Product guide

67
Humidity and Dew-Point Instruments
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
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Calibration
S904
Relative Humidity and Temperature Generator for Calibrations
The S904 humidity and temperature generator is designed
to calibrate and verify the operation of relative humidity
sensors and transmitters. With a chamber temperature range
of +10 to +50°C (+50 to +122°F), a uniformity of ±0.1°C
(±0.02°F) and the ability to generate 10–90% RH, accurate
and repeatable calibrations are made easy.
Highlights
• Relative humidity and temperature controlled chamber
• Excellent stability within chamber: ±0.2% RH,
Temp. ±0.1°C (±0.02°F)
• Optional in-built data-logging for reference probe and
probes under calibration
• Probes with body diameters between 5 to 25mm (0.2 to
0.98”) can be accepted
Technical Specifi cations
Humidity
Generator range 10-90% RH
Accuracy
Control element
±1% RH (10–70% RH)
±1.5% RH (70–90% RH)
Stability ±0.2% RH (20–80% RH)
Temperature
Generator range +10 to +50°C (+50 to +122°F)
(lowest T set point = 10ºC (18°F) below
ambient)
Accuracy ±0.1°C (±0.2°F)
Stability ±0.1°C (±0.2°F)
Chamber
Ramp rate from
+20 to+ 40°C (+68 to +104°F)
+40 to +20°C (+104 to +68°F)
1.5°C / minute (2.7°F / minute)
0.7°C / minute (1.2°F / minute)
Control element Removable relative humidity sensor
General
Probe ports up to 5 – sensor body diameters 5 to
25mm (0.2 to 0.98”) accommodated by
port adapters
Chamber volume 2000cm
3
(122.1in
3
)
Chamber dimensions 105 x 105 x 160mm (4.13 x 4.13 x 6.3”)
(wxhxd)
Instrument dimensions 520 x 290 x 420mm (20.5 x 11.4 x 16.5”)
(wxhxd)
Set point resolution 0.1 for humidity and temperature
Displays 3 digit LED, 10mm (0.39”) characters
Supply 85–264 V AC, 47–63 Hz, 150 VA
Weight 20kg (44lb)
Dimensions
Issue No: S904_97200_V3_UK_0811