M111 Linear Position Sensor

Description

The Positek rugged M111 linear position sensor is ATEX and IECEx approved for use in potentially explosive gas/vapour, dust atmospheres and mining environments. This heavy-duty version of the M101 sensor with a stronger 12.6mm push rod, recommended for applications where vibration is an issue or there is a need for longer travel sensors, mounted horizontally, and supported between rod eyes.

It remains an affordable, durable, high-accuracy position sensor designed for industrial and scientific feedback applications. The unit is highly compact and space-efficient, being responsive along almost its entire length.

Like all Positek® sensors, the M111 rugged sensor provides a linear output proportional to displacement. Each sensor is supplied with the output calibrated to the travel required by the customer, from 0-5mm to 0-800mm and with full EMC protection built in.

The sensor is very robust, the body and push rod being made of stainless steel for long service life and environmental resistance. Overall performance, repeatability and stability are outstanding over a wide temperature range. The sensor is easy to install with mounting options including M8 rod eye bearings and body clamps. The push rod can be supplied free or captive, with female M8 thread, an M8 rod eye, or dome end, Captive push rods can be sprung loaded, in either direction, on sensors up to 300mm of travel. The M111 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 (X005) 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 1km between the sensor and the amplifier.

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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 length from 0-5mm to 0-800mm in increments of 1mm. For example, if your application requires 10" (254mm) measurement, then Positek will manufacture the sensor specifically for this length. The mechanical length and calibration will be set up for 254mm.

Connector/Cable Options

Option	Option Code
Connector Axial IP67 M12 4 pin	J
Connector Radial IP67 M12 4 pin	K
Cable with axial M12 gland, IP67	L (3 core cable) LQ (5 core cable)
Cable with axial short gland, IP67	M (3 core cable) MQ (5 core cable)
Cable with PG9 gland Radial, Gland, IP67	I (3 core cable) IQ (5 core cable)
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 15,000cm	Specified in cm after the L/LQ or I/IQ e.g. L200 for 200cm cable from axial cable gland

Mounting Options

Option	Option Code
M8 rod eye on body (only with option "I" or "K")	N
Body clamps (1 pair)	P
Body clamps (2 pair)	P2
M8 rod eye on push rod	U

Push Rod Options

Option	Option Code
Spring loaded (extended) (up to 300mm stroke - for longer strokes please contact us)	R
Spring loaded (retracted) (up to 300mm stroke - for longer strokes please contact us)	S
Dome end on push rod (only with option "R")	T
Non captive push rod	V

<+/-0.1% FSO Linearity error (≥10mm and ≤400mm stroke length)

Option Code
Z650

Intrinsic Safety

ATEX/IECEx approval

This sensor is ATEX/IECEx approved to:
Ex I/II M1/1GD
Ex ia IIC T4 Ga (Ta = -40°C to + 80°C )
Ex ia 111C 20 T135°C Da (Ta = -40°C to + 80°C )
Ex ia I Ma (Ta = -40°C to + 80°C )
This designates the sensor as belonging to; Groups I and II: suitable for all areas (including mining), Category M1/1 GD: 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.

Gas:
Protection class ia, denotes intrinsically safe for all zones.
Apparatus group IIC: suitable for IIA, IIB and IIC
explosive gases.
Temperature class T4: maximum sensor surface
temperature under fault conditions 135°C .

Dust:
T135°C: maximum sensor surface temperature under fault conditions 135°C.

Ambient temperature range extended to -40°C to +80°C .

Galvanic Isolation Amplifier

Intrinsically safe sensors must be used with a galvanically isolated amplifier with safety parameters not exceeding:- Ui: 11.4V, Ii: 0.2A, Pi: 0.51W. Sensor can be installed with a cable length up to 1000m maximum from the amplifier, cable capacitance and inductance can be up to:- Capacitance: 200 nF max, Inductance: 810 μH max.

Approved amplifiers are available from Positek; there is a choice of 0.5-9.5V or 4-20mA transmission outputs.

Dimensions

Body Diameter	35mm
Body Length (Axial Version)	Measurement length + 163mm
Probe Length (Radial Version)	Measurement length + 186mm
Push Rod Extension	7mm
Push Rod Outside Diameter	12.6mm
Travel	Any stroke from 0-5mm to 0-800mm (e.g. 305mm)
Independent Linearity	<±0.25% up to 450mm <±0.50% over 450mm at 20°C <±0.1% available on request
Temperature Coefficient	<±0.01%/°C Gain & <±0.01%FS/°C Offset
Resolution	Infinite
Noise	<0.02% FSO
Frequency Response	>10KHz (-3dB);

Temperature Limits

Operating	-40 to +80°C
Storage	-40 to +125°C

Other

EMC Susceptibility	EN 61000-6-2
EMC Radiated	EN 61000-6-3
Vibration	IEC 68-2-6: 10g
Shock	IEC 68-2-29: 40g
MTBF	350,000 hrs 40°C Gf
Sealing	IP67
Electrical Connections	Screened cable or integral connector

DATA SHEET

BODY CLAMPS

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M112 Linear Position Sensor