Model LD-215 Product Information


Model LD 215 Freezer/Dewar Liquid Nitrogen Temperature/Level Detector Monitor Alarm System.
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Key Features:

  • Application specific probe lengths for different freezers/containers and required LN2 levels. Shaft collar and wrench included for probe positioning.
  • ¼" (6 mm) LN2 level sensing resolution.
  • Low level or overflow alarm modes.
  • Audible & visual out-of-tolerance alarms.
  • Relay contact output for central alarm systems and automatic notification systems.
  • User adjustable initial alert delay and mute periods.
  • User adjustable initial alert condition delay and mute periods.
  • Battery backup (2 rechargeable AA batteries included).

Product Overview:

Safeguard your precious biological materials in liquid nitrogen (LN2) with the LD-215 Liquid Nitrogen Level Detector/Alarm. The LD-215 is designed to monitor cold storage temperature conditions within liquid nitrogen cryogenic Dewars typically used for the cryopreservation of genetic/biological materials, cold storage of vaccines, in vitro fertilization (IVF), and other processes using liquid nitrogen.

The LD-215 tracks liquid nitrogen level using a cryogenic RTD sensor positioned in the Dewar just above, or just below, the target liquid/gas phase boundary. The cryogenic RTD is housed in a stainless-steel probe with an application-specific length and configuration. When the cryogenic RTD sensor registers a sudden increase in temperature due to LN2 evaporation or inflow disruption, the LD-215 goes into alert condition. Alternatively, in overflow mode, the LD-215 goes into alert condition when the cryogenic RTD registers a sudden decrease in temperature due to LN2 immersion.

An alert condition on the LD-215 is signified by 90 dB audio and a flashing red LED visual alarm, so corrective action can be taken before cold storage materials are compromised. An output relay is also engaged upon encountering alert conditions, so that building alarm systems, auto dialers, etc. can be triggered.

Once optimum sensor position is established and the alarm thresholds are set, the LD-215 is ready to continuously monitor LN2 levels and inform you of alert conditions. The LD-215 is shipped with a plug-in power supply and 2 rechargeable AA backup batteries.

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