Detcon PI-700 - Manual (Page 41)

Model PI-700
PI-700 Instruction Manual Rev. 2.5 Page 37 of 54
Figure 31 Sensor Cell and ITM Mating
d) Thread the Splash Guard Adapter onto the ITM to a snug fit and tighten the locking setscrew using the
1/16” Allen wrench. Reinstall the splashguard.
e) Verify the gas type and range of the new sensor by checking in View Program Status. It is recommended
“AutoZero and AutoSpan functions be performed, as per Section 3.4 Calibration Mode, to match the new
intelligent plug-in sensor with the ITM.
5.3 Replacement of ITM
a) Remove the power source from the sensor assembly. Disconnect all sensor wire connections at the J-Box
taking note of the wire connections.
NOTE: It is necessary to remove power to the J-Box while changing the ITM in order to
maintain area classification.
b) Use a wrench and the wrench flats provided at the top section of the ITM and unthread the ITM until it can
be removed.
c) Use a 1/16” Allen wrench to release the locking setscrew that locks the ITM and Splash Guard Adapter
together (One turn will suffice - Do not remove setscrew completely).
d) Remove splashguard. Unthread and remove the Splash Guard Adapter from the ITM.
e) Gently remove the plug-in gas sensor from the old ITM and install it in the new ITM. Orient the plug-in
sensor pins so that they match with the female connector sockets on the new ITM then press the sensor in
firmly to make proper connection.
f) Thread the Splash Guard Adapter 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 9).
h) Perform Set AutoSpan Level, Set Serial ID, Set Range, and then perform a successful AutoZero and
AutoSpan before placing sensor into service.
Plug-in Sensor
(Bottom View)
ITM
Bottom View
Locking Setscrew
Display Window