STEP 1
LAB OVEN SERIES
Calibra�on and Temperature Range Adjustement for Analog Lab Ovens
A calibration to the knob can be performed if the chamber temperature is off by 15 degrees Fahrenheit or more from the
temperature number printed on the dial on models 20,30,and 40 GC/AF.
A temperature range adjustment can be performed to the oven when not able to reach lower or higher temperatures when
set with the dial.
REMOVE COMPRESSION PIN
TO ACCESS TRIM-SCREW.
Understanding the Knob
For 10GC/AF model ovens, the numbers on the dial represent a
power setting of 1 through 10. For all other models, the numbers
represent a temperature in degrees °F (Fahrenheit) on the dial and °C
(Celsius) on the back panel. (Fig A)
The numbers printed on the unit’s dial are only to be used as a
reference and do not represent an actual temperature inside the
unit. Use the thermometer provided with the unit to obtain a true
temperature from inside the oven.
OFF
45
0
40
0
350
300
15
0
20
0
250
°C
0
9
8
7
6 5 4 3
2
1
Make sure the screw recessed in the shaft has moved after
adjustment.
Allow the temperature to settle before making any subsequent
adjustments.
IMPORTANT
10GC & AF
Oven Dial
GC & AF
Oven Dial
OFF
45
0
40
0
350
300
15
0
20
0
250
°C
Calibra�on
Trim Screw
Thermostat
Sha� Behind Dial
FIG. A
FIG. B
FIG. C
Calibrating the dial
Set the dial to the most frequently used temperature and allow the oven
to achieve temperature stability. (FIG. B)
Using a 5/64” Allen Key, loosen the knob screw(s) and remove the
knob from the oven. For models 20,30, and 40 remove the compres-
sion pin from the thermostat shaft as shown in (FIG. C).
Using a small blade screwdriver, adjust the trim screw in the shaft
center to adjust the oven’s temperature.
Make slight 1/8th turn adjustments at a time. Allow the oven’s
temperature to be stable before placing the knob.
Follow the steps below to calibrate the oven’s dial (printed) tempera-
ture to the temperature reading from inside the oven’s chamber as
measured by a known accurate device (models 20, 30, and 40 only).
b) Turn the trim screw
clockwise to adjust
the temperature DOWN.
a) Turn the trim screw
counter-clockwise to
adjust the temperature UP.
(-)
(+)
°F
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Voice:
800-482-4328 Opt 2
Technical Support
STEP 2
STEP 3
To adjust the temperature range, rotate the dial to the lowest or highest
setting allowed by the dial before removing the knob.
Insert
Do not modify the oven to operate above the stated maximum operating temperature when adjusting the oven’s temperature range.
Calibrate the dial at the most frequently used temperature using the oven’s thermometer or measuring device known to be accurate.
