Specifications

5
I. INTRODUCTION
1. General Information
300 Series gas detectors are designed to measure combustible toxic gases or vapors and oxygen.
With robust materials, a specifically-adapted design, appropriate accessories, INOX bolts, and a
polyamide case (IP66) (IP55 for the CO
2
version), 300 series detectors are designed to withstand the
roughest conditions.
.
2. Composition
CTX 300
Sensor type CEX 300
Toxic Oxygen Semiconductor CO
2
Gases detected Combustible gas Common toxic
gases detected
Oxygen - Combustible gas
- Solvents
- Some Freons
CO
2
Detection method Catalytic oxidation Electrochemical
sensors
1
Electrochemical
sensor
Semiconductor sensor Infrared
absorption
Type of sensor
pack
Explosion-proof
sensor
Pre-calibrated
removable
sensor pack
2
Pre-calibrated
removable sensor
pack: 0-30% scale
or 0-100%
volume.
Removable sensor pack,
not pre-calibrated
Removable
sensor pack
Infrared
column, not
pre-calibrated
Options Cable gland for
flexible cable or
armored cable
3
With display With display
Certification
ATEX II 2GD
4
None None None None
II. INSTALLATION AND CONNECTIONS
For use in explosive atmospheres: in accordance with the European directive ATEX 94/9/EC, you
must read the “Particular Specifications” paragraph.
1. INSTALLING THE DETECTORS
1.1 Layout
While the measuring sensor is always located on the underside of the detector, several factors
determine where the detector should be located:
• If the gas being measured is lighter than the air, place the detector near the ceiling.
• If the gas is heavier than the air (CO
2
and Freons, for example) place the detector close to the
floor.
• Near offtake points.
• Generally, in locations where gas may accumulate, taking into consideration both
- the effects of temperature, and
- the direction of winds.
1
Specific to each gas
2
Choice between several scales
3
Requires grounding
4
EEx ed IIC T6 (-20 to 60°C)