APERA INSTRUMENTS / PC910 / AI5614

Two measurement channels, one organized water-testing bench

PC910 brings pH and conductivity together with separate sensor inputs and a simultaneous pH/conductivity display. The current kit pairs LabSen 211 and MP500 with the 2301T-F conductivity/temperature electrode, six starter standards, a flexible holder and USB record export.

Choose PC910 when the same bench routinely needs both acidity and ionic-conductivity measurements. Its dual-channel architecture is more than a menu that alternates between unrelated tests, but pH and ORP still share one input and require different electrodes.

Independent pH and conductivity connections

Connect LabSen 211 to pH/mV BNC and MP500 to its temperature RCA input. Connect 2301T-F to the separate conductivity BNC and conductivity-temperature RCA sockets. Both the current US page and exact 910 manual support simultaneous pH/conductivity measurement and display.

Conductivity with a defined conversion method

TDS and salinity are calculated from conductivity, not separate chemical assays. The adjustable TDS factor is 0.40 to 1.00, with 0.71 as the documented default. Reference temperature is adjustable from 15 to 30°C; temperature coefficient is adjustable from 0.00 to 10.00%/°C.

A probe set with different jobs

LabSen 211, AI3101, is a refillable glass pH electrode with a ceramic junction. MP500, AI1350, supplies its temperature reading. The POM-bodied 2301T-F, AI1305, has a K=1 conductivity cell, platinum-black sensing surface and its own temperature sensor.

Calibration standards are not custom points

The exact USB manual limits custom conductivity calibration to one point. Enter the standard value at the actual calibration temperature, and perform calibration and sample measurement at the same temperature; reference-temperature and temperature-coefficient adjustment do not apply in this mode.

Know what this configuration supplies.

Routine aqueous comparison

Useful for comparing compatible water samples, prepared solutions and rinse streams using pH and conductivity together. Record the temperature and conversion settings with each method; the same conductivity can produce different reported TDS when the factor changes.

Laboratory buffer preparation

The supplied pH electrode is explicitly TRIS-compatible. Concurrent conductivity can add context to solution preparation, but it does not identify the ions present or replace a validated concentration assay.

Very dilute, concentrated or difficult samples

The manual recommends K=0.1 cells below 20 µS/cm and K=10 above 100 mS/cm. Specialized pH electrodes are needed for demanding low-ionic-strength, viscous, solid or strongly acidic/alkaline samples. Do not extend the meter to 2000 mS/cm merely because an optional electrode can tolerate that range.

Calibrate each channel on its own terms

Arrange all sensing ends clear of the vessel bottom. Open LabSen 211’s refill plug for measurement and connect every temperature lead to the correct channel. Confirm ATC status, K=1 for the supplied conductivity cell, reference temperature and TDS factor before testing.

For standard pH calibration, select the correct buffer series and begin with its neutral buffer, normally pH 7.00 in the USA series. Follow with pH 4.00 and 10.01 as appropriate. Rinse between fresh buffer portions, wait for stability and review the resulting slope. A new LabSen 211 requires at least two points.

For conductivity, use clean portions of standards near the sample range. The kit supplies 84 µS/cm, 1413 µS/cm and 12.88 mS/cm; 111.8 mS/cm is the fourth recognized standard but is not included. Rinse with purified water, then a small portion of standard where practical. Remove trapped bubbles and wait for stability before confirming.

Place the probes in the sample and select the combined display when both results are needed. Keep samples representative and temperatures stable. pH compensation corrects electrode response; conductivity compensation uses the selected coefficient and reference temperature. Neither automatically corrects an unsuitable probe, contaminated sample or incorrect conversion factor.

The exact USB manual limits custom conductivity calibration to one point. Enter the standard value at the actual calibration temperature, and perform calibration and sample measurement at the same temperature; reference-temperature and temperature-coefficient adjustment do not apply in this mode.

Two electrodes require two storage routines

LabSen 211 must be stored in 3M KCl solution, AI1107, never in pure water. Refill its reference electrolyte when the level falls to half the electrode height, and close the blue plug after use. Rinse before and after each sample and replace contaminated storage solution.

For 2301T-F, the exact probe manual instead specifies distilled or deionized water in its storage cap. Rinse thoroughly and never rub the sensing surface. A gentle cleaning method appropriate to the deposit may be needed before recalibration. Do not transfer the pH electrode’s KCl storage instruction to this conductivity probe.

Keep BNC and RCA plugs clean and dry. Support the glass pH electrode independently rather than using it to stir. Power down before disconnecting USB or the adapter. A sturdy membrane or coating is not a guarantee against breakage, contamination or wear.

Read the display. Check the measurement mode.

Use the physical controls for measurement, calibration and the documented record functions. Check units, temperature, calibration indicators and the selected parameter before assigning a result to a sample. Screen values in photographs are illustrative, not sample results. The model-specific record and output workflow is explained below.

Follow the exact parameter-specific calibration procedure, using the required standard, solution or calibration atmosphere. 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 method context as well as the numbers

PC910 stores 200 data sets with numbering, date, time, value and temperature. Manual saving and timed logging are documented; in combined mode, one serial number contains two measurement values, so the manual warns that fewer than 200 paired records fit. Download and verify the records before clearing memory. Keep sample IDs and the relevant calibration method in the laboratory record.

The exact USB manual describes PC-Link 910, memory download, clock synchronization and Excel-document export. Live readings sent to the computer are not also saved in the meter, so confirm where a timed run is being recorded. The software illustration is a historical interface example, not a promise about a current operating system.

The US page now links Web PC-Link 9500 Series and names a PC-Link 9500 flash drive. The linked utility does not explicitly establish PC910 compatibility. Confirm exact model, firmware and operating-system support before relying on browser, Mac, CSV, JSON or LIMS workflows. Storage and calibration records do not by themselves establish GLP compliance.