Detcon FP-624C Manuel d'utilisateur télécharger pdf (Page 4)

3.0.3 Base Connector Board

The base connector board is mounted in the

explosion proof enclosure and includes: the

mating connector for the control circuit,

reverse input and secondary transient suppres-

sion, input filter, alarm relays, lugless termi-

nals for all field wiring, and a terminal strip

for storing unused programming jumper tabs.

The alarm relays are contact rated 5 amps @

125 VAC, 5 amps @ 30 VDC and coil rated

at 24 VDC. Gold plated program jumpers are

used to select either the normally open or

normally closed relay contacts.

3.0.4 Explosion Proof Enclosure

The sensors are packaged in a cast metal explosion proof enclosure. The enclosure is fitted with a threaded cover

that has a glass lens window. Magnetic program switches located behind the transmitter module face plate are acti-

vated through the lens window via a hand-held magnetic programming tool allowing non-intrusive operator inter-

face with the sensor. All calibration and alarm level adjustments can be accomplished without removing the cover

or declassifying the area. Electrical classification is Class I; Groups B, C, D; Div. 1.

3.1 PRINCIPLE OF OPERATION

Method of detection is by a controlled rate of diffusion/adsorption. Air and gas diffuse through a sintered stainless

steel filter and contact both the active and reference detector beads. The surface of the active detector promotes

oxidation of the combustible gas molecule while the reference detector has been treated not to support this oxida-

tion. The reference detectors serve as a means to maintain zero stability over a wide operating temperature range.

When combustible gas molecules oxidize on the surface of the active detector, heat is generated, effectively chang-

ing the electrical conductance of the active detector. Electronically, the detectors form part of a balanced bridge cir-

cuit. As the active detector changes in electrical conductance, the bridge circuit unbalances. This change in output is

conditioned by amplifier circuits that are an integral part of the assembly. The sensor response and clearing character-

istics are quite rapid resulting in a method of continuous and accurate monitoring of ambient air conditions.

Model FP-624C Combustible Gas Sensor PG.4

ALARM 1

WHT

BLK

YEL

BLU

DC Power In

NO/NC

COM

NO/NC

COM

NO/NC

COM

FAULT ALM-2 ALM-1

Alarm Dry Contacts

ALARM 2

FAULT

-20 mA Output

S-485 In

RS-485 Out

Optional Voltage

Developing Resistor

Use 250 ohm 1/4w

JUMPERS

UN-USED

umper Programmable Alarm Outputs

Normally Open or Normally Closed

Sensor

Place un-used alarm programming

jumper tabs here

etcon inc.

Program Switch #2

FLT

1CAL

icroSafe™ LEL Gas Sensor

HO USTON , TEXA S

GM 2

PGM 1

MODEL FP-624C

ONTRAST

larm & Cal LEDs

rogram Switch #1

Menu Driven Display

Plug-in Microprocessor Control Circuit

Display Contrast Adjust

1 2 3 4 5 6 7 8 9 ... 25 26

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Detcon FP-624C Manuel d'utilisateur Page 4

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