RKI Instruments Digester Gas Monitor - Manual (Page 48)

42 • Alarm Indications Digester Gas Monitor Operator’s Manual
Responding to an Alarm 1 Condition
This section suggests the following responses to an alarm 1 condition:
1. Follow your established procedure for a low-level combustible or toxic gas condition or
an increasing oxygen condition.
2. An alarm condition can be acknowledged at any point during the detection cycle or
during Standby Mode. To acknowledge the alarm condition and silence the buzzer
while in an alarm 1 condition, press and release the reset switch. The alarm 1 LED will
begin to flash indicating the alarm condition has been acknowledged. You cannot de-
energize the alarm 1 relays until the gas reading falls below the alarm 1 setpoint
during the sampling period of a detection cycle.
3. Alarms are factory set as latching. After the gas reading falls below the alarm 1
setpoint during the sampling period of a detection cycle, press and release the reset
switch to reset the alarm 1 circuit. Resetting the alarm 1 circuit silences the buzzer (if
the alarm has not been acknowledged), turns off the alarm 1 LED, resets the display
for the channel(s) in alarm, turns off the horn/strobe if it is installed and set to activate
for alarm 1, and de-energizes the channel alarm 1 relays.
NOTE: The Digester Gas Monitor saves the last gas reading taken during the sample
period of a detection cycle. If the gas reading is still above the alarm 1 setpoint at
the end of the sampling period, that gas reading is saved and the alarm 1 circuit
cannot be reset. The reading must fall below the alarm 1 setpoint during the
sampling period of a detection cycle before the alarm 1 circuit can be reset.
Alarm 2 Condition
This section describes the indications for an alarm 2 condition and suggests responses to
an alarm 2 condition.
Alarm 2 Condition Indications
When the gas reading of an active channel reaches the alarm 2 setpoint, the Digester Gas
Monitor senses an alarm 2 condition. The Digester Gas Monitor alerts you to an alarm 2
condition as follows:
• the ALARM 2 LED turns on
• the gas reading during an alarm 2 condition alternates with the ALM 1,2 message
• the buzzer sounds a pulsing tone
• the applicable alarm 2 channel relay energizes
• if installed and set to activate for alarm 1, the horn/strobe continues to flash and sound
a pulsing tone
• if installed and set to activate for alarm 2 only, the horn/strobe begins to flash and
sound a pulsing tone when an alarm 2 condition begins
Responding to an Alarm 2 Condition
This section suggests responses to an alarm 2 condition.
1. Follow your established procedure for a high-level combustible or toxic gas condition,
or an increasing oxygen condition.
2. An alarm condition can be acknowledged at any point during the detection cycle or
during Standby Mode. To acknowledge the alarm condition and silence the buzzer
while in an alarm 2 condition, press and release the reset switch. The alarm 2 LED will