Introduction - Crowcon Xgard IR Instrucciones De Instalación, Funcionamiento Y Mantenimiento

1.1 Flameproof flammable gas detector
Xgard IR is a flameproof gas detector, designed to detect hydrocarbon gases or CO
Xgard IR is powered by 24 V dc (nominally) and provides a 4-20 mA signal (sink or
source) proportional to the gas concentration. The detector is certified
IIC T6 Gb, and is suitable for use in Zone 1, Zone 2, Zone 21 and Zone 22 hazardous
areas.
Electrical connections to the detector are made via the terminal block on the PCB
shown below.
Internal grounding
terminal (earth)
Diagram 4: Xgard IR PCB layout
(Shown with PCB cover removed).
Test
points
TP4
VR3
TP3

1. Introduction

II 2 GD Ex db
TP2
Sink
Supplemental
external
grounding
terminal (earth)
Source
TP1
.
2
9