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SELENIUM PHOTOVOLTAIC CELLS Small Picture of Old Exhausted Weston Lightmeter Selenium Photovoltaic Cells removed from Weston Master Light Meters

WESTON METER SALES & REPAIR SERVICE: Weston Master IV, V, and Euro - Master - Available Now DECEMBER 2018

Picture of Weak Exhausted Weston Lightmeter Selenium Photovoltaic Cells removed from Weston Master Light Meters

Dead Weston Lightmeter Cells removed from defective Weston Master Light Meters.

Over time, the cell protective lacquer layer shrinks and reticulates (crazes) allowing the atmosphere to oxidise the selenium layer and destroy the electro-conductive properties of the cell. Water damage, damp, and overheating from the lightmeter being left in hot sunlight also cause cell failure.

The meter reading becomes inaccurate and the lightmeter is no longer effective. Fitting a new cell is the only solution

Cross-section Diagram of Selenium Cell:

Small diagram of Selenium photovoltaic Cell

The diagram shows an idealised barrier-layer selenium photocell in section. The steel support plate 'A' provides the rear (positive) contact, and carries a layer of metallic selenium 'B', which is a few hundredths of a millimeter in thickness. 'C' is a thin transparent electrically-conductive layer, applied by cathodic sputtering; it is reinforced along its edge by a sprayed on negative contact ring 'D' and protected from damage by lacquering. The rear support of photocells is protected from corrosion by a metallic spray coating 'E'; this also improves the electrical contact.

WESTON METER SALES & REPAIR SERVICE: Weston Master IV, V, and Euro - Master - DECEMBER 2018

 

Purchase a Weston Meter repair The mechanism is Guaranteed to be restored to original condition and cleaned and unclogged of ferrous dust and with a new selenium cell fitted.

Purchase a Weston Meter The meter mechanism is Guaranteed to be restored and cleaned and unclogged of ferrous dust and with a new selenium cell fitted. Tested in excellent working order.

enquire@ian-partridge.com 

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