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4 Environment
4.1 Ambient Temperature
In many cases there is a poor understanding of the actual temperatures at the site where the sensor is mounted.
While process temperatures are typically very well monitored and controlled, there is ambient conditions around
the process have no bearing on product throughput or quality and therefore remain unknown.
In all cases it is recommended to perform considerable testing. The external temperature can be measured at the
surface of the instrument. For automated monitoring, the sensor also provides its internal temperatures via the PC
software or via the digital interface. Alternatively, the sensor-internal alarm relay (if present) can be switched if the
maximum permissible internal temperature is threatened to be exceeded.
Without additional cooling, the maximum permitted internal operating temperature of the sensor of max.
The internal operating temperature can be extended using cooling accessories. For the available extension stages
of the cooling equipment, see section 2.4
4.2 Atmospheric Quality
If the lens gets dirty, infrared energy will be blocked and the sensor will not measure accurately. It is good practice
to always keep the lens clean. The air purge collar accessory helps keep contaminants from building up on the
lens, see section 13.2.9
air at the correct air pressure is installed before proceeding with the sensor installation.
4.3 Electrical Interference
To minimize electrical or electromagnetic interference or noise, please be aware of the following:
•
Mount the instrument as far away as possible from potential sources of electrical interference, such as
motorized equipment, which can produce large step load changes.
•
Use shielded wire for all input and output connections.
•
For additional protection, use conduit for the external connections. Solid conduit is better than flexible
conduit in high-noise environments.
•
Do not run AC power in the same conduit as the sensor signal wiring.
•
To avoid ground loops, make sure that only ONE POINT is earth grounded, either at the instrument or at
the power supply.
Sensor
1.800.561.8187
85°C (185°F) must not be exceeded!
Environmental
Air Purge
, page 100. If you use air purging, make sure a filtered air supply with clean, dry
Figure 4-1: One Earth Ground at the Sensor (left) or at the Power Supply (right)
Cable
Power
Shield
The metal housing of the sensor is electrically connected to the shield of the sensor's cable.
www.
Note
Specifications, page 26.
Sensor
Cable
Shield
Note
information@itm.com
.com
4
Environment
Ambient Temperature
Power
31
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