MSA ZGARD S - Page 6

Section 2
ZGARD S & DS Sensors
Installation Guidelines
Mounting:
• Do not mount the sensor to structures subject to vibration and shock, such as piping and piping
supports.
• Do not locate the sensor 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 sensor so it can be easily accessed for service and routine testing.
• The sensor has four mounting lugs; securely mount the instrument to a wall or support using
appropriate hardware.
Wiring Connections:
Before putting a ZGARD S & DS Sensor into operation, determine the elevation and the number of gas sensors
according to the required application. Also refer to the ZGARD S & DS sensor(s) Installation Outline drawings
located in the back of this manual, which provides important information regarding;
• Operating power.
• Required conductors and wire size.
• 4-20mA and RS485 Network wiring connection.
U
C
C
A
A
U
U
T
T
I
I
O
O
N
N
1. When wiring the sensor, disconnect the main power to prevent bodily harm.
2. Do not use the sensor power when connecting any external devices.
3. Use shielded cable for wiring installation. Do not install low voltage signal cable in the same conduit as
the other devices such as sensors operating power and or relay wiring.
4. Make sure that each sensor is given a unique address (Jumper selected), or the associated MSA
ZGARD C series controller may not be able to communicate appropriately.
5. 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.
6. 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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