Tridicators

SWEI

We all love to hate them, but the OEM ones still need replacing on certain boiler models. Who came up with the brilliant idea for a 320°F scale? Is there an option out there with scales of say 60 PSI and 240°F?

kevin_58

Continental instruments 0-60lbs 70- 250f

SWEI

Thanks. Looks like those are square gauges, but their round ones are not too far off http://www.cpigauges.com/part_numbers/tridicator-gauge.htm

rick in Alaska

I want one that only goes up to 50 psi, which is the max of most boilers. Very frustrating trying to set pressures on a gauge that goes up to 75 psi!
Rick

SWEI

Agreed, but code requires 2x the PRV rating. 60 PSI would meet that for the overwhelming majority of small boilers.

Abracadabra

SWEI said:

We all love to hate them, but the OEM ones still need replacing on certain boiler models. Who came up with the brilliant idea for a 320°F scale? Is there an option out there with scales of say 60 PSI and 240°F?

Well.. water boils at 300F at 60PSI so that's probably the reason for going to 320F max. At 75PSI it's 310F.

SWEI

Water boils at 250°F under 30 PSI. That's plenty of range to show a major problem. Anyone have a source for a round gauge with 60 PSI and 250°F scales?

Abracadabra

I just checked one of my supplier's catalogs. They carry a 2-1/2" round Marsh 0-60PSI 60-260F. Their catalog doesn't list all the specs in their catalog, but I found the two they carry on Marsh's website here:

http://www.marshbellofram.com/marsh/files/2012/07/Temperature2.pdf

Tridicators are on the last page.

SWEI

Thanks -- I had that doc from a few months back but had not checked it again. Looks like a Marsh Y22026 should be a good option for replacing those flush mounted OEM gauges.

bmwpowere36m3

Any opinions on Honeywell tridicators?

hot_rod

Gauge manufacturers will build pretty much anything you want. If you order some quantities. We work with Winters and they have put together some nice prototypes

I'd like a high quality, stainless case, liquid filled pressure/ temperature gauge. But would the market pay for such a quality gauge? That's why you see the lower quality stuff, not many, or enough, would pay for an expensive gauge.

SWEI

hot rod said:

Gauge manufacturers will build pretty much anything you want. If you order some quantities.

I noticed that. Not looking to go into manufacturing here, just looking for a decent replacement option that has at least some useful range to it. Trying to read ~12# of pressure on a 100 PSI scale with less than a 90 degree arc sucks.

icesailor

The Unusual States of America is the only country still using the length of the King's foot as its standard unit of measure. The rest of the world converted to the metric system years ago. Even our Amigo's to the North and South of us don't use the King's Foot any longer. The readings on Tridicator's are so that gauges installed on US boilers can be sold and meet requirements in other countries that don't have the same one as we do.

Don't complain too much. The way manufacturers are sensitive to criticisms that might affect their bottom line, they could start shipping boilers without Tridicator's.

Be careful what you wish for. You might get it.

Docfletcher

Here is an Ebay listing for New 50psi boiler gauge Temp is up to 280F

http://www.ebay.com/itm/BOILER-GAUGE-TOOL-50-PSI-TEMPERATURE-TEMP-260-F-1-2-NPT-MADE-USA-/331470221993?pt=LH_DefaultDomain_0&hash=item4d2d2a32a9