Simply connect the two wire sensor lead to the computer and
for accurate calibration set 20 m/A that’s it!
The new Shaw sensor connects directly to a factory computer
line to measure the amount of moisture in dry air or gas without the need for a
separate power supply or hygrometer.
With the sensor in room air, Shaw Automatic Calibration has
entered the range of -80 deg c. which is less than 1 part per million of water
vapour, to 0 deg c.
Type. SSDIR. In line 2 wire 4-20 mA.
SSDIR: -80 to 0 degrees centigrade dew point at room pressure.
available on request.
Accuracy. Guaranteed better than 1 part per
million on dry air or gas.
Sensor type. Shaw Grey spot. Calibrated
20 years life, Gold plated with fine gold filter. 2
Weather proof rating. IP 65. Blue anodised
Dimensions. 64 mm diameter. 170 mm overall
Weight. 370 g.
Resolution 0.01 mA.
lead. 20 m/A. Length up to 1 Km.
Connection. Lemo 2 pin
Power supply. 18/30 volt dc. Scada/DCS computer
Sample pressure. To 10 bars. preferably one litre per
atmosphere to avoid errors due to pressure
Output. Fully isolated from process computer, acts as
4-20 mA proportional to dew point, on a 2 way power
Any Shaw moisture sensor can be used in the connector provided.
The new SSDIR, Dry air hygrometers, water vapour pressure
hygrometers scaled in milli-bars and pascals, Peltier cooled mirror hygrometers
and Shaw Automatic Calibration were invented by Leonard Shaw,
Professor of Hygrometer Technology,
The Royal Institution of Great
Shaw have the World's largest Hygrometer sales.