APERA INSTRUMENTS / PH700-PW / AI5015

Low-ion water deserves a different reference junction.

The PH700-PW pairs a fixed bench station with the refillable LabSen 803 pH/temperature electrode. Its low-resistance membrane and movable sleeve junction address the difficult electrical conditions of pure water, where a rushed reading can undermine a careful test.

Choose AI5015 for suitable distilled, deionized, RO and other low-ionic-strength water samples. This is a sample-specific electrode choice, not a conductivity meter or a certificate of water purity. The method, handling and exposure to air remain part of the measurement.

A junction with adjustable flow

The movable sleeve lets reference electrolyte flow into the sample through an adjustable contact. Low-ion water requires adequate outflow; follow the electrode instructions for adjustment and recalibrate afterward. The sleeve is a serviceable part, not a promise that maintenance disappears.

A membrane selected for low-ion water

The L-type glass membrane has a stated resistance below 50 MΩ. Together with the silver-ion-trap reference, it is designed for this demanding water application. Sampling and air exposure still affect results.

Temperature at the same sensing assembly

The included 803 combines pH and an NTC 30 kΩ temperature sensor. Connect both leads for automatic compensation. Its specified working range is pH 1-11 and 0-80°C; the meter’s wider display range does not extend the electrode’s limits.

Distilled and deionized water

Use clean sampling equipment and a defined low-ion measurement procedure.

RO water checks

Compare like-for-like samples with consistent temperature, handling and exposure to air.

Low-ionic-strength aqueous solutions

Assess compatibility and the actual method before treating a reading as a release criterion.

Protect the sample while the reading settles.

Prepare at least 250 mL of sample for the pure-water procedure in the PH700-PW manual. Calibrate with suitable fresh standards and follow the manual’s pH 4.00 conditioning and subsequent rinsing sequence. Probe size does not establish micro-volume capability.

The exact kit procedure gives a typical stabilization time of 2-5 minutes. Wait for a genuinely stable reading rather than recording at a fixed countdown. Limit air exposure before and during measurement, using a covered arrangement where practical; carbon dioxide can change low-buffering water while it sits.

Keep collection, temperature and exposure conditions consistent between tests. Do not add salts just to make an unmodified-water reading behave, or adjust the result until it reaches pH 7. Additions change the sample and belong only in a separately validated method. No covered vessel is supplied.

Refill the reference. Preserve the hydrated tip.

Open the blue fill-hole stopper for calibration and measurement, then close it for storage. The reference is refillable with 3M KCl. The electrode instructions call for replenishment when the level falls to half the electrode height; use the exact manual for handling and sleeve service.

Rinse between standards and samples without rubbing the glass membrane. If deposits remain, use contaminant-appropriate manufacturer cleaning guidance, followed by the required conditioning and recalibration. Check response and calibration behavior, not just the displayed decimal.

Store the sensing tip and junction in the tightly closed vial with the specified 3M KCl solution. Distilled, DI and RO water are useful for rinsing, not storage. Keep connectors clean and dry. A storage vial is not a separately supplied retail bottle of refill or storage solution.

Bench electronics, local records.
Not a computer-export workflow.

PH700 supports 1-3 pH calibration points and 50 manually saved sets shared across pH/mV. The instrument display range is 0-14.00 pH with selectable 0.01/0.1 pH resolution and stated ±0.01 pH ±1 digit accuracy; these do not establish unrestricted probe/matrix accuracy.

M+ saves a stable result and RM recalls it. No documented USB/PC export, automatic interval recording, date/time field or certified audit trail is promised. Optional ORP needs a separate appropriate ORP electrode; the supplied pH electrode in mV mode gives its pH signal, not ORP.

Make the connector and temperature arrangement explicit.

Use this exact kit’s configuration and sensor guidance. Mechanical connector fit alone does not establish complete electrical, temperature or sample compatibility. The micro-volume configuration differs from the integrated-temperature kits.

Signal processing is one part of the method.

This manufacturer electronics illustration refers to the PH700 instrument. Appropriate electrode selection, calibration and sample handling still govern the result. It does not establish extra logging/export features or a separately tested performance guarantee.