H-3311 lcd display – Xylem H-3311 User Manual
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H-3311 LCD DISPLAY
The H-3311 has the same functionality as the H-3301 with the addition of a built in display and
manual offset adjustment. The LCD display shows the last measured value. The display uses ultra low
power and is always visible.
The offset adjustment is a rotary digital encoder and is accessed by removing the attached dust
cover. The adjustment encoder has a screwdriver slot and is easily rotated with a screwdriver or
other flat blade tool. Replace the dust cap whenever the adjustment is not being used.
Overview
The H-3311 has a ‘Read’ button that when pressed will cause the unit to continuously make
measurements and update the display. The display will flash when the unit is making continuous
measurements indicating the display is being updated even if the value is not changing. When
the button is released the display will freeze with the last measured value displayed. Measurement
requests from an attached SDI-12 data logger will also cause the display to update.
Read Button Operation
While the ‘Read’ button is pressed, the Adjust screw may be turned to increase or decrease the
current stage value. With a positive slope rotating the adjustment screw clock-wise to increment
the value and counter-clock wise to decrement the value. Turning the Adjust screw slowly will
change the thousandths digit while turning the screw fast changes the tenths digit. This allows
one control to make both fine and course adjustments.
Using the Adjust Knob to Change Current Stage Value
If the ‘Read’ button is held down while the H-3311 is being powered up, the display will show
the current SDI-12 address. The SDI-12 address may be changed using the Adjust screw.
Turning the Adjust screw will change the address in the range of 0 to 9. When the Read button is
released the new SDI-12 address is saved and the display switches to the normal stage readout.
To change the SDI-12 address again, the power must be disconnected and the special power-up
sequence repeated.
Using the Adjust Knob to Change SDI-12 Address