34
V & S Series High & Low Level Alarm,
and Temperature Display Verification
The following section includes verification procedures for the High and Low Level Alarms,
and the Temperature Display on the Standard and Isothermal Liquid Nitrogen Storage Units.
V & S Series Low Level Alarm Verification
1) Using the manual valve on the liquid nitrogen supply tank, turn off the liquid supply.
2) Create a low level alarm condition. This is done by adjusting the level setpoints above the
actual liquid level. If necessary, refer to page 20, display #16.
Example: The liquid level is 6 inches. Adjust the high level setpoint to 10, and the low level
setpoint to 8. This will cause the controller to go into an auto fill.
In 7 to 10 minutes a low alarm should occur. This will be indicated by the LOW ALARM
text flashing and the audible alarm sounding. The remote alarm output will activate also.
3) Return setpoints to the desired settings.
4) Open manual valve on supply tank to resume normal operation.
V & S Series High Level Alarm Verification
1) Create a high level alarm condition. This is done by adjusting the level setpoints above the
actual liquid level. If necessary, refer to page 20, display #16.
Example: The liquid level is 6 inches. Adjust the low setpoint to 2 and the high setpoint to 4.
In 3 to 5 minutes a high alarm should occur. This will be indicated by the HIGH ALARM
text flashing and the audible alarm sounding. The remote alarm output will activate also.
2) Return setpoints to the desired settings. Unit is now ready for normal operation.
If the alarm functions aren’t occurring as described above, repeat the verification procedure. If
one or both of the alarms are still not functioning properly, refer to the troubleshooting guide
at the end of this manual for further instruction.
V & S Series Temperature Display Verification
1) Open storage unit lid and locate temperature sensing probe (see diagram: for Series 1500/3000
see page 29, #18; for Series 5000 see page 30, #19.
2) Remove probe from protective sleeve.
3) Submerge the sensor probe into liquid nitrogen. The digital temperature display should read
-195˚ to -196˚ degrees celsius.
4) Remove probe from liquid nitrogen and place tip of probe in an ice bath (mixture of ice and
water), and wait 30 seconds. While the probe is submerged the digital display should read
-1˚ to +1˚ degrees celsius.
5) Return probe into its protective sleeve at the desired depth.
6) Close the storage unit lid and resume normal operation.
If the temperature display doesn't operate as described there may be a problem with the
probe, or the probe connections. See the Troubleshooting Guide on page 35 for further
information if a problem is detected.
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