Figure #1, Figure #2 – Detcon TP-624C User Manual
Page 9
3.5.3 Local Electrical Codes
Sensor and transmitter assemblies should be installed in accordance with all local electrical codes. Use appropriate
conduit seals. Drains & breathers are recommended. The sensor assemblies are CSA-NRTL approved for Class I;
Groups B, C, D; Div. 1 environments.
3.5.4 Accessibility
Consideration should be given to easy access by maintenance personnel as well as the consequences of close prox-
imity to contaminants that may foul the sensor prematurely.
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.
3.5.5 Installation Procedure
a)
Remove the junction box cover and un-plug the control circuit by grasping the two thumb screws and pulling outward.
b)
Securely mount the sensor junction box in accordance with recommended practice and proper orientation (see fig. 1 & 2).
c)
Observing correct polarity, terminate 3 conductor field wiring, RS-485 wiring, and applicable alarm wiring to the
sensor base connector board in accordance with the detail shown in Figure 3. Normally open and normally closed
Form C dry contacts (rated 5 amp @ 125VAC; 5 amp @ 30VDC) are provided for Fault, Alarm 1, and Alarm 2.
Note: Per U.L. approval, these relays may only be used in connecting to devices that are powered by the same
voltages.
d)
Position gold plated jumper tabs located on the connector board in accordance with desired Form C dry con-
tact outputs: NO = Normally Open; NC = Normally closed (see f igure 3).
Note: If a voltage signal output is desired in place of the 4-20mA output, a 1/4 watt resistor must be installed
in position R1 of the terminal board. A 250
Ω
resistor will provide a 1-5V output (– to mA). A 100
Ω
resistor will
provide a .4-2V output, etc. This linear signal corresponds to 0-100% of scale (see f igure 3).
Detcon Model TP-624C Hydrogen Sulfide Sensor PG.9
EYS
Seal
Fitting
Drain
“T”
Plug any unused ports.
Figure #1
4 3/4"
3/4" NPT
1/4" Dia.
Mounting Holes
7"
6 1/8"
5 1/2"
3/4" NPT
Rainshield/
Splashguard
2"
2 1/8"
Figure #2