User manual HANNA INSTRUMENTS HI 931101

[. . . ] Instruction Manual HI 931100 · HI 931101 Waterproof Instruments for Salinity and Sodium Content Measurements www. hannainst. com 1 PRELIMINARY EXAMINATION Dear Customer, Thank you for choosing a HANNA instruments® product. Please read this instruction manual carefully before using the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com These instruments are in compliance with the directives. Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. [. . . ] · For an accurate calibration, use two beakers for each solution, the first one for rinsing the electrode, the second one for calibration. If possible use plastic beakers to minimize any EMC interferences. · Turn the meter on by pressing the ON/OFF key. HI 70 83 HI 7083 HI 7085 · · Once stabilized "CON" symbol will appear on the display. · Remove the protective cap and rinse the electrode with some of the calibration solution you are going to use first. Shift downwards the rubber sleeve for a properly working junction (see picture). 15 14 SINGLE POINT CALIBRATION (OFFSET) · Dip the FC 300B sodium electrode into the HI 7083 (3. 00 g/L NaCl) solution. · To quit the calibration and save the first point, press the CAL key. CAL For better accuracy however, it is recommended that a two-point calibration is performed. TWO POINT CALIBRATION Note: Immerse the electrode approx. · After the first point is confirmed, immerse the FC300B electrode into the second solution: HI 7085 at 0. 3 g/L NaCl or HI 7081 at 30 g/L NaCl. Next measurements of cheese or meat samples will require shorter response time (less than 2 minutes). Do not rinse the sodium electrode between subsequent measurements since contamination is negligible. 3. Cover the beaker to prevent any spilling during stirring, place the beaker on a hot plate stirrer and agitate the sample at 40-50°C (104-122°F) for 15-20 minutes. IONIC STRENGTH ADJUSTER (ISA) When the NaCl concentration of the sample is lower than 5 g/L, it is recommend to use the HI 7090 ISA solution. In such case, calibration should be performed with standard solution containing 2% of ISA. Let the sample cool to the ambient temperature, then filter it. Dip the FC 300B sodium electrode into the filtered sample. 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). 18 ISA (Ionic Strength Adjuster) = 50% of NH4Cl 4M + 50% of NH4OH 4M (use 2 mL of ISA every 100 mL of sample). 19 TEMPERATURE The best working temperature is around 20-25°C (68-77°F). For greatest accuracy, it is recommended to calibrate the meter with standard solution at a temperature as close as possible to the temperature of the sample (± 1°C/±2°F). TEMPERATURE CALIBRATION (for Technical Personnel only) Na CONCENTRATION WITH HI 931100 It is always possible to determine the Na concentration by using the formula: XNa = XNaCl · (23 / 58. 4) where XNa = concentration of Na and XNaCl = concentration of NaCl INITIAL PREPARATION Prepare a 0°C/32°F bath with ice and water and another one at 50°C/122°F using hot water at a known temperature. Place insulation material around the containers to minimize temperature changes. Use a Checktemp or another accurate thermometer with a resolution of 0. 1° as reference. °C °C 0 °C (32 °F) 50 °C (122 °F) Note: A blinking "°C" indicates that the temperature probe is not connected. gm NaCl °C PROCEDURE · Connect the HI 7662 temperature probe to the RCA socket on the top of the instrument. · To enter the temperature calibration mode, press the CAL and ON/OFF keys simultaneously. · Immerse the temperature probe into the 0°C/32°F bath together with the reference thermometer. °C 0°C (32°F) · When the reading stabilizes, press the CAL key. The "0. 0°C", "CAL" and "BUF" symbols will be displayed. The " " symbol will blink for a few seconds. 21 °C CAL BUF 20 · When the input value becomes stable, the " " symbol disappears and "CON" will start blinking. °C CON FC300B CONDITIONING & MAINTENANCE Press the CFM key to confirm the calibration value. °C · Immerse the temperature probe into the 50°C (122°F) bath. 50°C (122°F) · Press the CAL key to display the "0. 0°C" and then press the BUF key to select "50. 0°C". "CAL" and " "BUF" symbols. [. . . ] If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid. [. . . ]