Detcon FP-700 User Manual download pdf (Page 13)

Model FP-700

FP-700 Instruction Manual Rev. 3.0 Page 9 of 40

NOTE:

A conduit seal is typically required to be located within 18" of the J-Box and Sensor

Assembly. Crouse Hinds type EYS2, EYD2 or equivalent are suitable for this purpose.

Plug any unused

ports

Explosion Proof

Housing

(J-Box)

Drain

FP-700

Sensor

Assembly

Conduit

"T"

EYS Seal Fitting

MODEL

FP-700

detcon inc.

LEL Sensor

(+)

(-)

A(+)

B(-)

Wiring to

Sensor Assembly

Wht

Blu

Red

Grn

Blk

Explosion

Proof

Junction Box

(+)

(-)

N/U

A(+)

B(-)

Customer

Supplied Wiring

Transient Protection Module

(TPM) P/N 500-003087-100

Mount TPM in Explosion

Proof Enclosure to ground

unit properly. Mount to

bottom of enclosure using

6-32 screws.

6-Pin Pheonix Plug

P/N 306-175705-100

Figure 10 Typical Installation

NOTE:

Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon

supplies one ¾” NPT male plug with their accessory J-box enclosures. If connections are other

than ¾” NPT, use an appropriate male plug of like construction material.

2.6 Field Wiring

Detcon Model FP-700 sensor assemblies require three conductor connections between power supplies and host

electronic controller’s 4-20mA output, and two conductor connections for the Modbus™ RS-485 serial

interface. Wiring designations are + (DC), – (DC), mA (sensor signal), and Modbus™ RS-485 A (+), and B (-

). Maximum wire ohmic resistance between sensor and 24VDC source is defined below. Maximum wire size

for termination in the Detcon J-Box accessory is 14 gauge.

Max Resistance drop on red and black wire is 10 ohms. This considers wire diameter, wire length and

maximum operation temperature.

Max loop load resistance between green and black wire is 500 ohms. Minimum loop load resistance between

green and black wire is 100 ohms. This is considers wire diameter, wire length, max operating temperature

and selected termination resistor.

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Detcon FP-700 User Manual Page 13

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