ECOWITT HP1000SE PRO, Manual

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Finally, place the sensor package on top of the prepared mounting pipe. The
U-Bolts should be loose enough to allow this but loosen the nuts as
necessary. Once placed, hand tighten all four nuts, taking care to do so
evenly. Do not use a wrench yet!
Now you will need to align the whole package in the proper direction by
rotating it on top of the mounting pipe as needed. Locate the arrow labeled
“NORTH” that you will find on top of the connector tube of the sensor
package (item 6). You must rotate the whole sensor package until this arrow
points due north. To achieve proper alignment, it is helpful to use a compass
(many cell phones have a compass application). Once rotated in the correct
orientation, lightly tighten the bolts a little more (use a wrench) to prevent
further rotation.
Note:
In Southern hemisphere, it is not necessary to change the orientation to
SOUTH as its solar panel is a rounded type and it is orientation free for its
charging capability.
Make sure the mounting tube for the sensor package is installed vertically
(use a level at 90-degree offsets around the tube). Adjust the mounting pipe
as necessary. Next also make sure the mounting of the anemometer body on
the pipe is level. If it is not, wind direction and speed readings may not
operate correctly or accurately. Adjust the mounting assembly as necessary.
Make sure you check, and correct if necessary, the north orientation again,
as the final installation step, and now tighten the bolts with a wrench. Do not
over tighten, but make sure strong wind and/or rain cannot move the sensor
package.
4.2.3 Reset Button and Transmitter LED
In the event the sensor package is not transmitting, reset the sensor.
Using a bent-open paperclip, press and hold the RESET BUTTON (item 12)
to affect a reset: the LED turns on while the RESET button is depressed, and
you can now let go. The LED should then resume as normal, flashing
approximately once every 4.8 seconds.