Hanna HI8733 Multi-Range Portable EC Meter 0-199.9 mS/cm

Hanna HI8733 multi-range portable conductivity meter

The Hanna HI8733 is an analogue-knob portable conductivity meter with four ranges from 0.0 to 199.9 mS/cm, covering everything from low-conductivity process water to seawater and brine. It is supplied with the HI76302W conductivity probe and a calibration sachet. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.

The HI8733 shares its instruction manual with the three-range HI8734 TDS meter and the related HI8633; the part number identifies the EC version with the widest span.

HI8733 technical specifications

How the HI8733 works

The probe applies an alternating signal across its electrodes and the meter measures the current that flows through the sample, which is proportional to the number of dissolved ions. Because conductivity rises with temperature, the internal temperature sensor of the HI76302W adjusts the reading to 25 °C using a beta coefficient that the user can set between 0 and 2.5 % per degree.

Calibration is manual: with the probe in the HI70030 12880 µS/cm standard, the operator turns the EC knob until the display matches the standard. The four range switch positions allow a single instrument to span ultrapure to seawater-class conductivity.

Where HI8733 fits: sensors, accessories and related models

The HI76302W is the supplied probe, with a DIN connector and a 1 m cable. Calibration standards and storage solutions are separate consumables; the 12880 µS/cm sachet included is a good match for brackish and high-conductivity work, while lower ranges benefit from additional standards.

The family comparison shows how the HI8733 differs from the HI8734 TDS model that uses the same case design.

HI8733 family comparison

Choose HI8733 when the specification asks for conductivity in µS/cm or mS/cm. Choose HI8734 when the specification asks for TDS in mg/L or g/L with a 0.5 conversion factor.

Selection and ordering checklist for HI8733

• Confirm EC is the required parameter and that the four ranges cover the expected values
• Quote extra calibration solutions to suit each range
• Decide on a spare HI76302W probe
• Plan for two 9 V alkaline batteries
• Check whether a TDS reading (HI8734) is actually what the procedure needs

Installation, calibration and maintenance of HI8733

Rinse the probe with deionised water and then with the sample before calibration, and immerse it fully so that the holes near the sensing rings are covered. Select the suitable range, calibrate at one point with the EC knob, and tap the probe lightly to dislodge bubbles.

After use, rinse and store the probe dry or in the protective cap. If readings become unstable, clean the electrodes gently with a soft brush or the cleaning solution, then recalibrate.

Because calibration is a knob adjustment rather than a software routine, users should recalibrate at the start of every shift and whenever the range selection changes. Record the standard value and temperature used for each calibration so that audits can see the reference.

For repeatable comparisons between sites, keep the same compensation coefficient and record the reading temperature alongside the conductivity value.

Because the display range is selected by the operator, a common mistake is reading a low value on a high range and losing resolution. Start on the highest range when the conductivity is unknown and step down until the reading is in the upper half of the scale. Also check the supplied standard against the range you will use, since a 12880 µS/cm calibration point is not ideal for readings of a few µS/cm, where an additional low standard improves accuracy.

Typical applications of HI8733 in Oman and the GCC

Typical uses in Oman are desalination feed, permeate and brine conductivity spot checks, cooling-tower and boiler blowdown control, irrigation and aquaculture water screening, and wastewater process monitoring. The 199.9 mS/cm top range handles seawater and concentrated brine without dilution.

The rugged analogue-knob design is popular with maintenance crews who want a simple instrument that can be calibrated in the field without menus.

Information to send with an RFQ for HI8733

• Quantity and need for spare probes
• Calibration standards required for each range
• Expected conductivity range and application
• Delivery location and lead time
• Project or tender reference

Storage, handling and spares for the Hanna HI8733

Store the Hanna HI8733 in its case in a clean, dry place. Keep probes, electrodes and reagents as described in the user manual, as many of them need a storage solution or have a limited shelf life. In the GCC climate, keep reagents away from heat and direct sun and check expiry dates before use.

• Calibrate the instrument with fresh standards at the interval your procedure requires.
• Rinse probes and sample cells after each use and inspect them for scratches or deposits.
• Keep spare consumables, such as reagents, standards, cuvettes and electrode solutions, in stock.
• Record calibration results so that drift or probe ageing can be seen early.

When you order the Hanna HI8733, list the consumables and standards you need in the same RFQ, so the instrument can be used from the day it arrives.

Documents and quotation

The instruction manual for the HI8733 is attached on this page for specifications, calibration procedures and maintenance steps. The same document covers the HI8734.

Send the part number HI8733, the quantity and your delivery location and we will reply with availability and a quotation.