Helmer Scientific i.Series
®
Ultra-Low Freezer
Service and Maintenance Manual
360173-A/C
21
4.1
Alarm Tests
>
Test alarms to ensure they are working correctly. The freezer has alarms for primary monitor high temperature, primary monitor low
temperature, door open (time), high ambient temperature, low ambient temperature, and power failure.
CAUTION
• Use appropriate gloves when handling cold interior components and stored inventory.
• Avoid sharp edges when working inside the refrigeration compartment.
Notes
• Before testing alarms, protect items in freezer from extended exposure to adverse temperature.
•
If the Settings screen is password protected, enter the appropriate password. If viewing settings for the first time, enter
factory default password of “1234”.
• If the i.C³ monitoring and control system did not display the appropriate alarm during the alarm test, contact Helmer
Technical Service.
• Temperature sensors are fragile; handle with care.
Primary Monitor Probe High Temperature Alarm Test
Notes
• The primary monitor high temperature alarm test should require no more than 90 seconds.
Test the high alarm
1. Touch,
i.C³ APPS
,
Settings
,
Alarm Settings
and record the high alarm setting.
2. Move contents within the freezer to gain access to the primary monitor probe.
3. Using a heat gun or similar auxiliary heat source (use low setting if available),
apply short bursts of heat to the probe.
4. Observe the temperature on the i.C
3
display at which the high temperature
alarm activates.
5. The alarm should activate within 2.0 °C of the high alarm setpoint. If the value
is more than 2.0 °C different, contact Helmer Technical Service for
further instruction.
6. Remove the heat gun, replace the contents of the freezer and close the doors.
Primary Probe Low Temperature Alarm Test
To simulate a low temperature alarm condition, raise the low alarm temperature setpoint to a point above current chamber temperature
displayed on the i.C³ monitoring and control system.
The Primary Probe low temperature alarm test does not test the accuracy of the alarm, but rather verifies the alarm is functional.
Test the low alarm
1. Touch,
i.C³ APPS
,
Settings
,
Alarm Settings
.
2. Touch the plus (+) on the Primary Monitor Probe Low Temperature spin box to change the value to 0 °C. The low temperature
alarm will activate immediately.
3. If the low temperature alarm does not activate, contact Helmer Technical Service.
4. Touch the minus (-) on the Primary Monitor Probe Low Temperature spin box to return to the original setting.
