Portable pH/EC/TDS/Temperature Tester featuring CAL Check™

Portable pH/EC/TDS/Temperature Meter with CAL Check™ - HI9813-61

The HI9813-61 is a cost-effective, water-resistant, handheld device that assesses pH, conductivity (EC), total dissolved solids (TDS), and temperature using one probe. The HI9813-61 includes Hanna Instruments' CAL Check, enabling users to determine when the probe requires calibration or replacement. The operation of the meter is made easier with specific buttons for measurement modes shown on the LCD and dials for single-point calibration of pH and EC. The HI9813-61 has a variable EC to TDS conversion factor that automatically changes from 0.56 to 0.78 ppm = 1 µS/cm based on the actual EC reading. This range is suitable for agricultural, greenhouse and hydroponic applications. The temperature correction coefficient (β) is fixed at 2%/℃.

HI1285-61 polypropylene body amplified pH electrode with built-in EC/TDS and temperature sensors

The HI9813-61 is supplied with a polypropylene body pH/EC/TDS/temperature probe. The pH, EC, TDS, and temperature sensors are housed in a single body that connects to the meter with a DIN connector.

Amplified pH electrode

The pH electrode circuit has a built-in amplifier that will reduce the effects of electrical noise on the high impedance pH measurement. Examples of sources of electrical noise include motors, ballasts, and pump,s which are common in greenhouses.

Amperometric EC/TDS sensor

The EC/TDS readings are performed by an amperometric sensor. An alternating voltage is applied to the sensor and the amount of current that passes between the two stainless steel pins is dependent upon the amount of salts (fertilizer) present. A greater amount of salt present results in an increase in conductance.

Polypropylene body

The polypropylene body houses all the sensors in a single body design and is durable. The probe is gel-filled for maintenance-free operation. It does not have to be refilled periodically.

• 3 sensors in a single probe
• Pre-amplified pH electrode for resistance to electrical noise
• Gel-filled maintenance-free pH electrode

Water Resistant

CAL Check™

The HI9813-61 meter also offers the CAL Check™ feature that alerts the user to a problem with a pH electrode. This feature is important for customers who calibrate only to pH 7.0; if there is a fracture on the pH glass of the electrode, the pH meter will always display pH 7.0 regardless of the solution being measured. This can be disastrous for the person who calibrates at pH 7.0 and takes readings of samples with an expected pH of 7.0. The user will never be aware that there is a problem with the electrode. This can result in inaccurate pH measurements, which for a greenhouse can affect the growth of the plants. Placing the HI1285-61 pH/EC electrode in the HI50021 CAL Check™ solution helps users determine if the probe needs to be calibrated, cleaned or replaced. When the probe is placed in solution, the user presses the “Check” key. The meter runs CAL Check™ diagnostics and will display either “Probe is OK” or “Clean Probe and Calibrate”. If the reading is around pH 4.0 when the probe is placed in the solution, then the probe is broken and needs to be replaced.

Variable EC to TDS conversion factor

• Factor automatically adjusts from 0.56 to 0.78 based on actual EC readings
• Factor based on 442 curve for natural water

Automatic Temperature Compensation

• All readings are compensated for variations in temperature

Low Battery Indicator