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Position sensing

Specialized in inclinometer and other position sensors

Headquartered close to the Munich airport, the German ASM develops and produces position sensors. In February, the company with worldwide sales partners has introduced its PTDM5 dual-axis inclinometer, which provides CANopen or J1939 compliant CAN interfaces. This product is a member of the Positilt family, and it is based on MEMS (micro-electro-mechanical systems) technology. The measurement range for the dual axis version is capable of ±60°; while the single axis version has a ±180° measuring range. Both models are available for smaller measurement ranges in ±15° increments, too. The resolution is 0,05° with a linearity of ±0,5°.

INCLINOMETERS THAT ARE USED IN OUTDOOR APPLICATIONS such off-highway equipment or wind power systems must be designed to handle severe weather conditions, temperature fluctuations and tough contamination. Therefore the PTAM5 tilt sensor comes with a robust stainless steel housing to protect it for these adverse factors. The sturdy enclosure for this inclinometer is rated IP67/69K, with an optional IP68 rating. The inclinometer is installed with four M8 bolts.

The CANopen version of the inclinometer (PTDM5) supports LSS protocols for setting the node-ID and the bit-rate. The node-ID and the bit-rate are also configurable by means of SDO, which may cause problems if the configuration is done in a running system. The default node-ID is 127, which is often used by CANopen devices with NMT master function. It features all PDO transmission types including cyclic and a-cyclic communication. The provided static TPDO mapping is compliant to CiA 410 (version 1.2), the CANopen profile for inclinometers. The inclinometer is CiA 301 certified by CAN in Automation (CiA).

The J1939 version of the inclinometer uses for the operating parameters a proprietary A-message (peer-to-peer), and for the process data a proprietary B-message transmitted in broadcast with user-configurable PGN (parameter group number).

Stainless steel tape position sensor

ASM has also launched the the WB10ZG stainless steel tape position sensors series (member of the Positape family) featuring a 2000-mm measurement range. The products comes in 2” x 2” x 3,3” housing, which is IP65-rated (IP67 with mating connector). The sensor consists of a specially produced stainless steel tape that is taken up onto a precision machined drum. With its high degree of flexibility, the steel tape offers a high lifetime and is well suited in applications where pulleys are required due to space constraints that prevent the direct inline measurement. In areas where icing can occur, the flat, smooth surface of the tape also allows for the quick removal of ice accumulation. The standard tape brush continuously wipes the tape surface to remove debris.

Digital interfaces compliant to CANopen and J1939 are available. The output linearity is ±0,05 % full scale over the 6,5 feet measurement range. At the heart of this position sensor is a magnetic encoder that translates the linear motion in an electrical signal. The sensor is resistant to 100 g (100 shocks in 11 ms,) and 20 g (10 Hz to 2 kHz, 10 cycles vibration). The product is suitable for use in a wide range of applications with harsh environments and tight locations typically associated with off-highway vehicles and machinery.

Worldwide representation

With around 80 employees at ASM's headquarters in Moosinning near Munich, and at sales offices throughout Germany, France and the UK, the company manufactures both off-the-shelf products and customized solutions. The sensor-maker has in most European and North American countries sales partners. Also in China and India distributors present the company. Recently, ASM has appointed „MT“ LLC in Russia as distributor. This company has consulting experience in several industries.

Besides the above-mentioned families, there are the Posiwire (cable extension position sensors), the Posichron (magnetostrictive position sensors), the Posimag (magnetic scale position sensors), and the Posirot (magnetic angular sensors) families.

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