Calibration; Options; Sample Probe - LabRepCo GM-ULT-1786 Owner's Manual

2. Empty the freezer of contents and transfer them to another freezer. Leave the inner
doors open.
3. Place moisture absorbing material such as paper or cotton towels in the bottom of the
freezer and on the floor in front of the freezer.
4. Allow frost to melt and loosen. The lose frost can be removed carefully in order to move
the process along more rapidly.
5. Once the freezer is free of frost, use a mild non-chloride cleaning agent, rinsing with
water.
6. Close doors and restore power.
7. Depending upon your temperature set point, storage temperature should be fully
restored in 8 to 12 hours.

Calibration

This procedure allows the temperature readout on the control panel to be adjusted to match
your temperature standard. The calibration allows for a +/-5°C adjustment to "offset" only.
There is no adjustment for "slope" or "span" available through the control panel.
1. Install reference temperature probe next to the control probe located on the interior of the
freezer. The reference probe should be calibrated and traceable to a known standard such as
NIST. The reference probe has to be installed through the access panel on the rear of the unit.
This is best accomplished when the freezer is at room temperature.
2. Turn the freezer on and allow the unit to pull down and cycle at the desired set point, or use
the default set point of -80 C.
3. Navigate to the calibration mode through the control panel, and access the calibration menu.
Scroll through the menu until "Control Probe" is reached. Press Enter to access the menu for
control probe calibration.
4. Using the Up/Down Arrows, adjust the temperature displayed next to "Control Probe" to
match the temperature readout from the reference temperature probe. The temperature is
displayed in tenths of a degree. Then Press Enter to accept the calibration for the control probe.
Note1: The large temperature display may change value when you press Enter, depending on
how much calibration is required.
Note2: The maximum calibration on the temperature probes is +/- 5 C. If further calibration is
required, contact the technical service department for assistance.

Options

Sample probe

There is access to a probe port at the rear of the freezer. It is uncovered when the access plate,
held in place with 6 Phillips head screws, is removed.
Part number 21729, Rev 4
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