RKI Instruments Digester Gas Monitor - Manual (Page 41)

Digester Gas Monitor Operator’s Manual Overview • 35
Chapter 4: Operation
Overview
This chapter describes the Digester Gas Monitor in normal operation. This chapter also
describes the Digester Gas Monitor in alarm 1, alarm 2, alarm 3, and fail conditions, and
suggests responses to these conditions.
Normal Operation
Normal operation is defined as follows:
• the start-up procedure is complete.
• the Digester Gas Monitor is not indicating an alarm 1, alarm 2, alarm 3, or fail
condition.
• the Digester Gas Monitor is not running in one of the selection menus or Calibration
Mode.
During normal operation, the Digester Gas Monitor will perform a detection cycle as often
as the sample interval dictates. In between detection cycles, the Digester Gas Monitor is in
Standby Mode and the display will alternate between the last recorded gas reading for all
active channels and the time left until the next detection cycle occurs. The example below
illustrates a typical Digester Gas Monitor channel allocation.
The PILOT LED is on indicating that the Digester Gas Monitor is receiving incoming
power.
Detection Cycle
The Digester Gas Monitor performs a detection cycle as often as the Cycle Interval Time
parameter in the Global Menu dictates. During a detection cycle, the Digester Gas Monitor
locks out the ability to enter other operational modes or menus, such as Calibration Mode.
The Digester Gas Monitor must be in Standby Mode in order to enter other operational
modes or menus.
A detection cycle can be manually started at any time while the Digester Gas Monitor is in
Standby Mode by pressing and holding the ENTER button for 5 seconds. Forcing a
detection cycle does not reset the time left until another scheduled detection cycle begins.
The next scheduled detection cycle happens on schedule.
Standby Mode
# of Samples 0
Next Detection Cycle
in 0D: 0H: 59M: 59S 1: METHANE 0 %VOL
2: OXYGEN 20.9 %VOL
3: CO2 0.0 %VOL
4: H2S 0 ppm