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75
GF 9950-10 Six Channel Transmitter
Manual Calibration Procedure - ORP
Requires prepared buffers and a prepared quinhydrone solution:
Saturate 50 mL of pH 4 and 7 buffers with 1/8 g quinhydrone.
(System calibration is possible with two known ORP solutions, but use a buffer
close to your own process value).
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.
Single-point calibration
sets STANDARD only.
GF recommends a
two-point calibration to
set SLOPE in addition
to STANDARD.
Quick Manual Calibration
Procedures:
1-Point Calibration
:
1. Set solution standard.
2-Point Calibration
:
1. Set solution standard.
2. Set solution slope.
Acceptable ranges for the
readings are ± 80 mV
(i.e., 87 ± 80 mV).
Calibration Procedures - ORP
+
x4
Display returns to
VIEW Mode
CH1 ORP
EASYCAL ->
CH1 ORP
AT INSTRUMENT
CAL
CH1 ORP
HOLD OUTPUTS
OFF
CH 2 ORP ->
CH1 ORP ->
1.
To Set Standard:
To Change Reading:
CH1 ORP
ORP STANDARD ->
SET
CH1 ORP
ORP STANDARD ->
SET
RAW 73.25 mV
76.13
+76.1
3
AM/PM
30s
Allow for stabilization
30 seconds to several minutes
ENTER CODE
_ _ _ _
CH1 ORP
RAW 13.25 mV
7.13
CH1 ORP
ORP STANDARD ->
CH 1 pH ->
SAVING
ENTER
to accept
2.
CH1 ORP
ORP SLOPE ->
SET
CH1 ORP
ORP SLOPE ->
SET
To Set Slope:
To Change Reading:
13.25
257.49
+07.1
3
AM/PM
30s
Allow for stabilization
30 seconds to
several minutes
CH1 ORP
ORP SLOPE ->
CH 1 pH ->
SAVING
CH1 ORP
RAW 13.25 mV
7.13
ENTER
to accept
3.
To Set Calibration Date:
CH1 ORP
04-20-2017 XX
100
LAST CAL
.00
CH1 ORP
05-15-2017 XX
100
LAST CAL
.00
To Change Reading:
CH1 ORP
05-15-2017 XX
CH 1 pH ->
SAVING
CH1 ORP
RESET ORP CAL ->
SET
04-20-2017 XX
LAST CAL
0
4-20-2017 XX
ENTER
to accept
4.
700.0
mV
120.0
mV
00.00
00.00
00.00
00.00
Place electrode tip in
saturated pH 7.0 buffer.
pH 7.0 = 87 mV
Place electrode tip in
saturated pH buffer two
pH units different than
standard. pH 4.0 = 264 mV