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700 IR Series
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO
GASES
USER MANUAL
5.4
Replacement of IR Plug-in Combustible Gas Sensor
Housing Bottom
Assembly
Splash Guard
a) Remove power to OLCT 700/710 IR detector by lifting the + 24 VDC wire in J-Box.
NOTE: It is necessary to remove power while changing the plug-in sensor in order to maintain
area classification.
b) Use a M1.5 Allen wrench to release the locking setscrew that locks the ITM and bottom
housing together (One turn will suffice – Do not remove setscrew completely).
c) Remove splashguard. Unthread and remove the Bottom Housing from the ITM.
d) Gently pull the plug-in sensor out of the ITM. Orient the new plug in sensor so that it matches
with the female connector pins. It may be necessary to look from below to assure alignment
is correct. When properly aligned, press the sensor in firmly to make the proper connection.
e) Thread the Bottom Housing onto the ITM to a snug fit and tighten the locking setscrew using
the M1.5 Allen wrench. Reinstall the splashguard.
f) With the new IR plug-in sensor physically installed, two functions are required to be
performed:
• Perform the Set Sensor Gain function to match the new sensor with the ITM (Section 3.5.7).
• Perform a successful AutoZero and AutoSpan to match the new sensor with the ITM
(Section 3.4).
36
Plug-in Replacable
Combustible
Hydrocarbon Sensor
Housing Bottom
O-Rings
Locking Set-Screw
Figure 14: OLCT 700 Assembly
2
Lens and LCD
Display
Intelligent Transmitter Module (ITM)
Magnetic
Micro-Processor controlled circuit
Programming
encapsulated in an explosion proof
Switches
housing.
NP700IRIMEN
Revision E.0
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