Ph Calibration Options - Hach senslON+ MM 374 Manual De Instrucciones

4. Operation

4.6. pH calibration options

Automatic buffers recognition
Technical buffers
pH 2.00, 4.01, 7.00, 9.21 and 10.01 at 25˚C (77˚F).
Buffers DIN 19266
pH 1.679, 4.006, 6.865, 7.000, 9.180, 10.012 and 12.454.
User's buffers
Suitable when the two above mentioned options will not be
+
used. The sensION ™
MM 374
table pH/Temp. for the desired buffers. See System, page 19.
Calibration to X value
Manual re-adjustment of the measured pH at any value of the
scale. The pH readjustment is equivalent to calibration with only
one buffer.
10-04-2010 17:15
pH CALIBRATION
Channel 1
Technical buffers Calibration pH
Stability c: standard
...
Calibration type
Start calibration Cal. frequency
Channel 1
Display mV: No
Start calibration
Important note:
Once the calibration is
re-programmed, it will be
performed with the new
programming.
Note:
Select "Display mV"
for simultaneous dis-
play of pH and mV
during calibration.
Calibration pH
Stability c: standard
Calibration type
Cal. frequency
See Stability Crite-
Display mV: No
ria on page 13
Calibration data introduction
Manual introduction of calibration data for a previously cali-
brated electrode. For example in a calibration laboratory.
Theoretical calibration
Selecting "theoretical calibration" the calibration data of the elec-
trode in use are replaced by the theoretical values at 25˚C (77˚F).
This step is prior to obtaining a calibration certificate.
Calibration frequency
allows introducing the
Select between 0 h and 7 days. The instrument by default is
programmed for daily calibration and indicates the remaining
time to the new calibration.
Selecting 0 h automatically deactivates the re-calibration warning.
Stability criteria.
Rapid criterion (variation < 0.02 pH in 6 s).
Standard criterion (variation < 0.01 pH in 6 s).
Strict criterion (variation < 0.002 pH in 6 s).
It is highly recommended to apply the same stability criteria to
measure and calibrate.
Calibration pH CALIBRATING pH
Type of calibration
Technical buffers
Technical buffers
DIN 19266 buffers Use first buffer
User Buffers
Continue...
To a X value
Calibration pH CALIBRATING pH
Type of calibration
DIN 19266 buffers
Technical buffers
DIN 19266 buffers Use First Buffer
User Buffers
Continue...
To a X value
Calibration pH CALIBRATING pH
Type of calibration
User buffers
Technical buffers
DIN 19266 buffers Start calibration
No. Buffers:
User Buffers
Buffer 1
To a X value
See page 19.
Calibration pH CALIBRATING pH
Type of calibration
To a X value
Technical buffers
DIN 19266 buffers
Use standard
User Buffers
Continue...
To a X value
Calibration pH
Calibration pH
Introducing data
Type of calibration
Pot. asym.:
Data introduction
Slope: 59.16mV/pH
Theoretical cal.
Temperature: 25 °C
Save changes
The instrument goes to
MEASURE menu. The
introduced calibration
data will be used.
Calibration pH Calibration pH
Type of calibration Theoretical cal.
Data introduction Pot. asym.: 0 mV
Theoretical cal. Slope: 59.16mV/pH
Temperature: 25 °C
Continue...
Calibration pH
The instrument goes to the
Calibration frequency
option "CALIBRATE pH" and
Automatic warning.
it must be recalibrated.
1 day 00 hours
CALIBRATING pH
User buffers
1st buffer pH
1
Continue...
CALIBRATING pH
pH 3.08 25˚C
00:06
0 mV
The instrument goes
to MEASURE menu.
The theoretical cali-
bration will be used.
Start of calibration
with automatic
recognition of the
selected buffers.
CALIBRATING pH
Adjust value
+3.09 pH
The instrument
goes to Measure.
9