0 introduction – Humboldt H-3185B Rapid, Freeze Thaw Cabinet User Manual
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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.
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