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AIR PURGE COLLAR
The air purge collar below is used to keep dust, fumes, moisture, and other contaminants
away from the lens. It must be screwed in fully. Air flows into the 1/8" BSP fitting and out of
the front aperture. Air flow should be 5 to 15 litres/min.
Clean or 'instrument' air is recommended.
ELECTRICAL INSTALLATION
The 4-20 mA output cable is 1 m long as standard. The outer jacket is PVC. One end is
attached, at the factory, to the sensor head. The other end has a pair of wires for the loop-
powered 4-20 mA output and a shield (ground) wire.
WIRING
The sensor can be used in 3 different ways as shown below. To use the 4-20 mA output,
connect the sensor to the controller/indicator with the 24 V DC power supply in the loop
using the following table and connection diagram as a guide. The maximum loop impedance
is 900 ohms.
Note: The sensor must be grounded at only one point, either the cable shield or the
sensor housing.
Output
4 to 20 mA
–
Alternatively, to use the USB output, connect the sensor to a PC using the cable provided.
No external power supply is required when using the USB output. The sensor can also be
used with both the 4-20 mA loop and USB connected, provided that the negative terminal
of the 24 V DC power supply being used is not grounded.
Note: The software must be installed before connecting the sensor to a PC.
Wire No.
1
2
3
Wire Colour
Red
Black
Bare
Function
Power supply + / signal +
Power supply - / signal -
Shield ground
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