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JUMO Wtrans
Wireless temperature measurement
– now with a new transmitter and
additional receivers
The Wtrans series from JUMO 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 230V or 24V.
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 868MHz
frequency (Europe) and the 915MHz frequency (USA, Canada,
Australia, New Zealand).
PI 1591 (1/3)
Press Release 1591
JUMO Wtrans
Wireless temperature measurement
– now with a new transmitter and additional receivers
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.
Useful functions ensure ease of use and numerous usage options.
A user-friendly setup program enables the system parameters to
be modified and the required settings to be made. Alternatively, all
functions can be accessed and set using the keys on the receiver
and the display. As a result, parameters such as linearization,
scale start and end, filter constants, offset indicator and slider
(minimum/maximum value memory) can be set separately for each
of the analog outputs. The option of selecting the aforementioned
additional parameters as the trigger for an alarm provides users
with a wide range of application and monitoring options. The two
integrated relays can be used to perform a variety of monitoring
functions. All device outputs are electrically isolated. For the
temperature measurements, the aim was to achieve real-time
behavior for the individual measured values.
The use of an innovative radio transfer technology significantly
reduces the installation effort. Other advantages are clear: Long
connection lines in cable-mounted systems are almost always an
obstacle for the user. Compared to wired solutions, wireless
temperature sensors are an effective, low-cost alternative. Costly,
error-prone cable connections are no longer necessary, and the
radio-based temperature sensor technology also functions in a
rough industrial environment. Compared to wired measurement
data transfer, the costs for maintenance, repair and reinstallation
are lower. The JUMO Wtrans radio technology opens up
completely new areas of application for the transfer of temperature
data.
PI 1591 (2/3)
Press Release 1591
JUMO Wtrans
Wireless temperature measurement
– now with a new transmitter and additional receivers
Further information can be found on the Internet at: www.jumo.net
JUMO_PI_1591.jpg
PI 1591 (3/3)
Editorial Information: Tamara Stauch, Press Office Management
Phone: +49 661 6003-238, Fax: +49 661 6003-682, E-mail: [email protected]
Technical Information: Stefan Käß, Head of International Marketing
Phone: +49 661 6003-689, Fax: +49 661 6003-862, E-mail: [email protected]