Section 5 Optional Device Installation; Rain Gauge - Hach 900 MAX Instrument Manual

Section 5

5.1 Rain Gauge

Figure 21 Rain Gauge Tipping Bucket
Pin
A
B
C
D
E
F
8990options.fm
Optional Device Installation
This section describes how to setup a rain gauge to the Sampler as well as
how to connect, program, calibrate, and maintain the optional water
quality probes:
• Rain Gauge (section 5.1 on
page 69
• pH Probe
(section 5.2 on page
• ORP Probe
(section 5.3 on page
An external "tipping bucket" rain gauge (Cat. No. 2149) can be connected to
the Rain Gauge connector of the sampler
provides a dry contact closure to the sampler.
As rainfall collects in the 20 cm (8 in.) diameter funnel, it is directed into one
side of a "tipping bucket" assembly. As each bucket fills, it causes the bucket
assembly to tip and empty out into the bottom of the rain gauge. Each tip of
the bucket causes a single contact closure to the rain gauge and sends a
short 12 V dc pulse into pin C of the Rain Gauge connector. Each pulse (tip)
represents 0.025 cm (0.01 in.) of rain.
Table 7 Rain Gauge Base Board Connections (J5)
• Dissolved Oxygen Probe
(section 5.4 on page
• Conductivity Probe
70) (section 5.5 on page
72)
(Figure 21). The rain gauge
Signal Description
+12 V dc source output
not used
+12 V dc pulse input
not used
not used
not used
Optional Device Installation
74)
76)
Page 69