Section 1 Product overview
The Intellical PHC281 series pH probes are digital, combination electrodes that measure the pH of
water samples. The probes are refillable and have a built-in temperature sensor. The probes have
good performance in low ionic strength (LIS) samples (e.g., deionized, reverse osmosis, distilled) and
other clean waters (specific conductance less than 100 µS/cm to ultrapure). The open reference
junction lets the electrolyte flow at a high rate for optimum electrical connection with the sample. The
open reference junction does not become clogged with suspended solids if used in dirty applications.
A 59-mL bottle of 2.44 M KCl reference electrolyte filling solution is supplied with the probe. Refer to
.
Note: Do not use the probe for measurements in organic solvents.
Figure 1 Probe overview
1
Probe soaker bottle with storage solution
5
Cable
2
Glass bulb, reference junction and
temperature sensor
6
Probe soaker bottle holder
3
Filling-hole plug
7
Electrode filling and storage solution
4
Protective tape and filling hole
8
Dispensing cap
Section 2 Specifications
Specifications are subject to change without notice.
Specifications
Details
Probe type
Digital combination pH probe with refillable electrolyte and built-in
temperature sensor
pH range
0 to 14 pH
pH accuracy
±0.02 pH
Reference type
Ag/AgCl
Reference junction
Open
Slope
–59 mV/pH (90 to 110% at 25 °C (77 °F) per Nernstian theoretical
value)
Isopotential point
0 (±30) mV at 7.0 (±0.5) pH
Sodium (alkalinity) error
–0.6 pH at pH 12.6 in 1 M NaOH
English
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Содержание PHC281
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