Photoionization Gas 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
  • Photoionization Gas Sensor
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Product Specification

PID-A1 Photoionization Gas Sensor Schematic Diagram


PID-A1 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: 0 V 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 - 3.6 V (typically 3.0 V) 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. These sensors will be internally regulated to 3.3V
Normally shipped with regulator disabled.

PID-A1 Photoionization Gas 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 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 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 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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