Electronic pH Meter with Colour Display

• Measured quantity: acidity or alkalinity (pH) of liquids, solutions, water and soil extracts
• Measuring range: 0.00 to 14.00 pH
• Resolution: 0.01 pH
• Measurement error: ±0.1 pH
• Display: colour liquid-crystal, 1.8 inch diagonal, shows the measurement result immediately as it is taken
• Operating mode: standalone, with no cable connection to a computer or tablet and no transfer of results to one
• Electrode: measuring electrode, replaceable
• Calibration: against the buffer solutions supplied in the set
• Operating temperature of the instrument: 0 to 60 °C
• Power supply: standalone, from a battery or a rechargeable cell
• Set contents: instrument with measuring electrode, buffer solutions, storage box, manual
• Conformity: CE and WEEE marking, EU directives and regulations

Product passport: sens-at-020 (PDF)

Use and Handling

• Intended users: general secondary education institutions, learners aged 10 and older (grade 5 and above), under the supervision of a teacher
• Applications: practical and field lessons — pH of liquids and solutions, natural water samples, soil extracts
• Reading results: the value first changes quickly and then stabilises; only the settled value is recorded, together with sample temperature, place and time of sampling
• Calibration: performed before every series of measurements, after replacing the electrode and after a long break; buffer solution is poured into clean glassware and never returned to the bottle
• Field work: the instrument is carried in the box together with buffer solutions and distilled water for rinsing; calibration is done before setting out and readings are checked against a buffer solution on site

Safety

• Use only batteries of the type and rating stated in the passport or on the housing; observe polarity and do not mix new and partly discharged cells
• Remove the batteries if the instrument will not be used for more than a month; leaking electrolyte destroys the instrument
• Do not open the housing, and protect it from impact, moisture and direct sunlight; do not recharge non-rechargeable cells or throw them into fire
• Do not touch the sensitive element of the electrode and do not wipe it dry; drops are removed by touching a soft tissue to it
• Immerse the electrode only to the depth provided by its design, without resting it on the bottom or walls of the vessel and without stirring the solution
• Work with samples and reagents in protective goggles and gloves; measure pH only within 0 to 60 °C and never immerse the electrode in hot solutions or melts
• Pupils work with the instrument under the supervision of a teacher

Maintenance

• Rinse the electrode with distilled water before and after each measurement and whenever moving from one sample to another
• Store the electrode with the sensitive element wet — in the cap with storage solution or in a buffer solution from the set; a dried-out electrode loses sensitivity and its error grows beyond ±0.1 pH
• Clean a fouled electrode as instructed by the manufacturer, without abrasives or hard brushes, then recalibrate
• Wipe the housing and the display with a soft damp cloth without solvents; do not immerse the instrument in water and keep the electrode connector dry and clean
• Keep buffer solutions in tightly closed bottles and replace them after the manufacturer's expiry date
• Replace an electrode that gives unstable readings in buffer solution even after calibration

Storage and Transport

• Storage: in the box, in a dry, clean, ventilated and heated room at +5 °C to +40 °C and relative humidity of 60 % (non-condensing), away from direct sunlight, moisture, dust, heat sources and reagents
• Operating climate: air temperature +5 °C to +40 °C, relative humidity 40 % to 60 %, atmospheric pressure 84 to 107 kPa
• Transport: in the manufacturer's packaging, protected from precipitation and impact during loading

Warranty and Disposal

• Warranty: defect repair and replacement of defective parts or equipment for 3 years; spare parts and consumables available for 5 years
• Disposal: WEEE marked — not to be disposed of with unsorted household waste; batteries are removed and handed in separately, metal parts go to scrap metal and electronic components to specialised recycling
• Manufacturer: UNOWA Sp. z o. o., 30/34 Zwierzyniecka St., 60-814 Poznań, Poland