6.
Installation
The ACCUBUBBLE will return accurate and reliable pressure data. It must be mounted vertically,
meaning that the circular connectors and orifice line connection should point down. This is so that
the sensor with the tubing connector and cable connector points downward. This will prevent any
moisture from following the cable or tubing into the ACCUBAR sensor.
The ACCUBUBBLE mounts to a panel or surface through four holes that are accessible in the
corners of the fiberglass enclosure
The ACCUBUBBLE pressure fitting accommodates an 3/8" OD tubing.
Orifice installation:
Ensure that the orifice line is installed with a continuous downward slope to the water. If there are
low points in the line and moisture collects there, you may get erroneous readings. The maximum
length of orifice line to use with the ACCUBUBBLE is 500 ft. If longer lengths of orifice line is
required, call Sutron Customer Service at 703-406-2800 for details on how to do this.
Electrical connections:
Refer to Chapter 3 on Cabling for a description of the electrical connections.
AccuBubble Setup
Expected Initial setup steps for unit at address 0.
0XFD!
To eliminate any unexpected configuration in the unit and reset it to factory defaults.
0XPR+60+30!
To ensure that the line is completely purged.
0XPC!
A
0D0!
Will return the computed values. If any of the numbers are negative, then repeat
step. If the software version is before V2.0, then use the
0XPT
to enter the values returned
by the 0D0!
0XPL!
to check the system for leaks and check the 0XPT timing parameters
See chapter 2 for an in-depth explanation of these steps.
Leak Checking The System
It is important to check for leaks when installing the sensor. To check for leaks, use the following
command.
aXPL+leak_check_time! Note: The leak check time parameter is optional.
This command will perform a normal reading, i.e., run the pump for the currently specified
purge_on time, wait the currently specified purge_off time, and then take a pressure reading. The
unit will then wait the specified number of seconds (30 seconds if nothing is specified) and then
take another pressure reading. The returned value will be the pressure difference between the two
readings in the default pressure units. The value returned will be affected by any changes in the
water level during the leak_check_time. If the water level is steady during the leak_check_time
then the returned value should be less than the level of accuracy you are looking for. Ideally it
should be less than 0.01 feet of water. If the number is larger than what is acceptable, and it is
thought that the system is leak free, try increasing the current purge_off time specified by the XPT
command.
Note: There may be small fluctuations due to thermal and other effects
. A leak would be
indicated by a significant and continual decrease in pressure. A continual decrease in pressure can
be determined by increasing the leak_check_time. If a 60 second leak check result is about twice
the 30 second result, then the system for be checked for leaks. If a 60 second leak check result is
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