accumet AB330 Conductivity Meter 27
5.4 Calculating
Temperature Coefficients
To determine the temperature coefficient of your sample
solution, use this formula:
𝑡𝑡𝑐𝑐
= 100 ×
𝐶𝐶
𝑇𝑇2
− 𝐶𝐶
𝑇𝑇1
𝐶𝐶
𝑇𝑇1
(
𝑇𝑇
2
−
25)
− 𝐶𝐶
𝑇𝑇2
(
𝑇𝑇
1
−
25)
Where:
tc = Temperature coefficient
25 = 25ºC
C
T1
= Conductivity at Temperature 1
C
T2
= Conductivity at Temperature 2
T
1
= Temperature 1
T
2
= Temperature 2
Note: A controlled temperature water bath is ideal for this
procedure.
Immerse the conductivity electrode into a sample
solution and adjust the temperature coefficient to
zero (no compensation). Refer to the
Wait for 5 minutes. Record T
1
and C
T1
(conductivity at T
1
).
Condition the sample solution and conductivity
electrode to a temperature (T
2
) that is about 5 ºC
to 10 ºC different from T
1
, and record the
conductivity reading C
T2
.
Note: Record your results for future reference. Ideally T
1
and T
2
should bracket your measurement temperature and
should not differ by more than 5 ºC.
Calculate the temperature coefficient of your
solution according to the formula shown above.
Enter the calculated temperature coefficient into
the meter.
The calculated temperature coefficient will now be applied
to all the meter readings.
5.5 Data Viewing
Store up to 500 data points in the meter memory. Use the
item in the meter Setup Menu to view the data
log points, active conductivity calibration log, active TDS
calibration log, active salinity calibration log and active
temperature calibration log.
The data log shows the most recent data log point first.
The meter will save up to 500 data log points and then
automatically overwrite the oldest data log point with the
newest data log point when the limit is reached. Each data
log point is saved with its associated date and time stamp.
To view the time stamp with seconds included, the data
log must be exported to a computer or printer.
The conductivity calibration log and TDS calibration log
shows each calibration point and the calculated calibration
factor value. Two, three, four and five point calibrations will
display the average calibration factor value and then the
appropriate number of individual calibration factor values.
The salinity calibration log shows the calibration point and
the calculated calibration factor value. The temperature
calibration log shows the temperature and offset value.
Each calibration log is saved with its associated date and
time stamp. To view the time stamp with seconds
included, the calibration log must be exported to a
computer or printer.
Note: If desired, when in the View Logs item in the meter
Setup Menu, press the “Log/Export” key to export the
individual data log point or calibration log being viewed.
5.6 Data Exporting
Export data from the meter to a computer or printer. Use
the
item in the meter Setup Menu to set
the export type as computer or printer. If computer is
selected, logs are exported in CSV format. If printer is
selected, logs are exported in list format. Meter serial
communication protocol:
Computer Setting
Printer Setting
Baud Rate : 9600 bps
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: None
Baud Rate : 9600 bps
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: None
5.6.1 Remote Commands
Remote commands allow the meter to be interfaced with
computer software like LIMs and HyperTerminal. The
remote engine receives input from the serial port and
processes it. Commands sent to the remote interface will
be in the form of “OPCODE <OPERAND> CR”.
•
Only one command can be executed at a time. A
new command cannot be issued until the previous
command is done and prompt is given, shown as
the greater than symbol (“>”) followed by a space.
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