{"product_id":"tmma-oberflachensensor-hart-magnet-mets-wsm","title":"TMMA Magnetic Surface Sensor with Display (METS-WSM)","description":"\u003cp\u003eThe \u003cstrong\u003eTMMA\u003c\/strong\u003e is a surface temperature sensor on a magnetic base with a display and two limit contacts, manufacturer type Müller \u003cstrong\u003eMETS-WSM\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIt is placed on pipes, motors, and housings where no drilling is allowed – attached instead of installed, without interfering with the medium. The spring-loaded measuring surface \u003cstrong\u003eØ 6 mm\u003c\/strong\u003e with 1.5 mm travel presses onto the surface, and the Alnico 500 magnetic base holds with \u003cstrong\u003e66 N\u003c\/strong\u003e. The sensor body is made of stainless steel \u003cstrong\u003e1.4571\u003c\/strong\u003e; with approx. \u003cstrong\u003e259 g\u003c\/strong\u003e, \u003cstrong\u003ePN 25\u003c\/strong\u003e and at least \u003cstrong\u003eIP 65\u003c\/strong\u003e for the electronics, the mounting position is arbitrary.\u003c\/p\u003e\n\u003cp\u003eThe device features a four-digit 7-segment display with a head that can be \u003cstrong\u003erotated by approximately 330°\u003c\/strong\u003e and a display that can be mirrored by 180°. Settings are made on the device using \u003cstrong\u003ethree buttons\u003c\/strong\u003e or via HART; the measured value can be read on-site without a host computer. The \u003cstrong\u003etwo limit contacts\u003c\/strong\u003e operate as PNP or NPN with 30 VDC and 200 mA; switching delay and failsafe can be set up to \u003cstrong\u003e999.9 s\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eMeasurement is performed with a \u003cstrong\u003ePt100 in 4-wire circuit\u003c\/strong\u003e in classes A, B, and AA in the range \u003cstrong\u003e-50 … +200 °C\u003c\/strong\u003e with a smallest span of 50 K. The output is \u003cstrong\u003e4 … 20 mA with HART\u003c\/strong\u003e in the 2-wire loop; the accuracy of the measuring amplifier is \u003cstrong\u003e0.3% of the range\u003c\/strong\u003e at 16 bits. The sensor is powered from the HART current loop with \u003cstrong\u003e12 … 40 VDC\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore ordering, please note:\u003c\/strong\u003e The ambient temperature is not the medium temperature – the measuring surface can withstand up to +200 °C, but the electronics in the head only up to +80 °C, and above +85 °C they can be damaged; the sensor sits with the magnet directly on the hot surface, the source does not say how much heat reaches the head. How the adhesive force of 66 N changes with temperature is not documented; the fastening must be checked before use on hot surfaces. Galvanic isolation applies only between switching outputs and measuring amplifier, not against the loop and not against the surface on which the magnet sits. Two limit contacts are only available with M12 five- and eight-pole as well as MIL; a cable gland is not listed. The data sheet only mentions up to -50 … +250 °C on request. For configuration, the \u003cstrong\u003eHART interface with USB and software\u003c\/strong\u003e (01310-00220) is used. A CE mark, a declaration of conformity, and explosion protection are not documented in the data sheet. The identical version without display and buttons is the \u003cstrong\u003eTMMB\u003c\/strong\u003e (METS-WTM).\u003c\/p\u003e\n\u003ch3\u003eAdvantages at a glance\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003eAttached instead of installed – magnetic base with 66 N from Alnico 500\u003c\/li\u003e\n\n\u003cli\u003eFour-digit display, head rotatable by approx. 330°, three buttons or HART\u003c\/li\u003e\n\n\u003cli\u003ePt100 4-wire, classes A, B, and AA, medium -50 … +200 °C\u003c\/li\u003e\n\n\u003cli\u003e4 … 20 mA with HART, accuracy 0.3% of range\u003c\/li\u003e\n\n\u003cli\u003eTwo limit contacts, switching delay up to 999.9 s\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"octogon GmbH","offers":[{"title":"Default Title","offer_id":57356931858758,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/TMMA_produkt_81355919-023e-421b-8b55-2077eb02789f.webp?v=1789243717","url":"https:\/\/octogon-sensors.com\/en\/products\/tmma-oberflachensensor-hart-magnet-mets-wsm","provider":"octogon GmbH","version":"1.0","type":"link"}