What is the measurement principal?

The detection principal of ATAGO salt meters (ES-421, PAL-ES2, PAL-ES3) is that of electric conductivity method which detects and converts electrolytes to NaCl concentration. Unlike titration (Mohr's) method,
1. No chemical is required.
2. No varied readings caused by user interpretation.
3. Fast measurement – results are displayed within 3 seconds.
The Mohr's method detects Chlorine and converts to NaCl concentration. The unit that is used for Mohr's method is g/100ml while PAL-ES2 and ES-421 use g/100g.

How is the unit calibrated?

Press the ZERO button while the sensor empty and completely clean. No chemical is necessary. Perform this zero-setting daily. When measurement values seem to be off, calibrate the unit with a standard saline solution. Content ATAGO for purchase.

Nacl Concentration (for calibration)
Parts# Part name Nacl Concentration Contents
RE-120250 NaCl Solution 2.50% AB250
for PAL-ES2,ES3 calibration
2.50 ± 0.05 (g/100g) Approx. 5ml
RE-120284 NaCl Solution 2.50% AB284
for ES-421 calibration
2.84 ± 0.05 (g/100g) Approx. 5ml

Can tap water be used for sample dilution?

Always use distilled water whenever possible.
If tap water is used, make sure that the water reads "0 (zero)" in advance.

Do other electrolytes besides salt affect the readings?

The amount of other electrolytes found in food is negligible, usually less than 1%.

Can the instrument measure the non-sodium total dissolved?

Non-sodium total dissolved solids = Brix - (salinity % × 1.18).
A refractometer with the Brix scale is required. The salinity % is multiplied by 1.18 to be converted into a Brix value.

Does the Mohr method and ATAGO salt meters use the same measurement principles?

The Mohr method, also known as a silver nitrate titration method, utilizes the characteristic of silver nitrate that reacts with chloride ions to measure the salinity %. The ATAGO salt meters employ the electric conductivity method. Both methods measure the salinity but operate on different measurement principles. However, by creating a conversion table between the two testing methods, correlation between the set of results can be seen.

Any tips to use a salt meter for a long time?

1. Please clean the sensor section before use. Prepare use NaCl solution to clean. You can make NaCl solution by put 2 spoonfuls of salt in one cup of water (100 - 120ml). Put this NaCl solution in the sensor section and wipe with the tissue paper. The sensor section get active by wiping NaCl solution instead of water.
2 When you use the salt meter for the first time in days, please wipe the sensor with NaCl solution a few times.
3.Please make sure to do the zero setting after you wipe the sensor section.
4.After you use the salt meter, please clean the sensor section with tap water or distilled water. When you measure any sample contains oil, please wipe with ethyl alcohol. Please do not use neutral detergent.
5.Please store the salt meter in a dry place.