Section 2
ZGARD CX II Controller
Installation Guidelines
The performance of ZGARD CX II Controller is also 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 CX II 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
CX II controller Installation Outline drawing 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.
NOTE
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 CX II
Controller may not be able to communicate appropriately.
6. When connecting the remote sensors, make sure that all wiring is correct and the two leads of the
RS485 bus are not interchanged, or permanent damage to the sensor may result.
7. Perform all wiring and conduit installation in accordance to the National Electrical Code.
Failure to follow the above cautions can result in injury or property damage
.
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