Detcon PI-500 - Manual (Page 16)

3.4.4 Installation Procedure
a) Securely mount the sensor junction box in accordance with recommended practice. See dimensional drawing (Fig. 2).
b) Remove the junction box cover and un-plug the control circuit by grasping the two thumb screws and pulling out-
ward. Observing correct polarity, connect the DC power f ield wiring to the terminals labeled “+” and “–”. Then
connect the 4-20 mA return wire (reference f igure 3). Reinstall cover.
3.4.5 Remote Mounting Applications
Some sensor mounting applications require that the gas sensor head be remotely mounted away from the sensor trans-
mitter. This is usually true in instances where the gas sensor head must be mounted in a location that is diff icult to
access. Such a location creates problems for maintenance and calibration activities. Detcon provides the PI-500 sensor
in a remote-mount conf iguration in which the sensor (Model PI-500-RS) and the transmitter (Model PI-500-RT) are pro-
vided in their own condulet housing and are interfaced together with a four conductor cable. Reference f igure 4 for
wiring diagram.
PI-500 Toxic Gas Sensors PG.16
WHT
BLK
YEL
BLU
mA
VDC Power In
4-20 mA Output
Sensor
Base Connector Board
Figure 3
4 3/4"
3/4" NPT
1/4" Dia.
Mounting Holes
7 1/4"
6 1/8"
5 1/2"
3/4" NPT
Rain
Shield
2"
2 1/8"