Ex sensors
The 46B Ex and 55 Ex series
The sensors of the 46B Ex and 55 Ex series comply with category 3 and have been developed especially for zone 2 ("Gas-Ex") in protection type nA according to EN 60079-15:2005 and for zone 22 ("Dust-Ex") in protection type td according to EN 61241-1:2004. They may be used with conducting and non-conducting dust.
The sensors are accommodated inside a metal casing for protection against mechanical damage. This ensures that even the highest knocking test demands up to 7 joules are safely complied with.
The product spectrum encompasses all known operating principles such as throughbeam photoelectric sensor, retro-reflective photoelectric sensor or scanner with or without background suppression.
Intrinsically safe sensors of the 92 Ex series
The sensors of the 92 Ex series are designed as throughbeam photoelectric sensor, retro-reflective photoelectric sensor and as diffuse reflection light scanner and reliably detect objects at distances from 300 mm to 12 m. In doing so, the intrinsically safe ATEX sensors reliably transmit the switching signals to the VS 403 isolated switching amplifiers with the aid of the NAMUR interface. Sensors of this series may be used in zones 1 and 2 in areas with potentially explosive gases and dusts.
VS 403 isolated switching amplifier with intrinsically safe supply circuit
The VS 403 isolating switching amplifier makes it possible to effect an intrinsically safe circuit for the sensors of the 92 series. The sensors are supplied with power and the switching signals communicated by way of the NAMUR interface. This isolating switching amplifier, which is certified in keeping with the most recent ATEX directives, is available either with a 24 V power supply and relay/transistor output, or with an AC power supply of 110 to 240 V and relay output.
For setting up the intrinsically safe circuit, Leuze electronic also offers blue cables with M12 circular plugs to connect the sensor to the isolating switching amplifier.
96 EX n series in explosion-protected design
The sensors of the 96 series were specially developed for device category 3, Ex zones 2 and 22.
All function principles, such as throughbeam photoelectric sensors, retro-reflective photoelectric sensors and diffuse reflection light scanners, are available in the series. To meet the stricter standards requirements of EN 60079-15:2005 and EN 61241-1:2004 with respect to impact resistance, the devices of the 96 series have also been equipped with an additional protective housing made of metal.
Special accessories for devices with explosion-proof design:
- Interlock guard K-V M12-Ex, 50109217 (prevents unintended disconnection of connectors)
- Cable for the connection of intrinsically safe sensors
RFM 32Ex IDent system - transponder reader for Ex zone 2
Identification is also an issue in Ex applications.
Systems often have a mixed design, i.e. some sections are subject to explosion hazards, others are not. Available especially for surface-treatment applications (immersion baths, varnishing machines, drying etc.) as an extension of our RFID devices for Ex zone 2 (ATEX) is the RFM 32 SL 200 Exn device with long cable (10m).
The function scope corresponds to that of the "standard device" RFM 32 SL 200 (range up to max. 110mm). Depending on the application, several other transponders with ATEX approval (zone 2) are available for selection in addition to our standard selection of transponders.
ODSL 96B Ex d series distance sensors
The ODSL 96B Ex d series distance sensors detect objects located in the light beam or which move through the light beam and measure the distance to these objects without making contact. The sensors have a pressure-resistant, encapsulated housing and can be used in potentially explosive areas with those classification requirements (see table):
| Equipment group | Equipment category | Equipment protection level | Zone | Sub-group |
|---|---|---|---|---|
| II | 2G | Gb | 1 | IIB + H2 |
| II | 2D | Db | 21 |
The devices also meet the special demands on equipment which work with optical radiation in potentially explosive areas (EN 60079-28).
The ex protection marking of the devices is (see right):