Section 2
ZGARD C Controllers
Installation Guidelines
The performance of ZGARD C Controllers is dependent on the appropriate employment of the
associated remote gas sensors. The remote gas sensors should be strategically placed
closest to the areas where the target gases or vapors might occur in the atmosphere. Follow
the recommended guidelines listed below.
Mounting:
•
Do not mount the controller to structures subject to vibration and shock, such as piping and piping
supports.
•
Do not locate the controller near excessive heat source or in wet and damp locations.
•
For proper cooling, allow at least five inches of clearance around all surfaces except for the mounting
surface. Also consider mounting the controller so it can be easily accessed for service and routine
testing.
•
Make sure the controller is not blocked; otherwise front panel lights and controls will be obscured from
view.
•
The controller has four mounting lugs; securely mount the instrument to a wall or support using
appropriate hardware.
Wiring Connections:
Before putting a ZGARD C controller into operation, determine the capacity, designation and number of remote
gas sensors, and configure the controller according to the required application. Also refer to the ZGARD C
controllers Installation Outline drawings located in the back of this manual, which provides important information
regarding;
•
Operating
power.
•
Number and type of remote sensors.
•
Required conductors and wire size.
•
Relay
wiring
connection.
•
4-20mA Output wiring connection.
CAUTION
1. When wiring the controller, disconnect the main power to prevent bodily harm.
2. Do not use the controller power when connecting any external devices to the relay contacts.
3. Use shielded cable for wiring installation. Do not install low voltage signal cable in the same conduit as
the controller’s operating power and or relay wiring.
4. Do not exceed the contact ratings marked on the relays.
5. Make sure that each sensor is given a unique address (Jumper selected), or the ZGARD C controller
may not be able to communicate appropriately.
6. When connecting the remote sensors, make sure that all wiring is correct for the power and signal
leads. Ensure the RS485 bus wiring is not interchanged, or permanent damage to the sensor may
result.
7. Perform all wiring and conduit installation in accordance to the National Electrical Code.
8. The fuse at the input is a SloBlo type fuse and REPLACE FUSE ONLY WITH A FUSE WITH THE
SAME RATING.
Failure to follow the above cautions can result in injury or property damage
.
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