Hygrometer

In the production, processing and preservation of highly specific materials and raw materials that are susceptible to mold, measuring and checking humidity regularly is essential. The best tool to support this task is a hygrometer . Let’s  find out with TECHMASTER what features this humidity measuring device has!

What is a hygrometer?

A hygrometer is a device used to measure the amount of water in a material or environment. A hygrometer helps us know the humidity level of an object or space. A hygrometer is also called a hygrometer. This is an extremely important device in industrial production activities.

Structure of hygrometer a Hygrometer

A hygrometer, regardless of type, has the following basic components:

• Sensor: This is the main part of the hygrometer, responsible for measuring humidity. The type of sensor used will depend on the operating principle of the hygrometer. There are different types of sensors such as:
  • Resistive sensors: Based on the change in resistance of a substance when exposed to moisture.
  • Capacitive sensor: Based on the change in capacitance of a substance when exposed to moisture.
  • Temperature and humidity sensor: Combines both functions, measuring both temperature and humidity.
• Electronic circuit: Processes the signal and displays the result as a percentage of humidity.
• Display screen: Displays humidity measurement results, accurately and clearly showing measurement results.
• Power source: Provides energy for the machine to operate, can be battery, accumulator or direct power source.
• Case: Protects internal components and gives shape to the machine.

Illustration of the structure of a hygrometer:

General operating principle

1. Environmental Contact Sensor: Direct contact with the environment and any material to be measured.
2. Sensor changes: As the humidity changes, the physical properties of the sensor also change.
3. Electronic circuit processing the signal: Processed by the electronic circuit and converted into humidity value.
4. Display results: The humidity value is displayed on the machine’s display.

Types of moisture meters and their typical structures

• Air humidity meter: Usually has a compact design, the sensor is placed in a position that is easily exposed to the air.
• Wood moisture meter: Has a metal probe to plug into the wood, the sensor is usually located at the probe.
• Soil moisture meter: Has a rod or fork-shaped probe that is inserted into the soil, the sensor is usually surrounded by a layer of porous material to absorb moisture.
• Grain moisture meter: Usually has a sample tray, the sensor is placed below the tray or integrated into the tray

Working principle of moisture meter 

The device is based on the principle of digital sensors with advanced technology depending on the specific model. Here are two common operating principles:

–  Using a capacitive sensor : Consists of two thin metal plates insulated by a layer of hygroscopic material. When the humidity changes, the conductivity of this material layer also changes. At this time, the meter will measure the change and calculate the most accurate humidity.

• Advantages: This method gives high accuracy and fast response time.
• Disadvantages: Capacitive sensors can be affected by dirt and chemicals.

–  Using optical sensors : Using a beam of light that is projected onto a thin film coated with a luminescent substance. When the humidity in the air changes, the luminescence of this substance also changes.

• Advantages: Less affected by dirt and chemicals than capacitive sensors.
• Disadvantages: The accuracy of this method may be lower than that of capacitive sensors.

Popular types of moisture meters on the market

Currently, depending on the object to be measured, people divide moisture measuring devices into the following types:

1. Air humidity meter

An air hygrometer  is a device used to measure indoor or outdoor air humidity. In addition, it supports the analysis and research process of the meteorological department on climate, weather, etc. Some hygrometers are also equipped with other sensors to measure other parameters such as temperature, dew point, atmospheric pressure, etc.

1. Wood, sawdust, wall, concrete meter

Distributed by TKTECH usually uses resistance measurement technology. There are 2 ways to measure wood moisture as follows:

• Uses a bimetallic resistor inserted into the wood to measure the wood’s resistance. The resistance of wood changes with moisture content, so the moisture meter can calculate the wood’s moisture content based on the measured resistance value.
• Contact uses metal probes that are inserted into the wood and measure the change in the wood’s capacitance as the moisture content changes.

2. Moisture meter for cereals and agricultural products

Grain and agricultural product moisture meters are often chosen by consumers to measure the moisture content of: cashews, coffee, flour, rice, pepper, etc.

3. Moisture meter for cotton, fabric, fiber

This device has a wide variety of designs and models with optimal structural designs for use in measuring different types of fabrics. This group is often used in the garment industry.

4. Coal and chemical meter

Coal and chemical moisture meter is a special device to measure the exact temperature in solid objects such as concrete, coal, chemicals and it is widely used in construction, wood and paper manufacturing… and other related industries.

Some quality measuring devices of Testo brand

Testo’s humidity measuring devices will be the perfect choice for checking and monitoring temperature and humidity in your work. You can refer to some of the following products:

Testo 606-1 measuring device

Compact, impressive design with accurate measurement results should be used for measuring moisture of wood and building materials.

– Two electrodes firmly inserted into wood and building materials help measure moisture accurately on each percentage of dry mass

– HOLD function helps freeze measured values ​​for easy comparison by users

– Quality screen backlight supports measurement in low light environments

– Protective bag cover and belt help store equipment safely and durable

– Accurately measures the moisture content of many types of wood: oak, spruce, larch, beech, pine, maple

– Additional curves help locate the wet spot of cement screed, concrete, gypsum, concrete anhydrite, cement mortar, lime mortar, bricks

Testo 645 temperature and humidity measuring instrument

If you need a device with full functions of measuring temperature, humidity and displaying parameters of relative humidity, absolute humidity, dew point, humidity level, temperature. Then this is the number 1 choice for your above request.

– Scope of application: monitoring temperature and humidity values ​​in production, storage, cold storage, containers, locations susceptible to mold in residential areas and constructions

– The machine has a compact, handheld design, convenient for work in tight areas.

– High accuracy humidity measurement up to ±1%RH

– Internal data memory of the device: 3000 measured values

– Convenient for data analysis through software (Optional)

– Measurement values ​​can be printed directly when connected to a Testo thermal printer.

Testo 440 Bluetooth Humidity Meter

If you need a temperature measuring device, this Testo 440 kit is recommended. It will help you to check all the parameters of indoor air quality. Measure air flow accurately and quickly.

– The product includes a Testo 440 multifunction meter and a Bluetooth® temperature and humidity probe

– Clearly structured menu, for long-term measurements.

– Determine temperature and humidity in parallel

– Calculate dew point, wet bulb temperature and absolute humidity accurately

– Convenient with internal memory, wireless probe and USB port for data export

– The Testo 440 can be expanded with a large portfolio of digital probes.

Testo 605i Temperature and Humidity Meter

Applied new technology, compact, smart design with sturdy shell, used with smartphones and tablets.

– Accurately measure humidity, air temperature in rooms, ducts, HVAC air conditioning systems. Users can easily identify locations susceptible to mold through light signals on the screen.

– Automatic calculation of dew point and wet bulb temperature via the testo Smart Probes App

– Measurement data is analyzed and sent via the testo Smart Probes App

– Bluetooth ® connection range up to 100m.

Air Hygrometer 184 H1

This is the best device to help you monitor the transportation of goods in a limited space.

– Simple operation: “Start” button to start recording data and “Stop” to end

– Unlimited operating time

– All in the data logger: PDF measurement data, configuration file and user manual

– Generate PDF report immediately after connecting to computer

– Complies with GXP, 21 CFR part 11 and HACCP standards

– Communicate with phone via NFC.

If you need to buy a genuine Testo moisture meter, choose Techmaster. We are the distributor of genuine Testo brand products to the market. Ensure that the goods have clear documents of origin. Good warranty policy with extremely reasonable prices. Quickly contact us via hotline or visit the website: https://techmaster.com.vn/  for detailed information about the product.