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General Operation
8.7 Fluid Drain 8
8-9
8.7 Fluid Drain
The fluid may be drained from the 7102 by tightly screwing the transport/pour
access lid onto the top of the bath and pouring the liquid into an appropriate
container.
8.8 Temperature Controller
The bath temperature is controlled by Hart Scientific’s unique hybrid
digital/analog temperature controller. The controller offers the tight control
stability of an analog temperature controller as well as the flexibility and
programmability of a digital controller.
The bath temperature is monitored with a platinum resistance sensor in the
control probe. The signal is electronically compared with the programmable
reference signal, amplified, and then fed to a pulse-width modulator circuit which
controls the amount of power applied to the bath heater.
The bath is operable within the temperature range given in the specifications. For
protection against solid-state relay failure or other circuit failure, a bi-metallic cut-
out automatically turns off the heater anytime the bath temperature exceeds the
maximum temperature.
The controller allows the operator to set the bath temperature with high
resolution, adjust the proportional band, monitor the heater output power, and
program the controller configuration and calibration parameters. The controller
may be operated in temperature units of degrees Celsius or Fahrenheit. The
controller is operated and programmed from the front control panel using the four
key switches and digital LED display. The controller is equipped with a serial RS-
232 digital interface for remote operation. Operation using the digital interfaces is
discussed in Section 10.
When the controller is set to a new set-point the bath heats or cools to the new
temperature. Once the new temperature is reached the bath usually takes 15 –
20 minutes for the temperature to settle and stabilize. There may be a small
overshoot or undershoot.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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