The measurement of the water vapor content of a gas by the dew-point technique involves chilling a surface, usually a metallic mirror, to the temperature at which water on the mirror surface is in equilibrium with the water vapor pressure in the gas sample above the surface. At this temperature, the mass of water on the surface is neither increasing (too cold a surface) nor decreasing (too warm a surface).

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The absolute accuracy of the condensation-type (chilled mirror) hygrometer is exceeded only by the gravimetric train, an elaborate absorption system maintained as the primary standard for humidity measurements. Over the mid-range of dew point temperatures (±40°C), the uncertainties of chilled mirror hygrometer measurements are in the order of one part in 100.

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The Model DPH-2020 Industrial Dew Point Hygrometer is a two-stage chilled mirror hygrometer for industrial process or lab applications. Includes NEMA protection of electronics. Dual-line digital display. Pressure rated to 30 PSI. DSP technology provides auto-correction for mirror contamination and "mirror clean" indication. Accuracy = ± 0.1^oC dew point over ± 50^oC; max depression 65^oC. Zero hysteresis. Analog 4-20mA output and digital RS-232 port with graphical PC/Mac real time display software. Includes serial cable. Forced-air cooling with air filtering. Programmable output limit relays for process control automation. NIST traceable. Requires 110/220Vac. Optional microscope available.

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The Model DPH-2020TP Industrial Dew Point Hygrometer with Temperature and Pressure Channels is a two-stage chilled mirror hygrometer with ambient temperature and pressure sensors for industrial or lab applications. Includes NEMA protection of electronics. Dual-line digital display. Pressure rated to 30 PSI. DSP technology provides auto-correction for mirror contamination and "mirror clean" indication. Accuracy = ±0.1^oC dewpoint over ±50^oC; max depression 65^oC. Zero hysteresis. Analog 4-20mA output and digital RS-232 port with graphical PC/Mac real time display software. Includes serial cable. Forced-air cooling with air filtering. Programmable output limit relays for process control automation. NIST traceable. Requires 110/220Vac.

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The Model DPH-2020S Industrial Dew Point Hygrometer System is a two-stage chilled mirror hygrometer with ambient temperature and pressure sensors and integral sampling system. Includes mirror microscope, flow gauge, air pump, filter and EIA Rack/wall mountable chassis, for industrial or lab applications. Includes NEMA protection of electronics. Dual line digital display. Pressure rated to 30 PSI. DSP technology provides auto-correction for mirror contamination and "mirror clean" indication. Accuracy = ±0.1^oC dew point over ±50^oC; max depression 65^oC. Zero hysteresis. Analog 4-20mA output and digital RS-232 port with graphical PC/Mac real time display software. Includes serial cable. Forced-air cooling with air filtering. Programmable output limit relays for process control automation. NIST traceable. Requires 110/220Vac. Dual channel version available.

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The Model DPH-2020TP Industrial Dew Point Hygrometer with Temperature and Pressure Channels is a two-stage chilled mirror hygrometer with ambient temperature and pressure sensors for industrial or lab applications. Includes NEMA protection of electronics. Dual-line digital display. Pressure rated to 30 PSI. DSP technology provides auto-correction for mirror contamination and "mirror clean" indication. Accuracy = ±0.1^oC dewpoint over ±50^oC; max depression 65^oC. Zero hysteresis. Analog 4-20mA output and digital RS-232 port with graphical PC/Mac real time display software. Includes serial cable. Forced-air cooling with air filtering. Programmable output limit relays for process control automation. NIST traceable. Requires 110/220Vac.

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The Model DPT-2011S Dew Point Transmitter System is a complete, turn-key single stage chilled mirror dew point system with integral sampling components. Includes pump, pre-filter and airflow gauge, with 19-inch chassis for EIA rack or wall mounting. Single stage chilled mirror dew point sensor with digital display. Sensor is pressure rated to 30 PSI. DSP technology provides auto-correction for mirror contamination and LED "mirror clean" indication. Accuracy = ±0.26^oC dew point over ±50^oC; max depression 45^oC. Analog 4-20mA output and digital RS-232 port with graphical PC/Mac real time display software. Includes mounting bracket and serial cable. NIST traceable. Requires 110/220Vac, 50-60Hz. A dual-channel version is available.

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The Model OEM-2017 Chilled Mirror Hygrometer is an analog single-stage chilled mirror sensor pressure rated to 30 PSI designed for on-line process sampling, OEM applications. Accuracy = ±0.16°C dew point over –40°C/+50°C; max depression 45°C. Includes analog controller PCB with Class A DIN, 100 ohm PRT resistance output and connecting cable. NIST traceable. Requires 12Vdc. Lot pricing available.

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The Model PMT-2005 Precision Meteorological Thermometer is an aspirated complete precision ambient temperature measuring system with triple-shielded platinum resistance thermometer for outdoor or indoor test chamber applications. Temperature accuracy ±0.06°C over ±50°C range. Sensitivity ±0.01°C. Zero hysteresis. CPU utilizing DSP technology performs continuous, automatic, and unattended ambient temperature measurements. 0-5Vdc analog and digital RS-232 interfaces. NIST traceable.

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The Model MET-2010 Precision Meteorological Thermo-Hygrometer is an aspirated thermo-hygrometer with chilled mirror dew point sensor and triple-shielded platinum resistance thermometer for outdoor or indoor test chamber applications. Temperature accuracy ±0.05°C over ±50°C range. Sensitivity ±0.01°C. Slew rate of 1.5°C/second. Zero hysteresis. Dew point temperature accuracy ±0.2°C. CPU utilizing DSP technology performs continuous, automatic, and unattended ambient temperature measurements, and performs a daily heat cycle. 0-5Vdc analog and digital RS-232 interfaces. NIST traceable. Optional pressure channel available.

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The Model PTU-2000 Meteorological Thermo-Hygrometer is an economical aspirated thermo-hygrometer complete with pressure sensor designed for the meteorologist, climatologist, or atmospheric scientist. It provides accurate and reliable measurements achieving an absolute accuracy of ± 0.2° C in measuring ambient temperature over the entire ± 50° C range, relative humidity accuracy of  
± 2% and pressure accuracy of ± 0.03" Hg. The system consists of an aspirated double-shielded platinum resistance thermometer, polymer capacitance hygrometer sensor, and solid state pressure sensorLinks:

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The Model PVH-2022 Precision Virtual Hygrometer uses the chilled-mirror principle to determine the absolute humidity of any gas in terms of its dew or frost-point temperature. It provides fully automatic measurements and is the first instrument to harness the processing power of the personal computer (PC) to provide flexibility in data collection, presentation, and analysis. The PVH-2022 converts a PC into a complete humidity analysis system and includes a mirror inspection microscope, flow gauge, and graphical display software.

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The Model PMH-2006 Precision Meteorological Hygrometer is a precision ambient dew/frost point measuring system with chilled mirror dew point sensor for outdoor or indoor test chamber applications. It provides the highest accuracy available on the market. Dew point temperatures above 0°C are determined to an accuracy of ±0.2°C, while frost point temperatures down to -70°C have an accuracy of ±0.5°C, using an intelligent, CPU-managed chilled mirror dew/frost point hygrometer sensor. Above 0°C, the hygrometer tracks the dew point temperature; below 0°C, it tracks the frost point temperature. Sensitivity ±0.01°C. Slew rate typically 1.5°C/second. Zero hysteresis. CPU utilizing DSP technology performs continuous, automatic, and unattended ambient dew point measurements, and performs a daily heat cycle. 0-5Vdc analog and digital RS-232 interfaces. NIST traceable.

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