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Continuously monitor LN2 level to a customizable depth (2 - 24").

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 immersion in LN2.
  • LN2 probe length: 2 – 24" (5 – 61 cm)
  • LN2 level sensing resolution: 0.25" (6 mm)
  • Sampling interval: ~4 seconds
  • Battery Backup Time: >12 hours, typ
Unit of Measure

Technical Specs

Brands

 N/A Hampshire Controls

Depth Range

 N/A 2 to 24 in

Customer Specified Liquid Nitrogen ((LN2) Level

 N/A 2 to 24 in

Note for Customer Specified Liquid Nitrogen (LN2) Level

 N/A Custom Configurations Available Upon Request

Liquid Nitrogen (LN2) Level Resolution

 N/A 0.25 in

Sampling Interval

 N/A ~4 Seconds

Liquid Nitrogen (LN2) Low Level Indicator

 N/A ALARM when tip of probe is NOT immersed in Liquid Nitrogen (LN2)

Liquid Nitrogen (LN2) High/Overflow Indicator

 N/A ALARM when tip of probe is IS immersed in Liquid Nitrogen (LN2)

Selectable Alarm Delay Periods

 N/A 0 minute1/2 minute1 minute5 minute10 minute30 minute

Selectable Audible Alarm Delay Periods (Mute or Disable)

 N/A 10 minute15 minute20 minute30 minute5 minute60 minute

Output Relay (Dry Contacts)

 N/A Single Form C (Single Pole Double Throw (SPDT)),Normally Open (NO) or Normally Closed (NC), user adjustable delay period

Battery Backup

 N/A 2 ea. AA 1.2V NiMH 2500 mA·h, 30 mA built-in trickle charger, ~12-hour life

Price

 N/A 702.00 USD

Sensor and Probe

Cryogenic Resistance Temperature Detector (RTD)

 N/A 100 Ohm

Lead

 N/A 10 ft

Material

 N/A Polytetrafluoroethylene (PTFE) Jacketed Stainless Steel Sheath

Power Adapter Input

Alternating Current (AC) Input Voltage

 N/A 100 to 240 V

Input Frequency

 N/A 50 to 60 Hz

Root Mean Square (RMS) Current at 115 Volt (V) Alternating Current (AC) Voltage

 N/A < 0.35 A

Note for Power Adapter Input

 N/A UL listed, 2-prong US

Power Adapter Output

Direct Current (DC) Output Voltage

 N/A 12 V

Output Current

 N/A 0.6 A

Output Power

 N/A 7.2 W

Options

N/A Customer Specified Monitoring Depth

  • 2" to 24" stainless steel probe depth
  • LN2 Low Level Indicator OR LN2 High/Overflow Indicator

Features

N/A

  • Continuously monitors LN2 level to customizable levels (2" to 24", 51 mm to 610 mm)
  • Application specific probe lengths for different freezers/containers and required LN2 levels. Shaft collar and wrench included for probe positioning
  • 1/4" (6 mm) LN2 level sensing resolution
  • Simple pushbutton calibration
  • Low-level or overflow alarm modes
  • Audible & visual LN2 level alarms
  • Relay contact output for central alarm systems and automatic notification systems
  • User adjustable initial alert delay and mute periods
  • Battery backup (2 rechargeable AA batteries included

Available Options

N/A

  • User specified LN2 detection level, cryogenic RTD at the end of a 2" to 24" (51 mm to 610 mm) stainless steel sheath
  • Customizable probe configurations.  Add 90° bends to the stainless-steel sheath to mount the probe over the lip of the Dewar
  • Single Form C (SPDT) relay contact output, normally open (NO) or normally closed (NC) 
  • Optional mounting bracket

Additional Information

N/A 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 liquid nitrogen level within the cryogenic Dewars typically used for the cryopreservation of genetic/biological materials, for the cold storage of vaccines, for in vitro fertilization (IVF), and for 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.