RKI Instruments Digester Gas Monitor - Manual (Page 42)

36 • Normal Operation Digester Gas Monitor Operator’s Manual
NOTE: If a forced detection cycle overlaps the start time of a scheduled detection cycle,
that scheduled detection cycle will begin immediately after the forced detection
cycle is complete. The next scheduled detection cycle will occur on schedule.
The time between the first scheduled detection cycle that occurred immediately
following the forced detection cycle and the next scheduled detection cycle will
be shorter than if the manual detection cycle had not been initiated and the first
scheduled detection cycle had been allowed to occur.
Each cycle uses a maximum of 63 liters of compressed air. This section describes the
sequence of a detection cycle.
1. A 60 second pre-sample fresh air purge is performed.
2. A fresh air adjustment is performed on all installed sensors.
3. The fresh air readings will be displayed followed by the result of the fresh air
adjustment.
4. A 105 second sampling period is performed.
NOTE: If adjusting the flow rates as described in “Adjusting the Flow Rates” on page 33,
it must be done during the first 90 seconds of this 105 second sampling period
while sample is flowing to the sensors.
Pre-Sample Purge
0 Min 59 Seconds
Zero Adjustment
In Process. . .
1: METHANE 0 %LEL
2: OXYGEN 20.9 %VOL
3: CO2 0.0 %VOL
4: H2S 0 ppm
1: PASSED
2: PASSED
3: PASSED
4: PASSED
Sampling
1 Min 45 Seconds