Rosemount 2081 pH, Instruction Manual

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13
2.4 Two-Point Calibration
Sensor should still be in the first buffer solution.
The sensor is placed in a buffer solution and the buffer value
is entered into the 2081. The sensor is placed in a different
buffer solution and that value is entered into the 2081. The
2081 will calculate the new slope from these values.
2.4.1 Compare the 2081 pH reading to the buffer value
that the sensor is in. If the display doesn't read the buffer
value, then enter the buffer value into the 2081, using the
following directions. If display reading is correct, skip to
Section 2.4.3, step 5.
2.4.2 Access the “
buF1
” feature on the 2081:
1. Press both push buttons in; display will scroll through
menu selections
2. When display reads “
buF1
”; release the buttons; dis-
play reads last buffer value entered. Far right digit will
be flashing, indicating that you may enter data.
2.4.3 Enter the buffer pH value that the sensor is in:
1. Press button #2 to select digit position to modify.
Selected digit will be flashing. Holding the button in
will cause selected position to shift to the left, then
back around again.
2. Release button when the desired digit is flashing.
3. Press button #1 to change digit's value. Holding the
button in will cause the selected digit to increase in
value, then back around again.
4. Release the button when the desired digit value is dis-
played.
5. Press both buttons in, briefly, to enter the new value into
memory. The 2081 will default to the pH reading. The
2081's pH reading will not change until the “
buF2
” value
is entered into memory. at the end of Section 2.4.5.
To 2081
pH Sensor
Buffer #1
(i.e., 4 pH)
Push Buttons
(side-view)
2081 Display
buF1
buF1
2081 Display
Scrolling
OUT
IN
➡
➡
➛
>
>
➡
2081 Display
0
0
.
.
00
00
2081 Display
1
1
.
.
00
00
1
0
IN
> >
2081 Display
4
4
.
.
00
00
2081 Display
3
3
.
.
95
95
4
>
2081 Display
3
3
.
.
95
95
=
Buffer #1
4.00 pH
?
>
>
➡
2081 Display
00
00
.
.
0
0
2081 Display
0
0
.
.
0
0
0
0
0
2081 Display
0
0
.
.
0
0
0
00
0
IN
> >
1
2
1
2
MODEL 2081 pH SECTION 2.0
QUICK START-UP PROCEDURE