Rechner Sensors KAS-70 Notice D'utilisation page 10

Electrical connection
Series 20 (NPN)
Series 10 (PNP)
Adjustment of sensitivity
Sealing screw (A)
Information for sensors of the series IAS-10(20)...and KAS-70(80)... of the
certification DMT 01 ATEX E157 for hazardous areas
Description
The capacitive or inductive sensor is for use in areas where is a danger of explosion, caused by combus-
tible dusts. The capacitive sensor (KAS-...2G-1/2D) for instance is used for level control of bulk materials
in silos and containers, appliance group II category 1/2D.
The inductive sensor (IAS-...2G-1/2D) for instance is used as a limit switch, appliance group II category
1/2D.
Futhermore it is designed for use in areas where there is a danger of explosion due to the presence of
inflammable gases, appliance group II category 2G.
The sensor (IAS-...2G-1/2D of KAS-...2G-1/2D) should be installed into the container in such a way, that
only the front part of the casing (active surface) projects into the container and is thus in zone 20. The
other part of the sensor (cable exit, LED's, potentiometer), is outside of the container in zone 21, 22 or
completely outside the hazardous endangered area.
10
Series 70 (NPN)
Series 80 (PNP)
For adjustable sensors the potentiometer is placed under
a sealing screw (A). For some plug-in sensors (B) the
potentiometer is placed on the side without a cover.
Potentiometer (B)
Adjustment:
• Turn clockwise to increase sensitivity
• Turn anti-clockwise to decrease sensitivity
KAS non-flush mountable for level control:
• Immerse the active area (= thread-free zone or 25 mm)
into the medium.
• Turn the potentiometer clockwise until the sensor
switches.
• Then turn the potentiometer a further 90° to the right
(= reliable switching).
• If the sensor switches immediately when immersing
the sensor then turn the potentiometer to the left to the
switching point and then to the right again as described
above.
• Protective earth-terminal for sensors
with metal version and EST version
and/or with Ex protection
• WH/2 only with antivalent output
• For inductive loads, a corresponding
protective circuit (e.g. freewheeling
diode) must be provided.