The window of prismatic EN 543.3 fluid level sight glasses is embedded in the body during the injection process and it is therefore absolutely leaktight.
Prismatic fluid level sight glasses use the so called prismatic effect of a cat’s eye to give a clear and unmistakable fluid level reading irrespective of oil colour or viscosity. The advantage of these effects becomes obvious in case of a total underfilling or overfilling and monitoring the situation under unfavourable conditions.
The seal is embedded in a radial undercut and it cannot be extruded during the tightening operation.
EN 543.3 fluid level sight glasses can also be used on pressurized tanks. Tests regarding maximum pressure are available.
For mounting on walls of less than 4 mm thickness please use a GN 7430 mounting nut.