Miniature Size Combustible Gas Pellistor - CH-D3

• Sensitivity: 10 to 17 mV/% methane
• Response time t90: < 12s from air to 50% LEL methane
• Range: 0 to 100% LEL methane
• Linearity: 6% methane when 5% non-linear
• Temperature Range: -40 to 50°C Certification to T4
• Voltage: 3.0V (±0.2 V)
• Power consumption: 190mW
• Weight​: < 10g​

  • Model Number: CH-D3
  • Data Sheet: Date Sheet File
Quantity:
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  • Miniature Size Combustible Gas Pellistor
  • Miniature Size Combustible Gas Pellistor
  • Miniature Size Combustible Gas Pellistor
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Product Specification

CH-D3 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-D3, with the same good stability and high poison resistance of the CH-A3, is a unique miniature size, only 11.5mm height and 15mm diameter, complementing the existing Alphasense D sensor family.

The CH-D3 has full ATEX, IECEx, UL and CSA certification from -40°C to +50°C at 1.25W, optimising portable gas detector battery life with a shock-proof design.


CH-D3 Combustible Gas Pellistor PERFORMANCE
Sensitivity
mV / % methane
10 to 17
Response time
t90 from air to 50% LEL methane (s)
< 12
Zero
mV in zero air
±25
Range
% LEL methane
0 to 100
Linearity
% methane when 5% non-linear
6



CH-D3 Combustible Gas Pellistor ENVIRONMENTAL
Sensitivity @ -20℃
% sensitivity change, referenced to 20°C
101.5 to 104.5
Sensitivity @ 50℃
% sensitivity change, referenced to 20°C
101.5 to 103
Zero @ -20℃
% LEL change, referenced to 20°C
< ±2
Zero @ 50℃
% LEL change, referenced to 20°C
< +0.5 to -1.5
Temperature Range
Certification to T4    
-40° to 50°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-D3 Combustible Gas Pellistor INHIBITION/POISONING
Chlorine
12hrs 20ppm Cl 2 , 50% sensitivity loss, 2 day recovery
< 10% loss
Hydrogen Sulfide
12hrs 40ppm H 2 S, 50% sensitivity loss, 2 day recovery
< 50% loss
HMDS
hrs until 50% activity loss @ 10ppm HMDS
< 10
Optional H2S disposable filter can be ordered. Part no. ASF-2



CH-D3 Combustible Gas Pellistor ELECTRICAL
Voltage
V (±0.2 V)
3.0
Power consumption
mW
190
Voltage sensitivity
% sensitivity change / 0.1V change
< 3



CH-D3 Combustible Gas Pellistor KEY SPECIFICATIONS
Weight
g
< 10
Operating life
months until 75% original sensitivity (24 month warranted)
> 24


Sensitivity
Hydrocarbon/Gas
% Sensitivity relative to Methane
% LEL Sensitivity to Methane
Hydrogen
120 to 140
150 to 175
Ethane
120 to 140
200 to 230
Propane
140 to 170
330 to 400
Butane
150 to 180
470 to 570
n-Pentane
170 to 200
570 to 670
Hexane
190 to 220
860 to 900
Heptane
190 to 220
900 to 1050
Octane
200 to 230
1000 to 1150
Nonane
190 to 220
830 to 950
Acetylene
140 to 160
280 to 320
Ethylene
150 to 170
275 to 320
Isobutylene
170 to 190
425 to 475

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