TX6351 • TX6352 User Manual
12 P5536.1600 rev B
P5536.1600 rev B 13
Flammable gases • Poison resistant catalytic sensor
The sensor can be confi gured to respond to many fl ammable
gases and vapours. It is usual to calibrate to methane in
terms of %LEL or %volume.
TX6350
.240
.246
.244
Methane CH
4
Methane CH
4
Methane CH
4
Sensing element
Poison resistant pellistor with active temperature compensation
Sensing range
0 to 100% LEL
based on 4.4%v/v
0 to 4% v/v
0 to 5% v/v
Linearity
Linear up to 3% v/v
3% to 5% ±0.25%
Max. Drift @ 25°C
±0.25% CH4 v/v per month
*Response time t(63)
<15 secs
*Response time t(90)
<20 secs
Sensing element life
>5 years in clean atmosphere
Warm up time
<5 mins in air or 1% v/v CH4
Stabilisation time
≥15 mins
GENERAL alarm
10% LEL (.240)
0.40% (.246)
0.50% (.244)
HIGH alarm
25% LEL (.240)
1.00% (.246)
1.25% (.244)
* Response times are tested by fl owing test gas using the calibration kit referred to in section 5.2
Maintenance.
Checkpoint
Not suitable for use with the TX6352 4 to 20 mA two wire, line powered version of
Sentro.
Checkpoint
The pellistor is automatically protected against exposure to excessively high
concentrations of gas.
Section 4.4.5
Toxic gases • Electrochemical cells
Selected toxic gas modules are equipped with automatic
STEL/TWA calculation in accordance with EH40.
TX6350
.250.50
.250.250
.250.300
.250.500
.251
.252
Carbon
Monoxide
CO
Carbon
Monoxide
CO
Carbon
Monoxide
CO
Carbon
Monoxide
CO
Hydrogen
Sulphide
H
2
S
Sulphur
Dioxide
SO
2
Sensing
element
Electrochemical cell
Sensing range
0 to
50 ppm
0 to
250 ppm
0 to
300 ppm
0 to
500 ppm
0 to
50 ppm
0 to
20 ppm
Linearity
±2% FS
Drift
2% per month
Repeatability
±2%
*Response
time t(63)
<20 secs
<30 secs
<20 secs
*Response
time t(90)
<30 secs
<45 secs
<30 secs
Operating life
2 years
Relative
humidity
15 to 90% non-condensing
Operating
temperature
-10 to +40°C
GENERAL
alarm
18 ppm
38 ppm
45 ppm
75 ppm
8 ppm
3 ppm
HIGH alarm
15 ppm
75ppm
90 ppm
150 ppm
15 ppm
6 ppm
STEL & TWA
200 ppm
200 ppm
200 ppm
200 ppm
10 ppm
1 ppm
30 ppm
30 ppm
30 ppm
30 ppm
5 ppm
0.5 ppm
* Response times are tested by fl owing test gas using the calibration kit referred to in section 5.2
Maintenance.
Section 4.4.5
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