I'm preparing experiments on newly settled coral larvae and trying to setup a water-bath system in which I maintain the temperature of the internal 5 gallon tank at 32.0°C +-0.1°. My temperature probe is in the internal tank which has incoming turnover water of 27-29°C depending on the time of day. I have a 300watt heater in the 10 gallon water bath surrounding the internal tank. I currently have the following programming:
Fallback OFF
If Temp < 31.7 then ON
If Temp > 31.8 then OFF
Unfortunately, when the heater turns off it overshoots my desired temperature (32.0°C) by ~ 0.7°, resulting in a range of 31.6°-32.7°, which is unacceptable for the experiments I need to run. When I look at the output log, the heater turns on for approximately 12 minutes.
How do I program the heater to turn on for only 6 minutes, or a specified amount of time so as to not overshoot my desired temperature in the internal tank? Or can someone suggest another way to program to achieve 32.0° with as little differential as possible?
Any help would be greatly appreciated.
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