Measurement With Ion-Selective Electrodes; Conductivity Parameter - XS Instruments 8+Serie Manual De Instrucciones

Important: make at least two calibration points, if
shows the error "Not enough calibrated points" and calibration is invalidated.
ATTENTION: Before proceeding with the calibration operations, carefully consult the safety data sheets of
the substances involved:
Standard calibration buffer solution.
•
• Storage solution for ISE electrodes.
• Filling solution for ISE electrodes.

Measurement with Ion-Selective Electrodes

•
• Access the Ion setup menu to verify the correctness of the calibration and the instrumental
parameters, Press
key.
Correctly connect the ISE sensor to pH/mV/ORP BNC, rinse with distilled water, dab gently and insert
•
it into the sample.
The display shows the measurement in mV until the stability is reached.
•
When the measure stabilizes, the mV measurement is replaced by the concentration of the analyte
•
with the unit of measurement chosen by the user.
Important: If the device is not calibrated, in measurement mode, only the mVs are displayed.
Note: If you are using as stability criteria countdown of seconds, to resume counting press

Conductivity Parameter

Cond8+, Cond80+, PC8+DHS, PC80+DHS
Connect the Conductivity probe to the BNC type connector marked in grey, while the temperature probe
must be connected to the RCA / CINCH Temp connector always on a grey background.
Conductivity is defined as the ability of the ions contained in a solution to conduct an electric current. This
parameter provides a quick and reliable indication of the number of ions present in a solution.
• ... how to get to the conductivity?
The first Ohm law enunciates the direct proportionality in a conductor between the current intensity (I) and
the applied electric potential difference (V) while the resistence (R) represents the constant of
proportionality. In particular: "V = R x I", consequently the resistence "R = V / I", where R = resistence (ohm),
V = voltage (volt), I = current (ampere). The reverse of resistence is defined as conductance (G) "G = 1 / R"
and it is express in Siemens (S). The measurement of resistance or conductance requires a measuring cell,
which consists in two poles of opposite charge. The reading depends on the geometry of the measuring cell,
which is described through the cell constant parameter "C = d/A" express in cm
in cm between the two electrodes and A their surface in cm
UM Serie 880 EN rev.2 30.07.2020
key to get back to in measurement mode and shift to key MEAS ION with
22
key is pressed after the first calibration the display
-1 where "d" is the distance
.
2
.
EN