14
4.5 Use in Ex hazardous areas
The electronics of the sensor are designed to be intrinsically safe with respect to the rod probe. The sepa-
ration between the intrinsically safe circuit at the rod probe and other parts of the electronics, protected by
flameproof enclosure for explosive gas atmospheres and by enclosure for explosive dust atmospheres, takes
place within the housing.
With this setup, cabling with intrinsically safe circuits, blue sheathed cables, and blue fittings are
not
required.
Marking DustEx:
II 1/2D Ex ia/tb IIIC Tx* Da/Db
Zone 20: -20 °C _
< T
process
_
< 240 °C
Zone 21: -15 °C _
< T
amb
_
< 60 °C
The electronic enclosure of PicoFlow Ex 62-0004 may not be installed in dust Ex-areas where intensive
charging processes are to be expected.
- Equipment group: 2
- Equipment category: 1/2 Electrode zone 20 / enclosure zone 21
- For explosive mixtures of air and combustible dusts
- IP-code 68
- Permitted process temperature -20 to 240 °C
-
*
Up to process temperatures of 120 °C, the maximum surface temperature of the electronic
enclosure is 120 °C. In case of higher process temperatures. At higher process temperatures the
allowable surface temperature is determined by the process temperature.
- The intrinsical electrode circuit is operated grounded. Lightning protection measures
(acc. to IEC/EN 60019-14) for Zone 1 / Zone 20 must be followed by the operator.
Marking GasEx:
II 2G Ex db ia IIC T4* Gb
Zone 1: -20 °C _
< T
process
_
< 240 °C
Zone 1: -15 °C _
< T
amb
_
< 60 °C
The sensor is not allowed to be used in areas of class IIC, in case of expected, intense charging
processes.
- Equipment group: 2
- Equipment category: 2 Electrode and enclosure zone 1
- For explosive mixtures of air and combustible dusts
- IP-code 68
- Permitted process temperature -20 to 240 °C
-
*
Up to process temperatures of 130 °C, the sensor corresponds to temperature class T4.
At process temperatures up to 195 °C, the sensor corresponds to temperature class T3 and at
process temperatures up to 240 °C, the sensor corresponds to temperature class T2.
- The intrinsical electrode circuit is operated grounded. Lightning protection measures
(acc. to IEC/EN 60019-14) for Zone 1/Zone 20 must be followed by the operator.
