Specifications

Section 4. Sensor Installation
4.11 TB4, TB4MM or CS700 Rain Gage
The rain gage should be mounted in a relatively level spot that is representative
of the surrounding area. The lip of the funnel should be horizontal and at least
30 inches above the ground. The ground surface around the rain gage should
be natural vegetation or gravel. Often the rain gage is mounted to a CM300-
series pole. The pole can be embedded directly in a concrete pad. The CM300
pole can also be supported via j-bolts or legs.
1. Mount the rain gage to either the CM240 (Figure 4.11-1) or a user
supplied bracket. Remove the rain gage funnel from the base by removing
the three screws and lifting upward. Adjust the three nuts on the CM240
bracket to level the rain gage. On user supplied brackets, shims or
washers can be used to level the rain gage. A bubble level is mounted on
the TB4, TB4MM, or CS700 base to facilitate leveling.
2. Remove the rubber shipping band and cardboard packing securing the
tipping bucket assembly. Tip the bucket several times to insure the tipping
mechanism is moving freely.
3. Replace the housing assembly and tighten the three screws to secure the
housing to the base.
56”
24”
8”
FIGURE 4.11-1. TB4 or TB4MM Mounted onto a CM310 Pole via the
CM240 Mount
4-10