thermistors

[bob the plumber]

when checking ch/dhw thermistors on a boiler breakdown what do you lads use to take the tempreture of the pipe work. went on a worcester breakdown course recently and the engineer/trainer there had a multimeter looking device with a piece of cable coming out from it that wrapped round the pipe work? anyone know what they are and who makes them?

cheers bob

 

[SimonJohns]

They are called strap on thermocouple. Does your multimeter have a thermocouple connection?

 

[bob the plumber]

cheers si, my multimeter hasnt, you couldnt pass me onto to a page and show me one that has?

cheers

bob

 

[M.Joshi]

Some of the Fluke multi-meters have a thermocouple connection and function on them. Alternatively, you can buy a dual-channel thermometer with thermocouples for <£20 on Ebay etc. It looks a bit like a multi-meter. K-type thermocouple probes are the most common.

 

[SimonJohns]

Have a look at this
http://www.jmtest.com/pages/productdetail.asp?ID=3167

There's a strap on in that kit

 

[dancinplumba]

do you have an fga ? this may have K type thermocouple connector.
you can buy clip on or wrap around ones with this type of connector an plug into fga ?
imo

 

[diamondgas]

I have come across a few other sites with strap ons but I doubt they're of any use .... They look like they're could be used for taking temperatures but I wouldn't fancy it :rofl:

I have a cupl for my fga ... joking aside

 

[bob the plumber]

thanks simon, just looked at the price on ebay 160 quid i know what im looking for now thought so thanks all

 

[M.Joshi]

How about a dedicated instrument - something like this:

http://www.ebay.co.uk/itm/Dual-Two-...ermocouple-Sensor-1300-C-2372-F-/270887344801

It will show you both readings from each thermocouple on the screen or the temperature differential between the two as well as Max, Min & Average. I'm thinking of buying one so that I can easily balance our radiators - the differential setting will be useful for this.

You can tape the thermocouples to pipes with electrical tape.

 

[SimonJohns]

How about a dedicated instrument - something like this:

Dual Two Channel 2 K-Type Digital Thermometer Thermocouple Sensor 1300°C 2372°F | eBay

It will show you both readings from each thermocouple on the screen or the temperature differential between the two as well as Max, Min & Average. I'm thinking of buying one so that I can easily balance our radiators - the differential setting will be useful for this.

Your really over thinking balancing.

Real plumbers use their hands

 

[M.Joshi]

Your really over thinking balancing.

Real plumbers use their hands

I'm not a real plumber and don't have years of experience to do this! :wink_smile:

 

[bob the plumber]

do you have an fga ? this may have K type thermocouple connector.
you can buy clip on or wrap around ones with this type of connector an plug into fga ?
imo

i dont but the boss does, he has an anton v2 and i know what you mean, it would probably take one

 

[Roger Welton]

The v2 has 2 thermistor inputs

 

[dancinplumba]

1 instrument 1 calibration fee, thnik telegan has dual input ? old sprint 2000 does
think it does ?

 

[diamondgas]

when checking ch/dhw thermistors on a boiler breakdown what do you lads use to take the tempreture of the pipe work. cheers bob

In answer to your question I have rarely if ever checked the temp against thermistor resistance readings. Usually found the readings to be way out of the mi's recommendations when faulty! I use to have a multimeter type thermocouple probe that was surface touch temp sensitive, broke it! have also considered getting an infra-red temp reader. can't justify the cost. Ended up buying a cheapy off the internet but found it unreliable!! So carry a few sensors as stock as they're cheap and usually easy to swap for testing purposes