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The GSM-alarm for freezers and LN-tanks

NCMM has GSM-alarm systems for the ultra-low freezers and for the Liquid Nitrogen (LN2) tanks.

Organisation of the GSM-alarms

Image of gsm alarm
GSM alarm. Photo: UiO.

There are 3 separate alarm-systems at NCMM, corresponding to the physical locaiton of labs and freezers.

Each GSM-alarm is organised as an open alarm with the freezers/LN-tanks connected in parallell. If there is an issue with one freezer, it can be disconnected, if neccessary, and the alarm-system will return to normal operation.

Light on terminal 1= freezer-alarm.
Light on terminal 2= LN-alarm.

The GSM-alarm activates one SMS-message to the group leaders on the list below.The group leaders have to contact each other to organize that someone competent comes to NCMM to investigate why the alarm went off.

Contact persons

The mobile-contacts  


 Freezers and LN2-tanks

Johannes Landskron

471 75 209

NCMM - E3 only freezers
Nikolina Sekulic 909 540 06 NCMM - E2 only freezers

Sandra Lopez-Aviles

912 40 218

NCMM - E2 only freezers
Camila Esguerra 950 40 178 NCMM - E2 only liquid nitrogen-cell tank
Liv Bjørland* 915 62 054 NCMM - E3,  E2 and D3

Judith Staerk

942 35 011 NCMM - D3 freezer 1 and 3
Emma Haapaniemi 413 84 367 NCMM - D3 freezer 2

*HSE-coordinator Liv Bjørland - is responsible during day-time for freezers on both floors at NCMM, but just backup at evenings, nights and weekends. The HSE-coordinator gets a separate message to know that the systems are working and that the temperature in the room is correct.

SMS and the alarm sound

When the alarm is activated, there is a delay of 10 min for freezers in House E, and 30 min delay for the LN-tanks before the alarm sends an SMS. The delay for the freezers in House D is 40 min. If the system is back to normal within these periodes, no alarm is given. If the alarm is activated and then turns back to normal, the group leaders will receive a new message about normal situation. For the freezers, the ususal setpoint for the alarm is minus 70 (for the -80 ) and minus 135 (for the -150). For the LN-tanks a specific low-level of Liquid Nitrogen (ca. 14cm) will activate the alarm.


Simultaneously with the SMS, the activated alarm will cause a loud sound in the corridor in House E. This sound will not stop until the “problem-freezer” is disconnected or fixed. To avoid an everlasting sound you may turn off the switch while working to fix the problem. At the 3rd floor you will find the switch above the door to the freezer-room. At the 2nd floor you will find the switch in the admin-corridor above the main entrance. Both are mounted close to the box causing the sound.

When the SMS is activated you will not receive a  new SMS until the problem is solved. This means that either the failure is corrected or that the “problem-freezer” is disconnected from the alarm system. Usually we will not be able to solve the problem right away. Usually, we need to move the samples to a back-up freezer and disconnect the freezer or tank causing the alarm. The alarm-system will record a disconnect as “problem solved” and monitor the system as normal. 

Remember that after an alarm-situation, you have to re-activate the sound alarm, and if possible, put the disconnected freezer back to the alarm circuit.

Published Dec. 1, 2017 5:25 PM - Last modified Jan. 30, 2020 4:00 PM