79
Section 7 Optional device installation
This section describes how to setup a rain gauge to the Sampler as well as how to
connect, program, and calibrate the optional water quality probes:
7.1 Rain gauge
An external “tipping bucket” rain gauge (2149) can be connected to the Rain Gauge
connector of the sampler (). The rain gauge 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.
• Rain Gauge
(section 7.1 on page 79
• Dissolved Oxygen Probe
(section 7.4 on page 85)
• pH Probe
(section 7.2 on page 80)
• Conductivity Probe
(section 7.5 on page 86)
• ORP Probe
(section 7.3 on page 83)
Figure 26 Rain gauge tipping bucket
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
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