Calibration Instruments
HG1
Humidity Calibrator
A low-cost, easy to use, fully integrated system for the
calibration of dew-point and relative humidity sensors
from 2 to 90% relative humidity, -30 to +20°Cdp (-22 to
+68°Fdp).
Air Source Dryer Generator Reference
The reference instrument comes supplied with a software
suite that provides real-time monitoring, charting and
logging capabilities via a built-in RS232 communications
port.
Operation of the HG1 Humidity Calibrator is based on a
simple, yet reliable, principle: a source of dry air is split
into two streams, one of which is humidifi ed by bubbling
it through a water saturator. The two air streams are
then volumetrically mixed to produce an air fl ow of fi xed
humidity, dependent upon the mixing ratio selected on
the HG1's front panel-mounted fl ow meters.
The HG1 includes an integrated air pump to draw in
ambient air, which is passed through a single column
of desiccant. Alternatively, a dry air source, such as
instrument air or bottled nitrogen, can be connected to
the gas inlet to boost the low-end capability down to
-40°C (-40°F) dew point and increase the amount of time
before the desiccant requires regeneration.
The HG1 can be supplied with a built-in chilled mirror
reference instrument to provide a fundamental
measurement of the generated dew point when absolute
accuracy is required. The chilled mirror reference sensor
is mounted directly into the sample chamber.
The HG1's integrated test chamber can accommodate a
variety of humidity sensors (dimensions opposite) also, as
an alternative to the integrated calibration chamber, the
unit is supplied with a gas-outlet feed to supply calibration
air to an external manifold or system.
The maintenance of the HG1 is simple. When saturated,
the desiccant changes color, indicating that it needs to
be regenerated which is done by heating in an oven. The
saturator water level is monitored from the rear of the unit
and an easy top-up arrangement is provided.
Highlights
• Integrated chilled mirror reference hygrometer
• Straightforward operation
• Allows quick verifi cation tests of humidity sensors
• Transportable
www.michell.com
Calibration Instruments
HG1
Technical Specifi cations
Calibration range 2 to 90% RH (–30 to +20°Cdp (–22 to +68°Fdp)
@ +21°C (+69.8°F) ambient
Reference accuracy Typically ±2% of reading (% relative humidity),
0.2°Cdp, 0.1°C ambient temperature
(with Optidew reference hygrometer)
Calibration Through traceable calibration of integrated
Optidew reference hygrometer, to NPL and NIST
Operating temperature +10 to +35°C (+50 to +95°F) ambient
Power 90 to 120V AC @ 60Hz or
220 to 260V AC @ 50Hz
Calibration chamber Steel with gasket seal
120 x 120 x 250mm (4.7 x 4.7 x 9.8”) (h x w x d)
Overall dimensions Painted aluminum case
305 x 520 x 400mm (12 x 20.5 x 15.7”)
(h x w x d)
Sample fl ow rate 4 Nl/min for the sensor cell
Weight 20kg (44lbs)
Dimensions
Front View
520mm
305mm
Top View
400mm
268mm
128mm
Michell Instruments Ltd, Rotronic Instruments Corp. 135 Engineers Road, Suite 150, Hauppauge
NY 11788 Tel: 631 427 3898, Email: us.info@michell.com, Web: www.michell.com/us
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
Issue No: HG1_97158_V2.1_US_0718
© Michell Instruments 2018
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