078/080/087 Series 240° scale

The Crompton 078/080/087 Series of heavy duty sealed instruments are designed to comply with the most stringent industrial, marine and military specifications. This metal cased range operates efficiently in the most adverse environments where extreme conditions of shock, vibration, dirt, humidity and temperature variation are present. Series 080-240° sealed complies with Ministry of Defence specification DEF STAN 66.7.

Metal cases with bezel sizes of 57 x 57mm (083), 83mm Ø (084) and 110mm x 110mm (078/087) fitted with toughened glass windows, are used throughout the series in standard matt black finish, which can be replaced with the optional light admiralty grey to BS3181C No:697. In order to avoid fogging they are dried, evacuated and filled with dry nitrogen.
The sealing provided is such that with the interior of the case maintained at a constant pressure of at least 94kPa above the exterior, the leakage does not exceed the equivalent of 1.33 Pa ml/s of air. Except on model 083, panel sealing gaskets are provided as standard. Standard instrument dials are finished in acrylic matt white with black printing and a parallel pointer. The scales form a true arc with zero on the left hand-side.  Options available include a centre zero, offset zero or suppressed zero, colour index lines, bands, zones or segments, black dial with white printing, and customers logo.

080 Series 90° scale

A range of metal cased, sealed instruments for use in industrial and military applications involving extreme shock, vibration, temperature, dirt or humidity.
Sizes 081, 082, 083 and 084 comply with Ministry of Defence specification DEF STAN 66-7 or DEF STAN 66-9 for all ratings listed in the standard. Size 089 complies with MIL-M-10304 dimensionally.

Five bezel sizes of 32mm Ø (081), 45mm Ø (082), 57 x 57mm (083), 83mm Ø (084) and 89mm Ø (089). Barrel diameters of 26mm (081), 37mm (082), 53mm (083), and 67mm (084 and 089). Toughened glass windows are used throughout the series. In order to avoid fogging they are dried, evacuated and filled with dry nitrogen.
Except on model 083, panel sealing gaskets are provided as standard.
The smaller cases, Models 081 and 082, are made from nickel-plated brass and anodised aluminium alloy. Single hole fixing is made by means of a threaded clamp ring which screws onto the barrel, they also have
ceramic insulated terminals and no zero adjuster is fitted. Models 083, 084 and 089 have steel cases with fixing holes in the flange.

Sealed zero adjusters are provided.
Standard instrument dials are finished in matt white with black printing and parallel pointer. The scales form a true arc with zero on the left.