Gossen Lunasix & Weincell

[David Lingham]

I have the chance to buy a Gossen Lunasix 3, and I thought of installing MRB625 Weincell batteries in it. Only I found this text on a UK battery suppliers website.

The use of the MRB625 WeinCells in the Gossen Lunasix 3 meter can be problematic because the central negative electrical contact of the battery chamber has sprung ‘arms’ which have a span that is greater than the diameter of the negative terminal of the WeinCell. This can result in the cell being short circuited!!!! The original PX625 negative terminal is 11mm whereas the WeinCell MRB625 is only 8mm. By placing a 13mm brass washer over the sprung arms this problem can be solved.
Therefore, for use in the Lunasix 3 Gossen meter (and ONLY the Lunasix 3 - other models are unaffected), the MRB625 WeinCell requires the addition of a 13mm conductive washer. The widely available M6 washer will do the trick.

Could anyone offer any advise please.

 

[Dan Fromm]

David, I use #675 hearing aid batteries, another way of spelling MRB625 Weincell without centering ring, in my LunaPro (= Lunasix 3). They're short-lived, ~ 1 month, otherwise problem free.

 

[colin wells]

I fitted a couple of diodes into mine and its the end of all battery problems There are plenty of how to's on the net and youtube then just fit two sr44

 

[David Lingham]

Thank you Dan and Colin.