Teledyne 7320 Operating Instructions Manual page 84

Appendix
Quote "Exceptions" and "GAS PHASE Conditions" for this
application:
1 Response Time is proportional to sample system design for take-off
distance, process pressure, line size, by-pass flow design, dead-
volumes/tee's, sample cell volume and instrument electronics.
2 We assume no particulates that could plug the lines or contaminate the
optical components.
3 Control the pressure in the measuring sample cell to within 0.5 % of the
nominal operating cell pressure (for example: 760 mm ± 4 mm Hg
absolute) is required, return pressure assume to be stable at 1 ATM A.
Maximum cell operation pressure to be 5 psig based upon stan-
dard metal/sapphire cell design.
4 The sample flow through the analyzer should be regulated to within ±
5% of its recommended absolute nominal set point flow value. This will
avoid any pressure drops across any orifices.
5 The temperature of the sample from the take-off thorough the sample
cell must be maintained above its dew point to prevent any moisture or
(vapor pressure) for other possible condensables/mists from occurring
and affecting instrument performance. (Loss of CO2 or other soluble
gases)
6 The sample temperature should not vary at the inlet more than ± 15
of the calibration temperature, nor exceed the design operating specifi-
cations typically 1-40
7 Any background components later found to be present and not speci-
fied in the original application feasibility may void the instrument perfor-
mance should they interfere.
For CO2 the impurity of N2O will interfere. Assume no others at mea-
suring wavelength.
8 We recommend when ambient temperatures exceed outside a 5-45
range that the instrument and sample system be conditioned appropri-
ately for heating/ cooling without condensation.
9 Should the general purpose or explosion proof instrument be supplied
on a back-panel or as a bulk-mount housing, the customer must install
to protect the instrument to meet harsh ambient conditions for dust,
water, snow, wind, corrosion, etc.
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ATTACHMENT 7320
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Teledyne Analytical Instruments
Model 7320
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