ThermoForma 3033, Operating And Maintenance Manual

Page: 17 / 47

3.6 Auto Zero Alarm
If the calibration correction value is larger than that of a
typical instrument drift, it is considered an error and the calibra-
tion value will not be changed.
This indicates a problem such as elevated ambient,
CO
2
component failure, plugged lines, electrical
noise, etc. Therefore, the incubator will continue
to use the last correct zero value.
Four consecutive errors are considered an alarm condi-
tion. The %CO2 in the CO
2
display will then flash and the audi-
ble alarm will sound.
Note: If a subsequent auto zero calibration value is within the
range, the alarms will be turned off.
A CO
2
setpoint of 00.0 will disable the Auto Zero alarm.
3.7 RH Control Panel
The Relative Humidity (RH) Control Panel contains an
amber LED, an LCD readout and three Sensi-Touch buttons.
a. Relative Humidity Liquid Crystal (LCD) Display
The LCD readout displays either the actual chamber RH or
the RH setpoint. Touching the inverted Y button selects the dis-
play mode.
When the inverted Y button is pressed, the word SET
appears on the left side of the LCD window. With the key
switch turned to Program, the RH level can be set by touching
the up arrow or the down arrow. Pressing the inverted Y button
again changes the display to read the chamber humidity.
If the humidity reservoir runs low on water a steady audi-
ble alarm will sound and the symbol H
2
O will flash in the LCD
window. Pressing any of the nine Sensi-Touch buttons on the
control panel will silence the alarm for 10 minutes.
When a low water alarm occurs, add 3 liters of sterile dis-
tilled water to the humidity reservoir. Follow the instructions in
Section 2.10.
Note: No humidification will take place until the chamber tem-
perature is within 1° of the temperature setpoint. During this
time, the LCD reading will default to two dashes (“—”), and
the RH recorder output will be the RH setpoint value.
If no humidity control is desired, a 00.0 setpoint should be
selected. This will cause the display to show “—” and will also
defeat the H
2
0 alarm.
b. Humidity Indicator Light
The amber LED will light as the unit calls for more mois-
ture to maintain the humidity setpoint.
3.8 Temperature Control Panel
The Temperature Control Panel contains an amber LED, an
LCD and three Sensi-Touch buttons.
a. Temperature LCD Display
The LCD readout displays the selected temperature set-
point.
Note: On this module the inverted y button performs no func-
tion.
With the key switch turned to Program, the temperature is
set by pressing the up arrow or down arrow buttons.
Note: This module displays setpoint - not actual temperature.
b. Heat Indicator Light
The amber Heat LED lights when the temperature con-
troller calls for more heat in the chamber.
Model 3033 and 3860 Series _______________________________________________________________Operation
3 - 3
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com