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P-Type Metal Oxide Hydrogen Sulfide Sensor - H2S-MFF, H2S-PFF, H2S-AFF

? H2S-xFF: equipped with a PTFE-based dust/water filter
? Range: 1 to 100 ppm H2S
? Operating Temperature Range: -20 to 120 °C
? stable baseline
? low humidity sensitivity
? positive response to gases (safer response)

Model Number: H2S-MFF, H2S-PFF, H2S-AFF
Data Sheet:

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Product Specification

P-Type Metal Oxide Hydrogen Sulfide Sensor H2S Sensor Description
This sensor responds well in the temperature and humidity extremes of the oil and gas industry.

Unlike common n-type sensors, this p-type sensor has a large dynamic range, repeatable response, low humidity response and resistance increases in the presence of H2S.

The change in resistance can be converted to an output voltage via a simple electrical circuit. Although the sensor can be used in constant temperature/ voltage mode, best response is achieved when the sensor is cycled between 400°C (sensing temperature) and 525°C (reset temperature).

Developed over many years, our p-type metal oxide gas sensors offer the following benefits:
? stable baseline
? low humidity sensitivity
? positive response to gases (safer response)

H2S detection at high temperatures (up to 120°C) for oil and gas applications

Each sensor type can be supplied in three housings:
? TO-5 metal can, the most common format
? Plastic 6-pin housing - frequently used with other metal oxide gas sensors
? Ex housing - stainless steel 316 housing with UL, CSA, ATEX and IECEx approvals, unique for metal oxides, allowing use in hazardous areas without the need for an IS circuit

P-Type Metal Oxide Hydrogen Sulfide Sensor H2S Sensor Housing options

Housing	H2S
TO-5 metal	H2S-MFF
6-pin Plastic	H2S-PFF
Ex certified metal	H2S-AFF

H2S-xFF: equipped with a PTFE-based dust/water filter

P-Type Metal Oxide Hydrogen Sulfide Sensor H2S Sensor PERFORMANCE
Range	ppm H2S	1 to 100
Sensor resistance (R_o)	k? (50% rh, 23 ±2°C)	280 ±50
Sensor resistance (R_g)	k? H2S @ 24ppm in air	1500 ±500
Sensor resistance ratio (R_g/R_o x 100%)	% H2S @ 24ppm in air	550 ±100

Gas response (R_g/R_o - 1 = k.Concⁿ)	k	0.5 ± 0.1
	n	0.7 ± 0.05

Heater resistance (R_H@ 23 ±2°C)	?	10.5 ±1.5
Heater resistance (R_H@ 400 ±10°C)	?	25 ±3
Heater resistance (R_H@ 525 ±10°C)	?	29 ±3
Heater power consumption (mW)	V_H = 2.7 ±0.2V (400°C)	360 ±30
	V_H = 3.7 ±0.3V (525°C)	550 ±50
Operating Temperature Range	°C	-20 to 120

P-Type Metal Oxide Hydrogen Sulfide Sensor H2S Sensor CROSS SENSITIVITY
H2 sensitivity	% measured gas @ 100 ppm H2	TBA
EtOH sensitivity	% measured gas @ 50 ppm EtOH	TBA
C3H8 sensitivity	% measured gas @ 500 ppm C3H8	TBA
NH3 sensitivity	% measured gas @ 25 ppm NH3	TBA
SO2 sensitivity	% measured gas @ 25 ppm SO2	TBA