4230 Flow Meter
Section 4 Optional Equipment
4-8
4.4 Tipping Bucket Rain
Gauge
A Tipping Bucket Rain Gauge is available from Isco for use with
4200 Series Flow Meters. The rain gauge connects to the flow
meter by a cable terminated in an M/S connector. This connector
plugs into the 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 information 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 specifications:
• 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.
Analog Output 1 Termina-
tions
Pin A (Red wire –)
Pin C (White wire +)
Analog Output 2 Termina-
tions
Pin D (Brown wire –)
Pin F (Blue wire +)
Analog Output 3 Termina-
tions
Pin E (Black wire –)
Pin B (Green wire +)
Note: If you must strip the cable further back to facilitate
wiring, you will expose an orange, yellow, and purple wire.
You may disregard these wires, as they are not connected
in this application.
Table 4-2 Multiple Analog Output Board: Technical
Specifications (each circuit) (Continued)
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