Detcon IR-700 - Manual (Page 34)

Model IR-700
IR-700 Instruction Manual Rev. 3.1 Page 30 of 40
d) Gently pull the plug-in IR combustible gas 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:
1) Perform the Set Sensor Gain function to match the new sensor with the ITM (Section 3.5.6).
2) Perform a successful AutoZero and AutoSpan to match the new sensor with the ITM (Section 3.4).
5.5 Replacement of ITM
a) Disconnect all sensor wire connections at the J-Box after removing power source.
NOTE: It is necessary to remove power to the J-Box while changing the ITM in order to
maintain area classification.
b) Use wrench and the wrench flats provided at the top section of the ITM and unthread until it can be
removed.
c) 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).
d) Remove splashguard. Unthread and remove the Bottom Housing from the ITM.
e) Gently pull the plug-in IR combustible gas sensor out of the ITM and set it aside along with the
bottom housing and splashguard. Orient the plug in sensor so that it matches with the female
connector pins on the new ITM and press, the sensor in firmly to make proper connection.
f) Thread the bottom housing onto the ITM until snug, tighten the locking setscrew and reconnect
splashguard.
g) Feed the sensor assembly wires through the ¾” female NPT mounting hole and thread the assembly
into the J-box until tight and the ITM lens faces toward the front access point. Connect the sensor
assembly wires inside J-Box (Refer to Section 2.6, and Figure 11).
h) Two functions are required to be performed on the new ITM:
i) Perform the Set Sensor Gain function to match the new sensor with the ITM (Section 3.5.6).
ii) Perform a successful AutoZero and AutoSpan to match the new sensor with the ITM (Section 3.4).
5.6 Replacement of IR-700 Sensor Assembly
a) Disconnect all sensor wire connections at the J-Box, after removing power source.
NOTE: It is necessary to remove power to the J-Box while changing the IR-700 sensor in
order to maintain area classification.
b) Use wrench and the wrench flats provided at the top section of the sensor and unthread until it can be
removed.