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Temp transmitter with HART protocol

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article image TMT 162 temperature transmitter with sensor.

THE new TMT162 temperature measurement transmitter from Endress+Hauser comes standard with a high-intensity backlit LCD for ease of reading under all operating and environmental conditions.

The 4-20mA, 2-wire loop powered device also includes HART functionality offering faster commissioning along with on-line set-up and re-configuring facilities.

Designed for installation across a range of applications, the TMT162 is a dual channel device offering a digital measurement accuracy of 0.1K for Pt100 sensors from -50 to +200°C. Built-in surge protection protects it from overvoltage surge damage.

Explosion-proof, Ex d, and intrinsically safe, Ex ia, the device will accept two-sensor inputs for 2 x Pt100 3-wire or Pt100 4-wire and TC connection capabilities. All internationally accepted approvals are available and EMC is to NAMUR NE21 standards.

Primary temperature measurement capability is provided by independent two-sensor inputs and include a facility for over- and under-range results. Sensor input channels can also be mathematically combined for differential and average value measurements.

The unit's measurement software will also identify a faulty sensor as well as any increase in terminal resistance, such as corrosion of sensor terminals or supply cabling, according to the European chemical industry standards NAMUR NE43.

As a back-up to the primary measurement system, the transmitter features drift warning and drift alarm capabilities. Maximum allowable drift parameters can be preset by the user to suit site conditions. Automatic switching from sensor 1 to sensor 2, on failure, can be enabled.

In drift warning mode, any violation of the presets activates a warning using the HART protocol and also displays an 'attention' symbol on the display. A breach in drift alarm mode activates an alarm using the 4-20mA signal as well as an error code on the display panel, according to NAMUR NE89.

The specially-designed large-character display panel also includes bargraph output facilities and is designed to be easily read from greater than average distances, day or night.

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