Section 1 Product Overview; Section 2 Specifications - Hach PHC725 User Manual

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
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
2 Filling-hole plug
3 Protective tape and filling hole
4 Cable

Section 2 Specifications

Specifications are subject to change without notice.
Specifications
Probe type
pH range
pH accuracy
Reference type
Reference junction
Slope
Isopotential point
Details
Digital combination glass pH probe with refillable electrolyte and built-
in temperature sensor
0 to 14 pH
±0.01 pH
Red Rod (Ag/AgCl in protective tubes)
Annular porous ring
–59 mV/pH (85 to 115% at 25 °C (77 °F) per Nernstian theoretical
value)
6.00 pH
5 Probe soaker bottle holder
6 Electrode filling and storage solution
7 Reference junction
8 Glass bulb and temperature sensor
Figure 1.
English 3