New Friemann & Wolf M52EX intrinsically safe C-size cell for potentially explosive atmospheres

Büdingen, November 9th, 2011

Friemann & Wolf has extended its range of intrinsically safe cells developed for use in potentially explosive atmospheres with the launch of its new C-size M52EX cell. The M52EX cell is ideally suited for applications requiring safe, reliable high-power performance such as smart gas meters with built-in GPRS communications as well as a wide variety of other uses including gas tank level monitoring, leak detection and general usage in petrochemical and mining facilities.

The launch of the new M52EX lithium manganese dioxide (LiMnO2) C-size cell follows the success of Friemann & Wolf´s M20EX D-size cell, introduced in 2010. In addition to offering a unique, world-leading level of high performance for intrinsically safe cells, the two cells are currently the world´s only high power lithium cells to be rated T4 at +70°C.

In common with the Friemann & Wolf M20EX, the M52EX cell has been designed in compliance with the IEC 60079-11 standard (Explosive atmospheres – Part 11: equipment protection by intrinsic safety „i“). The new C-size cell provides a nominal capacity of 5.1 Ah (at +20°C, under a 200mA discharge) and a pulse capability up to 4 A. It also offers the benefits of a very low self-discharge rate – less than 1% per year of storage at +20°C – and the capability to operate over a wide temperature range (-40°C to +70°C).

The M52EX cell is based on a spiral electrode construction for high pulse applications and has an industrial design housed in a stainless steel container, with glass to metal seal, laser welding and safety vent for long shelf life. It ensures a high level of resistance to corrosion and safety under abusive conditions.