WVTR-01B Dressing Water Vapor Transmission Rate Test Chamber

Product Features

Advanced Technology

Employing a new generation of air-blowing humidity control system, the humidity within the test chamber reaches a minimum of 5%RH.

Wide-range, high-precision, automatic temperature and humidity control, meet various test needs

Standard air velocity prevents water vapor from condensing on top of test dishes, ensuring a constant humidity difference between the inside and outside of the test dishes

Convenient fast-access calibration ports for temperature and humidity calibration.

7-inch color HD LCD touchscreen can set the temperature and humidity of the chamber and displays value changes in real time.

The entire testing process automatically records and displays temperature and humidity data.

Built-in temperature and humidity sensors detect value changes. Simultaneously, the instrument incorporates PID temperature and humidity control algorithms to precisely regulate the temperature and humidity of the chamber in real-time.

For mechanical structure, the test chamber adopts a non-metallic structure with a thickened and reinforced copper exterior. It also features an insulation layer and a large heat dissipation area, resulting in minimal temperature differences between different parts and allowing condensation to form within the surface test space. Furthermore, water is used as the medium around the inner chamber; due to water's high specific heat, the temperature control range is relatively ideal.

A stable flow of air is provided by an air source.

Test Principle

Humidity Control Principle: A dry-wet gas mixing method is employed. As the name suggests, gases from two dry and wet gas paths are mixed in a specific ratio to obtain gas with the set humidity level. This mixture is then introduced into the test chamber, allowing the chamber to quickly reach the set humidity level. This process requires receiving feedback from sensors and using an algorithm to calculate the mixed gas ratio.

Dry Gas Principle: External air is first introduced into a dryer for dehumidification, achieving near 100% humidity.

Wet Gas Principle: External air is introduced into a humidifier, achieving 100% humidity. Humidity control utilizes mist-free humidification, operating on the same principle as a mist-free humidifier.

Gas Temperature Control: Because the saturated vapor pressure of water vapor varies at different temperatures, the gas path is temperature-controlled to ensure a constant humidity level.

Temperature Control Principle: PID temperature control technology.

Basic application	Film	Plastic films, plastic composite films, paper-plastic composite films, coextruded films, aluminum coated films, aluminum foil composite films, glass fiber aluminum foil paper composite films and many other film materials
	Sheeting	PP, PVC and PVDC sheeting, metal foils, rubber pads and other sheeting materials
	Textiles and Non-woven	Textiles and non-woven fabrics such as diaper, sanitation products, etc.
	Paper and Paper Board	Aluminum coated paper for cigarette, paper aluminum plastic composite film and other paper and paper boards
Extended application	Inverted Cup Method	Mount film or sheeting in test dish, cover upper surface of specimen with distilled water, and make the lower side in certain humidity. Generate a constant humidity difference between two sides; water vapor permeates through specimen and measure weight changes in different time to obtain the water vapor transmission rate. NOTE: inverted cups are required
	Artificial Skin	Artificial skin has to meet standard requirements for water vapor transmission rate to ensure better breath performance. This instrument can be used to test water vapor permeability of artificial skin
	Cosmetic	Water vapor permeability of cosmetics
	Medical supplies and dressings	Water vapor permeability testing of medical supplies and dressings, such as medicated plasters, sterile wound dressings, facial masks, and scar patches.
	LCD Display	Water vapor transmission rate of LCD display and its relevant sheet
	Solar Back-sheets	Water vapor transmission rate of solar Back-sheets and its relevant sheet
	Paint Film	All types of paint films
	Biodegradable Films	Test water vapor permeability of various sorts of biodegradable films, e.g. starch-based packaging films

Specifications	WVTR-01B
Temperature Range	15°C～50°C (Standard)
Temperature Accuracy	±0.5℃ (Standard)
Humidity Range	8%RH～55%RH
Humidity Accuracy	±1%RH
Air Velocity	0.5~2.5 m/s Using circulating air to prevent water molecules from condensing above the test cup.
External Structure	Three layers, supported by square mesh.
Gas Supply	Air
Gas Supply Pressure	0.6 MPa
Port Size	Φ6 mm PU tubing
Power Supply	220VAC 50Hz / 120VAC 60Hz
Instrument Dimension	600mm (L) × 600mm (W) ×800 mm (H)
Net Weight	49Kg