The HI9811-51 is a pH/EC/TDS meter for agriculture, greenhouse and hydroponics applications.
These meters feature a large LCD which displays either pH, EC, TDS or temperature readings along with tutorial instructions. The pH readings are displayed with a 0.1 resolution and an accuracy of +/-0.1 pH while the EC and TDS readings are displayed with a 10 mS/cm and 10 ppm (mg/L) resolution and 2% full scale accuracy. The temperature correction coeffcient (?) is fixed at 2 %/°C and allows for automatic temperature compensated measurements of EC and TDS. These meters are calibrated manually to a single point with the use of two trimmers. pH is calibrated to pH 7.01 while EC/TDS is calibrated to either 1.41 mS/cm (1413 µS/cm) or 1500 ppm. The LCD screen has battery life indicator as well as on-screen tutorial messages.
No probe changes are required when switching your measured parameter between pH, conductivity and TDS. These multiparameter meters reduce the number of instruments required for daily water quality analysis.
The supplied probe on all models feature a polypropylene body, amplified pH electrode with a built-in EC/TDS and temperature sensors. The amplifier for the pH electrode prevents interference from humidity and electrical noise from common sources including from motors, ballasts or pumps.
| Specification Name | Detail |
|---|---|
| sku | HI9811-51 |
| pH Range | 0.0 to 14.0 pH |
| pH Resolution | 0.1 pH |
| pH Accuracy (@25°C/77°F) | ±0.1 pH |
| pH Calibration | manual, 1-point through offset trimmer |
| Temperature Range | 0.0 to 70.0 °C |
| Temperature Resolution | 0.1°C |
| Temperature Accuracy (@25°C/77°F) | ±0.5°C |
| Temperature Calibration | Automatic, from 0 to 70°C with ß=2% / °C |
| EC Range | 0 to 6000 µS/cm |
| EC Resolution | 10 µS/cm |
| EC Accuracy (@25°C/77°F) | ±2% F.S. |
| EC Calibration | manual, 1-point through slope trimmer |
| TDS Range | 0 to 3000 ppm (mg/L) |
| TDS Resolution | 10 ppm (mg/L) |
| TDS Accuracy (@25°C/77°F) | ±2% F.S. |
| TDS Conversion Factor | 0.5 ppm (mg/L) = 1 µS/cm |
| TDS Calibration | manual, 1-point through slope trimmer |
| Power Supply | 9V / approximately 450 hours of continuous use |
| Environment | 0 to 50°C (32 to 122°F); RH max 100% |
| Dimensions | 145 x 80 x 36 mm (5.7 x 3.1 x 1.4”) |
| Weight | 230 g (8.1 oz.) |
| Ordering Information | HI9811-51 is supplied with HI1285-51 multiparameter probe, HI70007 pH 7.01 calibration solution sachet, HI70032 1382 ppm (mg/L) calibration solution sachet, HI70031 1413 µS/cm calibration solution sachet, HI700661 electrode cleaning solution sachets (2), 9v battery (1), instructions and rugged carrying case. |
| Warranty | 2 years |
| Recommended Probe | HI1285-51 polypropylene body, pre-amplified multiparameter probe with internal temperature sensor, 8-pin DIN connector and 1 m (3.3’) cable |
