Combustible Gas Pellistor - CH-A3

• Detection range: 0-100% LEL methane
• Sensitivity: 15~21mV / % methane
• Response time: 15s
• Zero: ± 20mV in zero air​
• Linearity: 6% methane when 5% non-linear
• Voltage: 3.0V (±0.2 V)
• Power consumption: 190mW
• Weight: < 26 g
• Operating life​: > 24​months

  • Model Number: CH-A3
  • Data Sheet: Date Sheet File
Quantity:
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  • Combustible Gas Pellistor
  • Combustible Gas Pellistor
  • Combustible Gas Pellistor
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Product Specification

CH-A3 Combustible Gas Pellistor Description
Alphasense flammable gas pellistors are available in two housing sizes: A for fixed installation applications and A or D for portable applications.

The innovative design of the Alphasense pellistor range provides high quality, low power (only 190mW) and excellent poison resistance. All pellistors are housed in certified flameproof chambers.

CH-A3 is a drop-in (20mm diameter) replacement to existing products with improved stability and poison resistance.

CH-A3 Combustible Gas Pellistor PERFORMANCE
Sensitivity
mV / % methane
15 to 22
Response time
t90 from air to 50% LEL methane (s)
< 15 (typically < 7)
Zero
mV in zero air
±20
Range
% LEL methane
0 to 100
Linearity
% methane when 5% non-linear
6



CH-A3 Combustible Gas Pellistor ENVIRONMENTAL
Sensitivity @ -20°C
% sensitivity change, referenced to 20°C
< 100.5 to 105.5
Sensitivity @ 50°C
% sensitivity change, referenced to 20°C
< 100 to 103
Zero @ -20°C
% LEL change, referenced to 20°C
< +0.5 to -2
Zero @ 50°C
% LEL change, referenced to 20°C
< 0 to -1.5
Temperature Range
Certification to T4
-40 to +55°C
Humidity
12% sensitivity loss from 0% to 80 % rh (22°C)
Typical zero increase % LEL from 0 to 80 %rh (22°C)

1.0
Pressure
Sensitivity change from 0 to 75 kPa (gauge)
< 3%



CH-A3 Combustible Gas Pellistor INHIBITION/POISONING
Chlorine
12hrs 20ppm Cl2, 50 % sensitivity loss, 2 day recovery
< 10% loss
Hydrogen Sulfide
12hrs 40ppm H2S, 50 % sensitivity loss, 2 day recovery
< 50% loss
HMDS
hrs until 50% activity loss @ 10ppm HMDS
9
Optional H2S disposable filter can be ordered. Part no. ASF-1



CH-A3 Combustible Gas Pellistor ELECTRICAL
Voltage
V (±0.2 V)
3.0
Power consumption
mW
190
Voltage sensitivity
% sensitivity change / 0.1V change
3



CH-A3 Combustible Gas Pellistor KEY SPECIFICATIONS
Weight
g
< 26
Operating life
months until 75% original sensitivity (24 month warranted)
> 24

Sensitivity
Hydrocarbon/Gas
% Sensitivity relative to Methane
% LEL Sensitivity to Methane
Hydrogen
130 to 140
160 to 175
Propane
150 to 190
350 to 450
Butane
150 to 180
420 to 500
n-Pentane
180 to 200
 600 to 670
Nonane
150 to 170
800 to 950
Carbon Monoxide
42 to 44
 17 to 18
Acetylene
150 to 170
300 to 340
Ethylene
150 to 170
270 to 320
Isobutylene
 180 to 200
450 to 500

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