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Product Details
Application:
WVTR-398B is based on the humidity sensor detection method and available for the water vapor permeability test of heat exchange membranes, nonwoven fabrics and flexible barrier materials.
Features:
| features | Weighing method |
| Dual weighing modules, patent technology | |
| 18 specimens, continuously test | |
| One-button test, test automatically in whole process | |
| Multiple test modes optional | |
| Temperature and humidity auto control | |
| Data curves display | |
| Computer control | |
| Environment temperature and humidity sensor inside | |
| Unit based on embedded system,24bit Δ-Σ AD | |
| Traceable reference film calibration | |
| Supports DSM system (DSM, lab data management system) |
Principles：
The specimen is clamped between the upper and lower chamber, the upper chamber is high humidity side, and the other side of specimen, lower chamber is purged by a stream of dry gas, due to the effect of water concentration gradient at two sides of the specimen, water molecules will permeate through the specimen into the dry gas side, penetrated water molecules will be carried to the relative humidity sensor which generates the proportional signal, so water vapor transmission rate will be obtained by calculating the sensor signal.
Technical indexes:
| Test range | 5 - 6500 g/m2·24h (Standard) |
| Resolution | 0.001 g/m2·24h |
| Specimen amount | 1 specimen |
| Temperature range | 5C–95C |
| Temperature accuracy | ±0.1C |
| Humidity range | 100%RH (Standard) |
| Humidity accuracy | ±1%RH |
| Test area | 38 cm2 (Standard) |
| Specimen size | >=150mm * 94mm |
| Thickness | less 3mm |
| Carrier gas | Dry Air, or 99.999% Nitrogen |
| Carrier flow | 0~200 ml/min |
| Gas interface | 1/8inch |
| Power supply | AC 220V 50Hz |
| Dimension | 330mm(L) * 600mm(D) * 330mm(W) |
| Net weight | 30kg |
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