APERA INSTRUMENTS / PC950 / AI5624

pH and conductivity together.
A practical, organized test bench.

The PC950 brings pH and conductivity onto one benchtop instrument, with a simultaneous pH/EC display and the 606 TestBench for probe positioning, solution organization and magnetic stirring. The kit supplies a LabSen 211 pH electrode, separate MP500 temperature probe and 2401T-F conductivity/temperature electrode, plus six calibration solutions.

For routine aqueous-sample comparisons where pH, conductivity and a repeatable preparation method matter more than research-grade display resolution. It is not a universal chemical-analysis system.

Read pH and EC together

The color display presents pH and conductivity concurrently, each with its own temperature and stability indication. Use the paired view to compare two aspects of one prepared sample. This documented mode is not a promise that every available parameter combination can be displayed together.

Know what the precision means

The meter offers 0.1 or 0.01-pH resolution, with specified pH accuracy of ±0.01 pH ±1 digit. Conductivity electronics are specified at ±1.0% full scale ±1 digit. Neither specification guarantees the same accuracy in every sample matrix.

Keep the bench under control

The 606 combines a flexible electrode holder, solution organizers and magnetic stirrer. Meter controls adjust and recall stirring speed. The stated 0 to 2300 rpm is a no-load rating; maximum stirring volume is 1000 mL, with performance dependent on vessel and liquid. It does not heat samples.

Know what this configuration supplies.

Water and process checks

Compare compatible water samples using consistent temperature, calibration and sampling procedures. The included K=1 conductivity cell is not a universal best-choice sensor for ultrapure water or highly concentrated solutions.

Aqueous formulation work

Track pH and conductivity during compatible aqueous formulation or dilution work. Stirring helps homogenize the sample, but does not automate dosing, titration or the decision that a reading is ready.

Teaching and laboratory routines

Use the paired display to teach the difference between acidity and ionic conduction. Conductivity-derived TDS and salinity are conversions, not direct identification of dissolved substances, pathogens or drinking-water safety.

Connect each channel.
Calibrate each measurement.

Connect LabSen 211 BNC to pH/mV and MP500 RCA to the pH temperature socket. Connect both 2401T-F leads to conductivity BNC and conductivity temperature RCA. MP500 and 2401T-F each use a 30 kΩ thermistor; one shared temperature lead is not the documented arrangement.

Select fresh buffers around the expected pH, beginning at 7.00 in the USA series. PC950 supports 1 to 3 standard pH points, or 1 to 2 user-defined points. Four EC standards are recognized, but only three are supplied. Rinse between solutions.

Open the pH refill plug during use. Immerse the sensing ends correctly, clear bubbles from the conductivity cavity and wait for stability. Choose suitable EC compensation and TDS settings. Temperature compensation does not eliminate every temperature-dependent change in sample chemistry.

Two electrodes.
Two different storage routines.

LabSen 211 is refillable. Maintain its reference with 3M KCl and keep its sensing end wet in 3M KCl storage solution. Close the refill plug after use. Distilled or deionized water is for rinsing, not long-term pH-electrode storage.

For 2401T-F, rinse carefully and refill its storage cap with distilled or deionized water as directed in its manual. Do not transfer the pH electrode's KCl-storage rule to the conductivity cell. Keep the platinum-black sensing surfaces free from abrasion.

Keep connectors dry and protect all glass parts from vessel walls and the stir bead. Remove deposits using the appropriate electrode instructions, then recalibrate. Strong acids, strong alkalis, HF, viscous liquids and nonaqueous samples require a separate probe-suitability review.

A stable reading is the start of the record.

Use the physical meter controls for measurement and calibration, then record or save a stable result. A held display and a stored record are different functions. Screen values in photographs are illustrative, not measurements of your sample.

Use calibration solutions and settings appropriate to the parameter and fitted electrode. Temperature compensation does not make different sample temperatures, preparation methods or chemistry equivalent. Follow the model-specific meter and electrode instructions before extending the method to a new sample.

Save the reading.
Manage the working record.

PC950 stores 200 value sets with manual or timed logging. A dual pH/EC save consumes two sets, so an all-dual session fits 100 paired save events by that counting rule, not 200 paired samples.

The verified legacy route is USB with PC-Link 950 and Excel export. The current product page links a newer Web PC-Link 9500 utility, but PC950 hardware compatibility remains unconfirmed. Do not plan a PC950 browser workflow without checking support for the actual instrument.

Set the clock before logging and transfer important records before clearing memory. Retain exported files under your own record-control procedure. This is not an immutable compliance trail or loss-proof archive; printer compatibility with PC950 has not been verified.