Detcon FP-424C User Manual

Page 7

4.0 S

PECIFICATIONS

Method of Detection

Catalytic detector diffusion/adsorption

Measurement Range

0-100% LEL (lower explosive limit)

Accuracy/Repeatability

± 3% LEL in 0-50% LEL Range
± 5% LEL in 51-100% LEL Range

Response/Clearing Time

T50 <10 seconds; T90 <30 seconds

Zero Drift

< 5% per year

Operating Temperature Range

-40° to +167° F; -40° to +75°C

Operating Humidity Range

0-100% RH (non-condensing)

Output

Linear 4-20 mA DC

Input Voltage

11.5-28 VDC

Power Consumption (maximum)

< 2.1 watts @ 24 VDC

Electrical Classification

Explosion Proof; Class I, Div. 1; Groups B, C, D

Safety Approvals

CSA/NRTL (US OSHA Certified)

Warranty

Sensor: 2 year conditional
Transmitter: 2 year

Field Wiring

3 conductor; max 10 ohms single conductor resistance

Max Ohms Between Sensor and Transmitter (in applications where sensor head is remotely mounted)

1/2 ohm

5.0 I

NSTALLATION

Optimum performance of ambient air/gas sensor devices is directly relative to proper application and
installation practice.

5.1 Field Wiring Table
Detcon Model FP-424C wiring consists of three conductors: + (+24VDC power), – (DC common), and MA
(4-20 mA DC signal output referenced to DC common). Maximum single conductor resistance between
sensor and controller is 10 ohms. Maximum wire size for termination in the sensor assembly terminal con-
nector board is 14 gauge. Note the wiring table below.

AWG

Meters

Feet

240

800

360

1200

600

2000

900

3000

Note 1: This wiring table is based on stranded tinned copper wire and is designed to serve as a reference only.

Note 2:

Shielded cable may be required in installations where cable trays or conduit runs include high volt-

age lines or other sources of induced interference.

Note 3:

The supply of power must be from an isolating source with over-current protection as follows:

AWG

Over-current Protection

AWG

Over-current Protection

10A

20A

25A

Detcon Model FP-424C Combustible Gas Sensor PG.7