Product category:
Humidity and Environmental Sensors
News Release from: Michell Instruments | Subject: Easidew, Transmet, Cermax and Pura
Edited by the Engineeringtalk Editorial
Team on 07 October 2003
Hygrometers gain cool calibration option
Hygrometer products from Michell Instruments are now available with traceable calibration to -90C dew point.
For 20 years, Michell's humidity calibration systems have been maintained traceable to the premier national standards held by the National Physical Laboratory (NPL), London and the National Institute of Standards and Technology (NIST), Washington, USA For much of that time the lowest achievable humidity level claimed by both NPL and NIST has been -75C dew point, which is equivalent to 1ppm of moisture in dry gas
This article was originally published on Engineeringtalk on 15 Feb 2000 at 8.00am (UK)
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Recently the NPL has extended its capability down to -90C dew point (0.1ppmV) and now offers a UKAS (United Kingdom Accreditation Service) calibration facility to that low level.
As part of a strategic investment into the capability to produce high performance hygrometry for the pure gas and semiconductor industry, Michell has had its primary transfer standard hygrometer, a S4000 TRS cooled mirror dewpointmeter, successfully calibrated at NPL to this new low limit and can now offer traceable calibration to -90C dew point on all its low-end hygrometer products.
Instruments to benefit from this extension of traceability are the Easidew, Transmet, Cermax and Pura product ranges.
Pura in particular is designed for use in high purity gas applications and is, Michell believes, the only such product to benefit from traceability to a national standard down to 0.1ppmV (in the semiconductor industry known as 100 parts per billion).
Over the coming months Michell will be applying this extended measurement capability to its own United Kingdom Accreditation Service (UKAS) accredited humidity calibration laboratory and expects to be able to offer UKAS calibrations to -90C dew point from early in 2004, giving a complete range from 100ppb to 25,000ppm (-90 to +20C dew point). Request a free brochure from Michell Instruments ...
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