ASM posirot PRAS Series User manual

POSIROT®/ PRAS......
Analog Magnetic
Angle Sensors
Instruction Manual
Explosion-proof Sensors
Please read carefully before installation and operation!
Save these instructions for future reference.

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POSIROT®EX
Contents
Contents Safety instructions 3
Intended use 4
Non intended use 4
Description 5
Marking 5
Mounting 5
Placement and alignment of the position magnet 5
Reference position 6
Electrical connection 7
Potential equalization 8
Connecting the sensor 8
Mechanical information 11
Torque for the mounting screws 11
Removal 11
Maintenance and service 12
Maintenance interval 12
Outline drawings 13
Specification of the outputs 23
Accessories 25
Position magnets 25
Mounting plates 28
Declaration of conformity 30

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POSIROT®EX
Instruction Manual
Do not use POSIROT®position sensors in safety critical applica-
tions where malfunction or total failure of the sensor may cause
danger for man or machine.
For safety related applications additional mechanisms (devices)
are necessary to maintain safety and to avoid damage.
Disregard of this advice releases the manufacturer from pro-
duct liability.
The sensor must be operated only within values specied in the
catalog or datasheet.
Connection to power supply must be performed in accordance
with safety instructions for electrical facilities and performed
only by qualied personnel.
The qualied personnel must have knowledge about the type of
ex-protection, regulation and ordinance of operating equipment
in ex-proof areas.
Check that the protection class of the sensor is suitable for the
operation conditions.
Do not connect or disconnect the sensor under tension!
Disregard of this advice can lead to malfunctions, damage to
property or personal injury and releases the manufacturer from
product liability.
Safety
instructions

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POSIROT®
Instruction Manual
Notes
Intended use The angle sensor was intended for angle position measurement via rotati-
on of the position magnet or rotation of the shaft, when used in the properly
rated ambient explosive atmospheric and technical conditions for which the
sensor is designated.
Unintended use The unintended use is when the application has an explosive gas atmo-
sphere or higher explosive dust atmosphere that requires a higher rated
device.

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Instruction Manual
Description The angle sensors PRAS of the POSIROT®product family perform touch-
less or shaft based angle measurement. A position magnet rotates in front
of the sensing area of the sensor head. The angular position is converted
into a standardized high resolution voltage or current output. Measuring
ranges 15° to 360° having rising or falling characteristic are available.
PRAS2EX-M12A II 3D Ex tc IIIC T80°C Dc X
PRAS2EX-M12R II 3D Ex tc IIIC T80°C Dc X
PRAS3EX-M12A II 3D Ex tc IIIC T80°C Dc X
PRAS3EX-M12R II 3D Ex tc IIIC T80°C Dc X
PRAS5EX-K-M12A II 3D Ex tc IIIC T80°C Dc X
PRAS5EX-K-M12R II 3D Ex tc IIIC T80°C Dc X
PRAS5EX-V-M12A II 3D Ex tc IIIC T80°C Dc X
PRAS5EX-V-M12R II 3D Ex tc IIIC T80°C Dc X
II = Equipment group II
3 = Hazard Category 3
D = applicable in Zone 22; D = dust
tc = Protection by enclosure: dust, zone 22
IIIC = conductive dust
T80°C = The maximum allowed housing temperature is 80 °C
X = Tested with low impact energy 4 J
Ambient temperature: -20 °C to +40 °C
Marking
Sensors

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Mounting
POSIROT®EX
Instruction Manual
Mounting
Measuring error by misalignment of the position magnet
Placement and alignment of the position magnet
For non-contact sensor models air gap and alignment of sensor and position
magnet has to be observed. The linearity will degrade in case of misalign-
ment. Also external magnetic elds and magnetized materials nearby can
effect the measuring result.
Sensor Position
magnet
Air gap
[mm]
Paral-
lelism
[°]
Error by axial misalignment
[°]
0,2
mm
0,5
mm
1 mm 2 mm 3 mm 4 mm
PRMAG2-VA 0 ... 5 5 0.1 0.3 0.8 1.8 6.5 -
PRAS2EX PRMAG2Z-VA 0 ... 9 5 0.1 0.2 0.6 1.5 4.5 8.5
PRMAG5Z-VA 0 ... 8 5 0.1 0.2 0.6 1.5 4.5 8.5
PRMAG2-VA 0 ... 4.5 5 0.1 0.3 0.8 1.8 6.5 -
PRAS5EX PRMAG2Z-VA 0 ... 5.5 5 0.1 0.2 0.6 1.5 4.5 8.5
PRMAG5Z-VA 0 ... 7.5 5 0.1 0.2 0.6 1.5 4.5 8.5

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Mounting Reference position
For ease of mounting there are reference markings at housing, position
magnet and near the shaft. If both markings match output will be on the
50% of full scale.
Clockwise increasing signal (CW), view to measuring area/shaft
Counterclockwise increasing signal (CCW), view to measuring area/shaft
Example for angle range 90°
Example for angle range 360°
POSIROT®EX
Instruction Manual
Range [°]
Marking
Range [°]
Marking
Marking
Marking

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POSIROT®EX
Instruction Manual
Mounting Output Value range 50% value of output signal
U2 0.5 ... 10 V 5.25 V
U6 0.5 ... 4.5 V 2.5 V
I1 4 ... 20 mA 12 mA
Elektrical connection
Mounting / removal of the sensor under non-explosible conditions only.
Excitation voltage, excitation current
Wiring of the connector or the connecting cable, excitation voltage and
excitation current see chapter “Specication of the outputs“ at the end of
this manual.
Connect the cable screen - if present - to the local potential equilizer.
Caution:
• Assembled accessory cables may have different wire colors!
Take notice of the accessory pages of the catalog.
• Sensors with connector output have the given IP protection class
only with the correct plugged mating connector!
• Follow the signal wiring table!

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Instruction Manual
Potential equalization
• The local potential equalization has to be realized with a wire cross
section of 4 mm² minimum.
PRAS2EX PRAS3EX PRAS5EX-K PRAS5EX-V
Connecting the sensor
• Connecting and disconnecting of the M12 connector / socket only if
excitation voltage is OFF.
Mounting

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Torque Mounting method Material Torque
[Nm]
M2,5 screws for mounting brackets (PRAS2,
PRAS3) – 0.8
M3 screws for mounting ange (PRAS3) – 1.2
M8 screws (PRAS5) – <20
POSIROT®EX
Instruction Manual
• Only approved M12 connector / socket can be used, which can
removed only with special tools, e.g. z.B. EVC 04A or EVC 05A of
ifm/Essen
• Cables must be xed rmly and protected against damage.
• Protect cables against UV radiation.
• Do not turn the M12 connector insert.
• A separate cord grip is recommended.
• Installation according to DIN EN 60079-14.
Mechanical information
• Do not mount the sensor in dust condition.
• Avoid dust deposit.
• Do not expose the sensor to shocks, the housings have been
tested with low impact energy (DIN EN 61241-0).
PRAS2EX-M12A Impact energy 4J
PRAS2EX-M12R Impact energy 4J
PRAS3EX-M12A Impact energy 4J
PRAS3EX-M12R Impact energy 4J
PRAS5EX-K-M12A Impact energy 4J
PRAS5EX-K-M12R Impact energy 4J
PRAS5EX-V-M12A Impact energy 4J
PRAS5EX-V-M12R Impact energy 4J
• Do not expose the sensor to shocks or any kind of impacts.
• Tightening torque – see following table.
Torque of the xing screws
Mounting