Photoionization Gas Sensor (PID Gas Sensor) - PID-AH

• Target gases: < 10.6 eV VOCs with ionisation potentials
• Minimum detection level: 1 ppb isobutylene
• Linear range: 50 ppm isobutylene 3% deviation
• Overrange: 50 ppm isobutylene
• Sensitivity: > 20 linear range mV / ppm Isobutylene
• Full stabilisation time: 20 minutes to 20 ppb
• Warm up time: 5 seconds time to full operation
• Offset voltage: 46 to 60 mV variable between detectors
• Response time (t90): < 3 seconds diffusion mode

  • Model Number: PID-AH
  • Data Sheet: Date Sheet File
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  • Photoionization Gas Sensor (PID Gas Sensor)
  • Photoionization Gas Sensor (PID Gas Sensor)
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Product Specification

PID-AH Photoionization Gas Sensor Description
With a PID, the sample gas is exposed to deep ultraviolet light.

The emitted light ionises targeted gases and they are then detected by the PID electronics and reported as a concentration (ppb or ppm).

PIDs can measure Volatile Organic Compounds (VOCs) to very low concentrations.
Considered the gold standard for VOC measurement,  Alphasense PIDs are compact and low power, with recently improved electronics and longer lamp life. An extended family of lamps now include better BTEX and chlorinated VOC detection.  These sensors are pin-replaceable with the 4P90 pellistor.

The Alphasense PID sensor is offered in two models, A12 and AH2. They are virtually insensitive to humidity changes, providing unparalleled performance in a variety of applications.

PID-A12 has a linear dynamic range of 50 ppb to 6,000 ppm (Isobutylene).
PID-AH2 has a linear dynamic range of 1 ppb to 50 ppm (Isobutylene).

The sensors include a detector with lamp driver, amplifier circuitry, and user replaceable electrode stack, 10.6 eV lamp and particulate filter.

PID-AH Photoionization Gas Sensor Features:
• Measurement range of 0~50ppm
• High resolution of 1ppb
• Linear output
• No need of circuit design and easy to use
• With internal heater, the sensor can work normally under high humidity without being affected.

PID-AH Photoionization Gas Sensor  Schematic Diagram

PID-AH Photoionization Gas Sensor  PERFORMANCE

Target gases

 VOCs with ionisation potentials

 < 10.6 eV

Minimum detection level

 ppb isobutylene


Linear range

 ppm isobutylene                    3% deviation



 ppm isobutylene 



 linear range                            mV / ppm Isobutylene

 > 20

Full stabilisation time

 minutes to 20 ppb


Warm up time

 seconds                                  time to full operation


Offset voltage

 mV variable between detectors

 46 to 60

Response time (t90)

 seconds                                  diffusion mode

 < 3




PID-AH Photoionization Gas Sensor (PID Sensor) ELECTRICAL

Power consumption

 85 mW (max) at 3.2 V, 300 mW transient for 200 msec on switch-on

Supply voltage

 3.2 to 3.6 VDC Ideally regulated ±0.01V (onboard regulator disabled)
 3.2 to 10 VDC (onboard regulator enabled)
 (maximum 10V for IS approval, maximum 18 V for non-IS)

Output signal

 Offset voltage (minimum 46 mV) to Vmax
 (Vmax = Vsupply -0.1 V when regulator is enabled)




PID-AH Photoionization Gas Sensor  ENVIRONMENTAL

Temperature range

-40℃ to +55℃ (Intrinsically Safe); -40℃ to +65℃ (non-IS)

Temperature dependence

 0℃ to 40℃ 90% to 100% of signal at 20℃

 -20℃ 140% of signal at 20℃

Relative humidity range

 Non-condensing 0 to 95%

Humidity sensitivity

 During operations: 0% to 75% rh transient near zero




PID-AH Photoionization Gas Sensor (PID Sensor) KEY SPECIFICATIONS

Operating life 

 5 years (excluding replaceable lamp and electrode stack)

IS Approval 

 IECEx Ex ia IIC T4; ATEX Ex ia II 1G -40℃ < Ta < +55℃ (< 10VDC supply)

Onboard filter 

 To remove liquids and particulates


 User replaceable

Electrode stack 

 User replaceable

Error state signal 

 Lamp out: 35 mV


 < 8g

Position sensitivity


Warranty period

 Electronics and housing: 24 months
 Lamp and electrode stack are user replaceable. 10.6eV lamp: 5,000 lit hours

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