{"product_id":"tfma-einschraub-temperatursensor-funk","title":"TFMA screw-in temperature sensor, wireless","description":"\u003cp\u003eThe \u003cstrong\u003eTFMA\u003c\/strong\u003e is a screw-in temperature sensor that sends its reading by radio, manufacturer type Müller \u003cstrong\u003eMETS-WR\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIt is built for measuring points no cable reaches: no signal cable, no supply, no cable route through the plant. The sensor runs from a rechargeable battery and transmits in the license-free \u003cstrong\u003e868 MHz SRD band\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe input is a \u003cstrong\u003ePt100 in 4-wire connection, class A\u003c\/strong\u003e, with a range of \u003cstrong\u003e-50 … +400 °C\u003c\/strong\u003e. The measuring module works with \u003cstrong\u003e16 bit\u003c\/strong\u003e and 0.1 °C resolution at 8 measurements per second; accuracy is \u003cstrong\u003e0.15 % of the range\u003c\/strong\u003e, the temperature coefficient 50 ppm\/K, the filter 0 … 1 s. The radio module transmits at up to 5 dBm (about 3.2 mW) at 19.2 kb\/s.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003erange\u003c\/strong\u003e is \u003cstrong\u003e20 m with the internal\u003c\/strong\u003e and \u003cstrong\u003e100 m with an external antenna\u003c\/strong\u003e – in each case with a clear line of sight; walls, metal and plant components shorten it, and by how much the manufacturer does not say. The external antenna is connected through an SMA plug (option). Two LEDs in red and green under the lens show the state; the device is switched on and off at the top with a \u003cstrong\u003emagnet\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003elithium-ion battery\u003c\/strong\u003e with 3.6 V and 2600 mAh lasts about \u003cstrong\u003esix months at one measurement per minute\u003c\/strong\u003e – and about \u003cstrong\u003e50 days at six measurements per minute\u003c\/strong\u003e. The measuring rate is therefore the most important setting on this device. Without a connector the battery is swapped for charging; with the four-pin M12×1 connector it charges in the device (24 VDC, max. 1 A, about two hours) or the sensor runs permanently from 24 VDC.\u003c\/p\u003e\n\u003cp\u003eMechanically: process connection from 1\/4\" to 1\" as well as 1\/4NPT to 1\/2NPT, protective tube in 1.4571, Ø 6 × 0.5 mm, PBT GF30 housing, PMMA lens with a PA6.6 GF30 screw cap, weight approx. 400 g, system pressure \u003cstrong\u003ePN 25\u003c\/strong\u003e, protection at least \u003cstrong\u003eIP 65\u003c\/strong\u003e with encapsulated boards.\u003c\/p\u003e\n\u003cp\u003eThree points for sizing. \u003cstrong\u003eThe neck tube decides the medium temperature\u003c\/strong\u003e – without one up to 200 °C, with 200 mm up to 400 °C. \u003cstrong\u003eThe battery only charges between 0 and +45 °C\u003c\/strong\u003e, while the device works up to +60 °C; above +45 °C it can therefore measure but not charge. And the ambient temperature is not the medium temperature – the electronics in the head tolerate -20 … +60 °C.\u003c\/p\u003e\n\u003cp\u003eReading out and remote configuration require the \u003cstrong\u003eUSB-RC transceiver\u003c\/strong\u003e (order number 700-00122); it is transmitter and receiver in one and plugs into the PC. The manufacturer names the ETSI directive and the EMC directive 2014\/30\/EU but shows \u003cstrong\u003eno CE marking\u003c\/strong\u003e, and gives \u003cstrong\u003eno radio approval number\u003c\/strong\u003e; no declaration of conformity is available.\u003c\/p\u003e\n\u003ch3\u003eAdvantages at a glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRadio transmission in the 868 MHz SRD band, no signal cable\u003c\/li\u003e\n\u003cli\u003ePt100 4-wire class A, -50 to +400 °C\u003c\/li\u003e\n\u003cli\u003eAccuracy 0.15 % of the range, 16 bit\u003c\/li\u003e\n\u003cli\u003eRange 20 m internal, 100 m with an external antenna\u003c\/li\u003e\n\u003cli\u003eBattery lasting about 6 months at one measurement per minute\u003c\/li\u003e\n\u003cli\u003eCharging in the device or permanent supply from 24 VDC\u003c\/li\u003e\n\u003cli\u003eSwitched on and off with a magnet\u003c\/li\u003e\n\u003cli\u003eSystem pressure PN 25, protection at least IP 65\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57245618733382,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/TFMA_METS-WR_titelbild_229ac3a3-ce21-4990-bacd-638ed12d66fd.webp?v=1788951931","url":"https:\/\/octogon-sensors.com\/en\/products\/tfma-screw-in-temperature-sensor-wireless","provider":"octogon GmbH","version":"1.0","type":"link"}