Xylem H-340 - Manual (Page 8)

1-2 H-340 User manual
H-340
Figure 1 Bucket tip mechanism sensitivity
1.3 Installation
Install the H-340 in an open location where it will not be in the rain shadow of trees or buildings.
A rooftop location helps prevent vandalism and the accumulation of leaves and debris. Bolt or
screw the 3-mounting feet to the structure to prevent upset in high winds. Adjust the three self-
leveling screws until the “bulls eye” level is centered.
1.4 Factory Calibration
The H-340 is calibrated in the factory with an apparatus which provides a constant 4in/hour flow
rate. The water exiting from the bottom of the rain gauge is captured in a precision graduated
cylinder. After 100 bucket tips or more have occurred, the flow is stopped and the volume in the
graduated cylinder is measured. The procedure is as follows: