The soil activity and conductivity of nutritive solutions, irrigation water, and saturated soil-paste are two important parameters for growers and horticulturists. With HI993310 it is possible to directly measure, in a quick and simple way, the soil activity in the ground as well as the conductivity of various solutions.
The portable HI993310 meter measures the soil conductivity in EC (mS/cm) as well as soil activity (g/L). These two measurement modes are made possible using the two supplied probes: HI76305 with stainless steel, conical tip for direct soil measurement and HI76304 for fertilizer enriched solutions. The two different scales can be selected through two keys on the front panel and two separate LEDs indicate which parameter is being tested. In addition, HI993310 is equipped with an alarm LED that illuminates if the soil is too dry or nutritive substances such as potassium or nitrogen are lacking.
Two Probes - The HI76305 is a stainless steel EC probe that features a conical tip and internal temperature sensor to allow for accurate, direct, and temperature compensated measurements of soil activity in g/L. The HI76304 is a durable, two-ring EC probe that features an internal temperature sensor to allow measurement in nutritive solutions, irrigation water, or soil slurries.
Two Measurement Modes - HI993310 offers two measurement modes: EC and soil activity. Users can easily switch between measurement modes with the simple press of a button. The “W” button on the meter face automatically switches to water conductivity measurement mode in units of mS/cm. The “S” button switches to soil activity measurement mode in units of g/L. EC measurements range from 0.00 to 19.99 mS/cm; soil activity measurements range from 0.00 to 1.00 g/L.
Automatic Temperature Compensation - Since temperature has such a dramatic effect on conductivity readings, having a meter that offers temperature compensated readings is invaluable. Both probes that come with the HI993310 feature a built-in temperature sensor that automatically accounts for the effects of temperature in the range of 0 to 50°C (32 to 122°F).
Temperature Compensation Coefficient - The temperature compensation coefficient, also known as β, is set at 2%/°C; this factor corrects the readings for EC and soil activity 2% for each degree Celsius change in the sample.
One-point Calibration - The HI993310 can be calibrated at one point in a standard calibration solution. The calibration trimmer located on the face of the meter is easily adjusted to the correct calibration standard.
LED Alarm - The meter provides for a LED alarm when measuring soil activity. If the LED lights up, the soil is too dry for a proper measurement or it lacks nutritive substances. If the alarm LED lights up again after users wet the soil and carry out the measurement again, the soil lacks nutritive elements and an accurate reading cannot be taken.
Auto Shut-off - Automatic shut-off after 2 minutes of non-use when the meter is in measurement mode. This prevents wastage of batteries in the event the meter is accidentally left on.
Battery Error Prevention System (BEPS) - The Battery Error Prevention System detects when the batteries become too weak to ensure reliable measurements.
EC Range 0.00 to 19.99 mS/cm EC Resolution 0.01 mS/cm EC Accuracy ±2% FS EC Calibration Manual, single-point through knob EC/TDS Temperature Compensation automatic from 0 to 50°C (32 to 122°F) with β=2%/°C typical
Soil Activity Range 0.00 to 1.00 g/L Soil Activity Resolution 0.01 g/L Soil Activity Accuracy ±2% FS
EC/TDS Probe HI76304 plastic body, ATC, conductivity probe with 1 m (3.3’) cable Soil Activity Probe HI76305 stainless steel conic tip, ATC probe for direct soil meas. with 1 m (3.3’) cable Automatic Shut-Off auto-off after 2 minutes of non-use Battery Type/Life 9V / approximately 100 hours of continuous use Environment 0 to 50°C (32 to 122°F); RH max 95% Dimensions 185 x 82 x 52 mm (7.3 x 3.2 x 2.0’’) Weight 275 g (9.7 oz) Ordering Information HI993310 is supplied with HI76304 conductivity probe, HI76305 direct soil conductivity probe, battery, instruction manual, and rugged carrying case.
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