Bút đo TDS Hanna HI 98301

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Bút đo TDS - Tổng chất rắn hòa tan Hanna HI 98301

Hãng sản xuất: Hanna

Model: HI98301

Giá: Liên hệ 0977.459.400

DiST®1 TDS Tester (ppm) - HI98301

The HI98301 DiST®1 TDS tester is a rugged and reliable pocket-sized tester that offers quick and accurate readings. The HI98301 DiST®1 has a 0.5 conversion factor that is used for drinking water, water conditioning, reverse osmosis, wastewater, laboratories, aquaculture, and aquarium applications. This meter features graphite electrodes to reduce polarization effects and an exposed temperature probe for fast response when compensating for temperature changes. Manual calibration is performed to a single point.

Exposed temperature sensor

Low range TDS 0 to 1999 ppm

0.5 EC to TDS conversion factor

Single point manual calibration


The HI98301 features an amperometric graphite electrode that provides better repeatability in measurements since the electrode does not oxidize. An amperometric measurement of TDS is based on Ohm’s Law, I = V/R, where R depends on the distance between two pins and their surface. Oxidation changes both the distance and surface, which will affect accuracy. The DiSTs non-oxidizing graphite pins are able to provide an optimal surface for accurate, dependable results. When calibration is needed, simply submerge the electrode tip into calibration solution and adjust the trimmer on the side of the tester.

TDS (total dissolved solids), is a method used to determine solid content in a solution. To determine TDS, the solution whose volume is known is evaporated and the residue weighed. A conductivity measurement is commonly used to estimate TDS (Total Dissolved Solids) based on the assumption the solids are predominantly ionic in nature and the relationship between the dissolved ions and conductivity is known. TDS uses units of mg/L (ppm), or g/L. On some meters, the user can input the TDS factor for the conversion. On more basic units the factor is automatically set to 0.50.

TDS = EC @ 25oC x factor

For example: 100 μS/cm conductivity is a TDS of  50 ppm when the factor is 0.5.


Features at-a-glance:

One-point calibration

  • Calibrate with 1382 ppm TDS solution using a screwdriver

Exposed Temperature Probe

  • Fast response to changes in sample temperature

Automatic Temperature Compensation (ATC)

  • Samples automatically compensated for temperature variations

Graphite electrode

  • Reduced polarization effects


TDS Range 1999 ppm (mg/L)
TDS Resolution 1 ppm (mg/L)
TDS Accuracy ±2% F.S.
Calibration manual, one point
Temperature Compensation automatic from 0 to 50°C (32 to 122°F)
TDS Conversion Factor 0.5
Battery Type/Life 1.5V (4) / approximately 200 hours of continuous use
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions 175 x 41 x 23 mm (6.9 x 1.6 x 0.9’’)
Weight 78 g (2.7 oz.)
Ordering Information HI98301 (DiST®1) is supplied with protective cap, screwdriver, batteries and instructions.