Photoionization 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
  • Photoionization Gas Sensor
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Product Specification

1. PID-AH Photoionization Gas Sensor Schematic Diagram

2. PID-AH Photoionization Gas Sensor notes

1. Do not obstruct Ø3.5 sensing area
2. Seal between Ø6.2 and Ø9.0 (if different to atmosphere)
3. Pin out details:
    Pin 1: + V supply (See note 5)
    Pin 2: Signal output
    Pin 3: 0V supply
4. All dimensions ±0.1mm unless otherwise stated
5. Input voltage selector hole:
    a) When filled with solder the onboard regulator is disabled. A regulated supply of 3.0 - 3.6V (typically 3.3V) is then required.
    b) When not filled with solder the onboard regulator is enabled. A regulated or unregulated supply between 3.6 - 10 V is then required for IS applications, or up to 18 V for non-IS applications.
Nomally shipped with regulator enabled

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 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 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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