Xylem H-340SDI - Manual (Page 13)

H-340SDI
H-340SDI Introduction 1-7
Figure 2
1.10 Adjusting the Tipping Bucket Mechanism
Warning: DO NOT ADJUST THE BUCKET STOPS.
Adjusting the stop posts causes a false reading of equal amounts of water in each bucket. This is
due to the variation of distance the bucket center must travel after passing the bottom of the
funnel. Do not adjust the bucket stops in an attempt to balance the weight of the buckets. Instead,
the H-340SDI provides an adjustable screw parallel to the buckets by which the bucket weight
balance can be accomplished. This eliminates the need to adjust the stops and compensates for
any inequality of weight due to manufacture and assembly, and gives equal travel to each bucket
as the center passes the flow of water.
The counter weight underneath the bucket mechanism can be adjusted (up or down,) to set the
bucket volume (# tips/unit rainfall). See Figure 2. The up/down counter weight adjust
instructions in steps 1 and 2 may seem to be intuitively backwards however, realize the center of
gravity of the bucket and counterweight is above the pivot.
Counter Weight
Lock Nut #1
Bucket Stop
Do Not Adjust
2.062
Balance Screw
Set Screw