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VII MAINTENANCE
The HS-55 is almost maintenance-free. You will need to ensure that your power supply is
sufficient for the equipment that you have installed. (See Specification Page HS-55 100-06).
As the compressor pump’s duty cycle is a few minutes every 48 hours (set at 80
bubbles/minutes), it will last for many years. The voltage sensor prevents the HS-55 from
running from running the battery voltage below 11 Volts for long periods of time. This will
protect the pump and many other components of the HS-55 in case of a system leaks or other
malfunctions.
All fittings must be secure. At 80 bubbles/minutes, even a tiny leak will allow the entire gas
flow to escape.
VIII
BUBBLE RATE ADJUSTMENT
The chart below has been prepared to show the relationship between the bubble rate at the test
orifice and the equivalent rates that would be observed on a sight glass bubble unit.
Once the desired bubble rate has been achieved tighten the screw to lock the metering valve.
Bubble rate at
Equivalent Sight
Test Orifice
Glass Rate
15 60
21 80
27
100
35
120
Note:
Bubble rates detailed above are only an approximate guide for the purpose of conserving
gas and have no influence on the performance of the transducer.
Example:
To adjust the HS-55 to the equivalent of 80 bubbles per minutes, the metering valve
should be rotated anticlockwise if the bubble rate is below this amount, or clockwise if bubble
rate is above 80 per minute. There should be 21 bubbles per minute emerging from the test
orifice.
Gas Purge Compressor
Issue 7:
16/12/03
© Copyright
HS55 100-018
