RH Systems DP-19 Dew Point Instrument
- Typical Application
- Measurement Principle
- Standard Version
- Standard Equipment
- Other Versions
The model DP-19 is a robust, easy to carry dew point hygrometer, specially designed for field use.
A typical application of this instrument is the spot measurement in sulphur hexafluoride (SF6). Measurements are made at pressures between 10 mbar and 10 bar (1 kPa to 1 Mpa). Sample gas flow is effected by pressure difference between gas inlet and outlet, with a minimum of 10 mbar (1 kPa). If sample gas pressure is too low or the gas has to be measured in a closed circuit, an optional gas pump is available.
The measurement is based on the chilled mirror principle which guarantees direct and precise measurement of the actual humidity with no errors due to inertia and hysteresis. The system is stable and does not require recalibration. A built-in ice test device with simple push button action allows the instrument to be checked for accuracy at 0ºC.
The standard version of the DP19 instrument includes a front-mounted, pressure-tight measuring head with triple stage Peltier cooling. An important option is the unique ORIS-device for the rapid stabilization of the dew point at very low humidity's (patented). For the measurement of aggressive gases, the whole gas circuit is made of PTFE and stainless steel. A built-in electronic flowmeter, which works independent of position, monitors the correct gas flow. An analog output of ± 10 mV/ºC is provided for recording or remote indication. For the transport of the instrument and its accessories, a carrying case is available as an option.
The standard equipment for SF6 measurement consists of:
Other versions for the measurement in compressed air systems or similar installations with filters and special tubing depending on customers requirements are also available.
-60ºC max at 10ºC ambient temperature
-55ºC max at 20ºC ambient temperature
-45ºC max at 35ºC ambient temperature
Values valid for measurements at atmospheric pressure, at overpressure slightly less.
|Accuracy:||< ± 0,2°C, ± 1 digit (standard)|
|Reproducibility:||< ± 0, 1°C, ± 1 digit|
|Readout:||Digital, 3½ digits|
|Analog Output:||± 10 mV/°C, 0°C = 0 mV, mA optional|
|Measuring Principle:||Dew Point Mirror, rhodium plated, optical detection|
|Cooling:||Thermoelectric, Peltier-Battery, 3 stage|
|Sample Gas Flow Rate:||15 to 60 l/h, norminal 30 to 40 l/h|
|Sample Gas Pressure:||Min. 10 mbar up to 10 bar (1 kPa to 1 Mpa)|
|Response Time:||2°C/sec. max.|
|Mirror check:||Manual check by pressing the "MIRROR CHECK" - key|
|Instrument Check:||Manual cooling and precision check by pressing the "TEST COOLING" - key (on mirror check position with open measuring head)|
|Voltage:||100/ 110/ 127/ 200/ 220/ 240 VAC ± 10%, 50/ 60 Hz|
|Power Consumption:||approx. 160 watts|
|Ambient Temperature:||-10...+50°C for storage and operation|
|Ambient Humidity:||Max. 90% RH, non condensing|
|Weight:||Approx. 12 kgs|
|Size:||342 (W) x 140 (H) x 326 (D) mm|