QLA100 Liquid Nitrogen Level Alarm

Automatic monitoring of liquid nitrogen levels with visual and audible alarms.

The Quantum Liquid Nitrogen Level Alarm consists of a level sensor, monitor/alarm unit and a low output voltage power supply unit.

The monitor/alarm unit continuously monitors the signal from the level sensor and houses the audible and visual alarms. It can be fitted to the body, lid, neck or carrying handle of a liquid nitrogen container or can be mounted on a nearby wall or surface. The unit is supplied fitted with 'Velcro' pads but can be secured equally well to a solid surface with screws.The compact power supply unit is fully enclosed in a robust, moulded case. It provides a low voltage output (15V. d.c.) through an interconnecting cable to the monitor/alarm unit, backup power supply available.

The level sensor is placed in the vessel at the required level, the monitor/alarm unit is fixed in place and the power supply unit is connected to the mains supply. When liquid nitrogen covers the level sensor the green 'Normal' light is lit, however, when the liquid nitrogen level falls below that of the level sensor, the red alarm light flashes and the audible alarm bleeps. At the same time any suitably connected external alarm is activated, auto dial unit. If, the level sensor for any reason should be damaged, short circuited or removed, the unit emits a constant audible tone.

Key Features

Continuously monitors levels of liquid nitrogen.

Adjustable sensor position.

Built in visual and audible warnings if level becomes 'Low'. 'High' level option available.

Connection for remote alarm (dry contact) to in house monitoring systems, auto dial units.

Easy to fit and install.

Compact and lightweight.

Reliable and maintenance free.

Independent warning of sensor damage.

Stand alone or multiple vessel monitoring system.

Optional sensor mounting kit.

Sensor occupies negligible space in vessel.

For use with liquid nitrogen refrigerators, cryostats, vessels, dewars and cold traps.
The sensible precaution for all valuable refrigerated samples and all processes where liquid nitrogen must not run out.


Power Requirements:

Mains powered 240/220V, 50/60Hz (110V available)

Power supply unit dimensions:

W60 x H55 x D90mm - 15V DC supplied with product

QLA100 dimensions:

W80 x H100 x D40mm

Interconnecting cable: Length 2 metres, voltage 15V DC
Sensor lead:


Length 1.5 metres, diameter 2.5mm (other lengths available as required)

Level sensor: Length 6mm, diameter less than 4mm