Hanna HI8424 Portable pH/mV Meter with Temperature Probe

Hanna HI8424 portable pH/mV meter with temperature compensation

The Hanna HI8424 is a handheld pH and mV meter with automatic temperature compensation, built for plant technicians who need laboratory-style resolution of 0.01 pH away from the bench. It reads pH from -2.00 to 16.00, mV in two ranges and temperature from -20.0 to 120.0 °C. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.

The HI8424 is supplied as a ready-to-use kit with an HI1230B pH electrode, an HI7662 stainless-steel temperature probe, buffer and cleaning sachets, a protective case and batteries, so a single part number covers everything needed for a first measurement.

HI8424 technical specifications

How the HI8424 works

A glass pH electrode generates a millivolt signal that changes with the hydrogen-ion activity of the sample. The meter measures that signal against the reference, applies the slope and offset found during calibration, and corrects for the Nernst temperature effect using the stainless-steel temperature probe.

Calibration is automatic: the meter recognises the memorised buffers 4.01, 7.01 and 10.01, accepts one or two points, and in mV mode it can also be used for ORP or ion-selective electrode work thanks to the BNC input. The wide -2.00 to 16.00 pH window allows strongly acidic or caustic process liquors to be read.

Where HI8424 fits: sensors, accessories and related models

The meter is paired with the HI1230B PEI-body pH electrode on a 1 m cable with BNC connector, and the HI7662 stainless-steel temperature probe on a 1 m cable. Consumables are the HI70004, HI70007 and HI70010 buffers, HI700601 cleaning sachets and storage solution; for process liquors with different chemistry, other Hanna electrodes can be fitted through the BNC connector.

The next table places the HI8424 beside the benchtop HI6221 so you can choose between portable and laboratory use.

HI8424 family comparison

The HI8424 suits routine plant checks and field verification; the HI6221 benchtop meter suits laboratories that need up to 0.001 pH resolution, five-point calibration and a larger display.

Selection and ordering checklist for HI8424

• Confirm the sample chemistry suits the supplied HI1230B electrode, or quote an alternative electrode
• Decide whether extra buffers (4.01, 7.01, 10.01) and cleaning solution should be added
• Check the need for ORP or ion-selective work, which would use the mV mode
• Plan a spare 9 V Ni-MH battery and charger if used continuously
• Specify whether the 1 m cable length is adequate

Installation, calibration and maintenance of HI8424

Rinse the electrode and calibrate at one or two points before each shift, starting with pH 7.01 and then 4.01 or 10.01 depending on the expected sample range. Condition new or dry electrodes in storage solution, and clean with HI700601 sachets if the response slows.

Keep the temperature probe in the same sample as the electrode so that compensation reflects the actual liquid temperature. Do not store the electrode dry, and recharge the Ni-MH battery after prolonged storage.

For documentation, record the buffer lot numbers and calibration time in your own log, and replace the electrode when the slope can no longer be calibrated within the acceptable range. A glass electrode that reads slowly in a cleaned and conditioned state has usually reached the end of its life.

The case is intended to protect the meter in the field, but keep it away from solvents and from direct sun when parked in a vehicle in summer.

When ordering for a site with several instruments, standardise on the same electrode model and buffer lots so that readings from different meters can be compared. Keep the protective case closed between uses, label each meter with its calibration date, and schedule electrode replacement before the slope degrades, because a failing electrode wastes more time than a spare costs. For critical compliance samples, repeat the reading with a freshly calibrated meter and note both values in the log.

Typical applications of HI8424 in Oman and the GCC

Typical Oman uses include process-water and effluent pH checks at refineries and petrochemical plants, boiler and cooling-water treatment control, desalination chemical-dosing verification, and laboratory spot checks. The wide pH window helps with acid cleaning and caustic neutralisation streams.

Because the meter is portable and battery powered, one unit can be shared between several treatment skids and checked against the benchtop reading during routine audits.

Information to send with an RFQ for HI8424

• Quantity and need for spare electrodes or temperature probes
• Buffer and cleaning solution quantities
• Sample type and temperature range
• Delivery location and lead time
• Project or tender reference

Documents and quotation

The instruction manual for the HI8424 is attached on this page for specifications, calibration procedures and maintenance steps.

Send the part number HI8424, the quantity and your delivery location and we will reply with availability and a quotation.