NovaLynx Corporation
255-704-B
Page 16
April 2021
10
EVAPORATION GAUGE CALIBRATION CHECKUP
The 255-704-B Evaporation Logger can be used to check the accuracy of the potentiometer as part of a
regular maintenance cycle. At a minimum, the operation of the potentiometer should be checked at
the beginning of a monitoring season.
The following procedure applies to the logger when it is
calibrated to the generic factory settings.
Disassembly
1.
Remove the four screws holding the evaporation gauge cover and lift the cover off.
2.
Remove the chain from the sprocket by lifting the counterweight. Drape the counterweight and
chain over the outside of the gauge. Do not attempt to remove the float.
3.
Rotate the sprocket by hand to verify that it turns freely 360° without binding. It should spin freely
when given a small push.
255-704-B EVAPORATION
DATA LOGGER
USB Connector
DWG 890-0060-04
White Stripe
Testing with Evaporation Data Logger
Setup
1.
Note that one ridge on the sprocket face has been painted with a white stripe. The other ridges are
not painted and are spaced 60° around the face of the sprocket. The back side of the sprocket has
similar ridges but none are painted.
2.
Verify that the logger is displaying the position of the sprocket. Rotate the sprocket a little and note
the change in reading. Remember, the display updates only once every 15 seconds. Be patient.
