A502 Small Angle Rotary Sensor

ANZEx Approved Intrinsically Safe sensors
for Hazardous Gas, Dust and Mining Environments

Available in any travel from 5° to 15°

The A502 RIPS® (Rotary Inductive Position Sensor) is ANZEx approved for use in potentially explosive mining, gas/vapour and dust environmets. It is designed for industrial and scientific feedback applications, like the A500 but with better resolution at smaller angles of deflection, and is ideal for OEMs seeking good sensor performance for arduous applications in hazardous areas.
The A502, like all Positek sensors, provides a linear output proportional with angle of rotation. Each unit is supplied with the output calibrated to the angle required by the customer, between 5 and 15 degrees and with full EMC protection built in. There is a machined registration mark to identify the calibrated mid point. Overall performance, repeatability and stability are outstanding over a wide temperature range. The A502 has long service life and environmental resistance with a rugged stainless steel body, flange and shaft. The flange or servo mounting options make the sensor easy to install, it also offers a range of mechanical options. Environmental sealing is to IP67

Positek intrinsically safe sensors are designed to be used with a galvanically isolated amplifier .  Approved galvanic isolation amplifiers (A005) are available from Positek; there is a choice of 0.5-9.5V or 4-20mA transmission outputs.

The sensor can be installed with a cable length up to 150m between the sensor and the amplifier.


Intrinsic Safety


ANZEx approval

ANZEx approved to Ex ia I/IIC T4 (Ta = -40°C to +80°C) Suitable for all areas (including mining), can be used in areas with continuous, long or frequent periods of exposure to hazardous gas (Zones 2 to 0) and dust (Zone 20), equipment remains energised. Protection class ia, denotes intrinsically safe for all zones Apparatus group IIC: suitable for IIA, IIB and IIC explosive gases. Temperature class T4: maximum surface temperature under fault conditions 135°C. Ambient temperature range extended to -40°C to +80°C. The sensor is certified to be used with up to 150m of cable with parameters not exceeding:- Capacitance = 550 nF total, Inductance = 0.66uH/m Approval only applies to the specified ambient temperature range and atmospheric conditions in the range 0.80 to 1.10 Bar, oxygen <=21%.

Galvanic Isolation Amplifier

It is imperative Positek® intrinsically safe sensors be used in conjunction with a galvanic barrier to meet the requirements of the product certification. The Positek A005 Galvanic Isolation Amplifier is purpose made for Positek IS sensors making it the perfect choice. Refer to the A005 datasheet for product specification and output configuration options.
Sensor input parameters are:-
Ui = 11.4V Ii = 0.2A Pi = 0.51W
Ci = 1.56ìF Li = 0.15mH (cable option/s)
Ci = 1.01ìF Li = 0.05mH (connector option/s)

Sensor Specification




Body Diameter


Body Length (to seal face)



15mm, OD 6mm


For full mechanical details see drawing

Measurement range

Any angle from ±2.5° to ±7.5°

Independant Linearity

<±0.25% up to 15° @ 20°C
<±0.1% available on request

Temperature Coefficient

<±0.01%/°C Gain & <±0.01%FS/°C Offset

Output characteristics





<0.02% FSO

Shaft Torque

<20mNm Static

Frequency Response

>10KHz (-3dB)



Temperature Limits



-40 to + 80°C


-40 to + 125°C

EMC Performance



EN 61000-6-2


EN 61000-6-3




IEC 68-2-6: 10g


IEC 68-2-29: 40 g


350,000 hrs 40°C Gf





Electrical Connections

Screened 3 core cable or integral connector

Detailed Dimensions

Refer to drawings below. Other options available.

Galvanic Isolation Amplifier



Click for pdf
Request AutoCAD Drawing
Datasheet Click for pdf
Installation Sheet Click for pdf


Positek offers a range of options for its standard sensors.
Each sensor is manufactured to suit each customer's preferences.
If your requirement is outside the options given below,
Positek can modify/ redesign a sensor to suit your specific requirement.
Standard options are available as below:


Measurement range:

Factory set to any angle from ±2.5° to ±7.5° in increments of 1°
For example, if your application requires 10° measurement
then Positek will manufacture the sensor specifically for this angular range. The sensor will measure 10° however will still rotate through 360°.

Connector/Cable Options:

Option code
Connector - IP67, M12 - 4 pin
Cable, Gland IP67, M12 - 4 pin
Cable length - The standard length of cable supplied with a Positek position sensor is 50cm although you can specify any length you require, up to a maximum of 15000cm.
Specified in cm after the L
e.g. L200 for 200cm cable from axial cable gland

Mounting Options:
Option code
Flanged housing
Servo mount

Click Here For Approved Galvanic Isolation Amplifier Options



Free Design Service

If you need a position sensor that is outside the scope of the above options to suit your installation requirement or specification, Positek will be happy to modify or create a new design to suit your needs

Contact Positek Technical Department - Click Here


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