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G2 Dew Point Generator

rh-systems-g2-dew-point-generator

RH Systems 373 Dew Point Mirror

Overview

The 373 Dew Point Mirror is a precision hygrometer exploiting advances in digital technology to satisfy the highest requirements in the measurement of humidity. As a true laboratory reference instrument, the 373 relies on proven optically detected chilled mirror techniques.

The 373 is available in a number of different models including: 373LHX, 373LX, 373L, 373S3, 373S, 373H, and 373HX. See table below for specifications for each model.

Graphic Display

  • Full Color Hi-Resolution LCD Touch Screen
  • User Selectable Display Parameters
  • Parameters Selectable as Numeric or Graphic
  • User Selectable Units

The system uses an active matrix 640×480-pixel full color liquid crystal display with an integral touch panel. It has a high contrast ration and a wide viewing angle for easy readability. Data is displayed with large, easy to read characters. Using the on screen menus, you can configure the display for for a variety of humidity, temperature, and pressure parameters. The parameters can be viewed in either numeric or graphic (strip chart style) format. System units are user selectable and may be set to any combination of SI and non-SI units.

Features
Specifications
Downloads
Digital Measurement and Control of Mirror Temperature

The reflected light from the mirror is continuously measured by a high resolution A/D converter to detect the dew/frost layer thickness. This digital signal is then used in the control algorithm to properly drive the peltier element, establishing and maintaining the dew thickness at the equilibrium point. The mirror temperature is measured by a 100-ohm platinum resistance thermometer which is connected directly to a high accuracy, high precision A/D converter. The resistance of the thermometer is measured by the A/D converter and used, along with calibration coefficients, to computer mirror temperature.

Optimum Response Injection System (ORIS)

ORIS allows for faster measurements at low frost points, generally below about –60ºC. Typically, at these low frost point conditions, a chilled mirror hygrometer must cool the mirror to a value well below the actual frost point temperature in order to start the condensation process on the mirror. But due to the low water vapor content of the gas, it can take a very long time to establish a suitable frost layer on the mirror, then stabilize it at the proper equilibrium temperature. This can often take in excess of several hours. And the lower the frost point, the longer it takes.

Two-Pressure Two-Temperature Hybrid Humidity Generation Technique

Utilizing the uniquely combined benefits of the two-pressure and two-temperature techniques, humidity is generated by fully saturating gas at a known temperature and pressure, then reducing the pressure to a lower value (typically ambient) and cooling or warming to an alternate temperature.

Humidity produced by this hybrid technique is determined from measurements of the temperatures and pressures alone, and does not rely on measurement of the water vapor content of the gas.

With RH Systems’ hybrid humidity generation technique, the G2 is a true humidity reference instrument suitable for high accuracy calibration, product conditioning, and test applications.

Simple Application Integration

The G2 is supplied in a 19″ rack mountable format for integration within commercially available rack systems. A 19″ rack enclosures is available as an option. All electrical, fluid, and pneumatic connections are made at the back panel of the instrument. All fluid and pneumatic connections are via industry standard Swagelok fittings.

Generator Ranges:
Frost/dew point*-25 …+20°C
Relative humidity10…95 %RH
Flow rate5 …100 l/min
Saturator pressureAmbient …12 bar
(Ambient …175 psia)
Measurement Ranges:
External temperature sensor-50 …+100 °C
External pressure sensor700 …1,200 mbar
(10.2 …17.4 psia)
Performance:
Dew point stability≤ ±0.02 °C
RH stability≤ ±0.1 %RH
Pressure stability≤ ±1 mbar
(≤ ±0.015 psia)
Saturator temperature stability≤ ±0.01 °C
Flow control≤ ±0.5% of full scale
Response time10 …90 %RH: < 5 min
Standard Features:
External temperature sensor(s)Up to 3 simultaneous sensors, 100 ohm PRT
Pressure sensorInternal with 1/8″ Swagelok connection
Saturator water levelAutomatic level control, 1/4″ Swagelok water inlet
Gas Connection, inlet1/4″ Swagelok, internally pressure regulated
Gas connection, outlet1/2″ Swagelok, internally flow regulated
Control and data acquisitionOptional touch screen controller and/or PC software
Size6U, 19″ rack mountable module
Digital I/O3, simultaneous, independent RS-232 connections
Additional Information
Power requirements208-240 VAC, 50-60 Hz, 1500 W
Input pressureMax. 16 bar, oil free
Operation temperature*-10 …+40 °C (must be higher than generated dew point)
Storage temperature-20 …+50 °C
HumidityMax. 98 %RH, non-condensing
Weight and Dimensions6U 19″ Module / With enclosure
Height:267 mm (10.5″) / 318 mm (12.5″)
Width:483 mm (19″) / 533 mm (21″)
Depth:559 mm (22″) / 616 mm (24.25″)
Weight:53 kg (117 lbs) / 70 kg (154 lbs)
* Highest generated dew point is limited by ambient room temperature

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