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Temperature Transmitter, Wtrans
Temperature Transmitter, Wtrans
The Wtrans series from JUMO GmbH & Co KG contains a new transmitter with M12 connection for adaptation to existing Pt 1000 resistance thermometers. Additional receiver designs are also available, which have two rather than four analog inputs, but also have two relays for a variety of monitoring tasks and are suitable for supply voltage of either 230 V or 24 V. The transmitters are located in a probe handle and are protected by a watertight housing. The radio frequencies used are largely non-sensitive to external disruptive influences and permit transfer even in a rough industrial environment. The probe with a fixed protective tube is designed as an insertion measurement probe and is available with an installation length of 50 to 1000 mm. A platinum chip resistor is used as a high-precision measurement element. On the transmitter side, a functional temperature range of -30 … +260 °C has been achieved with a fixed protective tube, and a functional temperature range of -100 … +500 °C with M12 connector and remote probe. The permitted ambient temperature range for the electronics is -30 … +85 °C. To take account of currently valid legislation and to comply with existing norms and industry standards, the Wtrans system has a proprietary protocol and operates in the ISM band on the 868 MHz frequency (Europe) and the 915 MHz frequency (USA, Canada, Australia, New Zealand). The mounting rail receivers provide the measured values via four analog outputs [0(4) … 20 mA, 0 … 10 V] or two analog outputs and two floating relays as well as via the RS485 interface with Modbus protocol. For each receiver, up to 16 Wtrans transmitters (insertion temperature probes) can be managed via the RS485 interface.