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Miniature Size Combustible Gas Pellistor - CH-D3

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• 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:

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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