Humidity Calibration Solutions - Michell Instruments
Humidity Calibration Solutions - Michell Instruments
Humidity Calibration Solutions - Michell Instruments
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<strong>Calibration</strong> <strong>Instruments</strong><strong>Humidity</strong> <strong>Calibration</strong> <strong>Solutions</strong>The Importance of Regular <strong>Calibration</strong>The reliable operation of a hygrometer and indeed anymeasuring instrument, can only be verified by periodiccalibration against a dependable reference system. Allhygrometers from <strong>Michell</strong> <strong>Instruments</strong> are delivered with acalibration certificate, but this alone will not guarantee themeasurement performance throughout their life. Exposureto contaminants within the measurement of gas can causemeasurement performance errors. To have confidence inthe performance of a sensor it must be verified by periodiccalibration.<strong>Michell</strong> <strong>Instruments</strong> <strong>Calibration</strong> Services<strong>Michell</strong>’s UKAS (United Kingdom Accreditation Service)laboratory was established back in 1986 and was the firstlaboratory in the UK to be accredited for the dew pointcalibration of hygrometers. The capability of the <strong>Calibration</strong>laboratory has been maintained and developed over the yearsand <strong>Michell</strong> can now offer calibrations over the range –90°Cto +90°C dew point with a best measurement capability of±0.15°C dew point. In addition to this <strong>Michell</strong> can providetraceable calibrations to NIST (National Institute for Standardsand Technology – USA).<strong>Calibration</strong> StandardsEach country will hold its own National Standard for dewpoint and humidity. This may be a primary standard. Othercalibration facilities will have reference instrumentationcalibrated against the Primary Standard and use this as theirstandard. In this approach a pyramid structure is generated.This structure gives confidence in the calibration process astraceability of calibrations is visible.<strong>Calibration</strong> PyramidNationalStandardPrimaryStandardNational <strong>Humidity</strong>Standard @ NPLBackground to <strong>Michell</strong> <strong>Instruments</strong><strong>Michell</strong> <strong>Instruments</strong> is the international leader in the field ofmoisture and humidity measurement solutions. With over30 years experience, <strong>Michell</strong> designs and manufactures awide range of transmitters, instruments and system solutionscapable of measuring trace moisture, humidity and dewpoint in a vast range of applications and industries rangingfrom compressed air, power generation, process, oil and gas,pharmaceutical and many more.With a fast growing international subsidiary and distributionnetwork, the <strong>Michell</strong> Group provides solutions in moisture andhumidity for the most demanding applications worldwide.<strong>Michell</strong> uses three key dew point measurement technologies intheir products:• Impedance method using a ceramic tile which deliversunrivalled speed of response and robustness.• Chilled Mirror method which has been incorporatedinto advanced, precision instruments for industrial andlaboratory use.• Quartz crystal technology for a high precision, fastresponding moisture measurement with self-calibration.Applications for calibration instruments• Metrology Laboratories• Meteorology Laboratories• <strong>Calibration</strong> Laboratories• Industrial Gas Producers• Pharmaceutical Companies• <strong>Humidity</strong> Sensor / Instrument Manufacturers• ... and many moreReferenceStandardWorkingStandardMeasuringInstrumentSecondary<strong>Calibration</strong>Accredited<strong>Calibration</strong>Traceable<strong>Calibration</strong>NPL CalibratedhygrometerS4000Dew-pointGeneratorDG-2Hygrometerunder testEasidew TX© 2010 <strong>Michell</strong> <strong>Instruments</strong>
The TechnologyAll the calibration systems and generators offered by <strong>Michell</strong><strong>Instruments</strong> generate a gas that is suitable for the calibrationof sensors by gas dilution. This method works by mixingdifferent volumes of wet and dry gas then performing acheck with a reference instrument to produce a gas of knownhumidity which can then be used to calibrate other humiditysensors. Both trace moisture and high-humidity gas can beproduced using this method, with traceability of calibrationachieved through the reference instrument.Particulatefilterdry flowvalve meterReferenceSensorTestSensorDry Gas Invalvewet flowmeterSaturator<strong>Calibration</strong> InstrumentationA comprehensive range of calibration systems for thecalibration of trace moisture dew-point sensors to relativehumidity sensors.The modular system of components enablessystems to be designed to specific performance requirementsand for the provision for everything from dry gas source to atransfer standard reference hygrometer.© 2010 <strong>Michell</strong> <strong>Instruments</strong>
<strong>Calibration</strong> <strong>Instruments</strong><strong>Calibration</strong> Systems• Relative humidity or dew-point calibration systems• Wide range of dew point and humidity can be generated• Portable calibrators• Self-contained calibrators• Reference instruments with calibration traceable toNational Standards• Complete system designComponents – Dew-Point andRH Generators• Manual, semi-automatic and PC controlled systems• Comprehensive generation range from trace moisture tohigh humidity• Excellent generation stability• Can be supplied as a stand-alone or system componentsReference Instrumentation• Transfer standard reference hygrometers• Fundamental chilled mirror measurement technology• UKAS accredited calibration as standardAuxiliaries• Mini-compressor package• Pressure swing dryers• Temperature chambers• Sensor manifoldswww.michell.com
<strong>Calibration</strong> <strong>Instruments</strong><strong>Humidity</strong> SaltsFixed humidity<strong>Humidity</strong> RangeOperating Temp. (ambient)Stability12, 33, 55, 75, 90%RHtypically +21°C
<strong>Michell</strong> <strong>Instruments</strong> operatesin the following markets:• Compressed Air Dryers• Pharmaceutical• Standards Laboratories and Metrology• Semiconductors• Natural Gas and Petrochemicals• Industrial and Pure Gas Production• Power GenerationOther Product RangesDew-Point Transmitters<strong>Michell</strong> offers the widest range of dew-point sensors and transmitters on themarket. From the industry standard Easidew 2-wire transmitter to the new,rugged Easidew PRO IS for hazardous areas, all are supplied with sensorstraceable to national standards.Portable <strong>Instruments</strong><strong>Michell</strong>’s range of easy-to-operate portable instruments provides fast, accurateand stable measurement of dew point, relative humidity and moistureconcentration. They are designed to satisfy the most demanding industrialconditions, and are unique in the market for giving repeatedly fast response tolow dew points.Chilled Mirror <strong>Instruments</strong>Chilled Mirror is a fundamental measuring technology offering the userexceptionally accurate, reliable and repeatable measurements from tracemoisture to high humidity. <strong>Michell</strong> offers a range of instruments based on arugged sensor design that is equally suitable for installation in demandingprocess environments or for use as an accurate reference instrument in aNational Standards Laboratory.Process Analysers<strong>Michell</strong>’s range of analyzers is specifically designed to provide reliable onlinemeasurement in process applications such as dedicated water and hydrocarbondew-point determination in natural gas. Three sensing technologies are used:the Ceramic Impedance sensor for measurements in gas and liquid phase;Quartz Crystal Microbalance for trace moisture in process gases and the DarkSpot Chilled Mirror for hydrocarbon dew point.Oxygen Analyzers<strong>Michell</strong> brings you the very latest technologies in oxygen measurement,designed to give years of reliable and accurate service in laboratory, processand flue gas applications. From instruments featuring a unique sealed referencezirconia sensor to a transmitter with the latest generation thermo-paramagneticoxygen and thermal conductivity technology, all <strong>Michell</strong> oxygen analyzers areavailable in a range of different configurations.Relative <strong>Humidity</strong> <strong>Instruments</strong><strong>Michell</strong>’s own RH sensing technology provides excellent resolution, longterm stability and speed of response. We offer a wide range of humidity andtemperature measuring sensors and instruments, including relative humiditytransmitters, humidity and temperature transmitters as well as handheldindicators. The humidity generator range includes the most stable humiditygenerator on the market.<strong>Michell</strong> <strong>Instruments</strong> 48 Lancaster Way Business Park, Ely, Cambridgeshire, CB6 3NWTel: +44 1353 658000, Fax: +44 1353 658199, Email: uk.info@michell.com, Web: www.michell.com/uk<strong>Michell</strong> <strong>Instruments</strong> adopts a continuous development programme which sometimes necessitates specification changes without notice.Issue no: <strong>Calibration</strong> <strong>Instruments</strong>_97140_V2.1_UK_0210© 2010 <strong>Michell</strong> <strong>Instruments</strong>
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