P-type Metal Oxide VOC Sensor - VOC-MFF, VOC-PFF, VOC-AFF

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

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

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Product Specification

P-type Metal Oxide VOC Sensor Description
This sensor is a broadband total VOC detector. When the cost of a PID is not justifiable, this sensor will detect VOCs with 10-50 ppb limit of detection, depending on the VOC.

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

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)

Volatile Organic Compounds (VOCs) detection for low cost IAQ 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 VOC Sensor Housing options

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

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

P-type Metal Oxide VOC Sensor PERFORMANCE
Range	ppm isobutylene limit of performance warranty	1 to 100
Sensor resistance (R_o)	kΩ (50% rh, 23 ± 2°C)	220 ±45
Sensor resistance ratio (R_g /R_o x 100%)	%; Isobutylene @ 10ppm in air	285 ±30

Gas response relationship (R_g /R_o - 1 = Σk_i x Concⁿ )		0.5 +/- 10% (k for isobutylene)
where k_i = constant for gas i, n = 1 or 0.5		0.5 (n for isobutylene)

Heater resistance (R_H@ RT)	Ω(23 +1°C)	10±1.5
Heater resistance (R_H@ sensing temp.)	Ω(400 +10°C)	22±3
Heater resistance (R_H@ reset temp.)	Ω(525 +10°C)	26±3
Heater power consumption (mW) typical for 5:1	V_H= 2.7±0.2V (400°C)	340±30
Heater power consumption (mW) typical for 5:1	3.7±0.3V (525°C)	530±50
Operating Temperature Range	°C	-20 to 120

P-type Metal Oxide VOC Sensor SENSITIVITY TO OTHER GASES
EtOH sensitivity	% measured gas @ 10 ppm EtOH	TBA
C3H8 sensitivity	% measured gas @ 500 ppm C3H8	TBA