Teledyne 7120 - NDIR analyzer - Manual (Page 24)

Photometric Analyzer Start-up and Operation
3-1 Teledyne Analytical Instruments
3.0 Start-up and Operation
3.1 Preliminary
Before applying power to the system, TAI suggests that the electrical
wiring installation be checked against the system input-output diagram.
Proper attention to this preliminary check will prevent severe damage caused
by wiring errors.
Also, verify that all connections to the system have been made
correctly. Refer to the system outline diagram for proper connections.
3.2 NDIR Analyzer Startup
Power up the unit by depressing the rear panel switch. From a first
time power-on cold start attempt, allow (1) one hour warm-up to proceed.
Observe that the Digital display will go through a diagnostic routine before
the readings revert to a continuous concentration readout.
3.2.1 Initial Set-up and Zeroing
Assure the sample will enter from the zero inlet gas position. Open the
zero gas tank and set the pressure regulator to 20 psig. Set the zero gas flow
to 2 SCFH (1 lpm). Set the sample flow to 2 SCFH (1 lpm). When
applicable, assume the flowing reference cell gas is flowing between 20-50
ccm.
Initialize a zero operation through the system menu. Refer to Section 4
for Electronics /Control Unit Modes and Functioning to navigate the zero
menu.
After the zero cycle is over, the instrument is automatically brought in
the sampling cycle. An inaccurate reading of the concentration of the gas of
interest will be obtained. The instrument is not yet calibrated. Permit the
instrument to operate in this mode for at least one hour to stabilize if not
already done so upon initial power up.
NOTE: The following options could be included in your system:
In case the instrument is part of a multi instrument system, where all
instruments are connected to the same sample system and under control of a
single timer, all instruments of the system will go through the zero and
sample cycle simultaneously. The Control Unit of the instrument which