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HART-based temperature transmitter

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article image Easily read from a distance.

A ROBUST, HART-based, field-mount temperature transmitter and indicator with a high level of functionality, suitable for temperature measurement in all industries, has been released by Endress+Hauser .

The TMT 142 has a brightly illuminated display which shows the measured value day or night with large bold digits allowing it to be read from a distance. The display also includes a percentage bar graph and engineering units, so there is no doubt about the measured value.

The TMT 142 is accurate over the entire operating range, = 0.2 ºC as standard (optional: = 0.1 ºC). The transmitter offers excellent system accuracy with custom transmitter/sensor matching.

This sensor matching calibration is a simple procedure using the free-of-charge ReadWin 2000 software tool to automatically calculate coefficients for polynomial or Callendar - Van Dusen equations from the measured values.

Galvanically isolated input up to 2000V is standard for the TMT142 and it has passed rigorous EMC testing to provide reliable performance even in the noisiest electrical environments.

Power supply voltage is continuously monitored on the 4-20mA loop to ensure reliable power to the transmitter and the alarm is raised if the power supply voltage drops too low.

The sensor circuit is also continuously monitored with built in corrosion detection (4-wire RTD or TC only). The analogue output signal can also differentiate between over-range, fault and error signals, according to Namur NE43 standards.

The robust new single chamber housing design is available in aluminium or stainless steel with Ex d or Ex i hazardous area approvals, suited to applications in the oil and gas industry.

The temperature sensor may be directly connected to the housing in a "head mount" style, or remotely connected via one of the three cable gland entries. The transmitter may be easily wall or pipe mounted with mounting lugs cast directly on the housing body.

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