Instruction Manual HI 99121 Soil pH Test Kit SPECIFICATIONS w w w . h a n n a i n s t .
PRELIMINARY EXAMINATION Dear Customer, Thank you for choosing a HANNA instruments® product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for correct use of the instrument, as well as a more precise idea of its versatility. If you need additional technical information, do not hesitate to email us at tech@hannainst.com. This instrument is in compliance with the directives.
SOIL p H pH is the measure of the hydrogen ion concentration [H+]. Soil can be acid, neutral or alkaline, according to its pH value. Fig. 1 shows the relationship between the scale of pH and types of soil. Most plants prefer a pH range from 5.5 to 7.5; but some species prefer more acid or alkaline soils. Nevertheless, every plant requires a particular range of pH, for optimum growth. Fig. 1.
High pH levels can depend on different elements, hence, there are different methods for its correction. - Soils rich with limestone: Add organic matter (this is due to the fact that non-organic ameliorants such as sulfur and sulfuric acid might not make economic sense due to the large quantities needed). - Alkaline-saline soils: Alkalinity is due to the presence of salts (in particular a high concentration of sodium can be harmful).
ORGANIC SUBSTRATE pH measurements of organic substrates is important in greenhouses and nursery growing pots. pH should be checked at the outset to make sure that the pH of the substrate bought is that desired (pH can change if too much time elapses from the date of packaging to the moment of utilization). A) Direct measurement in pot If the substrate is dry, add a little distilled water. Insert the electrode into the soil and take measurement.
HOUSE PLANTS Preferred pH Range Abutilon African violet Anthurium Araucaria Azalea Begonia Camellia Croton Cyclamen Dieffenbachia Dracaena Freesia 5.5-6.5 6-7 5-6 5-6 4.5-6 5.5-7.5 4.5-5.5 5-6 6-7 5-6 5-6 6-7.5 Preferred pH Range Gardenia Geranium Hibiscus Jasmine Kalanchoe Mimosa Orchid Palms Peperomia Philodendron Yucca pH METER SPECIFICATIONS 5-6 6-8 6-8 5.5-7 6-7.5 5-7 4.5-5.5 6-7.5 5-6 5-6 6-7.5 Range (*) Resolution Accuracy (@20°C/68°F) -2.00 to 16.00 pH -5.0 to 105.0°C / 23.0 to 221.0°F 0.
OPERATING THE pH METER To connect the probe With the meter turned off, connect the HI 1292D probe to the DIN socket on the top of the meter by aligning the pins and pushing in the plug. Tighten the nut to ensure a good connection. Remove the protective cap from the probe before taking any measurements. To turn the meter ON and check the battery status Press the ON/OFF/MODE button until the display lights up.
"7.01" (or "6.86") - "OK 1", and an audible signal is produced. After 1 second, the meter automatically returns to the normal measuring mode. Note: It is always recommended to carry out a two-point calibration for better accuracy. • For a two-point calibration, place the probe in pH 7.01 (or pH 6.86) buffer. After the calibration point has been accepted, the “pH 4.01 USE” message appears. The message is held for 12 seconds, unless a valid buffer is recognized.
TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769.0666 • Fax (03) 9769.0699 China: Tel. (10) 88570068 • Fax (10) 88570060 Egypt: Tel. & Fax (02) 2758.683 Germany: Tel. (07851) 9129-0 • Fax (07851) 9129-99 Greece: Tel. (210) 823.5192 • Fax (210) 884.0210 Indonesia: Tel. (21) 4584.2941 • Fax (21) 4584.2942 Japan: Tel. (03) 3258.9565 • Fax (03) 3258.9567 Korea: Tel. (02) 2278.5147 • Fax (02) 2264.1729 Malaysia: Tel. (603) 5638.9940 • Fax (603) 5638.9829 Singapore: Tel. 6296.7118 • Fax 6291.
