M112 Linear Position Sensor

Description

The Positek M112 gauge head linear position sensor is ATEX and IECEx approved for use in potentially explosive gas/vapour, dust atmospheres and mining environments.

It is designed for gauge head positioning in industrial and scientific applications and is ideal for OEMs seeking good sensor performance for arduous applications in hazardous areas.

The M112, like all Positek® sensors, 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 0-50mm and with full EMC protection built in. Overall performance, repeatability and stability are outstanding over a wide temperature range.

The sensor is very robust, the body and plunger being made of stainless steel for long service life and environmental resistance. The plunger is spring loaded with a domed end. The M112 is easy to install with a long ½ inch UNF mounting thread and is supplied with two lock nuts for positioning. 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 0-50mm in increments of 1mm. For example, if your application requires 3/4" (19mm) measurement, then Positek will manufacture the sensor specifically for this length. The mechanical length and calibration will be set up for 19mm.

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 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 e.g. L200 for 200cm 3 core cable from axial cable gland

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

Option Code
Z650

Intrinsic Safety

ATEX/IECEx approval

The sensor is ATEX/ IECEx approved to:
Ex II 1GD
Ex ia IIC T4 Ga (Ta = -40°C to + 80°C )
Ex ia 111C 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; Group II: suitable for all areas including mining, Category 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	19mm
Body Length	Axial version: 160.7mm Radial version: 169.5mm
Mounting Thread Length	59mm
Spring Force	1.5 - 4.5N (approximately)
Travel	Any stroke from 0-5mm to 0-50mm (e.g. 19mm)
Independent Linearity	<±0.25% 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

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