paraffin wax deposition and fouling

against a standard thermometer, was fastened to the thermistor. The
—0 to 50 x 0.1°C mercury in glass thermometer, previously tested
controllers -
tanks were calibrated at the maximum sensitivity of the temperature
The thermistors placod in the experimental solution and cooling water
A52 Thermistors’
calibration values are plotted in figure k5.1.
water and experimental solution circulation systems, respectively. The
Tables A5.3 and show the calibration values for the cooling
were recorded as the calibration vaiues.
mercury in glass thermometer at that point and the controller setting,
reached where the light stopped Zmshing. The temperature shown by the
:as on. 3y gradually decreasing the controller setting, a point ‘as
-an. Th:s turne ;ae 1 neater on ana a lgnt :asaed, inccatzng i
the temperature controller WaS set above the actual tempera;ure in the
ture fell below the required value. In order to calibrate the thermistor,
In practice, the 1kW controfled heater was turned on if the tempera
for both the circulation systems.
recorded as the heating occurred. The same calibration method was used
system now gradually increased its temperature. Calibration values were
2kW heater and the circulation pump were turned on. The circulation
- A21 -