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Dew Point Hygrometer | ThermoFlux – 7089

The Dew Point Hygrometer ThermoFlux – 7089 is a laboratory trainer that measures air humidity using four instruments housed inside a single climatic chamber with a transparent door. It covers psychrometric, hygrometric, and capacitive measurement methods using two mechanical instruments (hair hygrometer with real hair and synthetic fiber) and three electronic instruments (capacitive sensor and wet and dry bulb thermocouples). Chamber humidity is controlled via an ultrasonic atomizer (22 W) for humidification and a Peltier element (58 W cooling capacity, 1600 mm² cooling surface) for dehumidification. This dew point hygrometer enables direct instrument comparison and supports optional PC-based data acquisition using LabVIEW-based DAQ software.

The Dew Point Hygrometer ThermoFlux – 7089 is a laboratory trainer designed to enable students to measure air humidity using four different instruments simultaneously within a single climatic chamber. This dew point hygrometer supports direct comparison of psychrometric, hygrometric, and capacitive measurement methods, providing a comprehensive platform for humidity measurement studies.


Product Overview

The Dew Point Hygrometer ThermoFlux – 7089 is built around a climatic chamber with a transparent door. The chamber houses four humidity measurement instruments: a hair hygrometer with real hair, a hygrometer with synthetic fiber, a capacitive humidity sensor, and a wet and dry bulb thermocouple. All four instruments can be read and compared simultaneously under identical chamber conditions.

The chamber humidity is actively controlled in both directions. Humidification is achieved via an ultrasonic atomizer rated at 22 W with a low-water cut-off. Dehumidification is performed by a Peltier cooling element with a cooling capacity of 58 W at 50°C ambient temperature and a cooling surface of 1600 mm². A recirculation fan circulates air within the chamber to ensure uniform mixing.

Psychrometers operate on the principle of evaporation cooling, comparing ambient temperature with wet bulb temperature. Hair hygrometers use the property of specific fibers to expand with increasing humidity. The capacitive sensor measures changes in the dielectric constant of a layer caused by absorbed water molecules. All three principles are represented in this trainer, making it suitable for direct instrument comparison and methodology studies.

An optional Whirling Psychrometer (TH-3117-01) with a measuring range of -5 to 50°C and 1°C graduation is available as an accessory. Optional DAQ software is available for PC-based data acquisition.

Dew Point Hygrometer ThermoFlux – 7089 — Technical Specifications

Parameter Value
Humidifier Type Ultrasonic atomizer
Humidifier Power Consumption 22 W
Humidifier Safety Feature Low water cut-off
Dehumidifier Type Peltier element
Dehumidifier Cooling Capacity 58 W at 50°C ambient temperature
Dehumidifier Cooling Surface 1600 mm²
Hair Hygrometer (Real Hair) Measuring Range 0 to 100% RH / -35°C to 65°C
Hair Hygrometer (Synthetic Fiber) Measuring Range 0 to 100% RH / 0°C to 70°C
Capacitive Sensor Output Voltage 0 to 10 V
Capacitive Sensor Measuring Range 0 to 100% RH
Dry and Wet Bulb Thermocouple Measuring Range -100 to 400°C

Technical Data

Humidifier

Parameter Value
Type Ultrasonic atomizer
Safety Feature Low water cut-off
Power Consumption 22 W

Dehumidifier

Parameter Value
Type Peltier element
Cooling Capacity 58 W (at 50°C ambient temperature)
Cooling Surface 1600 mm²

Hair Hygrometer with Real Hair

Parameter Value
Humidity Measuring Range 0 to 100% RH
Temperature Measuring Range -35°C to 65°C

Hair Hygrometer with Synthetic Fiber

Parameter Value
Humidity Measuring Range 0 to 100% RH
Temperature Measuring Range 0°C to 70°C

Capacitive Sensor with Digital Display

Parameter Value
Output Voltage 0 to 10 V
Measuring Range 0 to 100% RH

Dry and Wet Bulb Thermocouple

Parameter Value
Measuring Range -100 to 400°C

Key Features

  • Dew Point Hygrometer Configuration: Four humidity measurement instruments in one climatic chamber
  • Mechanical Instruments: Hair hygrometer with real hair, hygrometer with synthetic fiber
  • Electronic Instruments: Capacitive humidity sensor, wet and dry bulb thermocouples
  • Measurement Methods Covered: Psychrometric, hygrometric, capacitive
  • Climatic Chamber: Transparent door, adjustable humidity
  • Humidification: Ultrasonic atomizer, 22 W, with low water cut-off
  • Dehumidification: Peltier cooling element, 58 W cooling capacity at 50°C ambient
  • Cooling Surface: 1600 mm²
  • Air Circulation: Recirculation fan for uniform air mixing
  • Hair Hygrometer (Real Hair) Range: 0 to 100% RH, -35°C to 65°C
  • Hair Hygrometer (Synthetic Fiber) Range: 0 to 100% RH, 0°C to 70°C
  • Capacitive Sensor Range: 0 to 100% RH, output 0 to 10 V
  • Wet and Dry Bulb Thermocouple Range: -100 to 400°C
  • Direct Instrument Comparison: All four instruments readable simultaneously under identical conditions
  • PC Connectivity: Optional DAQ software with electronic sensors included
  • Software Environment: National Instruments LabVIEW, Windows compatible

Experiments

  • Measuring methods for air humidity measurement:
    • Psychrometric humidity measurement
    • Hygrometric humidity measurement
    • Capacitive humidity measurement
  • Characteristic variables to describe air humidity
  • Changes of the state of humid air in the h-x diagram

Construction and Design

The Dew Point Hygrometer ThermoFlux – 7089 is constructed around a climatic chamber with a transparent door as its core element. The chamber houses all four humidity measurement instruments, enabling simultaneous readings under identical conditions. An ultrasonic atomizer rated at 22 W with a low-water cut-off provides humidification. A Peltier cooling element with a 58 W cooling capacity and 1600 mm² cooling surface performs dehumidification. A recirculation fan circulates air within the chamber to maintain uniform mixing throughout all measurements.

Two mechanical instruments are included: a hair hygrometer using real hair and a hygrometer using synthetic fiber, both covering 0 to 100% RH. Three electronic instruments are fitted: a capacitive humidity sensor with a 0 to 10 V output, and wet and dry bulb thermocouples with a range of -100 to 400°C. The psychrometer principle in this dew point hygrometer is based on evaporation cooling, comparing ambient and wet bulb temperatures. The capacitive sensor detects changes in the dielectric constant of a layer caused by absorbed water molecules.


Software

ThermoFlux – 7089 Software (Optional)

  • Developed in the National Instruments LabVIEW environment
  • Designed specifically for data acquisition with this apparatus
  • Records, stores, and calculates experimental results
  • A set of electronic sensors is included when the software option is selected
  • Compatible with any Windows operating system

Scope of Delivery

  • 1 experimental unit
  • 1 instructional material

Optional Accessories

Item Model Measuring Range Graduation
Whirling Psychrometer with Thermometer ThermoFlux – 7089/01 -5°C to 50°C 1°C

Q1: How many humidity measurement methods does the Dew Point Hygrometer ThermoFlux – 7089 support?
The unit supports three methods: psychrometric, hygrometric, and capacitive. Four instruments cover these methods, and all can be compared simultaneously under the same chamber conditions.

Q2: How is the climatic chamber humidified and dehumidified?
Humidification is performed by an ultrasonic atomizer rated at 22 W, fitted with a low-water cut-off. Dehumidification is carried out by a Peltier cooling element with a 58 W cooling capacity at 50°C ambient temperature and a cooling surface of 1600 mm².

Q3: What is the measuring range of the capacitive humidity sensor?
The capacitive sensor measures 0 to 100% RH with an output voltage of 0 to 10 V and includes a digital display.

Q4: Is the DAQ software included as standard?
No. The ThermoFlux – 7089 software is optional. When selected, it includes the required electronic sensors and runs on any Windows operating system in a LabVIEW environment.

Q5: Is a psychrometer available as an accessory?
Yes. A Whirling Psychrometer with Thermometer (ThermoFlux – 7089/01) is available as an optional accessory, with a measuring range of -5 to 50°C and a graduation of 1°C.

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