SEIWA ELECTRIC MFG. CO.,LTD.

This equipment performs "flame-propagating tests" to check the ability of a flameproof enclosure to prevent the flame caused by internal explosion from propagating to outside explosive gas, and "explosion-pressure tests" to check its ability to withstand the internal explosion pressure. The vapour-tight tank which withstands an internal pressure of 30kg/㎠ and the remote controller are the main components of this equipment. Vacuum pump, air compressor, gas mixing chamber and other apparatus are also provided.

This equipment tests a dust ignition-proof electric apparatus to check its dust-proofness and temperature rise. The sample apparatus is placed in the equipment where 200-mesh dust is continuously supplied at a rate of 2kg/㎥ to reduce the apparatus internal pressure to approx. 200mmH2O. Its temperature rise with dust accumulation on it is checked.

In order to determine safety of explosion-protected electric apparatus against ignition of explosive gases, this equipment measures temperature of apparatus in the constant temperature room. Room temperature is determined and temperature rise is recorded by the controller outside. Overvoltage conditions and electric characteristics at high temperatures are also tested.

This equipment tests the mechanical strength of a lamp cover by dropping a steel ball of a specified weight on the weakest surface of the cover from a specified height.

Electric apparatus for outdoor use should be of rain-proof and droop-proof construction. This equipment is used to check for water leaks into the apparatus.

This equipment checks the rigidity of contacts of components by giving vibration to the apparatus.

Light distribution is measured by our automatic light distribution measurement equipment in the following way : the light reflected from the mirror is caught by the detector, and indicated on the digital graduator automatically.