ThermoForma 3033, Operating And Maintenance Manual

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The Reheat terminals on
the microboard for resistor
hook-up are 14 and 15.
The RH terminals on the
microboard for resistor hook-
up are 11 and 12.
Note: Do not leave any
inputs to the microboard dis-
connected during zero and
span phase, or errors will
occur. Proceed to the Reheat
Calibration procedure.
5.12 Temperature Alarm/Monitor Calibration
Note: Allow a minimum of 6 hours for stabilization from a
cold start up to 37°C.
Place a thermometer in the center of the chamber and
adjust the zero trim pot on the Temperature Alarm/Monitor
board to match. (Refer to Section 6.1.c.)
5.13 Reheat Calibration
Place the Temperature Control module in the calibration
mode using the inverted Y key.
Check the LCD display to ensure that the word Set does
not appear. If it does, depress the inverted Y key to remove it.
The module is now in the Zero mode.
Place the Reheat probe, located in the outlet tube of the
humidity reservoir (not in the reservoir itself) in a beaker with
the same thermocouple or thermometer used to calibrate the
monitor module.
Using the up arrow and down arrow, adjust the display to
match.
Put thermal compound on the tip of the probe and insert it
fully into the sheath. Seal it with silastic.
5.14 RH Calibration
1. Read the RH in the cabinet with a reliable humidity indi-
cating device. Note the difference between the indicating
device and the LCD readout.
2. Put incubator in calibrate mode using inverted Y key.
Next press the inverted Y key until the word Set disap-
pears from the window. You are now in the RH Zero
mode. Using the up and down arrow keys, adjust the
display (0.2°C) for each percent difference in the LCD
readout compared to the indicating device.
Example: If the indicating device is 95% and the LCD readout
is 90%, with the RH module in the Calibration mode, raise the
displayed temperature (0.2°C) for each percent of difference, or
(0.2) x 5% = 1.0. Raise the displayed temperature 1.0°C.
3. Return the incubator to the Run mode by turning the
power off, then on.
5.15 Temperature Offset Adjustment
1. Make sure unit is stable before proceeding.
2. Place the Temperature Control module in the Calibration
mode, EXCEPT depress the up arrow instead of the
inverted Y key. Use the inverted Y to remove the word
Set.
3. Use the up arrow and down arrow keys to adjust the
Temperature Control to match the Temperature
Alarm/Monitor module.
4. Return incubator to Operation mode.
5.16 CO
2
Calibration Procedure
Equipment required: Fyrite, or another independent
method of CO
2
measurement.
1. Put the Run/Program key switch on control panel in
Program mode.
2. Change the CO
2
setpoint to 1.0%.
3. Default CO
2
values by depressing the up arrow key on
the CO
2
module and turning the main power switch off,
and then back on.
4. Check CO
2
setpoint. If it now reads 0.0%, the default
was successful. If not, then repeat Step 3.
5. Locate “hidden” key to the right of the down arrow key
on the CO2 module. (This is a touch-tone key like the
other keys).
6. While depressing the “hidden” key on the CO
2
module,
turn the incubator power switch “OFF” and back “ON”.
Continue holding the “hidden” key until the high audible
tone stops.
Model 3033 and 3860 Series _________________________________________________________________Service
5 - 6
Figure 5-6
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