83
Optional device installation
4.
Select the pH for the first buffer solution (4, 7, or 10 pH) using the
CHANGE CHOICE
key, then press
ACCEPT
to continue.
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.
Select the pH for the second buffer solution using the
CHANGE CHOICE
key, then
press
ACCEPT
to continue.
If the pH probe is damaged and cannot be calibrated or if the buffer solutions do not fall
within an acceptable range, an error message will be displayed as shown below.
Another attempt at reading the second buffer solution will be made after pressing a key. If
this fails, it is likely that you have a bad pH probe or bad buffer solutions. Try a new set of
buffer solutions and if that fails try a different pH probe.
7.3 ORP probe
The 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. 22834-49) for both overnight and long term
storage. Never store a probe in distilled or deionized water because this will deplete the
probe filling solution.
7.3.1 ORP probe connection
This connector is for installing the pH or ORP pre-amp interface junction box or a
stand-alone temperature sensor. The ORP probe is attached to a terminal strip in the
junction box.
The ORP probe consists of three wires; a pink, black, and red wire. There is no
temperature sensor on the ORP probe.
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.
11:00 AM 21 - APR - 01
ERROR MESSAGE
pH CALIBRATION FAILED-GAIN
AND/OR OFFSET OUT OF RANGE
TRY AGAIN
(PRESS ANY KEY TO CONTINUE)
Table 9 ORP 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
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
Q-Pulse Id VM373
Active 29/10/2013
Page 83 of 122
