Orp Probe; Orp Probe Connection; Orp Programming - Hach Sigma 950 Instrument Manual

7.3 ORP Probe

7.3.1 ORP Probe Connection

7.3.2 ORP Programming

3. Enter the temperature of the first buffer solution using the numeric keypad. Press
to continue.
ACCEPT
4. Press the
CHANGE CHOICE
pH), then press
ACCEPT
5. Remove the probe from the first buffer solution, rinse it under distilled water and
place it into the second buffer solution (4, 7, or 10 pH, different from the first buffer
used). Press any key to continue.
6. Press
CHANGE CHOICE
to continue.
ACCEPT
A "pH Calibration Failed-Gain And/Or Offset Out of Range, Try Again" error message will
be displayed if the pH probe is damaged, cannot be calibrated, or if the buffer solutions
do not fall within an acceptable range.
Make an attempt at reading the second buffer solution after pressing a key. If this fails, it
is likely that you have a poor pH probe or poor buffer solutions. Try a new set of buffer
solutions. If that fails try a different pH probe.
Pin
A
B
C
D
E
F
Note: There is no temperature sensor on the ORP sensor.
The ORP probe consists of three wires: a clear wire, a black wire, and a red wire. The
pre-amp required interface is a 6-pin connector on one end and a junction box with
terminal strips on the other end (P/N 2078).
1. Attach the clear wire to either screw on the terminal strip labeled GLASS.
2. Attach the black wire to the REF screw on the other terminal strip.
3. Attach the red wire to the GND screw on the terminal strip.
1. From the Main Menu, select
2. Highlight Select Inputs using the
continue.
3. Highlight ORP using the
4. Press
CHANGE CHOICE
to continue.
ACCEPT
5. Enter a logging interval using the numeric keypad, then press
intervals are shown on the status bar along the bottom edge of the display.
to select the pH for the first buffer solution (4, 7, or 10
to continue.
to select the pH for the second buffer solution, then press
Table 18 ORP Connector Pin Assignments
OPTIONS>ADVANCED OPTIONS>DATALOG.
and
UP DOWN
and soft keys, then press
UP DOWN
to cycle between Logged and Not Logged, then press
Optional Device Installation
Signal Description
+5 V dc
ground
reference
pH/ORP
-5 V dc
RTD
soft keys and then press
to continue.
SELECT
. Valid logging
ACCEPT
to
SELECT
51