000B is a wall mountable unit housed in
a NEMA-4 enclosure. Both this instrument and the explosion proof model
should be anchored to a wall or special panel.
3.4 Gas Connections
The instrument requires:
• N
2
for zero gas
• A suitable span gas
• Sample gas
Gas connections for sample in and sample return are made on the
rear panel. Barbed connectors are installed on the rear panel for
connection to the customer’s sample system. The IR7000P portable model
has a connector on the front panel for accepting a probe for sampling. It
has a barbed connector on the rear panel for the sample return.
In some installations where the sample take off is located some
distance from the analyzer, it may be useful to install a bypass loop with a
needle valve and flow meter just before the inlet to the analyzer. This loop
can be used to shunt a portion of the sample back to the source to decrease
the lag time of the system by increasing the total flow through the sample
system. Whatever sample system is employed, use a regulator to limit the
pressure to below 5 psig before entering the analyzer.
Once the gas connections are made, run zero gas through the analyzer
to set the flow and check for leaks. Use a flow rate commensurate with
your application. A higher flow will increase the instrument response but
care must be taken to avoid pressurization over 5 psig. For leak testing, a
commercially available soap solution is adequate for gross leak checking.
NOTE: To run gas through the sample cell on instruments using the
autocalibration feature, you must apply power to the instrument and
to energize the solenoid valves.
WARNING: If your application uses a toxic, flammable or explosive gas, use
additional leak checking methods such as a hand held gas sniffer.
Periodically, use a portable combustible gas analyzer or sniffer
around all joints and fittings.