Watchdog Liquid Nitrogen Level Sensor Alarm Cryogenic LN2

Description

The sale is for one factory new Watchdog liquid nitrogen monitor configured as a stand alone low level alarm (WD6-BA12-S.25). This includes a Watchdog with 6 foot sensor cable, low level alarm plug with audible alarm buzzer, 24 vdc wall mount power supply (503.002) and owners manual.
The Watchdog is a thermistor based level sensor for liquid nitrogen monitoring and control applications. It is equipped with a bi-color LED that tells the state of the sensor (Red - Sensor Warm Out of the LN
2
, Blue – Sensor Cold In the LN
2
). The Watchdog continuously monitors the sensor and will alarm if there is a sensor failure. It has separate relay outputs for control and alarm functions. It is externally configured for use via a Red or Blue DB-9 plug. When the Watchdog LED is the same color as the plug everything is normal, when the colors are opposite it activates the output. It can be configured as a stand-alone High-level (Red plug) or Low-level (Blue plug) monitor with local or remote alarm function. It can be used to control an overfill shutoff valve or low-level fill valve. Two Watchdogs can be ganged together to function as a basic liquid level controller. Although the Watchdog is powered by a 24 vdc circuit it can switch externally supplied AC or DC power as well. In addition to the numerous built in functions and capabilities external circuitry can be added for timed control, alarm latching and similar functions.
Features:
Tri-State Control Output
Separate Alarm Output
Visual Sensor State Indicator
Continuous Sensor Diagnostics
3 A Power Switching, Internally or Externally Supplied
Low Heat Input to Dewar
Small Footprint
Low Cost
Discount available to educational institutions.