Calibration Parameter: Dew point, Frost point, RH%

Traceable to: NIST / SI

Calibration Range: Dew point（-20—+70℃）

Frost point（-25—0℃）

RH（10 to 98% @ 0-70℃）

373LHX Dew Point Hygrometer

• Dual mirror temperature sensors
• Removable mirror module for calibration in liquid
• Heated measuring heads and sampling systems
• High pressures up to 20000 kPa
• Temperature controlled sampling system
• Fast response
• Touch screen full color LCD user interface

Specifications

Measuring Ranges

Frost/Dew Point: -75...95 °C

Temperature: -50...100 °C

Sample pressure: 500...2’000 hPa abs.

Accuracy

Frost/Dew point (for calibrated range): ≤±0.1°C

Temperature: ≤±0.07°C

Reproducibility

Frost/Dew point: ≤±0.05°C

Temperature: ≤±0.04°C

Standard Features

Digital I/O: RS-232

Mirror cooling: 3-stage Peltier thermoelectric

Mirror temperature sensors: Dual Platinum Resistance Thermometer PRT (Pt-100)

Analog outputs: Two analog outputs, user programmable, -10...+10 V and 4...20 mA

Gas connections: 6mm or 1/4’’ Swagelok

Sample gas flow rate: 0...1 l/min

Sample gas circuit: Stainless steel, 316 / 316L, electro polished

Cooling: Refrigeration

Internal pump: Yes

2500 Generator

• 0.5 %RH Uncertainty
• Traceable to NIST
• Self Contained and Mobile
• Automated Control of User Setpoints
• 2500 ControLog® Automation Software
• HumiCalc® with Uncertainty Software
• Computerized Internal Transducer Calibration
• Low Noise Air Compressor with Air Dryer

Specifications

Relative Humidity Range:10 to 95 %RH

Relative Humidity Uncertainty: @ P_c T_c 0.5 %RH

Chamber Temperature Range: 0 to 70 oC

Chamber Temperature Range: (Optional) –10 to 70 oC

Chamber Temperature Uncertainty: 0.06 oC

Chamber Pressure Uncertainty: 0.15% FS

Chamber Pressure Range: Ambient

Gas Flow Rate Range: 5 to 20 L/min

Gas Flow Rate Resolution: 0.02 L/min

Gas Flow Rate Uncertainty: 2% FS

Gas Type: Air or Nitrogen

Gas Pressure Rating (MAWP): 175 psiG

Heating/Cooling Rate: 2.5 Minutes Per oC Average

Chamber Window: 6" x 6" (152 mm x 152 mm)

Air Supply (External): Clean Oil Free Instrument Air @ 175 psiG & 20 L/min

Applications

Used by NIMI, EPRI and academic institute for calibrating hygrometer

Used by dew point instrument manufacturers, humidity sensor and vapor content meter manufacturers for calibrating