sensor tube

[jay]

my next 2 jobs are ufh ,warmup from topps, any ideas what i can safely use as a tube

plastic or metal, and where did u get yours? cheers steve

try to stick with plastic as some probes dont like metal

 

[Mike]

i laid a warm up system (from topps) just before xmas which had the sensor tubing with it, a black flexi tube around 12mm gauge. it may have been old stock tho as the thermostat was the old type.

 

[doug boardley]

I don't use the tubing as it's almost impossible to pass a new sensor down it to the end. I do however install a spare sensor with every mat I supply and fit.

I thread it in Stewart then tape the end to the tubing where it connects to thermostat.

 

[Gazzer]

I thread it in Stewart then tape the end to the tubing where it connects to thermostat.

have you been watching me ?

 

[doddy41]

Always use warm up not cheap alternatives and you wont have a problem you would never be able to push a new sensor down a tube

 

[Gazzer]

Always use warm up not cheap alternatives and you wont have a problem you would never be able to push a new sensor down a tube

I can and have done.

 

[poynton phil]

I don't use the tubing as it's almost impossible to pass a new sensor down it to the end. I do however install a spare sensor with every mat I supply and fit.

Exactly the same as that, i just cant see you being able to push a sensor that far down a tube, without it trapping.

 

[Gazzer]

2 tips. Stretch the tubing as this will smooth the tube out a little making it easier to feed the cable down. Also my sparky always fits the spur at a low level in line with other such sockets. the tube only goes from the low level socket then under the floor. You can easily push the probe through. The rest of the cable goes up to thermostat.

 

[micko]

I know this is a little old but I used a bit of 15mm copper with a slow bend in it.

 

[Qwerty]

I know this is a little old but I used a bit of 15mm copper with a slow bend in it.

This may misread the temperature as metal will conduct and retain the heat

 

[micko]

I would disagree the copper pipe can only reflect the temperature of the floor, no hotter, no colder if anything it would react faster than plastic. Plastic may dampen the temperature change but I can see no advantage. You may have problems if the end of the copper is touching the UFH cable but that is bat installation.
However I may be wrong this is just an opinion, I have only ever installed 4 systems one In screed and never had problems.
I did have to change one probe and this came out of the tube easily.

I am away for a few weeks so won’t be able to discuss this further until I get back.

 

[Scott]

Wont the copper affect the electric field of the cable though? Copper cable copper pipe?

 

[Uheat - Keith]

In our approx. 8 years in the UK, we have never said to use a copper pipe for the floor sensor, as this could give a false reading.
In all our Mat and Cable boxes we have a pair of 12mm Flexible plastic conduits, one of which has a bung. Insulation tape could also be used, stopping the compound getting into the tube.

As Others above, a low level service box with blank plate or the switched fused spur are the best options to feed from. These are like a half way house between the controller at one end & the end of the tubing at the other end. From Wall to Floor the conduit is best installed with a smooth bend in it, not a sharp right angle.

 

[micko]

In our approx. 8 years in the UK, we have never said to use a copper pipe for the floor sensor, as this could give a false reading.
In all our Mat and Cable boxes we have a pair of 12mm Flexible plastic conduits, one of which has a bung. Insulation tape could also be used, stopping the compound getting into the tube.

As Others above, a low level service box with blank plate or the switched fused spur are the best options to feed from. These are like a half way house between the controller at one end & the end of the tubing at the other end. From Wall to Floor the conduit is best installed with a smooth bend in it, not a sharp right angle.

I am interested to know why copper will give a false reading, on what do you base this?

 

[CJ]

All the warm-up kits I have use have had tubing with them. As long as you keep the tubing in a straight run.............the probe slides in, no problem. Just tape end up to stop addy clogging the end and sticking the probe.

Sorry.............old-ish post