Hach SOLITAX sc Manual Del Usuario página 8

Calibration
4.6.3 Calibration for Suspended Solids
Suspended solids calibration requires calibration to the actual sample. This optimizes the
compensation for the particle size and shape typical at a measuring site. It is best
performed by mounting the sensor as usual for normal measurement, and then grab
samples collected and evaluated by laboratory methods. While a single point calibration is
usually sufficient to provide accuracy, the SOLITAX does offer the ability to calibrate with
up to 5 calibration points.
1. From the Main Menu, select Sensor setup and press confirm.
2. Select the appropriate sensor if more than one is attached and confirm.
3. Select Calibration and press confirm.
4. Select Settings and confirm.
5. Select the number of points desired for calibration (the unit with linearly interpolate
6. Mount the sensor as is during normal operation. Alternatively, place the sensor in the
7. Select Sensor measurement and record the reading.
8. Immediately take a grab sample. Determine the total suspended solids using a
9. Calculate the new factor. Refer to
10. Select Factor and press confirm. The corrected measurement should be displayed.
4.6.3.1 For Single Point (Factor) Calibration
Calculate the new factor:
For example, if a sample measures 2.3 g/L using the SS sensor and the gravimetric value
was 2.0 g/L, the new factor would be calculated as follows:
4.6.3.2 Multi-point Calibration
1. Repeat steps
2. From the Settings menu, select the appropriate calibration point menu.
3. Enter the pairs of values for each reading, the target value being the laboratory
8
values between calibration points). Select Factor for a single point calibration.
calibration cylinder (or a container with dark, non-reflective walls) 2 inches of
clearance from the probe face with the probe face submerged by 1 inch or more.
gravimetric method such as Method 2540 D in Standards Methods for the
Examination of Water and WasteWater.
Refer section 4.6.3.2 on page 8
Determined gravimetric value
New Factor =
measured value
2.0 g/L
New Factor = = 0.87
2.3 g/L
6–8 in section 4.6.3 on page 8
measurements.
determined value, and the actual value being the reading that the SOLITAX produced
in step 5. The pairs should be entered in order from lowest values to highest.
section 4.6.3.1 for single point (Factor) calibration.
for multiple point calibrations.
at different times to obtain different
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