2-wire transmitters handle Ex and normal areas
A
Jumo Instrument Company product story
Edited by the Engineeringtalk editorial team
Sep 15, 2000
Jumo Instruments is introducing a new 2-wire temperature transmitter for companies with mixed hazardous and non-hazardous environments; it comes in standard, Ex, HART and HART Ex versions
Jumo Instruments is introducing a new 2-wire transmitter for companies with mixed hazardous and non-hazardous environments.
The dTRANS T01 is so flexible and reliable that Jumo believes sales will quickly outstrip those of all its other transmitter ranges.
Up to now, users have either had to buy expensive transmitters with hazardous area (Ex) approval for use throughout their installations, or they have had to settle for transmitters of different specifications, often from different manufacturers, and to train their operators on the use of each type.
Jumo's dTRANS T01 is one of the first off-the-shelf transmitters available in standard, Ex, HART and HART Ex versions.
This means that users can mix and match according to the requirements of their installations, with the benefit of lower costs (because they do not need to buy the top level specification throughout) and a single, standard mode of operation for all transmitters.
As a result, less training is required, so saving time and costs.
All versions are universal programmable transmitters for mounting in temperature probes with Form B terminal heads.
They will thus be ideally suited for use by probe manufacturers, the chemical, oil and petrochemical industries.
The Ex version has approval for use in hazardous areas, while the HART versions (available with standard HART and HART Ex certification) place a digital signal over the analogue 4mA signal, allowing it to be used in large hazardous area plants.
A particular feature is that the input and output signals are isolated.
This is a major advantage because, unlike many other transmitters on the market, there is no need for separate rack-mounted opto isolators.
The measuring input can be freely configured for resistance thermometers, including Pt100, 500 and 1000, and Ni100, 500 and 1000 in 2, 3 or 4-wire circuits; and for a wide range of thermocouples.
The output can be linearised to allow optimisation of the process and default values can be set to protect against alarm conditions such as short circuits.
Standard features include freely configured measuring ranges, customised linearisation and probe circuit monitoring (using a sensor short-circuit, sensor open circuit and cable open circuit brake).
There is also a facility for subsequent fine tuning and high interference immunity.
All types can be configured using Jumo's standard PC set-up program, running under Microsoft Windows.
Programming is either done using a set-up interface cable or, in the HART versions, via the HART protocol with HART modem.
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