Temp Probe

I need a Temperature probe that can activate a relay switch, doesn't need temp. adjustment can be set once, to 25° C

Thanks in advanced.

 

There is a bunch in Strydom park called Temperature controls. They have a range of things that will do the trick.

 

Have a google for Habistat controllers - see if that is any good

 

Found a unit cost R1,500.00

What do you guys think ?

here is the specs:

RKC – MICROPROCESSOR BASED DIGITAL TEMPERATURE CONTROLLER, WITH DUAL DIGITAL DISPLAY, SINGLE ALARM AND DIRECT ACTION.
DIN SIZE : 48 X 48 MM
INPUT : PT100
OUTPUT : RELAY CONTACT
ALARMS : SINGLE
TEMP. RANGE : -199.9 TO 649°C
SUPPLY : 85 – 264 AC



MINERAL INSULATED 3-WIRE SIMPLEX PT100 RESISTANCE TEMPERATURE DETECTOR, COMPLETE WITH
2 METER TEFLON INSULATED TAILS AND ½” NPT BRASS ADJUSTABLE COMPRESSION FITTING.
PART NO. : LR22-50FM(100)C-2000T-4F4B
SHEATH LENGTH : 50 MM
SHEATH DIAMETER : 6 MM
SHEATH MATERIAL : 316 STAINLESS STEEL

 

You can adjust in 0.5 degree increments.

 

Check out the units I described in this thread. If you're interested I can get it for you

Not sure of the latest price, but my unit, with 2 controller relays, alarm output, AND RS485 computer communication capability and a hastaloy covered probe was about the same price as your quote - a lesser spec unit would be a few hundred rand cheaper...

Hennie

 

My controllers I build go for around R1500, and have allot of other features as well, like controlling your lights, top-up, logging the temp on your pc etc. etc....

 

Hi Warr - cool! I think that Hennie uses something similar to this...

 

hennie

i would be interested

thanks

 

price of control unit

unit to control temp,comp linkable, fan, etc costs 898 plus it aint put together, in the long run it will cost more for all add ons, go with the complete unit

 

Warr what is your plan for the controller? What are you planning to control?I`m always looking for new ideas to improve my setup.

 

Yes, a very interesting and useful controller, if I remember correctly... you had a thread on it - could you please post a link to it, so Warr7207 could look at it?

Hennie

 

Not sure if you're referring to "my" controllers, but in general:

• IMHO unless a person is *really* not able to use a screwdriver and wire stripper (or knife...) the "putting together" these units are quite easy, especially so if it's only one temperature controller.
• Why would one need "add ons" in the long run? If the need is to only have a temperature controller, then the one unit will be a temperature controller... If' however, the need later change to also wanting a pH controller (or meter), and/or other type of controller, it's very easy to expand, and one only pays for that which one needs at that point in time. My 3 controllers have been running faultlessly for some 7+ months, and I'm currently considering the addition of a conductivity controller to measure & control the tank's salinity as well.

Hennie

 

I just want to control my sump fans, rather than them running 24/7. Doing my bit for Eskom

 

I connect mine to the timer for the lights, so when the lights come on so do the fans.

 

i hear what you say and it makes sense to me

 

Thats a good idea Alfie but I think much more energy efficient for them to come on only when needed. ie, when the temp starts to rise.

 

I only need the fans on for a short period of time (3hours) and mainly in Summer. The other reason I don't want the fans running long periods of time is the evaporation rate is increased hectically when the fans run.

 

only run mine in the hotter periods of summer, unplug otherwise