HI 9811-5: Portable pH/EC/TDS/Temperature Meter – Low Range EC & TDS
HI 9811-5 is a pH/EC/TDS waterproof meter designed for simplicity in taking pH, µS/cm, ppm (mg/L) and temperature measurements
Due to the built-in temperature sensor, conductivity readings are automatically compensated for temperature changes. The temperature coefficient is fixed at 2%/°C.
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 specially engineered HI 1285-5 pH/EC/TDS and temperature probe utilizes a fiber junction and gel electrolyte which provide a fast response and reduced contamination. This combination makes the HI 1285-5 particularly designed to withstand harsh environments such as fertilizer solutions.
Features: Water resistant, On-screen tutorial messages for calibration, Switch parameters at the touch of a button, Automatic Temperature Compensation for pH and conductivity, Simple calibration; Dials located on the front panel makes calibration quick and simple, even for non-technical users, BEPS (Battery Error Prevention System) alerts the user in the event that low battery power could adversely affect readings, Battery % displayed on startup, Fast response probe included.
Range: pH 0.0 to 14.0 pH
EC 0 to 6000 µS/cm
TDS 0 to 3000 mg/L (ppm)
Temperature 0 to 60°C
EC 10 µS/cm
TDS 10 mg/L
Accuracy: pH ±0.1 pH
EC ±2% F.S.
TDS ±2% F.S.
TDS Conversion Factor: 0.5 mg/L = 1 µS/cm
Calibration: manual at 1 point (all parameters except temperature)
Temperature Compensation: Automatic, 0 to 50°C with ß = 2%/°C (EC/TDS only)
Probe: HI 1285-5 polypropylene body, pre-amplified multiparameter probe with internal temperature sensor, 8-pin DIN connector and 1 m (3.3’ cable (included)
Battery Type / Life: 9V / approximately 150 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.)
pH is a measure of the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. Pure water has a pH very close to 7.
Total dissolved solids (TDS) is a measure of the combined content of all inorganic and organic substances contained in a liquid in molecular, ionized or micro-granular (colloidal sol) suspended form.
* We could really write a blog just on pH and TDS/EC, so given the popularity of this product we will be following up with a blog on that very subject. Stay tuned.
Hanna: Checker® pH Tester (HI 98103)
Hanna: Primo 2 – TDS Tester (with 1 mg/L EC resolution & 0.1 °C resolution)
*These other meters are also made by Hanna and are more common due to price. We typically carry the first two meter in addition to the multimeter featured in this article. The waterproof meters are available by order and have replaceable probes. Please call if you you are interested.