David Martin Hershey on fri 12 nov 10
After I started experiencing relay failure,
I intuitively added a small fan pointed at
the vents on my attached controller box
to see if keeping the controls cooler
would help extend their life.
I've had relays fail in both the open and
closed position. They look black & burnt
through the plastic housing.
This may be somewhat normal because
of the arcing when the relay opens & closes?
My newest Skutt relays are in metal housings now.
Are any of your crystalline group using
mercury relays? If so, how are they holding up?
My guess is that to keep costs down,
kiln manufacturers are using relays that
are not really engineered for long term
serious "normal" use in an electric kiln.
Perhaps Arnold can enlighten us on that subject.
David Martin Hershey
DMH Studio + Design
2629 Manhattan Ave #137
Hermosa Beach CA USA
On 11/12/2010 5:56 AM, William & Susan Schran User wrote:
> On a crystalline glaze forum there has been lots of discussion about
Arnold Howard on mon 15 nov 10
From: "David Martin Hershey"
> Are any of your crystalline group using
> mercury relays? If so, how are they holding up?
> My guess is that to keep costs down,
> kiln manufacturers are using relays that
> are not really engineered for long term
> serious "normal" use in an electric kiln.
The standard mechanical relay used in most kiln brands is
the 30 amp P&B. Much better than the mechanical relay is the
mercury type, which is optional on most Paragon kilns and
standard on the Paragon Dragons and Vikings.
Glass fusing kilns are far harder on relays than are the
ceramic kilns. This is because thick glass requires very
long annealing times (slow cooling). In some cases, a kiln
will anneal the glass for several days. Mercury relays have
performed well in that environment.
Paragon Industries, L.P., Mesquite, Texas USA
email@example.com / www.paragonweb.com