LumaSense Technologies INNOVA 1316A-2 - Manual (Page 15)

Chapter 1
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BE6021-11 1316A-2 Multi Gas Monitor LumaSense Technologies A/S
Instruction Manual Page 15 of 97
Sample Cell Temperature:
The Module sample cell temperature is monitored by a thermistor in
contact with the sample cell. This temperature measurement is used
as follows:
An “out of range” sample cell temperature condition causes Freon
and CO
2
data to be declared “data invalid.”
Sample Cell Temperature Out Of Range is set when the Sample Cell
Temperature is not within its allowed range.
NO Sensor Temperature:
A thermistor located in each NO sensor assembly monitors NO
sensor temperature. It is used as follows:
Sensor response during NO gas concentration measurement.
An “out of range” NO sensor temperature condition causes NO data
to be declared “data invalid”.
1.4.5 The NDIR Pressure Measurements.
The Module includes two pressure transducers for measurement of
the pressures. An absolute pressure transducer measures the
pressure in the sample cell. A differential pressure transducer on the
power section of the Printed Circuit Board (PCB) measures the
difference between ambient pressure and the sample gas pressure
between the inlet port and the pump. These pressure measurements
are used as follows:
Sample Cell Pressure (absolute). Sample cell pressure is used as
follows:
Gas law compensation during Freon and CO
2
gas concentration
measurement.
Zero/O
2
Span and Span calibration (via the use of temperature
compensated Freon and CO
2
data).
During a Zero/O
2
Span calibration, sample delivery pressure is
compared to ambient pressure. If the difference is too great, the Out
Flow Fault status bit is set true and the pump is switched Off.