Chapter 3
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BE6020-14
1316A-1 Multi Gas Monitor
LumaSense Technologies A/S
Instruction Manual
Page 42 of 98
Stop Soft Key
On pressing the Stop Soft Key data transmission is stopped.
Stopping a measurement sequence can also be accomplished by
pulling down the Bench Command menu and select Data/Status.
Using Stop Continuous in the Data Status picture (See figure 3.6)
data transmission is stopped.
Zero Soft Key
On pressing the Zero Soft Key a zero calibration is performed on the
NDIR Module and if an Oxygen sensor is mounted the Oxygen sensor
are span calibrated with room air.
Gas concentration data is only valid after a successful zero
calibration.
Zero request interval timeout (90 seconds after POR (power-on-
reset), followed by a 3 minute then a 6 minute interval and 30
minutes thereafter).
Zero is also done when:
♦
After a ±3°C change in detector temperature.
♦
When an ADC input range error occurs on one or more IR
channel (CO
2
, CO, HC, reference).
Zero calibration compensates for conditions that affect gas
concentration measurement.
Examples of these conditions are as follows:
Changes in ambient temperature.
Short-term sample cell contamination caused by inadequate particle
filtering.
Long-term sample cell contamination caused by deposits on the
sample cell wall or windows.
Zero calibration execution time is typically 30 to 45 seconds,
including a purge time that depends on the pneumatics configuration
and a fixed calibration time of 20 seconds.
