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S Series Liquid Level Display
Verification & Calibration Cont'd
7) If display reading is above the actual liquid level, turn the P6 adjustment very slowly clockwise
until the display reads the actual liquid level.
8) Now disconnect the Level Sensor, turn the P7 adjustment counterclockwise until the display
reads less than zero, then turn the P7 clockwise to zero. Reconnect the Level Sensor.
9) Wait 15 minutes and re-check the level display against the actual liquid level to be sure
the setting has remained accurate.
10) Once again unplug the controller from its power source.
11) Replace controller into the 1500 or 3000, or back-panel onto the 5000, and secure the screws.
12) Reconnect all connections, then connect power to the unit, and proceed to normal operation.
IMPORTANT: Stop turning adjusters immediately when display reaches desired number.
V Series Liquid Level Display
Verification & Calibration
The following section includes verification and calibration procedures for the Liquid Level
Display on the Vapor or Isothermal Liquid Nitrogen Storage Units.
V Series Level Display Verification
1) With power on and no alarm condition occurring, look at the liquid level display and note
the current reading.
2) Now "read" the liquid level in the vessel. Because the liquid is contained within the vessel
walls, it is necessary to watch the coloration of the inside of the vessel to determine where
the level is. There will be a slight variation in the color of the tank walls at and below the
liquid level. The walls of the vessel will look somewhat "wet" below the liquid level line. It
may be necessary to look carefully to perceive this change in the look of the tank walls, but
it will be there. Remember, however, not to place your head down into the vessel when
watching for this change, as this may be hazardous to your health.
With proper protection (Cryo-gloves or equivalent) place a yardstick into the storage vessel
until it touches the bottom. Note where the indication of the liquid level measures on the
yardstick.
3) Compare the reading on the level display to the measurement on the yardstick. If the level
display is showing a greater discrepancy, the display should be calibrated using the
following steps.
(Continued on next page)
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