AQUALABO ACTEON 5000 STACSENSE Calibration Procedure For Codeq Bodeq Toceq Parameters User Guide
- June 13, 2024
- AQUALABO
Table of Contents
Calibration guide
STACSENSE
ACTEON 5000- STACSENSE
ACTEON 5000-STACSENSE : Calibration
procedure for CODeq, BODeq, TOCeq
parameters
Reference Optical Signal
1.1. Generalities:
This is a measurement in clear, pollution-free water, without bubbles or
particles in suspension, at stabilized temperature.
1.2. Detailed Calibration of SAC254 with ACTEON5000:
Clear water: SAC254 Calibration (UV and GR Transmittance calibration)
Step| Modbus Name| Calibrated Parameter| Description|
Sensor conditions| Reference Input Value
1| Coeff 1| SAC254 (Param. 1)| UV User Clear Water Tx Comp Slope| Clear water|
0
2| Coeff 3| SAC254 (Param.1)| GR User Clear Water Tx Comp Slope| Clear water|
0
Step 1:
Zero adjustment of the UV light source (UV absorbance at 0, UV transmittance
at 1) Place the sensor under the following conditions: clear water stabilized
at temperature T, degassed.
The coefficient required to adjust the UV zero of the sensor is calculated
automatically by the sensor.
Step 2:
Zero adjustment of the green light source (Green absorbance at 0, Green
transmittance at 1) The coefficient needed to set the sensor’s Green zero is
calculated automatically by the sensor.
Equivalence COD, BOD or TOC:
SAC254 is a parameter for organic substances dissolved in water that absorb UV
radiation. It provides information on water contamination.
Despite the similarities, the parameters can not always be inter-converted.
However, a correlation can be established between the SAC254 parameter and
another parameter such as TOC or COD. The STACSENSE sensor then provides
equivalence data.
To obtain the correlation, it is recommended to measure the SAC for a few days
on samples of polluted water.
The conditions for obtaining useful data for efficient conversion represent
daily monitoring with periods of low and high loads, as in the case of urban
effluent. During these peak periods, you must:
- Read the SAC254 value delivered by the STACSENSE sensor (in Abs/m). (noted SAC254 STACSENSE),
- Take a representative fluid sample from the sensor location,
- Stabilize and store successive samples at 4°C until the time of analysis,
- Perform laboratory analyses of the COD parameter to be correlated; (noted laboratory COD in mg/L),
- Record the results in an excel file (SAC254 from STACSENSE, COD concentration from laboratory)
- Place the points obtained in a graph (vertical axis SAC254 STACSENSE, horizontal axis COD laboratory)
- Draw the linear regression line and display the corresponding equation & and the coefficient of determination (R2)
Example for COD adjustment:
| SAC254 STACSENSE (Abs/m)| COD labo (mg/l)
---|---|---
Sample 1| 0| 0
Sample 2| 1,75| 2
Sample 3| 2,35| 2,8
Sample 4| 2,72| 3
Sample 5| 2,68| 3,2
Sample 6| 9,52| 10,5
Sample 7| 10,95| 12
Sample 8| 16,42| 19,7
Sample 9| 22,73| 25
Sample 10| 21,92| 26,3
Sample 11| 22,05| 26,7
Sample 12| 25,4| 27,3
Sample 13| 26,22| 28
Sample 14| 30,79| 35,4
The linear regression line proposes a new relationship between the UV
absorption at 254 nm (CAS254) and the CODeq -> CODeq = 1.1279 * CAS254 +
0.0991.
Since the coefficient of determination R2 is close to 1 (R2= 0.9937), this
relationship is considered reliable.
The new slope is therefore equal to 1.1279 and the new offset to + 0.0991.
You have to replace the slope value 1.81 by 1.1279 and Offset value 0 by
0.0991 COD, BOD or TOC equivalences are calculated directly in the sensor
according to a first-degree law.
This pair of coefficients (offset and slope) is specific to each parameter.
ACTEON 5000 calibration menu. Example for CODeq parameter In order to access
the menu to adjust the Offset and the slope of each parameter from the SAC254
please follow the following path example for the slope):
The message “Communication pending” indicates that the calibration process is in progress.
Calibration guide STACSENSE
MAJ June 2023
AQUALABO
90 Rue du Professeur Paul Milliez
94500 CHAMPIGNY SUR MARNE
Tel.: +33 (0)1.55.09.10.10-
Fax : +33 (0)1.55.09.10.39
[email protected]
www.aqualabo.fr
Documents / Resources
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AQUALABO ACTEON 5000 STACSENSE Calibration Procedure For Codeq Bodeq Toceq
Parameters
[pdf] User Guide
ACTEON 5000 STACSENSE Calibration Procedure For Codeq Bodeq Toceq Parameters,
ACTEON 5000, STACSENSE Calibration Procedure For Codeq Bodeq Toceq Parameters,
Codeq Bodeq Toceq Parameters, Toceq Parameters
---|---
References
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