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OPERATING MANUAL
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ULT25NEU
|
10.05.22
2
Procedure
1
Place a thermocouple inside the cabinet via access port
1
and
insert plug/port sealant.
Note:
Display temperature is calibrated
using a NIST traceable thermocouple located in the center of the
cabinet (4.4” from back, 6.6” from left side, 6.7” from bottom).
2
Turn unit on.
3
Set temperature to -80ºC.
4
Wait until the display reads -80ºC. For best results wait an
additional hour to ensure uniform cabinet temperature.
5
Connect a NIST traceable temperature measuring device
2
to the thermocouple located inside the cabinet.
6
Slide open filter door located on the side of the cabinet
3
.
7
Using an extra-long screwdriver
4
locate the potentiometer
through filter opening
5
.
8
Turn the adjustment screw until the display temperature is the
same as the hand-held instrument.
¼ Turn = 3 DEGREES
.
9
Turn the screw to change the temperature indicated on the display
(clockwise for warmer and counter-clockwise for colder).
10
After making an adjustment,
WAIT 15 SECONDS
for the unit’s
indicated temperature to register the adjustment. Repeat adjustment
if necessary.
11
Calibration complete.
8.
CALIBRATION GUIDE
(Continued)