Hach 900 MAX Manual De Usuario

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pH Probe
8990options.fm
Section 5
5.1.1 Rain Gauge Programming
1.
From the Main Menu select 
OPTIONS>ADVANCED OPTIONS>DATALOG.
2.
Highlight
 Select Inputs 
using the 
UP
 and 
DOWN
 keys and press 
SELECT
.
Note: When logging is enabled, an 
arrow will point to the logged 
channel. 
3.
Highlight Rainfall using the 
UP
 and 
DOWN
 keys and press 
SELECT
.
4.
Press the 
CHANGE CHOICE
 key to cycle between Logged and Not 
Logged, then press 
ACCEPT
.
5.
Enter a logging interval using the numeric keypad, then press 
ACCEPT.
 
Valid logging intervals are shown on the status bar along the bottom edge 
of the display. 
6.
Select Rainfall Units (in. or cm).
7.
Select another channel to configure, or press 
RETURN
 to back up one 
step. Press the 
MAIN MENU
 key to return to the Main Menu. 
5.2 pH Probe 
The pH probes are shipped with a wetting cap that covers the probe tip. 
Remove the cap by turning it counter-clockwise and gently easing it off. Keep 
this cap for long-term probe storage. Rinse the probe tip with distilled water.
Store the probe in a pH 4.0 buffer (Cat. No. 2104) for both overnight and long 
term storage. Never store a probe in distilled or deionized water because this 
will deplete the probe filling solution.
5.2.1 pH Probe Connection
This connector is for installing the pH or ORP pre-amp interface junction box 
or a stand-alone temperature sensor. The pH probe is attached to a terminal 
strip in the junction box. The stand-alone temperature probe plugs directly into 
the receptacle on the case.
The pre-amplifier junction box is provided to allow for fast, easy replacement 
of the pH probe. 
Since the pH reading needs to compensate for temperature variation, a 
temperature sensor is built into every pH electrode. The pH probe consists of 
five wires, three for the pH probe and two for the temperature sensor. 
Stray electrical currents are sometimes found in wastewater stream. These 
stray electrical currents can affect the pH readings. In the case of stray 
electrical currents, a grounded pH probe is required. Se
Table 8 pH Connector Pin Assignments (J3)
Pin
Signal Description
Wire Color
A
+5  V  dc
White
B
ground
Blue
C
reference
Yellow
D
pH/ORP
Black
E
-5 V dc
Red
F
RTD
Green