Davis Instruments 7852, Installation Manual

Page: 5 / 16

Testing the Rain Collector II
5
If you install the metric adapter to your rain collector, first adjust the console to display
rainfall in millimeters and then change CAL to 0005. (To change CAL, press and hold the
RAIN button until CAL appears on the display. Consult the station manual, if necessary,
for further instructions.) Be aware that the console will revert to its default calibration
(i.e., inches) if it loses power.
Note: Make sure you display rainfall in the appropriate units of measure before changing CAL; otherwise you
will be setting the wrong calibration number. If, by mistake, you change CAL before switching to the
appropriate units, you can rectify the error by switching to the appropriate units and then entering the
appropriate CAL (for millimeters, 0005; for inches, 0100).
Once the console is calibrated for 0.01" (default) or 0.2 mm, you can switch the display
units as often as you like; the console accurately converts rainfall amounts regardless of
the type of rain collector you use.
Caution to Pre-1994 Station Owners
If you purchased a Monitor or Wizard station prior to 1994, it may be pre-calibrated for
an earlier model rain collector. See “Calibration of Older Model Weather Stations” on
page 9 for instructions.
Testing the Rain Collector II
Before installing the Rain Collector II, test the unit. If you are replacing a rain collector
you previously installed, make a note of the total rainfall amount displayed. You may
want to reenter this amount after you test the rain collector.
1. Turn the rain collector upside down and
remove the cone from the base by rotating
the base until the latches on the cone line up
with the latch openings in the base then
lifting the base away from the cone.
2. Carefully cut and remove the plastic tie
which holds the bucket in place during ship-
ping.
3. Attach the rain collector cable to the appro-
priate connector on the junction box.
4. Consult your station manual or system
installation manual.
5. Press the appropriate key on your console as
necessary to display daily rainfall.
6. Press UNITS if necessary to display rainfall
in the rain collector’s native unit of measure.
7. While watching the display on your console
to see if it changes, slowly tip the bucket until it drops to the opposite side. If the dis-
play does not change, you may be tipping the bucket too quickly. Try again, more
slowly this time.
Remove the Cone from the Base