Hach 900 MAX ユーザーズマニュアル

8990options.fm

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:

An external “tipping bucket” rain gauge (Cat. No. 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 (

Dissolved Oxygen Probe 
(

pH Probe
(

Conductivity Probe 
(

ORP Probe 
(

A

+12 V dc source output

B

not used

C

+12 V dc pulse input

D

not used

E

not used

F

not used