horiba OCMA-500, Инструкция по эксплуатации, Страница: 41 / 141

Preparation
21
Zero liquid for calibration
Prepare pure solvent S-316, the same as is used for measurement.
Span liquid for calibration
Use pure solvent S-316, the same as is used for measurement, to prepare the span liquid for
calibration.

Using B-heavy oil
Use B-heavy oil (specific gravity 0.895 at 20°C) to prepare span liquid for OCMA-500. When
you know the oil type to be measured, you can also use that oil type for the calibration oil.

Items required

Scale

Glass container with a lid (screw-top bottle is recommended)

Measuring flask

Solvent S-316 (optional)

B-heavy oil (specific gravity 0.895 at 20°C) or calibration oil (when the oil type to be
measured is known)
Note

Clean the glass utensils to be used with pure solvent S-316, and let them air dry completely. If the
utensils cannot be dried completely, purge them 3 times or 4 times using solvent S-316.

It is difficult to measure B-heavy oil with a microsyringe because it has a high viscosity. Use a
suitably sized glass container with a lid (a screw-top bottle is recommended) for measurement.

Preparation method
Prepare the liquid so that it has a concentration of approximately twice the measured value of
the sample.
Tip
You can change the calibration value to be input as appropriate for the volume that is actually
measured.
1. Use a scale to accurately measure the B-heavy oil in a glass container (with lid) of
suitable size.
2. Transfer the B-heavy oil from the glass container to the measuring flask, while
cleaning with S-316.
3.
Fill the measuring flask to the graduation with solvent S-316.
4.
Insert the stopper into the measuring flask and mix the contents well.
Table 5 Example of span liquid preparation
Calibration value
(mg/L)
Concentration of
span liquid (mg/L)
Measuring flask
volume (mL)
B-heavy oil quantity
(mg)
200 400 250 100
50 100 100 10
20 40 250 10