Ph Meter
A pH meter
is a specific type of
voltmeter
or
ion meters
with high
impedance
of input channels. The high impedance is a necessary part of the equipment because of high resistance of
pH glass electrode
typically used with pH meters. In the present days almost all
ion meters
satisfy this requirement. Common pH meter has several inputs: for indicator(
ion-selective electrode
or
redox electrode
),
reference electrode
and temperature sensors like
thermoresistor
or
thermocouple
. pH scale of the device should be calibrated by several
pH buffer solutions
. It allows to correlate measured potential of indicator electrode and
pH
scale.
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