Model 5100-28-IT Combustible Gas Sensor Module
2. CAUTIONS & WARNINGS
Although IT Transmitter Modules are designed and constructed for installation and operation in industrial
applications including "hostile" environments, caution should be taken to insure that the installation is made in
compliance with this instruction manual and that certain procedures and conditions are avoided. This chapter
discusses the necessary cautions. Read the entire chapter prior to installation of the equipment.
2.2 IT MODULES - GENERAL
Avoid installing sensor modules where they will be unnecessarily exposed to wind, dust, water (esp. direct
hose down), shock, or vibration. Observe temperature range limitations.
Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity, or
corrosion, may be gradual if such materials are present in low concentrations. These materials include:
Halides (compounds containing chlorine, fluorine, bromine, iodine), acid vapors, caustic liquids or mists.
Care has been taken by the manufacturer to ship your modules in protective packaging to avoid contamination
prior to installation. It is recommended that the modules remain protected during installation and that the
covering be removed immediately prior to system start-up.
During normal use the sensor is protected from dirt and oil contamination by a sintered metal cover. If this
cover becomes clogged, the response of the sensor will be reduced. Protect the sensor from contamination
by careful placement, or by use of rain and dust shields.
Sensor modules must not be painted. Paint may contain compounds which will contaminate the sensor. Paint
will cause clogging of the sintered metal cover and will cause difficulties during attachment of the calibration
head or other maintenance activity. It is recommended that the module be tagged "DO NOT PAINT".
The manufacturer recommends that extra caution be taken where the installation is near any sources of
electromagnetic or radio frequency interference. Precautions include:
• Avoid running sensor module cable close to high power cables, radio transmission lines, or cables
subject to pulses of high current.
• Avoid running cables near large electric motors or generators.
• Unit is shipped with RF filter that is clipped onto the sensor assembly connector.
• User will need to install RFI Noise Suppressor supplied with each sensor module as per Appendix D.
• When the sensor module is to be operated in analog (4-20mA output) mode shielded cable is required.
• When shielding is used, it is recommended that shields be grounded at the controller and nowhere
• All splices must be via either a termination hardware system or soldered. Improperly spliced cable can
result in corrosion, resistance changes and system errors. The use of wire nuts and crimp-on
connectors is unacceptable.
Installation and wiring must be in accordance with the National Electrical Code.
AC Voltage conductors are not to be run in the same conduit as DC voltage