Section 2, Installation and Setup
Chemgard Infrared Gas Monitor
Wiring Connections
Opening the Unit
All wiring to the Chemgard unit is made via the
side entries. Open the unit to provide complete
access to all wiring connections.
Ensure that all wiring codes are followed. These
codes include, but are not limited to, the National
Electrical Code.
CAUTION
Do not open the Chemgard door unless
equipment is protected from splashing,
spraying, or dripping water; otherwise,
damage to internal components may result.
Unit Power Wiring
A separate, dedicated power source is
recommended for the Infrared Gas Monitor to
ensure that the unit remains powered when other
circuits are shut down for servicing, routine
maintenance or shift changes.
The monitor uses a wide range power supply
which can accept AC power from 100 to 240
volts, 50 or 60 Hz. The power wiring should en
ter
the unit through one of the openings on the right
side of the enclosure. Connections are made to
the screw terminals labeled L1, L2, ACN and
GND, located in the upper right side of the unit
(FIGURE 2-5). The maximum wire size that these
connectors can accept is #12 AWG.
The incoming power provided to the monitor
determines the configuration of the fuse(s) and
wiring to the main power terminal block. FIGURE
2-5 shows the fuse and wire connections for
various voltages.
Power Supply Wiring
1. Using a screwdriver, loosen the two
latches on the enclosure door
(FIGURE 2-1).
2. Open the front door.
3. Determine the power requirements for your
Chemgard unit, ensuring the power is clean
and reliable. (Refer to TABLE 1-1 for
current capacity specifications.)
Figure 2-5. Primary Power Wiring
Wiring the Chemgard Unit
4. Route power wiring through one of the entries in
the side of the unit.
NOTE: Power wiring should be separated
from relay wiring.
5. For single fuse 100/120 Volts AC power
connection, connect the:
•
power wire to L1
•
neutral wire to ACN
•
ground wire to terminal
6. For double fuse 220/240 Volts AC power
connection, connect power wires to L1 and
L2 and ground wire to terminal.
Analog Signal Output Wiring (FIGURE 2-6)
The Chemgard unit has two available analog
outputs. Each analog output is software-selectable
between 10or 100% of full scale:
CAUTION
If unsure of your power available, contact your
facility engineer or safety officer. If incorrect
power is applied, damage may occur to the
instrument.
Figure 2-6. Wiring Connections
To Next Page
Loading...
