CTL29 - Protective Clothing Surface Resistivity Test Apparatus
For measurement of surface and volume resistivity on protective clothing and other surfaces.
- Simple to use
- Small and compact test equipment
- Permits measurements to determine protective clothing surface and volume resistivity to BS EN1149
- Tera-Ohmmeter with built in 100 V power supply
- Auto ranging measurement function
- Custom test cell to BS EN1149
Designers of protective clothing, or any other man made material for that matter, need to know the resistivity properties of their product. For instance, depending on the nature of the target industry, the garment’s intended use may well be in a static sensitive area (such as a clean room or electronics workbench) where any charge build-up could damage electronic components. Alternatively, ignition of sensitive gases, vapours or even powders as a result of static electricity could be hazardous to personnel and result in damage to plant and equipment. Even in the retail industry, designers may need to know resistive properties of materials, since static can lead to self-clinging of fabrics, which not only causes discomfort for the wearer but also attracts dust and dirt to the garment reducing its lifetime and potentially causing an unsightly appearance.
Functional Specification & Deliverables
- Terra Ohmeter spec
- BS EN1149 Protective Clothing Surface (volume resistivity test cell)
Other test cells can also be manufactured for testing other material types and to meet various applications:
- Ohm square test cell for basic resistivity measurements of solid materials. Can be adjusted for slightly non-uniform / irregular surfaces. (Cell constant is 1)
- Concentric ring electrode – testing in accordance with BS6524 (for measurement of surface resistivity of textile fabrics)
- Testing to BS6233 (now superceded by BS62631 for measurement of volume and surface resistivity of solid insulating materials)
- Testing to DIN 54 345 pt 5– Determination of electrical resistance of textile fabrics
The following is available at extra cost:
- Charge decay time analysis equipment – JCI 155v6 with sample support base
- JCI 191C Automated Humidity Controlled Cabinet.
Note: Where a textile fabric, garment or other material contains conductive yarns it is very important to properly understand their possible effects on resistivity measurements, which often depends on the type of resistivity cell used, or even its orientation. In these cases it is helpful, or even essential, to support the resistivity measurement with a charge decay time and capacitance loading measurement. Chilworth Technology Ltd manufactures a charge decay time analyser (JCI 155v6) which includes measurement of capacitance loading.