Humboldt H-3185B CONTROLLER User Manual
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© 2008 Humboldt Manufacturing
1.0 Introduction
The H-3185B controller (Figure 1) uses on-off control of heating and cooling devices to
cycle between two temperatures. It can be set to cycle between two temperatures for a
finite number of cycles and then stop. When set to run for a finite number of cycles,
ramp rate between temperature extremes can be adjusted as well as soak duration at each
temperature extreme. The controller is programmed to cycle from 40°F to 0°F when set
to run in cycle mode. The controller is designed to be wall mounted near the
Freeze/Thaw machine and runs on 125VAC power. The controller also utilizes a
temperature chart recorder with circular chart paper for tracking and documenting the test
cycles. A J type thermocouple is also supplied with the controller.
Figure 1
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