Hanna Instruments HI9811-5 User Manual

11
The TDS value in aqueous solutions is directly proportional to the con-
ductivity. The ratio between the two parameters depends on the solution.
HI9811-5 model has a fixed conversion factor set to 0.5. This means
that 1 µS/cm is equal to 0.5 mg/L of TDS.
Accessories needed:
• Use HI70031 (1413 µS/cm) EC calibration solution or HI70032
(1382 ppm, or mg/L) TDS calibration solution.
Note: The conversion between EC and TDS is made by a built-in circuit,
hence it is requested to calibrate the meter only in EC or TDS
range. The other range is thus automatically calibrated.
PROCEDURE
• Pour approximately 4 cm (1½”) of a conductivity calibration solution
(e.g. HI70031) into a beaker. If possible, use plastic beaker to
minimize any EMC interference.
• Immerse the probe in the solution.
• Wait for a couple of minutes for thermal equilibrium to be reached.
• Tap the probe on the bottom, then shake it lightly while rotating
to make sure no air bubbles remain trapped inside the probe.
• Press the µS/cm (or mg/L) key.
• Turn the EC/TDS calibration knob until the display shows the EC or
TDS reading at 25 °C.
EC/TDS CALIBRATION
EC/TDS CONVERSION FACTOR

Hanna Instruments HI9811-5 Specifications

General

Range	0.0 to 14.0 pH 0 to 6000 µS/cm 0 to 3000 mg/L (ppm) 0.0 to 70.0 °C
Typical EMC Deviation	±0.1 pH ±2% f.s. µS/cm ±2% f.s. mg/L (ppm) ±0.5 °C
Conversion Factor	0.5
pH Calibration	Manual, 1-point through offset trimmer
EC/TDS Calibration	Manual, 1-point through slope trimmer
EC/TDS Temperature Compensation	Automatic from 0 to 70 °C (32 to 158 °F) with b=2%/°C
Resolution	0.1 pH 10 µS/cm 10 mg/L (ppm) 0.1 °C
Accuracy (@ 20 °C/68 °F)	±0.1 pH ±2% f.s. µS/cm ±2% f.s. mg/L (ppm) ±0.5 °C
Probe (included)	HI1285-5
Battery Type	1 x 9V alkaline
Battery Life	Approx. 450 hours of continuous use
Environment	0 to 50 °C (32 to 122 °F) 100% RH

Weight and Dimensions

Dimensions	145 x 80 x 36 mm (5.7 x 3.1 x 1.4”)
Weight	230 g (8.1 oz.)