Detcon FP-424C - Manual (Page 9)

5.4 Local Electrical Codes
Sensor and transmitter assemblies should be installed in accordance with all local electrical codes. Use
appropriate conduit seals.
Drains are required at the bottom of vertical conduit runs. The sensor assemblies
are designed to meet NEC and CSA requirements for Class I; Groups B, C, D; Div. 1 environments.
Note: An appropriate conduit seal must be located within 18" of the sensor assembly. Crouse Hinds type
EYS2, EYD2 or equivalent are suitable for this purpose.
5.5 Installation Procedure
Note: See section 5.6 for special information on remote mounting applications in which the sensor (Model
FP-424C-RS) is remotely mounted away from the transmitter (Model FP-424C-RT).
a) Remove the junction box cover and un-plug the control transmitter by pulling it out via the pull ring.
b) Securely mount the sensor junction box in accordance with recommended practice. See dimensional
drawing (Fig. 2).
c) Terminate 3 conductor field wiring to the sensor terminal connector board observing correct polarity in
accordance with the detail shown in figure 3.
Detcon Model FP-424C Combustible Gas Sensor PG.9
4 3/4"
3/4" NPT
1/4" Dia.
Mounting Holes
7 1/4"
6 1/8"
5 1/2"
3/4" NPT
Rainshield/
Splashguard
2"
2 1/8"
BLUE
YELLOW MA
24VDC
To Controller
Terminals
BLACK
WHITE
Sensor
–
+
4-20MA
Figure #3
Figure #2