Environment; Ambient Temperature; Atmospheric Quality; Electrical Interference - Fluke Thermalert 4.0 User Manual

®
Thermalert 4.0 Series
Users Manual, Rev. 1.1, May 2018

4 Environment

4.1 Ambient Temperature

The sensor is suited for a maximal operating temperature, see section 2.4
The operating temperature can be extended by using the air/water-cooled housing accessory, see section
8.2.10 Air/Water-Cooled

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 8.2.9
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:
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1.800.561.8187
Housing, page 71.
Air Purge , page 70. If you use air purging, make sure a filtered air supply with clean, dry
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.

Figure 4-1: One Earth Ground at the Sensor (left) or at the Power Supply (right)

Sensor Cable
Shield
The metal housing of the sensor is electrically connected to the shield of the sensor's cable.
All inputs and outputs are electrically NOT connected to the power supply
(except the alarm output for the 2-wire model).
www.
Power Sensor
Note
Note
.com
Environmental Specifications, page 22.
Cable Power
Shield
information@itm.com