RKI Instruments Digester Gas Monitor User Manual
Page 31
Digester Gas Monitor Operator’s Manual
Wiring the Digester Gas Monitor • 25
Connecting the AC Power Source
NOTE: If you are using DC power as the primary power source, go to the next section,
“Connecting the DC Power Source”.
The AC in terminal strip will accept 24 - 14 AWG wire. When selecting wire to connect the
AC power source to the Digester Gas Monitor, be sure to meet the local electrical code.
Also be sure to use an appropriate circuit breaker in the AC line close to the Digester Gas
Monitor that meets the local electrical code.
Perform the following procedure to connect the AC power source to the Digester Gas
Monitor.
WARNING:
Verify that the power source is unplugged or turned off before you continue with
this procedure.
1.
Turn off or unplug all 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 AC in terminal strip (see Figure 5 on page 12). The terminals are labelled
L, N, and G for line, neutral, and ground respectively.
4.
Install an appropriately rated cable bushing or conduit in the right-most conduit hub on
the bottom of the Digester Gas Monitor housing.
5.
Guide the AC power cord or wires in conduit through the right-most conduit hub on the
bottom of the Digester Gas Monitor housing.
6.
Connect the AC wires to the AC in terminal strip as shown in Figure 13 below.
Figure 13: AC Power Wiring
Connecting the DC Power Source
WARNING:
Verify that the power source is unplugged or turned off before you continue with
this procedure.
DC power may be used as a primary power source. It may also be used as a backup
power source with a 24 VDC battery if AC power is the primary power source. If your
Digester Gas Monitor does not include the battery charging feature, you may use a self
contained 24 VDC backup that keeps its batteries charged while AC power is on and
recharges the batteries when AC power returns after a power failure. If your Digester Gas
Monitor includes the battery charging feature, see “Battery Charging (Optional)” on
L2
220 VAC Wiring
N
G
AC In Terminal Strip
Earth Ground
AC In Terminal Strip
L
AC Power
220 VAC
50 / 60 Hz
L1
G
N
Line (Hot)
Earth Ground
Neutral
100/115 VAC Wiring
L
AC Power
100/115 VAC
50 / 60 Hz