74
GF 9950-10 Six Channel Transmitter
NOTE:
ORP solutions
made with quinhydrone
are very unstable and
may not read properly
once exposed to air for a
prolonged time.
These solutions must be disposed
of within an hour.
The solution can be used for
calibrating more than one sensor.
However, the solution must
remain free of debris and must
not be diluted by rinse water from
previous calibrations.
Acceptable ranges for the
readings are ± 80 mV
(i.e., 87 ± 80 mV).
Calibration Procedures - ORP
EasyCal Procedure - ORP (one-point calibration)
EasyCal is the fastest and simplest periodic ORP calibration method using any one of three speci
fi
c
buffer solutions. If the required buffers are not available, use MANUAL CAL and calibrate the
system using the STANDARD and SLOPE settings.
•
Saturate 50 mL of pH 4 (87 mV) or pH 7 (264 mV) buffers with 1/8 g quinhydrone.
•
Premixed Light's Solution (476 mV) can be used instead of pH buffers with quinhydrone.
•
Set sensor temperature in the CAL Mode before performing EasyCal for new
electrode installations.
1. From any VIEW screen, press
+
2. Press . (Press again to access CH1 if necessary)
1
EASY 87.0mV
87.0
86.2
AM/PM
SAVING
CH 1 ORP
EASY 87.0 mV
Place electrode tip in
saturated pH 7.0 buffer
pH 7.0 = 87 mV
To Calibrate:
To Accept:
Response:
PLACE SENSOR
START <ENTER>
IN BUFFER
ENTER
to accept
30s
Allow for stabilization
30 seconds
+
To exit menus and return to
9,(:SUHVVŸDQGź
buttons at the same time
