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Freezer Liquid Nitrogen Level Detector/Alarm

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$697.00
QuantityPrice
SKU: HAMALM006
Provided: Each
100-ohm cryogenic RTD probe
Alarms: Audio 90db Tone, Visual LED, SPDT Relay

Low or high-liquid-level detection
Cryogenic RTD Probe is Included

Sensor: Cryo 100 ohm RTD attached to 10' Teflon wire with a Stainless Steel Sheath Length TBD. The length of the sheath can be customized from 2"-24". Length Example: Trigger Alarm when the LN2 level falls below 15" from the top of the Dewar. Request a stainless steel probe sheath length of 15"

Notable Features

The HAMALM006 uses a cryogenic RTD to sense the surface of liquid nitrogen by monitoring the temperature change of the probe, as the liquid drops away. Normally, the alarm will sound and the output relay will change state as the level drops below the tip of the probe.

The alarm can be silenced for a select-able period of time by pressing the MUTE button, the ALARM LED will continue to flash and the output relay will stay in the ”alarm” condition. Returning to normal operation, meaning probe submerged in LN2, will clear the mute and reset the alarm.

An alarm delay can also be specified. After the unit recognizes a temperature above LN2, the green status(TIMING) LED will switch to YELLOW and the unit will delay for a select-able period of time before alarming.

Any alarm condition, muted or not, will cause the SPDT contacts to switch to alarm state. The user can wire to the “Normally Open” (NO, closed on alarm) or “Normally Closed” (NC, open on alarm) contacts.

The contacts are isolated and can switch a load of up to 1 Amp, Typically, the output contacts connect to a remote beeper, dialer, or Central Monitoring System all of which can be provided by TIPTEMP
 
  • User-programmable alarm delay and mute periods
  • Audio and visual alarms
  • Rechargeable battery back-up
  • Tool-less spring-loaded connectors
  • Includes SPDT relay output
  • Low or high liquid-level detection
  • Power Requirements:6-12VDC, 300mA max includes 120-120VAC UL Listed power supply with 10' cord
  • Battery Backup:2 NiMH AA rechargeable batteries with built-in trickle charger
  • Dimensions:2.75"x5.5"x1.1"
  • Output: SPDT relay rated 1A@30VDC or .5A@120VAC
    Relay Contact Ratings (Restive Load):
    Max Switched Power:30W(DC) or 62.5VA(AC)
    Max Switched Current: 1 Amp
    Max Switched Voltage:220 VDC or 250 VAC
    Max Carry Current:2 Amp
  • Alarm Tone: 90db Alarm Light Flash: 1 hz
  • Sensor: Cryo 100 ohm RTD attached to 10' Teflon wire with a Stainless Steel Sheath. The length of the sheath can be customized from 2"-24"
  • (1) HAMALM006 Cryo Liquid Nitrogen Detector
  • UL listed 120-220V AC power supply with 10’ cord
  • Cyrogenic RTD Probe - Client must choose length
  • Rechargeable AA Batteries
  • Expert Technical Support
The LD-215 LN2 level detector/alarm uses a cryogenic RTD to sense the level of liquid nitrogen by monitoring the temperature change at the liquid-gas boundary. The unit can be configured for either low-level or high-level detection.

For low-level detection, the tip of the probe should be placed ¼” above the lowest desired liquid level. When the liquid drops to this level, the alarm will sound and the relay output will change state. An optional time period can be specified to delay the activation of the beeper and relay.

For over-flow detection applications, the tip of the probe should be just submerged at the highest desired liquid level. In this configuration, the alarm condition occurs when the liquid rises enough to submerge the tip of the probe.

The relay output is SPDT (Form C) which includes both normally open and normally closed dry contacts. The contacts are isolated and can be used to control a restive load up to 1 Ampere.

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