Portable pH/EC/TDS/Temperature meter
This meter features 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 0.01 ms/cm and 1ppm (mg/L) resolution and 2% full scale accuracy. The EC range of both meters is from 0.00 to 4.00 ms/cm and TDS is from 0 to 1999ppm. The temperature correction coefficient (β) is fixed at 2%/°C and allows for automatic temperature compensated measurements of E and TDS.
This meter is 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 1.41mS/cm or 1500ppm. The LCD screen has a batter life indicator as well as on-screen tutorial messages.
No probe changes are required when switching your measured parameter between pH, conductivity and TDS. This multiparameter meter reduces the number of instruments required for daily water quality analysis.
The supplied probe features 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.
- Automatic Temperature Compensation
- Simple calibration
- Low battery indicator
- Fast response multi-parameter probe
- CAL Check feature
- HI-1285-51 multi-parameter probe
- HI-70007 pH 7.01 calibration solution sachet
- HI-70442 1500 ppm (mg/L) calibration solution sachet
- HI-70031 1413 µS/cm calibration solution sachet
- HI-700661 electrode cleaning solution sachets (2)
- HI-50021 Calibration check solution sachets (2)
- Battery and instructions
- Rugged carrying case
- *Orange rubber boot sold separately – HI-710008; blue boot – HI-710007
HI-9813-61 CAL Check TM Feature
The HI-9813-61’s CAL Check feature alerts users if there is a problem with the pH electrode. This feature is important for customers that 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 that 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. Placing the HI-1285-61 pH/EC electrode in HI-50021 CAL Check solution and pressing the “Check” button helps users determine if the probe needs to be calibrated, cleaned or replaced. 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.
About the HI-1285 series probes
The HI-9813-51 and HI-9813-61 are supplied with a polypropylene body pH/EC/TDS/temperature probe. The pH, EC, TDS and temperature sensor are housed in a single body that connects to the meter with a DIN connector.
3 sensors in a single probe
Amplified pH electrode – The pH electrode 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 pumps 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 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.