Photoionization Gas Sensor (PID Sensor) - PID-A1

• Target gases: < 10.6 eV VOCs with ionisation potentials
• Minimum resolution: < 50 ppb isobutylene
• Linear range: 300 ppm isobutylene 5% deviation
• Overrange: 6000 ppm isobutylene
• Sensitivity: > 0.3 linear range mV/ppm Isobutylene
• Full stabilisation time: 20 minutes to 100 ppb
• Warm up time: 5 seconds time to full operation
• Offset voltage: 50 to 59 mV
• Response time (t90): < 3 seconds diffusion mode

  • Model Number: PID-A1
  • Data Sheet: Date Sheet File
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  • Photoionization Gas Sensor (PID Sensor)
  • Photoionization Gas Sensor (PID Sensor)
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Product Specification

PID-A1 Photoionization Gas Sensor (PID 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-A1 Photoionization Gas Sensor (PID Sensor) Schematic Diagram

 


PID-A1 Photoionization Gas Sensor (PID Sensor) PERFORMANCE
Target gases   VOCs with ionisation potentials   < 10.6 eV
Minimum resolution   ppb isobutylene   < 50
Linear range   ppm isobutylene       5% deviation   300
Overrange   ppm isobutylene   6000
Sensitivity   linear range               mV/ppm Isobutylene, see Table 1 for options  > 0.3
Full stabilisation time   minutes to 100 ppb   20
Warm up time   seconds                     time to full operation   5
Offset voltage   mV   50 to 59
Response time (t90)  seconds                    diffusion mode   < 3



PID-A1 Photoionization Gas Sensor (PID Sensor) ELECTRICAL
Power consumption   85 mW (max) at 3.2 V, 350 mW transient for 200 msec on switch-on

 90 mW at 3.3 V, 460 mW transient for 200 msec on switch-on
Supply voltage   3.2 to 3.6 VDC Ideally regulated ±0.01V (onboard regulator disabled)

 3.6 to 10 VDC (onboard regulator enabled)

 (maximum 10V for IS approval, maximum 18 V for non-IS)

Output signal 

 Offset voltage (minimum 50 mV) to Vmax

 (Vmax = Vsupply -0.1 V when regulator is enabled)




PID-A1 Photoionization Gas Sensor (PID 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-A1 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
Lamp   User replaceable
Electrode stack   User replaceable
Error state signal   Lamp out: 32 ±4 mV
 Electronic error: 22 ±6 mV
Weight   < 8g
Position sensitivity   None
Warranty period   Electronics and housing: 24 months
   Lamp and electrode stack are user replaceable. 10.6eV lamp: 5000 lit hours

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