User manual HANNA INSTRUMENTS HI 2550

[. . . ] Instruction Manual HI 2550 Multiparameter pH/ORP/°C EC/TDS/NaCl Bench Meter w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using this instrument. This manual will provide you with the necessary information for correct use of this instrument, as well as a precise idea of its versatility. [. . . ] A new NaCl calibration is required. 22 GOOD LABORATORY PRACTICE (GLP) GLP is a set of functions that allows storage and retrieval of data regarding the maintenance and status of the electrode. All data regarding pH, Rel mV, EC and NaCl calibration is stored for the user to review when necessary. EXPIRED CALIBRATION For pH calibration, this instrument allows the user to set the number of days before the next required pH calibration. When calibration has expired the "CAL" and "INTV" tags will blink to warn the user that the instrument should be recalibrated. For example, if a 4 days time out has been selected, the instrument will issue the alarm exactly 4 days after the last calibration. to 5 days), then the alarm will be immediately recalculated and appear 5 days after the last calibration. Note: If the instrument was not calibrated, the "CAL" "INTV" tags will be displayed even if the feature is disabled in SETUP menu. pH CALIBRATION DATA Calibration data is stored automatically after a successful calibration. To view the pH calibration data, press GLP when the instrument is in pH (mV) measurement mode. The instrument will display the time (hh:mm) of the last calibration. Use the ARROW keys to scroll through the calibration data: · The date (yyyy. mm. dd). · The pH calibration offset. CAL mV 23 · The pH calibration slope (the GLP slope is the average of the calibration slopes; the percentage is referred to the ideal value of 59. 16 mV/pH). · The calibration buffers in order. The first pH calibration buffer: The second pH calibration buffer: The third pH calibration buffer: CAL pH BUF The fourth pH calibration buffer: CAL pH BUF The fifth pH calibration buffer: CAL pH BUF Notes: · The "OLd" message displayed beside the pH value means that this buffer was not used during last calibration. Press and hold down the SETUP key if you want to see calibration date (or time if old calibration was performed on the same day as the current calibration). · If "no bUF" message appears on the LCD, the instrument informs you that calibration was performed in less than three points. CAL BUF · Calibration Expiration status: - if disabled. 24 - or the number of days until the calibration alarm will be displayed. - or if expired (7 days ago). CAL INTV · The instrument ID. R elative mV CALIBRATION DATA Relative mV calibration data is stored automatically after a successful calibration. To view the Relative mV calibration data, press GLP when the instrument is in Relative mV measurement mode. The instrument will display the time (hh:mm) of the last calibration. CAL TIME Use the ARROW keys to scroll through the calibration data: · The date (yyyy:mm:dd). · The Relative mV calibration offset. · The instrument ID. 25 EC CALIBRATION DATA EC calibration data is stored automatically after a successful calibration. To view the EC calibration data, press GLP when the instrument is in EC measurement mode. The instrument will display the time (hh:mm) of the last calibration. Use the ARROW key to scroll through the calibration data: · The date (yyyy:mm:dd). · The EC calibration buffer. · The cell constant. · The calibration offset factor. · The reference temperature. · The temperature coefficient. 26 · The temperature compensation mode. · The instrument ID. N aCl CALIBRATION DATA NaCl calibration data is stored automatically after a successful calibration. To view the NaCl calibration data, press GLP when the instrument is in NaCl measurement mode. The instrument will display the time (hh:mm) of the last calibration. Use the ARROW key to scroll through the calibration data: · The date (yyyy:mm:dd). · The salinity coefficient. · The cell constant. · The reference temperature. 27 · The temperature compensation mode. · The instrument ID. Notes: · If no temperature compensation is selected during calibration, the temperature coefficient is not displayed in GLP. · Press GLP at any moment and the instrument will return to measurement mode. · If calibration has not been performed on the selected range, the instrument displays "no CAL" message blinking. CAL LOGGING FUNCTION Up to 700 logged samples can be stored into memory. 200 manually logged records and 500 lot logging records can be stored in the memory. [. . . ] Use: general purpose. 58 HI 1330B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory, vials. HI 1331B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: flasks. HI 1230B Plastic-body (PES), double junction, gel-filled, combination pH electrode. Use: general, field. HI 2031B Glass-body, semimicro, conic, refillable, combination pH electrode. [. . . ]