Section 1 Product overview
The Intellical PHC725 pH probes are digital, combination electrodes that measure the pH of water
samples. The probe gives fast, stable, and accurate measurements in samples of low ionic strength
(LIS). The probes use the Red Rod technology and a saturated KCl electrolyte for high performance.
The probes are refillable and have a built-in temperature sensor. A 59-mL bottle of reference
electrolyte filling solution (saturated KCl solution) is supplied with the probe. Refer to Figure 1.
Note: Do not use the probe to measure the pH of organic solvents, emulsions or samples with many solids. For the
best accuracy, do not use the probe to measure the pH of very alkaline samples.
Figure 1 Probe overview
1 Probe soaker bottle with storage solution 5 Probe soaker bottle holder
2 Filling-hole plug 6 Electrode filling and storage solution
3 Protective tape and filling hole 7 Reference junction
4 Cable 8 Glass bulb and temperature sensor
Section 2 Specifications
Specifications are subject to change without notice.
Specifications Details
Probe type Digital combination glass pH probe with refillable electrolyte and built-
in temperature sensor
pH range 0 to 14 pH
pH accuracy ±0.01 pH
Reference type Red Rod (Ag/AgCl in protective tubes)
Reference junction Annular porous ring
Slope –59 mV/pH (85 to 115% at 25 °C (77 °F) per Nernstian theoretical
value)
Isopotential point 6.00 pH
English 3
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