Hanna HI93703-11 Portable ISO 7027 Turbidity Meter

Hanna HI93703-11 portable ISO 7027 turbidity meter with data logging

The Hanna HI93703-11 is a microprocessor-based portable turbidity meter designed to the ISO 7027 standard, using an infrared LED and a 90 degree detector. It reads 0.00 to 1000 FTU (equal to NTU) in two autoranging scales and stores readings with a real-time clock. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.

The suffix -11 identifies the version supplied in a rugged carrying case with a glass cuvette, batteries and instructions. Calibration standards are separate items.

HI93703-11 technical specifications

How the HI93703-11 works

The meter passes infrared light through the sample vial and a detector at 90 degrees measures the light scattered by particles. The microprocessor converts the scatter into FTU. Because the unit follows ISO 7027, the readings are in FTU, which the manual states is identical to NTU.

The manual also provides a conversion table to the older Jackson turbidity unit (JTU) and to silica units (mg/L SiO₂) for users who must compare with historical records. Calibration standards can be AMCO-AEPA-1 style stable standards or freshly made formazine, and the manual notes the stable standards can be reused and last up to six months if free from contamination.

Where HI93703-11 fits: sensors, accessories and related models

Accessories are ordered separately: turbidity calibration standards at 0, 10 and 500 FTU, additional glass cuvettes with caps, silicone oil and cuvette cleaning solution. A positive-locking cell holder keeps the cuvette in the same position, and the keypad is water-resistant and can be wiped clean.

The HI93414 listed below is the EPA-style tungsten-lamp model that also measures chlorine; the HI93703-11 is the infrared ISO 7027 model.

HI93703-11 family comparison

Choose the HI93703-11 where the specification calls for ISO 7027 and infrared measurement. Choose the HI93414 where EPA-style tungsten measurement and combined chlorine testing are wanted.

Selection and ordering checklist for HI93703-11

• Confirm the specification: ISO 7027 (FTU) or EPA 180.1 (NTU)
• Quote calibration standards (0, 10 and 500 FTU) with the meter
• Add spare cuvettes with caps and cleaning supplies
• Decide if PC connection and cable are needed
• Plan four AA alkaline batteries

Installation, calibration and maintenance of HI93703-11

Calibrate with 0, 10 and 500 FTU standards using clean, scratch-free cuvettes, indexed in the cell holder. Make sure there are no bubbles in the vial, wipe the glass with a lint-free cloth and apply a thin film of silicone oil if the manual recommends it for your cuvettes.

Keep the meter out of direct sun during measurement and avoid vibration. Store the cuvettes in the case, and recalibrate at the start of each measurement session.

Turbidity readings are sensitive to bubbles, dust and cuvette condition. Fill the vial gently, cap it, let bubbles rise, and take readings from the same cuvette orientation each time. Mix the sample by inversion rather than shaking, and measure promptly because settling particles lower the reading.

The real-time clock makes logged values traceable, which is useful when one operator visits several filtration points in a day.

For documented quality control, run a check standard of known turbidity, for example the 10 FTU standard, at the start and end of each session and note the readings. If the check drifts outside the stated accuracy of 0.5 FTU or 5 percent, clean the cuvette, inspect it for scratches, recalibrate and repeat the check. Always use the same cuvette for zero and for samples when high precision is needed, and mark its orientation. Because infrared measurement is less affected by sample colour than white-light methods, results from coloured effluent are more representative of particle content, but dissolved colour can still have a small effect.

Typical applications of HI93703-11 in Oman and the GCC

Typical Oman uses include potable-water filtration performance, filter backwash and clarifier control, desalination pre-treatment and reverse-osmosis feed turbidity, wastewater effluent checks and construction dewatering discharge screening.

The rugged case and AA batteries make the meter practical for visits to remote treatment sites where mains power is not available.

Information to send with an RFQ for HI93703-11

• Quantity and standards required (0, 10, 500 FTU)
• Spare cuvettes and cleaning accessories
• Whether PC cable and software are needed
• Delivery location and lead time
• Project or tender reference

Storage, handling and spares for the Hanna HI93703-11

Store the Hanna HI93703-11 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 HI93703-11, 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 HI93703-11 is attached on this page for specifications, calibration procedures and maintenance steps.

Send the part number HI93703-11, the quantity and your delivery location and we will reply with availability and a quotation.