973sf6_dewpoint

Reliable SF6 Humidity and Purity Measurement
The RH Systems Model 973 SF6 dew point mirror was specifically designed for measurement of humidity and SF6 purity in gas insulated switchgear (GIS) systems. Humidity measurement data is displayed in PPMv, PPMw and dew/frost point at either GIS pressure or standard pressure. Purity measurement is displayed directly in % volume SF6. Both the humidity and purity measurements utilize accurate and reliable condensation techniques.

Gas Recovery
The 973-SF6 is equipped with a gas recovery system that stores the sampled gas during the measurement process in its internal storage tank. After completion of the measurement, the stored gas may be pumped back into the original compartment or into another container. Starting and ending GIS pressures are also measured.

Easy, Automated Usage
User configurable via the full color active matrix LCD touch screen, the 973-SF6 may be configured for measurement of humidity, % volume SF6, or both, with either automatic or manually initiated pump back. Using the bi-directional RS-232 communications port, all measurement data may be easily transferred into a PC for electronic storage and report generation.

Verifiable Calibration
Easily check the calibration at any time using the built-in Ice Test function, providing instant proof of system accuracy and integrity.

Connect and Go
The system is supplied ready for immediate use complete with industry standard quick connect fittings and
sampling tube.

Technical Specifications:

Measuring Ranges:
Frost/Dew Point	-55…+20°C at atmospheric pressure
Humidity content by volume	20…20,000 ppmv
Humidity content by weight	2.5…2500 ppmw
% Volume SF6	80…100%
Pressure	0.1…30 bar abs.

Accuracy:
Frost/Dew point	±0.5°C
ppmv/ppmw	±6% of reading
% Volume SF6	±0.5%
Pressure	0.2% FS

Reproducibility:
Frost/Dew Point	± 0.2°C
% Volume SF6	± 0.3%
Pressure	0.1% FS

Thermoelectric Mirror cooling:	3-stage
Cooling:	Air
Display:	Active Matrix Color Graphic LCD
Digital I/O:	RS-232
Gas couplings:	Quick connect fitting
Mirror temperature sensor:	PRT-100
Sample gas pressure:	1…30 bar
Sample gas flow rate:	0.5…1 l/min.
Operation temperature:	-10…+40°C.
Storage temperature:	-20…+50°C.
Ambient humidity:	90% RH max., non condensing in operation
Voltage:	100…240 VAC, 50/60 Hz.
Power consumption:	200 Watt