Michell Instruments S4000 Specifications
Chilled Mirror Instruments
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S4000 TRS
Precision Dew-Point Hygrometer
A precision laboratory dew-point hygrometer with the ultimate accuracy, reliability and long
term performance for humidity measurement and calibration.
Highlights
• 0.1°Cdp accuracy (0.18°Fdp)
• Measurement range: -100 to +20°Cdp
(-148 to +68°Fdp)
• Precision 100 Ω 4-wire platinum resistance
thermometer
• Dual optics detection system
• Available with VCR couplings for optimum trace
moisture sampling
• Dual multi-function LED display with unit
indicator
Applications
• Standards Laboratory reference instrument
• Research and development
• Battery manufacture
• Industrial gases
Chilled Mirror Instruments
S4000 TRS
Precision Dew-Point
Hygrometer
The Laboratory Standard
The S4000 TRS offers unmatched accuracy and reliability in
dew-point measurement and calibration. The powerful threestage Peltier thermoelectric heat pump, coupled with integrated
auxiliary refrigerant cooling, gives an effective measurement
range down to -100°C (-148°F) dew point.
Dual Optics for Supreme Sensitivity
At low frost points the rate of formation of frost on the mirror
surface is extremely slow. As a result other chilled mirror dewpoint meters may give reduced accuracy, poor control stability
and extremely long response times at low moisture levels. The
S4000 TRS is unique in that it utilizes a dual optics detection
system. This greatly increases the sensitivity of the optical loop.
Response, stability and sensitivity are improved by orders of
magnitude at low frost points.
Calibration Integrity
The S4000 TRS is unique amongst dew-point hygrometers. It
is the only instrument that is delivered, as standard, with a full
UKAS certificate providing official traceability to the UK National
Standard. UKAS is the United Kingdom member of European
Co-operation on Accreditation (EA), the International Laboratory
Accreditation Cooperation (ILAC) and the International
Accreditation Forum (IAF). As an additional benefit, the S4000
TRS has a direct traceability path to the NIST (Washington DC,
USA) National Humidity Standard.
No other hygrometer provides such comprehensive traceability
to a worldwide network of standards organizations. The S4000
TRS is used by many of these organisations as part of their own
humidity referencing systems.
Contamination Compensation
Any optical system carries a risk of contamination. The
S4000 TRS automatically compensates for any such buildup with its ABC (Automatic Balance Compensation) System.
ABC ensures continuous optimum operation of the sensor by
periodically driving off condensation to allow the optical loop
to be rebalanced. When the contamination level is too high a
visible alarm is generated. The sensor optical system may be
cleaned with distilled water or a suitable high purity solvent
such as acetone. ABC cycle time, duration and recovery time
can all be adjusted according to the type of application to
minimize the effect of contamination risk. The S4000 TRS also
features a sophisticated data hold system, which maintains the
instrument’s signal outputs during an ABC cycle, allowing the
S4000 TRS to be used for process control applications.
Unbeatable Measurement Capability
The S4000 TRS uses a highly accurate 4-wire PT100
temperature sensor and has a proven measurement capability of
better than ±0.1°C (±32.18°F) dew point.
Visual Verification
Every S4000 TRS is delivered complete with an M4K Viewing
Microscope. Fitting neatly into the sensor viewing port, this
microscope allows the user to confirm the presence of water or
ice on the mirror surface.
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