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AQUALAB VSA
Table 6 Troubleshooting the AQUALAB VSA (continued)
Problem Possible Solutions
Balance Communication
Failure error message
Press the check button to retry balance communication.
Cycle the power on the instrument.
Contact Customer Support.
Sensors are reading outside
of the typical range
If, after cleaning the instrument and following troubleshooting
guidelines, there is still a measurement error, navigate to the
Diagnostics screen. If the sensor is reading outside of this range,
contact Customer Support.
If, after cleaning the instrument and following the other troubleshooting hints, consult
the Diagnostics screen that displays values for component performance. Navigate to the
Configuration tab and then scroll down to the Diagnostics option. Press Enter to open a list
of components and their values.
This screen shows typical values for the temperature sensors on the instrument. Press up
and down to scroll between the different pages. Lid, base, and sample temperatures may
fluctuate but should not change more than 0.03 °C. Typical ranges for the lid, base and
sample temperatures are between 24.5 and 25.5 °C, when unit temperature is set to 25 °C.
If the mirror temperature is at lid temperature, the cooler has failed and must be replaced.
If the mirror is below the lid temperature or appears to be random, the thermocouple wire is
broken and must be repaired. If the lid temperature is much higher than the set temperature,
the lid fan may have failed and must be replaced.
• RH: The capacitive sensor RH percentage, which should always be between 0 and 100%.
• Weight: The weight measurement updates in real-time and can be zeroed for
measurements by pressing the scale icon (second button from the left). If the weight reads
overload or underload, the balance is broken and needs to be replaced. A negative value
indicates that the balance needs to be re-zeroed if you want to take weight measurements.
• Optical: A typical optical range is between 500 mV and 2900 mV.
• Latch: Open and close the latch while monitoring the latch status on the screen. If the
screen does not update the latch status, the latch magnet may need to be reseated (with
the correct polarity) or the Hall Effect sensor needs to be realigned with the magnet.
• Actuator: The Act button toggles the actuator on and off, lifting the sample pan up and
down to confirm the actuator functions properly. Use this button to verify that the actuator
works correctly and that it is not throwing off weight readings. Occasionally contaminants
or defects can cause the cylinder to stick and prevent accurate weight measurements.
• Pump: The pump pressure is only valid when the pump is active. When the pump is off,
the pressure should be between 0 and 0.7 kPa. This pressure reading also applies to an
auxiliary air supply. When the air supply is active the pressure in the system should not
exceed 52 kPa. If the pump pressure continually reads zero (even when you press the
switch desiccant button) then the pump system may need to be serviced.
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