Detcon FP-100 Manuel d'utilisateur télécharger pdf (Page 5)

Model FP-100

FP-100 Instruction Manual Rev. 0.0 Page 1 of 30

1. Introduction

1.1 Description

Detcon Model FP-100 combustible gas sensors are non-intrusive 4-20mA output sensors designed to detect

and monitor combustible gases in air. Range of detection is 0-100% LEL. The basic sensor assembly consists

of a set of catalytic beads mounted in a stainless steel housing and includes a stainless steel Splash Guard

Adapter. Optionally, the sensor may be installed on an explosion proof junction box and may include a Model

100 Series Display. Other options are available, contact Detcon for more information.

DETCON, INC.

LEL

100 %

FP-100

Model 100

Figure 1 Sensor Assembly with Optional J-Box and LED Display

Catalytic Bead (Pellistor) Sensor Technology

The sensor technology is a poison-resistant catalytic bead type. Catalytic bead sensors show a strong response

to a long list of combustible gases. The sensor is supplied as a matched-pair of detector elements mounted in a

plug-in replaceable module. One bead is a catalytically active detector and the other is a non-active reference

detector. Each detector consists of a fine platinum wire coil embedded in aluminum oxide. A catalytic

mixture is applied to the active detector while the reference detector is treated so that oxidation of the gas does

not occur. The technique is referred to as non-selective and may be used to monitor most any combustible gas.

Detcon catalytic bead sensors are specifically designed to be resistant to poisons such as sulfides, chlorides,

and silicones. The sensors are characteristically stable and capable of providing reliable performance for

periods exceeding 5 years in most industrial environments.

Main Housing Insert

Printed Circuit Board

Gold Plated Pins

Platinum Wire

Construction

of Detector

Bead

Catalyst

Alumina Bead

Catalytic Beads

Figure 2 Sensor Cell Construction

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Detcon FP-100 Manuel d'utilisateur Page 5