YOKOGAWA TB830D, Руководство пользователя, Страница: 54 / 85

< 7. Calibration >
7-3
IM 12E01B30-02EN 1st Edition : Mar. 08, 2023-00
7.2 Turbidity standards
The turbidity standards are used as reference for adjusting a zero or span point of a turbidity
detector.
n
Zero Standard
l
Zero Turbidity Standard Solution
Filtered tap water is used as a zero turbidity standard solution for TB830D turbidity detector.
For zero calibration, it’s filterd through a 1 μm filter.
l
Zero Turbidity Filter
The specifications of the zero turbidity filter that can be purchased from Yokogawa is as follows.
Item 1 µm Zero Turbidity Filter 0.2 µm Zero Turbidity Filter
Part number K9411UA K9726EF
Piping connection Rc1/2 Rc1/2
Maximum pressure 500 kPa 500 kPa
Cartridge material Polypropylene Polypropylene
Filter size 1 µm 0.2 µm
Accessory Air vent plug Air vent plug
n
Turbidity Standards
l
Turbidity Standard Solution
A formazin, Kaolin, PSL is used as a turbidity standard solution for TB830D turbidity detector.
l
Check Tool
A check tool used for slope calibration or the sensitivity checks is supplied with the turbidity
detector.
The check tool has been pre-calibrated for span point using a standard solution above at the
factory before shipment. Normally the check tool is used as span.
Drain the water inside the FLow cell and wipe the edge of the Flow cell before setting the check tool.
NOTE
The turbidity value indicated on the check tool has been determined for the turbidity detector of
interest based on zero and span calibrations at the factory; it is a unique value, specific to the
turbidity detector.
When using multiple turbidity meters, there is no compatibility between the check tools of each
turbidity meter.
Be sure to use the check tool that comes with each turbidity meter.
Also, special care should be taken when handling a check tool. Scratches or dirt on the surface of
a check tool may affect the turbidity value.