Hanna HI98703 Portable Turbidity Meter, EPA Compliant

A portable nephelometric turbidimeter for drinking water and wastewater

The HI98703 is a high-accuracy portable turbidimeter that, according to Hanna, meets and exceeds the requirements of USEPA Method 180.1 for wastewater and Standard Method 2130 B for drinking water. It measures turbidity from 0.00 to 1000 NTU in three automatically selected ranges, with 0.01 NTU resolution below 10 NTU, and has an EPA-compliance reading mode that rounds the result to meet reporting requirements.

The optical system uses a tungsten filament lamp with a scattered-light detector at 90 degrees and a transmitted-light detector. Ratioing the two signals gives long-term stability, minimises stray light and colour interference, and compensates for lamp intensity drift, so frequent recalibration is not needed. Hanna rates stray light at below 0.02 NTU.

Technical specifications

Calibration, traceability and field data handling

Calibration can be performed at any time in one, two or three points against 15, 100 and 750 NTU standards, using the supplied or user-prepared solutions. Complete GLP functions keep the last calibration points, time and date available at a single touch. The user can pick normal, continuous or signal-averaging measurement, depending on the sample and the accuracy needed.

The meter is described as splash proof and arrives in a rigid carrying case. One battery set lasts at least 1500 measurements, and the display shows battery percentage and a low-battery warning. Hanna describes its Tag Identification System as a way to link measurements to sampling points for scientific and industrial work or for safety audits, and up to 200 measurements can be stored for download over RS232 or USB.

Choosing this meter and what ships with it

The HI98703 is a fit for treatment plants, distribution-network checks, filter-performance monitoring, raw-water intakes and effluent compliance work, where a portable turbidimeter follows the operator around the site. For lab-bench use with free and total chlorine in the same instrument, Hanna offers the HI83414 benchtop meter; for chlorine only, the HI97711 photometer.

Confirm the range your procedure needs, that NTU is the reporting unit required, and that the cuvette supply and standards are planned. Per the manual, the kit includes five sample cuvettes with caps, calibration cuvettes (HI98703-11), silicone oil for wiping the cuvettes, tissue, five tag holders with tags, four batteries, an AC adapter, instruction manual, quality certificate and a rigid carrying case.

How the Hanna HI98703 works

The HI98703 measures how cloudy a water sample is. A tungsten lamp sends a beam through a glass cuvette that holds the sample. Particles in the water scatter part of the light. A detector placed at 90 degrees reads the scattered light, and a second detector reads the light that passes straight through. The meter divides the two signals, so changes in lamp brightness or in water colour affect the result less. The result is shown in NTU, a standard unit of turbidity.

Where the Hanna HI98703 is used

• Drinking water treatment plants
• Wastewater and effluent checks
• Filter performance monitoring
• Environmental field sampling
• Laboratory water quality control

Selection checklist for the Hanna HI98703

• Turbidity range of 0 to 1000 NTU
• Method named in the reporting rules
• Need for EPA reading mode
• Calibration standards at 15, 100 and 750 NTU
• Battery or AC adapter power
• USB or RS232 data transfer
• Number of readings to log
• Portable kit and carrying case

Installation, commissioning and maintenance notes for the HI98703

Place the meter on a level surface away from strong light. Calibrate with the standards before use, using one, two or three points. Fill the cuvette with a clean, bubble-free sample, wipe the glass dry and insert it in the same direction each time. Replace scratched cuvettes and keep the optics free of dust.

Requesting a quotation for the Hanna HI98703

Please send the sample type, the range, the method, the accessories and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

HI98703 ranges and resolution

Three ranges are selected automatically. Resolution is 0.01 NTU to 9.99 NTU, 0.1 NTU to 99.9 NTU and 1 NTU above.

HI98703 accuracy

Accuracy is plus or minus 2 percent of reading plus 0.02 NTU. Stray light is below 0.02 NTU.

HI98703 memory and interface

The log holds 200 records. Data goes out over RS232 or USB.

HI98703 power and size

It runs on four AA batteries or an adapter and weighs 512 g. Operating range is 0 to 50 degrees C.

Measurement records for the HI98703

Record the sample point, the date, the calibration points and the reading.

Choosing the right HI98703 workflow

Choose normal, continuous or averaging mode from how steady the sample is.

HI98703 calibration standards

Calibration uses 15, 100 and 750 NTU standards, in one, two or three points.

HI98703 optical system

A tungsten lamp lasts over 100,000 readings, and a silicon photocell reads the light.

HI98703 GLP functions

The last calibration points, time and date can be recalled with one touch.

Documents and quotation

The instruction manual is attached. For other analytical instruments, browse Portable Test and Measurement, or see the Hach 2100Q portable turbidimeter. Send the model code and quantity through the RFQ form for availability and delivery details.