Product category:
Wireless data transmission
News Release from: Jumo Instrument Company | Subject: JUMO Wtrans
Edited by the Processingtalk Editorial
Team on 15 February 2008
Wireless temperature measurement in
industrial use
The Jumo Wtrans RF temperature probe was developed so that temperature measurements can be transmitted in future without needing any wiring - truly wireless
The Jumo Wtrans RF temperature probe, type T01.G1, is suitable for mobile or stationary measurement of temperature at movable and fixed locations, and works with the matching T01.EC1 multifunction receiver The transmitter is built into the probe handle, and is protected by a waterproof housing
This article was originally published on Processingtalk on 17 Jul 2007 at 8.00am (UK)
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Industrial wireless temperature measurement
The JUMO Wtrans RF temperature probe and the matching multifunction receiver were developed so that industrial temperature measurements can be transmitted in future without any wiring
Control in the food industry
Various scandals in connection with processing and transporting food have resulted in ever tighter regulations: so a recording function has been integrated into the Jumo Imago F3000 process controller
The transmission frequencies which are used are largely insensitive to external sources of interference, and permit transmission even in tough industrial environments.
The transmitter is designed as an insertion probe.
The probe is available with fitting lengths from 50 to 500 mm, and includes a platinum chip resistor as the sensing element.
Further reading
Jumo Imago 500 process and programme controller
Eighteen months application has seen the Imago 500 expand to eight controller channels: it is now increasingly used not just as a process controller, but also for more general operational functions
High resistance platinum chip temperature sensors
With the higher resistance of Jumo PT 2000 and PT 5000 sensors, a greater resolution can be achieved since changes in temperature can be better tracked by the measuring or control equipment
The transmitter can cover a temperature measurement range from -30 to +85C.
In order to take account of the presently applicable legislation and comply with the existing regulations and industrial standards, an RF solution was selected that uses a proprietary protocol in the ISM band on frequencies of 868MHz (Europe) or 915MHz (Australia, Canada, New Zealand, USA).
The receiver (for DIN-rail mounting) provides the measurements on four analogue outputs (0(4) - 20mA, 0 - 10V) and via an RS485 interface that uses a Modbus protocol.
Each receiver can handle up to 16 Wtrans transmitters (insertion temperature probes), through the RS485 interface.
Useful functions ensure comfortable operation and a widespread range of possible applications.
System parameters can be varied and the necessary and required settings can be made through an easy-to-use setup programme.
Alternatively, all the functions can also be called and adjusted by means of the keys and displayed on the receiver itself.
It is thus possible to set parameters such as linearisation, scale start and end, filter constants, offset and drag pointer (minimum/maximum value storage) separately for each analogue output.
The possibility of selecting one of the above-mentioned or other parameters as the trigger for an alarm opens up a wide range of application and monitoring options for the user.
All outputs on this instrument are electrically isolated.
The temperature measurement is aimed at providing the real-time response of the individual measurement variables.
The implementation of a very future-oriented RF transmission technology leads to a considerable reduction in installation expenditure.
Other advantages are obvious:.
* Long connecting cables in wired systems are almost always a nuisance for the user.
Here, RF-based temperature sensors offer an effective and economical alternative, compared with wired solutions.
* Expensive and interference-prone cable connections are eliminated, and the RF-based temperature sensor technology continues to function even in tough industrial surroundings.
* Costs for new installations, service and repair are reduced by comparison with cable-borne measurement data transmission.
Jumo Wtrans wireless technology opens up fully new application areas for the transmission of temperature data.
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