Manual Coefficient; Calibration Log - ABB Aztec ATS430 Operating Instructions Manual

6.4.7 Manual coefficient

This calibration mode enables the user to enter directly the
coefficient that relates the turbidity of the sample to its
suspended solids content. The sensor uses the following
equation to calculate suspended solids content from turbidity
(see Fig. A.2, page 27):
SS = T/a
Where:
SS is the suspended solids content in the required units
(mg/l or ppm),
T is the turbidity in NTU
a is the coefficient.
If a set of data points of turbidity and suspended solids, the
coefficient can be calculated by plotting the suspended solids
(y-axis) against turbidity (x-axis) and fitting a straight line with
an intercept of 0. The calibration coefficient is the slope from
the linear fit of the data.
1. To enter a coefficient, select Manual Coefficient from the
Calibration Type screen and press the
Next prompt).
Suspended Solids
Calibration Type
Manual Coefficient
Next
2. Press the key (below the Edit prompt) to enter the value
of the coefficient and press the
prompt) when complete.
Suspended Solids
Manual Slope
Next
3. The Calibration Complete screen is displayed. Press the
key (below the Next prompt) to return
to the main menu.
The calibration is now complete.
22 OI/ATS430–EN Rev. H | Aztec ATS430 | Turbidity sensor
key (below the
Edit
key (below the OK
0.0000
Edit

6.5 Calibration log

The calibration log stored in the sensor holds a record of the last
15 calibration operations undertaken on the sensor. To view the
calibration log in the transmitter, logs must be enabled first.
Refer to the AWT440 transmitter manual (OI/AWT440-EN) for
details of how to enable logs.
Once logs are enabled, a calibration log page exists for each of
the sensors connected to the transmitter. To access the
calibration log, press the View key on the transmitter keypad
(the first calibration log is displayed):
Calib. Log S1
No. Event
01 Slope Low
02
1.01 /0 NTU
03
Cal Aborted
04
Verification
05
Verification
Fig. 6.3 Calibration log for Sensor 1, showing the result of different
calibration and verification operations
Use the group key in the keypad to cycle through the calibration
logs for each of the sensors. The log shows the result of the last
15 calibration operations undertaken. The result can be:
— Calibration aborted
user) part of the way through
— Calibration failed
the calibration failure
— Verification successful
— Verification failed
— Calibration successful
calibration parameters
Each entry displays the date and time the operation was
performed. Note that the date and time are taken from the
transmitter. To ensure the date and time stored in the log are
accurate, ensure the date and time set in the transmitter are
correct.
2016-02-12
09:45:40
Date Time
2016-02-12 09:42:32
2016-02-12 09:40:33
2016-02-12 09:39:16
2016-02-12 09:37:59
2016-02-12 09:36:13
CAL
: if calibration is stopped (by the
: the log entry displays the reason for
: if the sensor passes verification
: if the sensor failed verification
: the log entry displays the new