Eppendorf Top Buret M / H - Manual (Page 27)

27
Calibration and adjustment
Top Buret ™
English (EN)
6 Calibration and adjustment
6.1 Calibrating the Top Buret
The Top Buret has been calibrated with distilled or deionized water. You can
carry out a gravimetric test of the Top Buret error. The procedure is described in
detail in DIN EN ISO 8655.6.
You need the following auxiliary equipment:
• Distilled water
• Calibrated analytical balance
• Beaker
6.1.1 Measuring the testing volume
Prerequisites
• The device and auxiliary equipment must have the same temperature (20 °C –
25 °C, ±0.5 °C).
Proceed as follows:
1. Set up the calibrated analytical balance at a vibration and draft-free location.
2. Place a beaker on the balance.
3. With the Top Buret M, titrate 25 mL of distilled water into the beaker and
record the weight.
4. Repeat step 3 10 times.
5. With the Top Buret H, titrate 50 mL of distilled water into the beaker and
record the weight.
6. Repeat step 5 10 times.
6.1.2 Calculating the error
1. Calculate the volume of the water.
Density of water (ρ) at 16 °C – 21 °C = 0.998 g/mL
Density of water (ρ) at 22 °C – 25 °C = 0.997 g/mL
2. Calculate the average value of the volumes.
V = ρ
m
V = 1/n V
i
∑
n
i = 1