Michell Instruments Ltd. - PRODUCT NEWS


New cooled mirror hygrometer for anti-icing systems of gas turbines.

The new generation of the Optidew Hygrometer from Michell Instruments was designed especially for applications in anti-icing systems for stationary gas turbines.

In power generation plants located in environments with low temperatures and high relative humidity, there is a risk of ice forming in the air intake systems, leading to many potential problems. Firstly the accumulation of ice on the filter elements will block the filter and lead to loss of power through a drop of pressure and reduced mass flow. In turn this will lead to reduced thermal efficiency. In extreme cases, chunks of ice may be ingested into the compressor and cause physical damage to the turbine.

Protecting against icing is vital to prolonging the life and efficiency of the gas turbine. Ice protection systems vary between de-icing and anti-icing, the latter usually featuring a precision hygrometer such as the new Optidew for Anti-icing Systems.

Applying the fundamental cooled-mirror measurement principle, it delivers a repeatable, drift-free dew point or relative humidity measurement. The robust design of the new Optidew hygrometer for anti-icing systems is capable of withstanding the most demanding conditions and guarantees minimal maintenance while retaining the performance and sensitivity of a high-level laboratory reference hygrometer. When compared to a traditional polymer RH probe, the Optidew Anti-icing version offers far better accuracy and stability.

The new Optidew hygrometer for anti-icing systems has a wide dynamic measurement range from –50°C to +90°C dew point over a temperature range of –10°C to +90 °C and was successfully tested in the extreme atmospheric conditions.

Optidew for anti-icing provides two 4-20 mA output signals, configurable through the instrument’s interfacing software to dew point and temperature or relative humidity and temperature. The RS232 interface allows connection to custom data logging and configuration software, operating under a Windows™ environment.

Optidew’s design also takes into account contamination, which can compromise the accuracy of many cooled mirror dew-point meters, and as such, features Michell’s state of the art Dynamic Contamination Correction (DCC) System. The DCC System automatically eliminates any error that may be caused by mirror particle contamination, and intelligently adapts itself to accommodate even the dirtiest of processes.

About Michell Instruments
Michell Instruments is the international leader in the field of moisture and humidity measurement solutions. With over 30 years experience, Michell designs and manufactures a wide range of transmitters, instruments and system solutions capable of measuring trace moisture, humidity and dew point in a vast range of applications and industries ranging from compressed air, power generation, process, oil and gas, pharmaceutical and many more. With a fast growing international subsidiary and distribution network, Michell provides solutions in moisture and humidity to the most demanding customers across the globe.

About Rense Instruments
Rense Instruments is an industry leader in the development and production of humidity and temperature measuring sensors, humidity portable and laboratory instruments and calibration transfer standards. Rense Instruments was acquired by Michell in January 2006 and completes Michell Instruments product range in humidity solutions. Rense instruments expertise spans over three decades focusing on serving customers with solutions for HVAC, energy management, storage and many other general industry and OEM applications.

Michell Instruments Limited
48 Lancaster Way Business Park,
Ely, Cambridgeshire CB6 3NW. UK
Tel: +44(0) 1353 658031 Fax: +44(0) 1353 658199
website: www.michell-instruments.co.uk

September 2008

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