3B Scientific Electrochemistry Kit - Manual (Page 6)

7
Meter
Front
<―――――― LCD display
Range display/
battery charge
――――――>
Off/range switch ―――――> <― Zero point adjuster (for pH )
Terminal sockets ―――――>
Rear
Mains power supply socket ―> <――――――― pH socket
Brief instructions for
voltage measureme
nts ―――>
<―
Brief instructions for
pH measurement
The meter is battery powered but can also be used with the power supply unit provided. The battery is
recharged completely when the device is used with the power supply and overcharging is impossible. The
power supply is plugged in to the bottom of the instrument.
In addition to voltage measurement, pH can also be measured with the meter.
1. Voltage
measurement
To perform voltage measurement, the meter is turned on via the range switch and is then initially configured
for the range 0 - 2V. If higher voltages are to be measured, the instrument can be reconfigured for 20 V by
using the range switch again. Electrodes are connected to the meter via 2 mm sockets (red/blue) in order to
take measurements.
2. pH
measurement
If pH is to be measured, the supplied combined pH electrode is connected to the pH socket at the bottom.
Set the range switch to “pH”. To calibrate the combined pH electrode, a buffer solution is employed (either
pH 4 or pH 9). This is a single-point calibration. After the pH electrode is immersed in the relevant buffer
solution, the zero point adjuster is altered until the displayed pH value matches that of the buffer solution. It
is now possible to conduct pH measurements. However, no further changes should be made to the
adjustment knobs.