Eppendorf Galaxy CO2 Sensor - Manual (Page 90)

Equipment options
Galaxy
® 170 R/170 S CO
2
Incubators
English (EN)
90
1. Press USER .
2. Select DISABLE and toggle HUMIDITY WARNING from ON to OFF using the keys.
3. Press ENTER .
4. Refill the humidity tray with 1.5 liters of warm (~37.0 °C) distilled water.
When the water level has been replenished and the door is closed the system will re-arm.
12.9.2 Humidity display and alarm system
The Humidity Display and Alarm System is designed to measure the relative humidity level (rH) in the
chamber and to display the chamber rH on the display screen. Under normal operating conditions and
using the supplied humidity tray, the rH level will reach a maximum of 95 - 96 % after being left overnight.
The Humidity Sensor will activate an alarm if relative humidity falls below the preset limit of 88 %. The
sensor is located on the rear wall of the chamber, below the CO
2
Sensor. The Humidity Display is always
active, but the Alarm System can be deactivated as follows:
1. Press USER .
2. Select DISABLE , and toggle RELATIVE HUMIDITY from ON to OFF using the keys.
3. Press ENTER .
The Alarm System is disarmed for 1 hour or when it achieves 88% R/H, when the incubator is switched on,
or if the door is opened and closed.
An Alarm is signaled by a flashing RH LOW ALARM message. If the humidity level rises above 88 % during
the 1 hour time out period, the Humidity Alarm System will be armed. The Alarm will then be triggered
when the R/H level falls below 88 % and will be recorded by the Alarm Log. The Alarm can be
acknowledged by pressing any key. No further Alarms will occur unless the door is opened and closed, or
power to the incubator is removed then restored.
NOTICE! Risk of damage to equipment
The bottom surface of the incubator is heated to over 150 °C during the decontamination
cycle which may affect the sensor or the cable if left in contact with the bottom of the
incubator.
 Never leave the humidity warning sensor on the bottom surface of the incubator during a
high temperature decontamination cycle. Place it on the shelf above the humidity tray and
ensure that the cable is not resting on the base of the incubator chamber.
The Humidity Sensor is protected by a white porous plastic cover, care must be taken not to
spill any liquid into the sensor. The white porous cover should be protected with the black
plastic sleeve provided when cleaning the incubator. The white porous cover can be removed
and autoclaved but care should be taken not to touch or wet the sensor when the cover is
removed.