Programmable temperature transmitters
June 2004
Temperature Measurement
Non-programmable (analog) temperature transmitters are based on an analog design and can only handle one temperature range and one sensor (eg, a pt100 with a temperature range of 100°C). They are subject to drift and the potentiometer slides out of calibration due to vibration. It is difficult to keep stock for so many different applications and delivery times are therefore a problem.
Analog temperature transmitters are traditionally very specific, companies cannot keep stock for all the different applications and delivery times are too long. On the other hand, programmable transmitters are able to adapt and cater for all the different applications. With these there is no longer a need to keep a broad stock of transmitters, as they can be re-programmed to suit numerous different application scenarios. Delivery times are not a problem - but programmable temperature transmitters can often cost as much as three times that of the analog versions. Novus is now offering its programmable transmitters at an affordable price.
Programmable temperature transmitters are based on a digital design and are therefore not subject to drift. They can handle any temperature range, any sensor and can be re-programmed via a PC to suit any new application (eg, a pt100 with a temperature range of 100°C or a thermocouple with a temperature range of 200°C). Stock of different transmitters is not required and availability is not a problem.
Novus' new range of programmable temperature transmitters bridges the gap between programmable and analog transmitters. They are priced to compete with analog transmitters, and are claimed to be a fraction of the cost of typical programmable transmitters.
The TxBlock and TxRail comprise a family of head mount and DIN rail mount transmitters for the most common temperature applications. One single model can be configured to accept all thermocouple types and Pt100 RTDs. The transmitters are available with a 0 to 10 V output or a 4 to 20 mA output. They can be powered by an external power supply of between 18 and 30 V and can be loop powered. There is also an isolated (Txirail) version that is isolated between the sensor and the transmitted current/voltage.
All units are easily configurable via a PC. The output of the transmitter is scalable to different input ranges. Input type, working range and output calibration can be achieved by means of a cable and an RS232 port from a PC. Novus transmitters are distributed in South Africa exclusively by Unitemp.
For more information contact Willem Krige, Unitemp, 021 762 8995, [email protected], www.unitemp.com
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