User manual HANNA INSTRUMENTS HI 98203

[. . . ] SALINTEST HI98203 Salinity Concentration Pocket-sized Meter GENERAL INFORMATION: The SALINTEST utilizes a sodium ion-selective glass electrode to determine the activity of sodium ions in solution. Measurement of concentration of the Na+ ions is an indicator of the concentration of NaCl. [. . . ] · After use, switch the meter off and rinse the electrode with water to minimize contamination. · Large differences in pNa readings (±0. 1) could be due to a dry electrode or lack in calibration. · To improve performance, leave the meter in HI7081 solution for a few minutes at least once a week. Manufacturers since 1978 SALINTEST HI98203 SPECIFICATIONS: RANGE Salinity Concentration Pocket-sized Meter 0. 00 to 1. 00 pNaCl (58. 4 to 5. 84 g/L NaCl) RESOLUTION 0. 01 pNaCl ACCURACY (@20°C/68°F) ±0. 02 pNaCl TYPICAL EMC DEVIATION ±0. 04 pNaCl ENVIRONMENT 0 to 50 C (32 to 122 F); 95% RH BATTERY TYPE 4 x 1. 5V alkaline (included) BATTERY LIFE approx. 500 hours of continuous use DIMENSIONS 175x41x23 mm (7. 9x1. 8x1") WEIGHT 78 g (2. 7 oz. ) ACCESSORIES: HI 7081L 30 g/L NaCl solution (460 mL bottle) HI 7081M 30 g/L NaCl solution (230 mL bottle) HI 7061M Electrode cleaning solution (230 mL bottle) HI 73202 Spare electrode HI 731326 Calibration screwdriver (20 pcs) CALIBRATION: · Immerse the tester in HI7081 (30 g/L NaCl) calibration solution, without exceeding the maximum immersion level. · Allow the reading to stabilize and with a small screwdriver turn the calibration trimmer until the display shows "0. 30". MAINTENANCE: In case of erroneous reading even after an accurate calibration, the reference junction can be contaminated or clogged. Pull out 2 mm (1/8'') of the cloth junction to renew the electrode reference (it is recommended to cut the cloth leaving always at least 2 mm -1/ 8'' over the reference compartment) and repeat the calibration procedure. After that, the electrode can be replaced (see the Electrode Replacement section). BATTERY REPLACEMENT: If display fades or the SALINTEST switches off, the batteries must be replaced. Slide off the battery compartment cover and replace all four 1. 5V batteries while paying attention to their polarity. · Remove the fastening screw on the front (1) to loose the electrode. The internal circuit is connected to the electrode trough two wires (one for the glass sensor and one for the reference). Remove the two small screws (2 & 3) which fasten the two connecting wires to their sockets. Internal circuit: ONE YEAR WARRANTY AND SERVICEABLE: Covered by one year warranty against defects in workmanship and materials, this tester is now completely serviceable. [. . . ] · Reinsert the internal circuit complete with the new electrode into the plastic casing. · Recalibrate the SALINTEST before performing new measurements. [. . . ]