Griekspoor Thermal Coatings bv is an international company specializing in the application and finishing of coatings for the maritime and hydraulic industry (piston rods). All Griekspoor coatings are marketed under the name TOPCOAT.
The Griekspoor Linear Position Measurement system (LPM) is composed of a combination of one special sensor and a rod with a specific profile below the coating surface. There are two magnetic strength transducers in the sensor that “look” through the coating to the underlying rod profile. When the rod moves in either direction the transducer generates an incremental block signal that is processed in a counter.
Two magnetic strength transducers in the sensor that “look” through the coating to the underlying rod profile.
Each transducer in the sensor immediately produces a block signal.The combination of both transducer signals give a 90° shifted block-patterned signal. This signal can be processed by standard available reading units and counters, because the signal is similar to that of an incremental rotary encoder or pulse encoder.
Edge detection causes quadrupling of the signal providing direction recognition. After all, when reversing direction, the sequence of “0” and “1” changes. The level of the signal depends on the supply voltage used for the sensors. The required supply voltage has to be at least 10VDC and at most 30VDC (28VDC maximum with ATEX- version, ATEX certificate: BVS 07 ATEX E 030 II 2 G Ex ib IIB T).
Power supply: +10.. 30 VDC
Max. output current per channel: 40 mA (Block
signal, short-circuit resistant)
Output frequency: 0.. 25 kHz
Measuring Distance*: 0.5 ± 0.3 mm compared to
coating
Working temperature: - 40° to +125°C
Protection class: IP68Max. cable length (without amplifier): 100 metres
Housing: Stainless steel, material 1.4305
Compressive strength (measuring side): 5 bar.
Max. vibration acceleration (EN61373): 200 m/s2
Shock resistance (EN61373): 2,000 m/s2
* Recommended measuring clearance for 0,3mm
coating thickness
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When used under harsher conditions (in and on the ground, with the likelihood of mechanical stress, mud, etc.) is recommended to equip the sensor with a PUR cable. (Choice of type key is “N”). The cable’s outer casing will then consist of Radox EM104. This is one of the best materials available for a cable jacket.
When used under harsher conditions (in and on the ground, with the likelihood of mechanical stress, mud, etc.) is recommended to equip the sensor with a PUR cable. (Choice of type key is “N”). The cable’s outer casing will then consist of Radox EM104. This is one of the best materials available for a cable jacket.
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