RKI Instruments Digester Gas Monitor - Manual (Page 12)

6 • External Description Digester Gas Monitor Operator’s Manual
• Silences the buzzer during an alarm 1, alarm 2, or alarm 3 condition if the alarm
buzzer silence parameter in the Global Menu is set to CAN SILENCE BUZZER. See
“Viewing and Changing Global Parameters” on page 47 for more information on
setting the silence feature.
• Silences and resets the optional horn/strobe during an alarm 1, alarm 2, or alarm 3
condition if the strobe alarm setting parameters are set to Resettable STROBE in the
Configuration Menu. See “Viewing and Changing Channel Parameters” on page 51
for more information on setting the strobe alarm setting parameters.
• Silences the buzzer and optional horn/strobe if the fail silence parameter in the Global
Menu is set to CAN SILENCE FAIL. See “Chapter 5: Global Menu” on page 47 for
instructions to change this parameter.
• Displays and resets the minimum and maximum gas concentration values detected.
Buzzer
The buzzer is on the bottom right of the housing, behind the reset switch. The buzzer
sounds an audible alarm to warn you of gas alarms and instrument failures.
Inlet and Exhaust Fittings
There are a total of 7 fittings on the bottom of the Digester Gas Monitor housing.
Fresh Air Inlet
The fresh air inlet is a compression fitting and is located just to the left of the reset switch.
It accepts 1/4 inch OD rigid metal or rigid plastic tubing. The tubing connected to this inlet
needs to be routed to a fresh air environment.
Calibration Gas Inlet
The calibration gas inlet is a hose barb fitting and is located just to the left of the fresh air
inlet. It accepts 3/16 inch ID flexible tubing and is used to connect a calibration cylinder to
the Digester Gas Monitor during a calibration.
Blow Back Exhaust
The blow back exhaust fitting is a hose barb fitting and is located near the front left of the
Digester Gas Monitor’s bottom panel. This fitting allows debris removed during the blow
back procedure to be expelled. It accepts 3/16 inch ID flexible tubing.
Dryer Exhaust
The dryer exhaust fitting is a compression fitting and is located along the left side of the
Digester Gas Monitor’s bottom panel. It accepts 1/4 inch OD rigid metal or rigid plastic
tubing.
Digester Sample
The digester sample fitting is a compression fitting and is located below the dryer exhaust
fitting. A 1/4 inch OD tube must be connected to this fitting and routed to the area to be
sampled.
Compressed Air Inlet
The compressed air inlet fitting is a compression fitting and is located below and to the
right of the digester sample fitting and is used to connect an air compressor or a tank of
compressed air. It accepts 1/4 inch OD rigid metal or rigid plastic tubing.