Casella CEL Tipping bucket rain gauge - Manual (Page 6)

4. PREPARATION FOR USE
Each instrument is delivered ready calibrated to indicate either 0.1 mm, 0.2
mm or 0.5 mm of rainfall each time the bucket tips. (The Environmental
Agency version is available only with 0.2 mm or 0.5 mm buckets.)
The heated versions require a 24 V AC source, which can be obtained from
an isolated and fully protected -TR26 Mains Transformer that must be
ordered separately. It is suggested that the transformer be installed in a hut
or some other weather proof enclosure that has mains power available.
It is also recommended that the rain gauge be installed in a location or
enclosed compound away from access by the general public.
Prepare a reasonably level site for the rain gauge paying due regard to the
following points:
¤
No object should be nearer than four times its own height from the
bucket.
¤
Do not locate the rain gauge in a hollow or on top of a hill.
¤
Tall buildings or belts of trees can cause turbulence and gusts
which can increase or decrease the rain collected.
¤
The surrounding soil should be capable of allowing the discharged
water to drain away freely.
Warning !
The septum ring has a sharp edge and should be
treated with care whenever handling the instrument.
4.1 Non-Heated Versions
4.1.1 Standard Single Output Non-Heated Version
1. Release the two catches securing the outer cover to the base and
then carefully lift off the cover.
2. Feed a suitable length of 2 A, 2-core cable, through the grommet.
3. Connect the instrument end of this cable to the terminal block
provided on the underside of the base unit for the output signal.
4. Connect the free end to the counting device, see Figure 3 and
Chapter 6.
Preparation
Page 6 of 16
Tipping Bucket Rain Gauges
User Manual