User manual HANNA INSTRUMENTS HI 3050N

[. . . ] istrstirR2. p65 1 2 Instruction Manual Magnetic Stirrers Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the meter. This manual will provide you with the necessary information for a correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] SET/MEASURE selector switch for LCD SET/MEASURE, display M. SET-POINT adjust the set-point of pH SET-POINT, N. DISPLAY LCD display for pH measureDISPLAY, ment or pH set-point. AC POWER CORD or battery plug for model HI 190MB. FUSE holder for 200 mA or 1A fuse depending on models. NOTE: HI 190M, HI 190MB and HI 200M are not provided with ON/OFF switch. They are switched on when there is a power supply input. MINI AND GENERAL PURPOSE STIRRERS Models: HI 190M, HI 190MB, HI 200M, HI 300N normal stirrers and HI 310M Auto Speed stirrer Fig. 2 These general purpose stirrers are suitable for daily stirring applications in the laboratory. The HI 190M, HI 190MB and HI 200M are compact designed mini stirrers of 1 litre capacity suitable for use on crowed benches. The HI 190M and HI 190MB are enclosed completely in chemical and impact resistant plastic housing. The HI 200M, HI 300N and HI 310N are covered with a corrosion resistant stainless steel top. Newtonian fluids up to 1 litre USE HI 190M or HI 190MB or HI 200M 2. Newtonian fluids up to 2. 5 litres HI 300N Fig. Non-Newtonian fluids up to 5 litres whose viscosities change during stirring or Newtonian fluids up to 5 litres or mixing operation where load changes during stirring. 10 istrstirR2. p65 11 12 OPERATION 1. Make sure that the SPEED knob (B) and the ON/OFF switch (L) (except HI 190M, HI 190MB and HI 200M) are in the OFF positions. Place a beaker or glass container on top of the stirrer and place the stirring bar at the centre of the beaker base. Pour the liquids to be mixed into the beaker. Do not fill the brim and leave sufficient space to prevent spillage during stirring. Connect power cable and switch on the power supply. Then the stirrer on with the ON/OFF switch (except HI 190M, HI 190MB and HI 200M). Adjust the SPEED knob slowly until the required stirring speed is achieved. [. . . ] if the temperature of the buffer is 20ºC, adjust the OFFSET knob to display 7. 03 pH. Rinse the pH electrode thoroughly in water and immerse in pH 4. 01 or pH 10. 01 buffer solution. 17 18 istrstirR2. p65 19 20 Table 4 7. The calibration is now completed and the stirrer is ready for use. WARRANTY All Hanna Instruments meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. The Probes are warranted for a period of six months. [. . . ]