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Why Heat?

Freezing Even with traces of water in the medium (as e.g. inthe air) there is a danger of freezing. In order to guarantee a safe and trouble-free operation throug-hout the year, measuring or sample lines and instru-ments have to be heated.

Why Protect? For low long-term cost of ownership it is necessary toextend the life of instrumentation and to minimise plant down-time. Instrument enclosures are designed to help eliminate high maintenance costs. The failure trough freezing of a single critical instrument can shut down an entire plant or process. Heaters in instrument enclosures and protective cabi-nets are designed to provide freeze protection, prevent condensation and maintain constant temperatures.

Freezing Even with only trace amounts of water present, themeasuring or impulse lines may progressivelyfreeze. A freeze-protection heater can function effectively only with suitable insulation present. An instrument enclosure is a form of insulation which can be opened for maintenance and closed securelyas often as required. Condensation Electronic instruments are likely to fail if moisturecollects on the circuit boards. The dew point is likelyto be reached in housings which are exposed to temperature changes in the open air. A heated and insulated enclosure will prevent condensation. Corrosion In the corrosive atmospheres of chemical plants,drops of condensation seldom consist of only pure water. Traces of acid (for example) have a corrosiveeffect even on stainless steel. Condensation Electronic instruments are likely to fail if moisturegets on the circuit board, and the dewpoint is likelyto be reached in housings which are exposed to temperature changes in the open air. Heating the instrument, even with low power, reliably prevents condensation. Solar (UV) Radiation Maximum permissible operating temperatures ofelectronic equipment are often exceeded and not just in equatorial areas. A sunshade is the perfect solution, even in colder climates where direct sunlight is a factor. Temperature In some media the temperature in lines and measu-ring instruments must not fall below a certain point; otherwise a fluid may solidify or condensating com- ponents of a gas might distort the measuring result.

INTERTEC HESS GmbH Raffineriestraße 8D-93333 Neustadt/DonauTel. (+49) 9445/9532-0Fax (+49) 9445/953232e-mail: info@intertec.infowww.intertec.info