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Product informationA major chemical company with global operations uses Endress+Hauser temperature sensors and transmitters in their production processes.

A plant located in Alabama is one of the single largest installations for the TMT 182 head transmitters (up to 350 units). In the last three years or so, the TMT 182’s haven’t had a single failure or quality issue which was not the case with their previous suppliers.

ApplicationThis particular plant is involved in the production of Isopherone, Polyester, Cyad and Silanes. Silanes are commonly used as a filler, a performance additive in paints, coatings and silicone rubber. These products may also be used in light bulbs, toner cartridges, cosmetics and catalysts. Other applications include use as a coupling agent for adhesives, sealants and fiberglass. This facility is a fully back-integrated production facility to fulfill the growing requirements of the NAFTA market.

Even though this company uses only head transmitters worldwide, the Operations En-gineers are asking their I&E counterparts to start using transmitters with displays. The operations people really like the TMT 162 due to its bright and large display provid-

ing excellent readability (large digits) even under poor visibility conditions. They also like the bar graph feature because that gives them a clear indication of the ballpark range of the reading if they are not interested in a specific value.

The company recently bought 8 TMT 162’s and are pleased with the results. The new TMT 142 was also shown to the customer, and they are considering using it for some applications.

BackgroundPreviously, the customer was using head transmitters from a competitor. These transmitters were not only expensive, but also for specific sensor input only. With the Endress+Hauser TMT 182 head transmitter, the customer drastically cut down inventory of transmitters in stock.

Instrument descriptionThe TMT 162 is an ideal transmitter and indicator for temperature measurement. Its large brilliant blue backlit display allows operators to view measured values from a distance, in bright sunlight, at night, or in poor visibility situations.

Capable of various inputs including RTD, TC, resistance and mV, the TMT 162 converts signals into a scalable 4 to 20 mA output signal. Its high reliability in harsh

industrial environments make the dual compartment housing ideal for hazardous areas.

The TMT 162 is capable of single or dual sensor input. Dual sensor input means transmitter can accept input from two dif-ferent sensors at the same time. Mathemat-ics functions for differential and average temperature add flexibility to the measure-ment. Temperature sensor drift monitoring and sensor back-up functionality improve measurement reliability.

Operation and set-up are simple by using a HART® handheld DXR 275/375 or re-motely using a PC with Readwin software. Readwin software is provided free of charge with every unit and does not require a license or upgrade fees.

For more information contactEndress+Hauser, Inc. 317-535-7138 www.us.endress.com

Typical chemical plantTMT 162TMT 162 installed in process

Field and head temperature transmittersTemperature transmitters in a chemical plant

USA

Endress+Hauser, Inc.2350 Endress PlaceGreenwood, IN 46143Tel. 317-535-7138Sales 888-ENDRESSService 800-642-8737Fax 317-535-8498inquiry@us.endress.comwww.us.endress.com

Canada

Endress+Hauser, Canada1075 Sutton DriveBurlington, ON L7L 5Z8Tel. 905-681-9292800-668-3199Fax 905-681-9444www.ca.endress.com

Mexico

Endress+Hauser México, S.A. de C.V.Av. Gustavo Baz No. 43 Fracc. Bosques de Echegaray Naucalpan de Juárez, C.P. 53310, Estado De México Tel. (52) 55-5371-1110 Fax (52) 55-5371-1128 mexico@mx.endress.com

Why use a transmitter?

Reduce wiring costsThermocouple extension wires are expensive and transmitters will reduce the number of wires required for 3 and 4 wire RTDs. If you do not use a transmitter, you will need sensor extension or compensation wires to the control system for a precise temperature measurement. These wires are expensive and sometimes fragile. By using a transmitter, you only need inexpensive copper wiring. Keep in mind that the greater the distance between the sensor and the control system, the more money you can save.

Eliminate plant noiseTCs and RTDs provide very small signals from the sensor which are very susceptible to EMI and RFI noise found in most installations. Electromagnetic interference (EMI) and Radio Frequency Interfer-ence (RFI) are present in almost all industrial plant environments. Their effects on the extension/compensation wire obviously affect the measured value, and as such, cannot be ignored. Common sources include transformers, various AC and DC motors, weld-ing equipment and radio communications equipment. EMI and RFI emissions may be negatively affecting your plant, particularly if direct wiring of instrumentation is used. RTD and thermocouple sensor signals are relatively small in magnitude and hence more susceptible to being affected by various EMI/RFI interference. Fur-thermore, sensor lead wires can contribute to the problem by acting as an antenna and actually drawing additions amounts of spurious EMI/RFI into the sensor circuit. Any extraneous EMI/RFI “picked up” by the measurement circuit will cause an erroneous tempera-ture measurement, and at high enough levels, a plant shutdown.On the other hand, an installation using temperature transmit-ters is able to withstand greater levels of EMI/RFI. A transmitter accomplishes this by converting the low-level (ohm or mV) sensor signal into a relatively robust and high magnitude signal, which is typically a 4 to 20 mA analog signal or digital fieldbus signal. All Endress+Hauser transmitters are electromagnetically compliant to IEC 61326, Amendment 1, 1998 and NAMUR NE21. Using transmitters, an RFI/EMI source may affect the signal, but within the nominal transmitter accuracy specification.

Reduce control systems costsAnalog I/O input cards are less expensive than RTD and TC input cards.

Allows sensor flexibilityOne programmable temperature transmitter will accept 12 TC types, 6 RTD types, mV and ohms inputs, making it easy to change sensors to match changing applications.

Avoid ground loopsTransmitters provide electrical isolation between the sensor and the measurement instrument or controller. iTEMP transmitters provide up to 2 KV of isolation between the sensor and control system.

TMT 162 transmitter with gold-plated terminals

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