GE-MON

A minus eighty freezer usually fails at night or over a weekend. Its own audible alarm sounds in an empty corridor, and the first person in on Monday finds years of samples thawed. Central monitoring exists for that scenario, and the answer is not simply "add a sensor": the right threshold, the right delay, an escalation path that reaches a person, and a record that can later serve as evidence are all required together.

What is monitored

Area	Parameters
Freezers (+4 to −86 °C)	Temperature, door contact, device alarm contact, loss of device communication
Cryogenic tanks	Internal temperature, liquid nitrogen level, fill status, controller alarm
Incubators	Temperature, CO₂, O₂, relative humidity, door
Cleanroom and laboratory	Temperature, humidity, differential pressure, particle count, cabinet airflow
Cryogenic storage room	Oxygen concentration, visual and audible warning, HVAC relay control
Infrastructure	UPS and generator status, water leak, medical gas and LN2 supply line

Staged alarms

Threshold, delay and escalation path are configured independently for each device. A typical chain waits for a defined period, then sends email, then SMS, then places a voice call to a responsible list. Who acknowledged the alarm, when and with what reason is part of the record — alarm delays should be justified and documented, not left implicit.

How data is collected

• GE-202 for temperature, humidity and contact inputs over MQTT
• GE-100 for oxygen, carbon dioxide and differential pressure over Modbus
• GE-EDGE for existing controllers from PHCbi, Haier, Worthington, Chart, Nüve and others
• Existing monitoring hardware from third parties can be adopted rather than replaced

Records and reporting

Measurements are stored in a time series database with device, sensor and timestamp. Dashboards, historical charts with threshold bands, excursion and recovery curves, and PDF or Excel reports for a chosen period are available for audit. Access is role-based and changes are written to an audit trail.