henward Posted May 19, 2011 Report Share Posted May 19, 2011 my 2x 1200Litre has 4x 300w jagers. last year, it heated to 28 no problems. i hae a feeling that they have been uncalirated. in time i know heaters do that, well i found them to do that. how do i calibrate jager heaters? i dont wanna just keep pushing temp up on the heaters and adjust manually like that. or should i? if someone knows details instructions of calibrating - best method, need help! Quote Link to comment Share on other sites More sharing options...
David R Posted May 19, 2011 Report Share Posted May 19, 2011 You'd want something more accurate than a 45 thermometer to calibrate it with I reckon, I'd be more inclined to trust the thermostat in the heater than the cheapo thermometer. Maybe get a digital one from Dick Smith? By calibrating it all you're doing is making the numbers on the dial correspond with what the temp is, so I wouldn't worry, just adjust it so the tank temp is right. Quote Link to comment Share on other sites More sharing options...
henward Posted May 19, 2011 Author Report Share Posted May 19, 2011 yeah may try that then. need to bring temp up back to 28 Quote Link to comment Share on other sites More sharing options...
David R Posted May 19, 2011 Report Share Posted May 19, 2011 Has the temp dropped? Quote Link to comment Share on other sites More sharing options...
alanmin4304 Posted May 19, 2011 Report Share Posted May 19, 2011 As stated, there is not much point in trying to calibrate if you don't have an accurate thermometer. I invested years ago in a very accurate digital one from Homershams (accurate to 0.1 deg C) If they are the old jeager type with a button on the top you place them in water of a known temperature until the whole thing is the same temperature as the water of known temperature. You then pull the button up and turn the dial to match the known temperature. Push the button down and it is calibrated. Quote Link to comment Share on other sites More sharing options...
henward Posted May 19, 2011 Author Report Share Posted May 19, 2011 yeah, temp is dropping, use to keep it at 28 no problem not its about 26 to 27 during the days. i really want the temp to be 28. i find that is better for my set up. i may re measure water and just move each individual heater up a notch problem is that i dont nkow which heater needs more moving up the temp, i may move one and the other may not needi t. thats why i was thinkingo f calibrating all of it. Quote Link to comment Share on other sites More sharing options...
David R Posted May 19, 2011 Report Share Posted May 19, 2011 I'd get another thermometer before calibrating anything. I don't know if heaters lose their efficiency over the years, can't see how they would. Maybe the thermostat is less accurate and its allowing the temp to drop more before switching it on? Quote Link to comment Share on other sites More sharing options...
henward Posted May 20, 2011 Author Report Share Posted May 20, 2011 yeah i found hat int he past too. it did slwoly lose accuracy. i think hats why they let you re calibrate it. ill et another thermometer. but i have all my thermometers saying the same thing even analogue ones. ill have a look, i may take one heater out and put it into a bucket of water and see what temp it brings it up to and calibrate from there. Quote Link to comment Share on other sites More sharing options...
David R Posted May 20, 2011 Report Share Posted May 20, 2011 you could use your smaller tank to test them, probably better than just a bucket of water. Put each individual heater in there one at a time with a couple of different thermometers and see which one holds it closest to the desired temp. Quote Link to comment Share on other sites More sharing options...
henward Posted May 20, 2011 Author Report Share Posted May 20, 2011 yeah good idea. will do that. Quote Link to comment Share on other sites More sharing options...
GZ_Loach Posted May 20, 2011 Report Share Posted May 20, 2011 The trouble with having two heaters in the tank is getting them to work at the same time, Sometimes you may find that they aren't set to the exact same temperature and you end up with one switching off and the other trying to heat the tank to X degrees. Quote Link to comment Share on other sites More sharing options...
henward Posted May 20, 2011 Author Report Share Posted May 20, 2011 thats right ih ave 4 of them. no choice. water volume dictates it. Quote Link to comment Share on other sites More sharing options...
GZ_Loach Posted May 20, 2011 Report Share Posted May 20, 2011 Could you not use a seperate thermostat? hook all the heaters up to it so that they all turn on/off at the same time. I'm only using two 300w heaters on my big tank, the jagers are rated up to 1000L each Quote Link to comment Share on other sites More sharing options...
henward Posted May 20, 2011 Author Report Share Posted May 20, 2011 yeah but there is to be a maximum 10degrees difference with ambient temp vs desired water temp though my garage is insulated, its still cold, it snot in the house. tahts my problem. i think my problem is also that i have 2x 1200litres in one system. when i get rid of my other 1200litre fromt he sysetm, the temp will be pefect and easily managed Quote Link to comment Share on other sites More sharing options...
GZ_Loach Posted May 21, 2011 Report Share Posted May 21, 2011 Yea you should be fine if you split the two tanks, my tanks 1100L and its sitting at 24 degrees with one Eheim heater (was stone cold when i filled it up 2 days ago) Quote Link to comment Share on other sites More sharing options...
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