Brookfield Bath, Model TC-101 - Manual (Page 12)

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Press If pump speed does not require adjustment,
press for FLUID VOLUME, Press again for FLOW RATE,
Press a third time for SPECIFIC HEAT
— Fluid Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
then once.
Enter the total internal and external fluid volume in liters. Default setting is 10 liters.
— Flow Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
then twice.
Enter an estimate of the fluid’s flow rate. (Not pump speed) See chart in Section 2.5 for
flow rates. If using a viscous fluid, enter half the rated flow rate.
Note: This setting does not change the speed of the pump motor.
If you are using the external inlet outlet connections, you can measure or estimate the
flow through the external pipes and enter this in liters per minute. Default setting is
10 liters per minute.
— Specific Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
then three times.
Enter the specific heat capacity of the bath fluid used. See Section 2.3. for fluid specific
heats. Density of a fluid usually does not vary as much as the specific heat. In cases
where the density in grams per cubic centimeter is significantly more or less than one,
multiply the density by the specific heat to obtain a closer figure.
If Control Is Too Slow Or Unstable
Unusually low pump flow rates with viscous fluids, small fluid volumes or low specific
heat can cause temperature control instability. The tuning parameters adjust the PID
tuning constants to permit control to ±0.01°C even under unusual conditions. Settings
are not critical, estimates are acceptable.
Applications using large, poorly insulated external chambers may experience poor
temperature stability due to excessive temperature gradients.
If external circulation is not required, the circulation and temperature uniformity in the
internal bath may be improved by attaching tubing from the inlet connection to the
outlet connection of the circulator.
Application Notes In Tuning
CONTROL PUMP FLUID FLOW SPECIFIC EXTERNAL
SYMPTOM SPEED VOLUME RATE HEAT PROBE
SETTING SETTING SETTING SETTING MSD*
Too Slow Raise Raise Raise Raise Lower
Unstable Raise Lower Lower Lower Raise
Won’t Reach Raise Raise Raise Raise Raise or
Setpoint Lower
* Only needed when using the external probe. See section 3.2, FCN 4 for setting the Maximum
Setpoint Differential.
SPECIFIC HEAT
1.00 (.25 TO 1,00)
FLUID VOLUME
10 LITER(S)
FLOW RATE
10 LITER(S) / MIN