50 ppb до 6000 ppm летучие органические соединения (VOCs) фотоионизирующий датчик газа (ПИД датчик) PID A1

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50 ppb to 6,000 ppm Volatile Organic Compounds (VOCs) Photoionization Gas Sensor (PID Sensor) PID-A1

 

Photoionization Gas Sensor (PID Sensor) PID-A1 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.

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

 

 Photoionization Gas Sensor (PID Sensor) PID-A1 Specification

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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