Detcon FP-524D Quick Start Guide - Manual

www.detcon.com [email protected] 713.559.9200 FP-524D Quick Start Guide April 23, 2014 • Document #4462 • Revision 1.1
Detcon Quick Start Guide
Model FP-524D
Combustible Gas Sensor (0-100% LEL)
CAUTION
If equipment is used in a manner not specified by Detcon, the protection provided by
the equipment may be impaired. Applying power with devices hooked up incorrectly
may cause damage to the equipment.
General Installation Notes
 Install the sensor only in areas with classifications matching the approval label, and in compliance with local
electrical codes.
 Follow all warnings listed on the label.
 Mount the FP-524D vertically, with sensor facing down. Locate the sensor with due consideration for the
properties of the gas to be detected, likely sources, ventilation, personnel exposure, and maintenance access.
 Ensure that the housing bottom and plug-in sensor are installed during operation. The housing bottom should be
threaded tightly to the sensor housing.
Field Wiring Mounting Installation
After mounting the FP-524D vertically with the sensor pointing straight down, mount the explosion-proof enclosure or
junction box on a wall or pole. When mounting on a pole, secure the junction box to a suitable mounting plate and
attach the mounting plate to the pole using U-bolts.
NOTE Do not use Teflon tape or any other type of pipe thread material on the ¾-in. threads unless the
unit is mounted in a severe or harsh environment. Metal-on-metal contact must be maintained to
provide a solid electrical ground path. If Teflon tape is used, the sensor must be externally
grounded using a ground strap.
Sensor Connector PCB
NOTE Shielded cable is required for installations where cable trays or conduit runs include high
voltage lines or other possible sources of induced interference. Separate conduit runs are highly
recommended in these cases.
NOTE The supply of power should be from an isolated source with over-current protection.
CAUTION
Do not apply System power to the sensor until all wiring is properly terminated.
1. Remove the junction box cover and unplug the Transmitter Module.
2. Observing correct polarity, terminate the three-conductor 4-20mA field wiring (DC+, DC-, and MA) to the sensor
assembly wiring in accordance with the detail shown in Figure 1.
Customer
Wiring
White
Blue
Yellow
Black
Wiring to
LEL Sensor
Power
mA
Ground
Figure 1 FP-524D Sensor Connector PCB
NOTE A 6-32 or 8-32 threaded exterior ground point is provided on most junction boxes for an external
ground. If the Sensor Assembly is not mechanically grounded, an external ground strap must be
used to ensure that the sensor is electrically grounded.
3. Trim and cap all exposed wire leads if they are not permanently landed in the terminal board.
4. Plug the Transmitter Module into the connector PCB and replace the junction box cover.
Remote Mounting Installation
NOTE If using the FP-524D remote-mount configuration (sensor model FP-524D-RS and transmitter
model FP524D-RT), follow the specifications for maximum separation in
Table 1 and refer to the