The Bowthorpe EMP SC12 is a Surge Counter only, whereas the SC13 also measures total leakage current shown by a dial display. Both have been tested widely with a variety of Surge arresters. The integrated counter logs spikes or surges.
Analogue instruments with SC13 monitoring current through the arrester and the leakage current over the surface of the arrester housing. Changes post-installation may point to a break down in the arrester or an accumulation of surface contamination.
Commissioning is easy, as an auxiliary supply is not required. Installation is via the earth connections of a surge arrester or can be installed with the common earth of a three-phase set.
Enclosed in a one-piece die-cast aluminium housing, allowing suitability for indoor or outdoor deployment. Corrosion and water ingress resistant. The glass viewing window is sealed to the unit using silicon rubber adhesive, an inbuilt desiccator counters any moisture that may have penetrated during sealing.
For installation a galvanised steel M12 bolt is included, an integral lug at the back of the outer case provides the necessary clearance hole for the bolt insertion.
There is no maintenance, all that is required is cleaning the front glass viewing window periodically to view the count and leakage (SC13 only). It is recommended the e moulded epoxy resin line terminal bushing is kept clean.
The surge counters can be supplied with an auxiliary contact rated 0.5 amps 250V for connection to remote signalling equipment if required put suffix AC: SC12/AC or SC13/AC.
Dimensions packed: 26 x 29 x 17 cm. Weight 3.6Kgs.
SC12 Counter only
SC13: Counter & Leakage. Meter scale : 0 – 30 mA (bilinear scale)
SC13L: Counter & Leakage. Meter scale: 0 – 50 mA (bilinear scale) – currently not manufactured