Target gases

VOCs with ionisation potentials < 10.6 eV

Minimum detection level

ppb isobutylene

1

Linear range

ppm isobutylene

3% deviation

50

Overrange

ppm isobutylene

50

Sensitivity

linear range

mV / ppm Isobutylene

> 20

Full stabilisation time

minutes to 20 ppb

20

Warm up time

seconds

time to full operation

5

Offset voltage

mV variable between detectors

46 to 60

Response time (t90)

seconds

diffusion mode

< 3

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)

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: 35 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