B medical systems MT100, Инструкция по эксплуатации

Страница: 18 / 28

18
6 Alarms
CAUTION
• Upon the occurrence of an alarm situation, attempts must be made to discover the reason for the alarm and
resolve it as quickly as possible. If that is not successful the necessary measures must immediately be taken
to avoid damaging the stored goods.
6.1 Temperature Alarm
• As soon as the alarm temperature values (max or min) are exceeded, the instrument generates a visual and
an acoustic alarm.
• Visual alarm : the alarm-symbol lights up and the display shows the actual temperature together with
the respective alarm label : “ HA ” for high alarm or “ LA ” for low alarm. The display returns to the normal
temperature display mode, as soon as the alarm situation has been resolved.
• The acoustic alarm signal can be muted for a predefined time (20 minutes) by pressing one of the buttons
on the electronic control unit. If the alarm situation is still present after the predefined time, the buzzer will
restart. The mute button for powerfail alarm on the control panel has no function in case of a temperature
alarm.
• The following temperature values are predefined for the temperature alarms:
in 4°C - mode : High Alarm : 6°C Low Alarm : 2°C
in 22°C - mode : High Alarm : 24°C Low Alarm : 20°C
• After initial switch-on and after every change of the temperature set-point, the temperature alarm function
is disabled for 3 hours.
6.2 Powerfail Alarm
• In case of a power failure (while the unit is being operated), a visual and an acoustic alarm is generated:
visual : the Power-LED turns from green to red.
acoustic : the buzzer starts.
• The buzzer can be silenced by pressing the mute button for powerfail alarm. The buzzer is deactivated until
the powerfail situation has been resolved.
6.3 Sensor Failure Alarm
• The device is equipped with 3 temperature sensors.
• An alarm is generated in case of failure/error of a sensor:
• Error message “ P1 ” : Regulation sensor failure. The display alternates between the error message “P1”
and the indication of the display sensor temperature. In case of regulation sensor failure, the unit is
regulated by a pre-programmed ON-OFF-compressor cycle.
Important: This regulation cycle is designed for the 4°C temperature set-point operation only.
• Error message “ P2 ” : Display sensor failure. When the error message “P2” is displayed, the regulation
of the appliance is maintained, but no temperature alarm signal is generated.
• Error message “ P4 ” : Evaporator sensor failure. The display alternates between the error message “P4”
and the display sensor temperature. The evaporator sensor controls the automatic defrosting process. In
case of evaporator sensor failure, the defrosting of the unit is completed on a pre-programmed time basis
(see chapter “Automatic Defrosting”)
• Together with the visual display of the error message, an acoustic alarm is generated. The buzzer can be
muted for a predefined time of 20 minutes by pressing any button on the electronic control unit. If the alarm
situation has not been resolved after this predefined time, the buzzer starts again. The mute button for
powerfail alarm on the control panel has no function in case of a sensor failure alarm.