User manual HANNA INSTRUMENTS HI 931100

[. . . ] mannacl_r1. P65 1 2 Instruction Manual HI 931100 HI 931101 HI 931102 Foodcare Water-resistant Microprocessor-based Sodium / Sodium Chloride Meters 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 all the necessary information for the correct use of the instrument, as well as a precise idea of its versatility in a wide range of applications. These instruments are in compliance with directives. TABLE OF CONTENTS Preliminary Examination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] For best results, wait for a couple of minutes before 19 pressing the CFM key. HI 931100 and HI931102 will then display "30. 0 gm". SINGLE POINT CALIBRATION (OFFSET) CFM NaCl °C CAL BUF gm 3 g/L NaCl CFM · If the CAL key is pressed at this point, the calibration process is ended providing only one point calibration. For better accuracy however, it is recommended that a two-point calibration is performed. CAL CAL CAL TWO POINT CALIBRATION CAL · Proceed as described in "Single Point Calibration" but do not quit calibration by pressing the CAL key. · After the first point is confirmed, immerse the FC 300B electrode into the second buffer solution at 0. 3 g/L NaCl (HI 7085/ HI 8085) or 30 g/L NaCl (HI 7081/HI8081). Note: the electrode should be immersed approximately 2. 5 cm (1") into the solution. 0. 3 g/L or 30 g/L NaCl 20 mannacl_r1. P65 21 22 · Select the buffer value by pressing the BUF key. Make sure that the buffer value selected through the BUF key corresponds to the one being used for the second point calibration. · If the reading is not close to the selected buffer, the "BUF" prompt will blink. If on the other hand, the reading is close to the selected buffer, the meter will recognize the standard solution. The BUF symbol will stay still on the display, while the " " symbol will blink, indicating that the meter is stabilizing its reading. · Once stabilized "CON" symbol will appear on the display. For best results, wait for a couple of minutes and press the CFM key. BUF SPECIAL APPLICATIONS & ADDITIONAL INFORMATION BUF HOW TO MEASURE SODIUM CHLORIDE IN CHEESE AND MEAT (HI 931100 & HI931102) 1. Add (X) x 10mL of deionized water (note: ignoring water content in cheese and meat). CFM 4. Cover the beaker to prevent any spilling during stirring, place the beaker on the top of a hot plate stirrer and agitate the sample at 40-50°C (104-122°F) for 15-20 minutes. CFM · The meter will return to its normal mode and the two point calibration process is completed. Let the sample cool to the ambient temperature, then filter it. 21 22 mannacl_r1. P65 23 24 6. The tip of the electrode should be immersed for approximately 2. 5 cm/1" (i. e. the electrode junction must be completely immersed) without touching the bottom of the beaker. During measurement, the sample should be gently stirred (100 rpm). IONIC STRENGTH ADJUSTER (ISA) It is recommend the use of HI 7090 ISA solution when the NaCl concentration of the sample is lower than 5 g/L. In such case, the calibration of the meters should be performed with standard solution containing 2% of ISA. ISA (Ionic Strength Adjuster) = 50% of NH4 Cl 4M +50% of NH 4 OH 4M (use 2mL of ISA every 100 mL of sample). FILTERED SOLUTION MAGNETIC STIRRER HI 190M ON TEMPERATURE The best working temperature is around 2025°C (68-77°F). For greatest accuracy, we suggest to perform the calibration of the meter with standard solution at a temperature as close as possible to the temperature of the sample (± 1°C/ ±2°F). POWER OFF MAX SPEED 7. Since the dilution rate is 1/10, the reading in the g/L range has to be divided by 100 to get the actual reading of NaCl (per gram of cheese or meat) or it can be considered the value directly expressed in % of NaCl. Note: 10 to 15 minutes as response time, in the first measurement taken in samples of cheese or meat, is the right amount of time needed by the electrode to stabilize. [. . . ] - Oil/grease Rinse with Hanna HI 7077 or HI 8077 Oil and Fat Cleaning Solution. IMPORTANT: After performing any of the cleaning procedures rinse the electrode thoroughly with a solution containing 2% ISA (see page 22), refill (if necessary) the reference chamber with fresh electrolyte (HI 8093) and soak the electrode in a solution very close to the next sample to be measured for at least 1 hour before taking measurements. NEVER RUB OR BLOT DRY THE ELECTRODE. · Dry Membrane/Junction: Soak it overnight in HI7081 or HI8081 (30. 0 g/L NaCl) or HI7086 or HI8086 (23 g/L Na) before use. · Drifting: Soak the electrode tip in warm Hanna Solution HI 8093 for one hour. [. . . ]