Photo Ionisation Detector Sensor for VOC Gas with Ionisation Potential

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 6,000
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

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)

ENVIRONMENTAL
Temperature range -40ºC to +55ºC (Intrinsically Safe); -40ºC to +65ºC (non-IS)
Temperature dependence 0°C to 40°C 90% to 100% of signal at 20°C
-20°C 140% of signal at 20°C
Relative humidity range Non-condensing 0 to 95%
Humidity sensitivity During operations: 0% to 75% rh transient near zero

KEY SPECIFICATIONS
Operating life 5 years (excluding replaceable lamp and electrode stack)
IS Approval IECEx Ex ia IIC T4; ATEX Ex ia II 1G -40ºC < Ta < +55ºC (< 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: 5,000 lit hours