Hydraulic pressure sensor uses thin film technology

Paul Boughton
New from Sensor-Technik is the STW M01, a thin-film pressure transmitter engineered for the harsh conditions that are typical of mobile hydraulic applications. Sensors are available for pressure ranges from 0-25 to 0-800bar, all with a robust all-stainless-steel construction designed to withstand severe levels of shock, vibration and electromagnetic interference. Despite these attributes, the M01 is a low-cost device that is suitable for high-volume applications, and it is also available as an OEM version.
All sensors operate over a wide -40 to +125 degrees C temperature range, and full temperature compensation is provided from 0 to 80 degrees C, guaranteeing accuracy within 1.0 per cent of full scale. Even beyond the compensated range the sensor's output can still be relied on, with a maximum error of 2.5 per cent of full scale over the full operating temperature range. This means that the M01 can be trusted to monitor hydraulic systems on vehicles that operate in true extremes of climate. All devices are amply protected against overpressure, with all but the largest devices withstanding twice their rated pressure.
Sensors are available with a choice of analogue outputs to cater for a variety of applications. Current outputs of 0 and 4-20mA are available for two- and three-wire measurement techniques, and voltage outputs can be specified as 0-10, 0-5 or 0.5 to 4.5V. All types are short-circuit protected.
The M01 sensor's connections are similarly flexible, with three different choices of electrical connector, plus cable output and three different choices of pressure connection, including G 1/4 and 1/4 NPT. Depending on these choices, the sensors exhibit ingress protection of either IP67 or IP69k.
In terms of standards compliance, the M01 is manufactured in accordance with ISO/TS 16949 and complies with EN 69000-6-2 and -3 for electromagnetic compatibility. Mechanical shock rating is 500g per IEC 60068-2-27 and vibration rating is 20g per IEC 60068-2-6 at resonant frequency.
For more information, visit www.sensor-technik.co.uk

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