Detcon FP-624C Manuel d'utilisateur télécharger pdf (Page 6)

3.2.2 Response to Different Gases

An attractive feature of the catalytic detector elements is their almost universal response to lower explosive limits of

hydrocarbons. Most detectable gases produce a similar output, however the signal amplitudes differ. The table in

section 3.7 lists theoretical factors (K factors) for different gases which are a measure of their signal amplitude as

compared to methane which has a K factor of 1.00. Since these factors are theoretical, they will only give a guide to

the response expected in other gases. The Model FP-624C sensor can be configured to detect any of the listed gases.

The gas selected for detection is referred to as the target gas. The sensor can also be configured to allow the user to

calibrate with a listed gas other than the target gas. This selection is referred to as the calibration gas. Unless other-

wise specified, Model FP-624C sensors are configured to detect methane and are calibrated with methane to a scale

of 0-100% LEL. Refer to section 3.7 for details.

3.3 SPECIFICATIONS

Method of Detection

Catalytic detector diffusion/adsorption

Measurment Range

0-100% (lower explosive limit) LEL

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 +175° F; -40° to +75°C

Operating Humidity Range

0-99% non-condensing

Output

3 relays (alarm 1, alarm 2, and fault) contact rated 5 amps @ 125 VAC, 5 amps @ 30 VDC;

Linear 4-20 mA DC; RS-485 Modbus™

Input Voltage

22-28 VDC

Power Consumption

Normal operation = 84 mA (2 watts); Full alarm = 128 mA (3.1 watts)

Electrical Classification

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

Safety Approvals

CSA/NRTL (US OSHA Certified)

Sensor Warranty

2 year conditional

3.4 OPERATING SOFTWARE

Operating software is menu listed with operator interface via the two magnetic program switches located under the

face plate. The two switches are referred to as “PGM 1” and “PGM 2”. The menu list consists of 3 items which

include sub-menus as indicated below. (Note: see the last page of this manual for a complete software flow chart.)

01. Normal Operation

a) Current Status

02. Calibration Mode

a) Zero

b) Span

03. Program Menu

a) Program Status

b) Alarm 1 Level

Model FP-624C Combustible Gas Sensor PG.6

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Detcon FP-624C Manuel d'utilisateur Page 6

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