Data Harvest Smart Wireless 1110 Manual - Página 16

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Data Harvest Smart Wireless 1110 Manual
To calculate the pH electrode slope percentage
The ratio of the measured potentials to the difference of pH gives the slope of the straight line.
E
– E
2
1
Slope S =
[mV/pH]
pH
– pH
2
1
For example: pH buffer pH 4 and pH 7 are used. For buffer pH 4 the potential is 163 mV and in buffer
pH 7 its -10 mV.
163 – (-10)
173
Slope S =
=
7 – 4
At 25˚C the theoretical slope is 59.17 mV/ per pH unit. To calculate the pH electrode slope percentage
divide the mV potential being generated per pH unit by the theoretical number and multiply by 100
58 x 100 = 98% slope
59.17
Generally a slope between 90 to 105% is acceptable.

Buffers

Buffers are solutions that have constant pH values and the ability to resist changes in that pH value.
To make up your own solutions:
pH
Add
of
4.0
2 cm
3
0.1 mol dm
3
7.0
582 cm
0.1 mol dm
10.0
214 cm
3
0.1 mol dm

Limited warranty

For information about the terms of the product warranty, see the Data Harvest website at:
https://data-harvest.co.uk/warranty.
Damage to the pH sensitive glass bulb is not covered by warranty.
Note: Data Harvest products are designed for educational use and are not intended for use in
WEEE (Waste Electrical and Electronic Equipment) Legislation
Data Harvest Group Ltd is fully compliant with WEEE legislation and is pleased to
provide a disposal service for any of our products when their life expires. Simply return
them to us clearly identified as 'life expired' and we will dispose of them for you.
FCC Details
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation
=
58 [mV/pH]
3
to
-3
HCl
1000 cm
3
-3
3
NaOH
1000 cm
-3
NaOH
1000 cm
3
industrial, medical or commercial applications.
16
pH Adaptor & Electrode
of
0.1 mol dm
-3
potassium hydrogen phthalate
-3
0.1 mol dm
potassium dihydrogen phosphate
0.05 mol dm
-3
sodium bicarbonate
.