HI 98311 and HI 98312 Waterproof EC/TDS/Temperature Testers
This document serves as the instruction manual for the Hanna Instruments HI 98311 and HI 98312 waterproof EC/TDS and temperature meters. It details the preliminary examination of the device, functional descriptions, and safety recommendations for users. The meters feature automatic temperature compensation and include a unique stability indicator on the LCD display.
| Temperature Range | 0.0 to 60.0°C / 32.0 to 140.0°F |
|---|---|
| TDS Range (HI 98311) | 0 to 2000 ppm |
| TDS Range (HI 98312) | 0.00 to 10.00 ppt |
| Resolution | 0.1°C / 0.1°F |
| Battery Type | 4 x 1.5V |
| Dimensions | 163 x 40 x 26 mm |
| Weight | 100 g |
The instrument must be recalibrated at least once a month, whenever the probe is replaced, after testing aggressive chemicals, or where high accuracy is required.
If the battery level is low enough to cause erroneous readings, the meter shows “0%” and the Battery Error Prevention System (BEPS) will automatically turn the meter off.
Yes, the EC/TDS conversion factor (CONV) is selectable by the user, as well as the temperature compensation coefficient β (BETA).