4210 Flow Meter
Section 4 Optional Equipment
4-8
4.6 Tipping Bucket Rain
Gauge
A Tipping Bucket Rain Gauge is available from Isco for use with
4200 Series Flow Meters. The gauge connects to the flow meter
by a cable terminated in an M/S connector. This connector plugs
into the Remote Printer/Rain Gauge connector on the case. A
Y-connect cable is available that allows use of both the rain
gauge and a YSI 600 Multi-Parameter Sonde at the same time.
You can connect extra cable (user-supplied) between the rain
gauge and the factory-supplied cable as long as you do not exceed
a maximum total length of 1,000 feet. Use 18 AWG wire or larger.
Do not cut the M/S connector from the cable.
The rain gauge is factory-calibrated to provide a contact closure
to the flow meter for every hundredth of an inch (0.01") [or 0.1
mm] of rainfall. Software in the flow meter stores this infor-
mation in memory and prints the accumulated data as a text line
on the printer chart. It also allows the printout to be expressed in
metric.
You may, if you wish, provide a rain gauge of your own choice, but
to ensure compatibility with the flow meter's operating envi-
ronment, it must conform to the following specification:
• It must provide an isolated, dry contact closure.
• It must be a normally open contact configuration.
• It must close for 100 ms (–25 ms +150 ms) with less than
2 ms contact bounce.
• It must provide a contact closure for every 0.01" (or 0.1
mm) of rainfall
A cable assembly is available to connect a user-supplied rain
gauge to the flow meter. Further information about the rain
gauge is available from the factory or its manual.
Figure 4-2 Isco 674 Rain Gauge
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