The Bowthorpe EMP SC12 is a Surge Counter, whereas the SC13 also measures the 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 breakdown 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 with corrosion and water ingress resistance. 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.
A galvanised steel M12 bolt is included for installation; an integral lug at the back of the outer case provides the necessary clearance hole for the bolt insertion.
There is no maintenance; clean 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.
Shipping: Dimensions packed: 26 x 29 x 17 cm, weight 3.6Kg. Customs tariff code: 9030338090.
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