RKI Instruments Digester Gas Monitor User Manual
Page 33
Digester Gas Monitor Operator’s Manual
Wiring the Digester Gas Monitor • 27
2.
Open the housing door, then place the power switch in the OFF position.
CAUTION: The power switch does not control DC input power.
3.
Locate the applicable alarm terminal strip (see Figure 5 on page 12).
4.
Install an appropriately rated cable bushing or conduit in an unused conduit hub on
the bottom of the Digester Gas Monitor.
5.
Guide the wiring of the external alarm device through the selected conduit hub on the
bottom of the Digester Gas Monitor housing.
6.
Connect the leads from the external alarm device and an external power source to the
selected channel alarm or fail relay contact terminals as shown in Figure 15.
Figure 15: External Alarm Wiring
7.
Repeat step 5 and step 6 for additional external alarm devices.
Connecting Recorders
Perform the following procedure to connect an analog signal recording device to the
Digester Gas Monitor. The output at the recorder output terminals for each channel is a 4 -
20 mA signal that corresponds to the detection range of the detector connected to that
Digester Gas Monitor channel. Be sure to read the recording device’s operator’s manual
before installation and follow all wiring procedures and recommendations made by the
recording device’s manufacturer.
1.
Turn off or unplug incoming power to the Digester Gas Monitor.
2.
Open the housing door, then place the power switch in the OFF position.
CAUTION: The power switch does not control DC input power.
3.
Locate the recorder output terminals on the right end of the detector/transmitter
terminal strips. See Figure 5 on page 12 to assist you in locating the recorder output
terminals. They are labelled 4 - 20 mA OUTPUT + and 4 - 20 mA OUTPUT -.
4.
Install an appropriately rated cable bushing or conduit in an unused conduit hub on
the bottom of the Digester Gas Monitor housing.
5.
Guide the wiring from the recording device through the selected conduit hub on the
bottom of the Digester Gas Monitor housing.
External
Power Source
(+) H
(-) N
Channel 1, Relay 1 Alarm Terminals
From Channel Alarm Terminal Strip
NO NC C
CH 1 RELAY 1
External Alarm Device