DIN rail-mounted temperature transmitters

Temperature Measurement

March 2002 Temperature Measurement

Instrumentation specialist Endress + Hauser has expanded its iTEMP range of intelligent temperature transmitters to include DIN rail mounted versions of the TMT 121 and TMT 122. This means that several of the items can be grouped next to each other in a control cabinet, as distinct from being scattered throughout the process, which makes programming/configuration more time-consuming.

The iTEMP DIN rail transmitters set new standards when it comes to NAMUR 21 compliance, with galvanic isolation to 2 kV and high accuracy in the ambient temperature range. Due to intrinsic safety certification to ATEX, FM or CSA, the TMT 121 and TMT 122 transmitters are available internationally for application in Ex-areas.

The two new iTEMPs are suitable for applications where standard temperature transmitters can be adversely affected by excessive heat, such as is found in the pulp and paper, as well as the power generation industries. Plug-on terminals for easy installation, set-up connections or HART sockets for swift commissioning and varnished printed circuit boards for long life sets the transmitters apart from their competitors. Selection is provided to allow use of any of 18 different sensor types as a standard option, customer specific linearisation or sensor matching is available for special applications.

Consisting of fixed range, PC programmable, HART, Profibus-PA and Foundation Fieldbus versions, TMT 121 and 122 can be programmed to function with any temperature sensor in the market using Readwin2000 or HART.

A further advantage of the compact transmitters is lower purchasing costs per measurement point as a result of the use of standard transmitter heads. On the technical side, there is a reduction in weight in the head and measurement electronics, which is a significant feature when the measurement point is subject to vibration since the lightweight reduces the chances of metal fatigue. The setup socket in the PC-programmable model is particularly helpful, permitting on-line configuration and enabling easy re-configuration.

In order to guarantee reliable measurement the iTEMP temperature transmitter contains a sensor monitoring system. Sensor rupture or short circuit fault signals can be set in accordance with the Namur NE 43 safety standard.

The keyed transmitter, fitted with fixed terminal screws guarantees user-friendly installation, avoids the hectic search for screws lost due to over-loosening. The iTEMP transmitter range is available with all international hazardous area certificates, and features the facility to stimulate any output current, a great help when testing installations and faultfinding.

Grant Joyce, Endress + Hauser

011 262 8000

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Temperature Measurement

DIN rail-mounted temperature transmitters

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