Detcon CXT-IR - Manual (Page 14)

Model CXT-IR
The sensor should not be positioned where it may be sprayed or coated with surface contaminating substances.
Painting sensor assemblies is prohibited.
Although the sensor is designed to be RFI resistant, it should not be mounted in close proximity to high-
powered radio transmitters or similar RFI generating equipment.
When possible mount in an area void of high wind, accumulating dust, rain, or splashing from hose spray,
direct steam releases, and continuous vibration. If the sensor cannot be mounted away from these conditions
then make sure the Detcon Harsh Location Dust Guard accessory is used.
Do not mount in locations where temperatures will exceed the operating temperature limits of the sensor.
Where direct sunlight leads to exceeding the high temperature-operating limit, use a sunshade to help reduce
temperature.
2.3 Sensor Contaminants and Interference
Detcon CXT-IR combustible hydrocarbon gas sensors may be adversely affected by exposure to certain
airborne substances. Loss of sensitivity or corrosion may be gradual if such materials are present in sufficient
concentrations.
The performance of the IR sensor may be impaired during operation in the presence of substances that can
cause corrosion on gold plating. Other inhibiting substances are those that can coat the internal walls of the
optical chamber and reduce reflectivity. These include but are not limited to heavy oil deposits, dust/powder,
water condensation, and salt formation. Continuous and high concentrations of corrosive gases (such as Cl
2
,
H
2
S, HCl …etc.) may also have a detrimental long-
term effect on the sensorꞌs service life.
The presence of such substances in an area does not preclude the use of this sensor technology, although it is
likely that the sensor lifetime will be shorter as a result. Use of this sensor in these environments may require
more frequent calibration checks to ensure safe system performance.
For the CXT-IR combustible gas sensors there are no known cross-interference gases that are not combustible
hydrocarbon gases.
2.4 Sensor Mounting
The CXT-IR should be vertically oriented so that the sensor points straight downward (Figure 11). The
explosion-proof enclosure or junction box is typically mounted on a wall or pole. Detcon provides a selection
of standard junction boxes in both Aluminum and Stainless Steel.
NOTE
If wall mounting without a mounting plate, ensure to use at least 0.5"spacers under the
Detcon Aluminum Junction Box’s
1
/
4
" mounting holes to move the sensor assembly away
from the wall and allow access clearance to the sensor assembly.
When mounting on a pole, secure the Junction Box to a suitable mounting plate and attach the mounting plate
to the pole using U-Bolts. (Pole-Mounting brackets for Detcon Junction Boxes are available separately.)
CXT-IR Instruction Manual Rev. 1.6 Page 10 of 44