magnetic stirrers MCS66/MCS67 - FineMech

10.2 The PID menuThe following settings could be used to adapt (tune) the system to an optimum heatingperformance.volume in mlthermal resistanceThis value reflects the heat capacity of the liquid in thevessel. An increase of this value will result in a faster heat uptime. If a too high value is entered (much higher than the realexisting amount of liquid) this can result in an overshoot andoscillation of the liquid temperature. A too low setting of thisvalue will result in a very slow reaction of the system and alonger than necessary heat up time(default) factory setting: 400 mlThis value reflects the degradation of energy from the liquidto ambient temperature. This means that if there is a lot ofenergy needed (which comes from the hotplate) to hold thedesired liquid (probe) temperature, there is a low thermalresistance presentIf, for example water should be heated to 99°C at normalambient conditions, this would need much more than onlydouble the energy to heat water to 50°C.The standard setting of this value, when operating not tooclose to the boiling point of the liquid is approx. : 380If, however, a temperature close to the boiling temperatureshould be controlled, this value should be decreased to lowervalues to achieve a faster heat up time. To control water at98°C a value of 75 for the thermal resistance gives goodresults.Attention: The value of the thermal resistance should only bereadjusted from 380 (default) when operating close to theboiling point of the liquid, otherwise an extreme temperatureovershoot can occur !version 1.04 page: 19