Hanna Instruments HI2550 Instruction Manual
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Hanna Instruments HI2550 Instruction Manual

Hanna Instruments HI2550 Instruction Manual

Multiparameter ph/orp/c ec/tds/nacl bench meter
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Instruction Manual
HI2550
Multiparameter
pH/ORP/°C
EC/TDS/NaCl
Bench Meter
www.hannainst.com
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Summary of Contents for Hanna Instruments HI2550

  • Page 1 Instruction Manual HI2550 Multiparameter pH/ORP/°C EC/TDS/NaCl Bench Meter www.hannainst.com...
  • Page 2 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.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS PRELIMINARY EXAMINATION ............4 GENERAL DESCRIPTION ..............4 FUNCTIONAL DESCRIPTION .............5 SPECIFICATIONS ................6 OPERATIONAL GUIDE ..............8 AUTO‑RANGING ................12 pH CALIBRATION .................13 pH BUFFER TEMPERATURE DEPENDENCE ........18 RELATIVE mV CALIBRATION ............19 EC/TDS CALIBRATION ..............19 CONDUCTIVITY VERSUS TEMPERATURE CHART .......21 NaCl CALIBRATION ...............22 GOOD LABORATORY PRACTICE (GLP) ..........23 LOGGING FUNCTION ..............28 SETUP ..................35...

  • Page 4: Preliminary Examination

    All defective items must be returned in the original packing with the supplied accessories. GENERAL DESCRIPTION The HI2550 is a microprocessor based pH, ORP, Conductivity (EC), TDS, NaCl, and Temperature Bench Meter. Relative mV feature is also provided. pH measurements are compensated for temperature effect manually or automatically with the HI7662 temperature probe.

  • Page 5: Functional Description

    FUNCTIONAL DESCRIPTION Front Panel Rear Panel 1) Liquid Crystal Display (LCD). 2) CAL key, to enter and exit calibration mode. RCL key (alternate function), to enter and exit memory recall. 3) CFM/GLP key, to confirm calibration selection, different setup values or to display Good Laboratory Practice information.

  • Page 6: Specifications

    SPECIFICATIONS –2.0 to 16.0 pH –2.00 to 16.00 pH –2.000 to 16.000 pH ±999.9 mV (ISE & ORP) ±2000 mV (ISE & ORP) 0.00 to 29.99 µS/cm 30.0 to 299.9 µS/cm 300 to 2999 µS/cm 3.00 to 29.99 mS/cm 30.0 to 200.0 mS/cm RANGE up to 500.0 mS/cm uncompensated conductivity...
  • Page 7 ±0.01 pH ±0.002 pH ±0.2 mV (±999.9 mV) ±1 mV (±2000 mV) ACCURACY ±1 % reading (±0.05 µS/cm or 1 digit, @ 20 °C / 68 °F whichever is greater) ±1 % of reading (±0.03 ppm or 1 digit, whichever is greater) ±1% of reading ±0.4 ºC (excluding probe error) Rel mV offset range...

  • Page 8: Operational Guide

    OPERATIONAL GUIDE POWER CONNECTION Plug the 12 VDC adapter into the power supply socket. Notes: This instrument uses non volatile memory to retain the calibration parameters and all other settings, even when unplugged. Make sure a fuse protects the main line. ELECTRODE AND PROBE CONNECTIONS For pH or ORP measurements connect an electrode with internal reference to the BNC connector on the back of the instrument.
  • Page 9 • The pH is displayed on the primary LCD and the temperature on the secondary LCD. • If the reading is out of range, the closest full‑scale value will be displayed blinking on the primary LCD. If measurements are taken successively in different samples, it is recommended to rinse the electrode thoroughly with deionized water or tap water and then with some of the next sample to prevent cross‑contamination.
  • Page 10 • If the reading is out of range, the closest full‑scale value will be displayed blinking on the primary LCD. RELATIVE mV MEASUREMENTS • Press the ALT&MODE keys simultaneously while in mV range. The “mV” and “Rel” tags are displayed. The reading displayed by the instrument is equal to the difference between the current mV input value and the relative mV offset established in the relative mV calibration.
  • Page 11 Automatic (ATC): The conductivity probe has a built‑in temperature sensor; the temperature value is used to automatically compensate the EC/TDS reading. The “ATC” tag is displayed when this option is active. Manual (MTC): The temperature value, shown on the secondary LCD, can be manually set with the ARROW keys.

  • Page 12: Auto-Ranging

    NaCl MEASUREMENTS Press the ALT&MODE keys while in EC range until NaCl is displayed on the LCD. The instrument will display the NaCl reading on the primary LCD and the temperature reading on the secondary LCD line. • If the reading is out of range, the full‑scale value (400.0%) will be displayed blinking.

  • Page 13: Ph Calibration

    pH CALIBRATION Calibrate the instrument frequently, especially if high accuracy is required. The instrument should be recalibrated: • Whenever the pH electrode is replaced. • At least once a day. • After testing aggressive chemicals. • If “CAL” “Intv.” tags are blinking during measurement. Every time you calibrate the instrument use fresh buffers and perform an electrode Cleaning Procedure (see page 53).
  • Page 14 FIVE-POINT CALIBRATION • Submerse the pH electrode and the temperature probe approximately 3 cm (1¼”) into a buffer solution and stir gently. The temperature probe should be close to the pH electrode. • Press CAL. The “CAL” and “ ” tags will appear and the “7.01”...
  • Page 15 • If necessary, press the ARROW keys to select a different buffer value. • The “ ” tag will blink on the LCD until the reading is stable. • When the reading is stable and close to the selected buffer, the “CFM” tag will blink. •...
  • Page 16 ONE-POINT CALIBRATION Two SETUP selectable options are available: “Pnt” and “OFFS”. If the “Pnt” option is selected, the new calibration point overrides an existing one. The adjacent slopes will be reevaluated. If the “OFFS” option is selected, an electrode offset correction is performed.
  • Page 17 • Each time a buffer is confirmed, the new calibration data replaces the old calibration data for the corresponding buffer. If current buffer has no previous data stored and the calibration is not full (five buffers), the current buffer is added to the existing calibration. If the existing calibration is full, the instrument asks which buffer to replace.

  • Page 18: Ph Buffer Temperature Dependence

    pH BUFFER TEMPERATURE DEPENDENCE The temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes to a lesser degree than normal solutions. During calibration the instrument will automatically calibrate to the pH value corresponding to the measured or set temperature. TEMP pH BUFFERS °C...

  • Page 19: Relative Mv Calibration

    RELATIVE mV CALIBRATION • Press CAL when the instrument is in RELATIVE mV measurement mode. The “mV Rel” and “ ” tags will be displayed. Absolute mV is displayed on the primary LCD and “AbS” message is displayed on the secondary LCD. •...
  • Page 20 Select the desired value with the ARROW keys, if necessary. When the reading is stable, “CFM” tag starts blinking on the LCD, asking for confirmation. Press CFM to confirm calibration. The instrument stores the calibration value and returns to measurement mode. Notes: •...

  • Page 21: Conductivity Versus Temperature Chart

    The dependency of conductivity on temperature is expressed as a relative change per Celsius degrees at a particular temperature, com‑ monly as %/ ºC. The following table lists the temperature dependence of Hanna Instruments EC calibration buffers. HI7030 HI7031...

  • Page 22: Nacl Calibration

    NaCl CALIBRATION NaCl calibration is a one‑point calibration at 100.0% NaCl. Use the HI7037L calibration solution (sea water solution) as a 100% NaCl calibration solution. Rinse the probe with some of the calibration solution or deionized water. Submerse the probe into HI7037L solution.

  • Page 23: Good Laboratory Practice (Glp)

    GOOD LABORATORY PRACTICE (GLP) GLP is a set of functions that allows storage and retrieval of data regarding the maintenance and status of the system. 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.
  • Page 24 • 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: The fourth pH calibration buffer: The fifth pH calibration buffer:...
  • Page 25 ‑ or the number of days until the calibration alarm will be displayed. ‑ or if expired (7 days ago). • The instrument ID. Relative 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.
  • Page 26 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: •...
  • Page 27 NaCl 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: •...

  • Page 28: Logging Function

    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. To select logging type enter SETUP menu. LOGGING THE CURRENT DATA (manual logging) Select the manual logging mode in SETUP menu.
  • Page 29 LOT LOGGING Select “StAb” (stability logging) or the desired time interval. To start interval logging press LOG key while the instrument is in measurement mode. When the selected interval is reached or when the reading is stable (for log on stability), the instrument will display the current lot number on the primary LCD line, the record number on the secondary LCD line and the LOG tag (see example below: Lot 1 record 11): followed by the number of free records on the corresponding memory...
  • Page 30 No pH measurements records: No Relative mV and mV records: No EC records: No TDS records: No NaCl records: Otherwise, the instrument will display the lot number on the primary LCD line, the number of records on the secondary, “RCL” tag and “CFM” blinking.
  • Page 31 Press CFM to view record information. • If RCL was entered while in pH measurement range: In Rel mV range: In EC measurement range: In TDS measurement range: In NaCl measurement range: Use the ARROW keys to scroll through the records. Note: The instrument will automatically skip log records from other measurement ranges for the manual log.
  • Page 32 • The time on the primary LCD, along with “TIME” tag and the record number on the secondary LCD. • The date on the primary LCD, along with “DATE” tag. • The calibration offset on the primary LCD and “OFFS” message on the secondary LCD.
  • Page 33 • Press SETUP to delete all records/lots. The display will show “dEL” in the primary LCD and “ALL” in the secondary LCD. • Press CFM to confirm delete. While deleting the “ ” tag will blink. • Press CAL or RANGE or CLR to escape and return to the RCL screen. •...
  • Page 34 • The temperature coefficient on the primary LCD and “tc” message on the secondary LCD. For TDS Range • The temperature reading as described in pH range. • The conductivity value on the primary LCD and the temperature value on the secondary LCD. •...

  • Page 35: Setup

    SETUP Setup mode allows viewing and modifying the following instrument parameters. In according with the selected range, SETUP menu allows the possibility to view and /or change specific range parameters and common parameters (for all the ranges). The common parameters are: •...
  • Page 36 EXPIRED CALIBRATION ALARM Press CAL when the calibration time‑out is displayed. Calibration time‑out (“OFF” or “1” to “7” days) and “CFM” will start blinking. Press the ARROW keys to change the calibration time‑out value. Press CFM to save the modified calibration time‑out value. Press CAL to escape without saving.
  • Page 37 SECOND CUSTOM BUFFER Press CAL when “Cust. Buff. 2” is displayed. The custom buffer (disabled – “no” or “0” to ”16” pH) and “CFM” will start blinking. Press the ARROW keys to change the custom buffer value. Press CFM to save the modified custom buffer value. Press CAL to escape without saving.
  • Page 38 CURRENT TIME Press CAL when the current time is displayed. The hour and “CFM” will start blinking. Press the ARROW keys to change the hour. Press RANGE. The minutes and “CFM” will start blinking. Press the ARROW keys to change the minutes. Press CFM to save the modified value.
  • Page 39 BEEP STATUS Press CAL when the beep status is displayed. Beep status (“On” or “OFF”) and “CFM” will start blinking. Press the ARROW keys to change the beep status (On or OFF). Press CFM to save the modified beep status. Press CAL to escape without saving.
  • Page 40 CELL CONSTANT Press CAL when the cell constant is displayed. The cell constant and “CFM” will start blinking. Press the ARROW keys to change the cell constant (0.500 to 1.700). Press CFM to save the modified cell constant. Press CAL to escape without saving. TDS FACTOR Press CAL when “TDSfact.”...
  • Page 41 REFERENCE TEMPERATURE Press CAL when the reference temperature is displayed. The reference temperature and “CFM” will start blinking. Press the ARROW keys to toggle between 20.0 ºC and 25.0 ºC reference temperature value. Press CFM to save the modified reference temperature value. Press CAL to escape without saving.

  • Page 42: Temperature Calibration (For Technical Personnel Only)42

    If the temperature measurements are inaccurate, temperature recalibra‑ tion should be performed. For an accurate recalibration, contact your local Hanna Instruments Office, or follow the instructions below. • Prepare a vessel containing ice and water and another one containing hot water (around 50 ºC).
  • Page 43 • Press CFM to confirm. The secondary LCD will show “50.0 ºC“.• Submerse the temperature probe (or EC probe) in the second vessel as near as possible to the calibrated thermometer. Allow a few seconds for the probe to stabilize. •...

  • Page 44: Mv Calibration (For Technical Personnel Only)

    If the mV measurements are inaccurate, mV recalibration should be performed. For an accurate recalibration, contact your local Hanna Instruments Office. A two‑point calibration can be performed at 0.0 mV and 1800.0 mV. • Attach to the BNC connector a mV simulator with an accuracy of ±0.1 mV.

  • Page 45: Pc Interface

    (optional). HI92000 also ® offers graphing and an on‑line help feature. To allow our users access to the latest version of Hanna Instruments PC compatible software, we made the products available for download at http://software.hannainst.com. Select the product code and click Download Now.
  • Page 46 CHRxx Change the instrument range according with the parameter value (xx): • xx=00 pH range/0.001 resolution • xx=01 pH range/0.01 resolution • xx=02 pH range/0.1 resolution • xx=03 mV range • xx=04 Relative mV range • xx=06 EC range • xx=07 TDS range •...
  • Page 47 • Reading status (2 chars): R ‑ in range, O ‑ over range, U ‑ under range. First character corresponds to the appropriate range reading. Second character corresponds to mV reading (if exist). • Primary reading (corresponding to the selected range) ‑...
  • Page 48 • EC calibration data (if available), which contains: • the number of calibrated standards (1 char) • the offset factor, with sign and decimal point (7 chars) • the cell constant, with sign and decimal point (7 chars) • the calibration time, yymmddhhmmss (12 chars) •...
  • Page 49 • Calibration alarm time out for pH range (2 chars) • SETUP information (2 chars): 8 bit hexadecimal encoding. • 0x01 ‑ beep ON (else OFF) • 0x04 ‑ degrees Celsius (else degrees Fahrenheit) • 0x08 ‑ Offset calibration (else Point calibration) •...
  • Page 50 GLDxxxff: Requests the records of the “xxx” lot number. The records are sent in frames of 10 records; “ff” is the frame number (01 first frame). (Example: Lot 13 has 53 records. The records will be sent in 6 frame, 5 with10 records and 1 with 3 records.) Command Parameters: xxx ‑...

  • Page 51: Electrode Conditioning And Maintenance

    ELECTRODE CONDITIONING AND MAINTENANCE PREPARATION PROCEDURE Remove the protective cap of the pH electrode. DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal with electrodes. They will disappear when rinsed with water. During transport, tiny bubbles of air may form inside the glass bulb affecting proper functioning of the electrode.
  • Page 52 For refillable electrodes: If the filling solution (electrolyte) is more than 2½ cm (1”) below the fill hole, add HI7082 or HI8082 3.5M KCl Electrolyte Solution for double junction or HI7071 or HI8071 3.5M KCl+AgCl Electrolyte Solution for single junction electrodes. For faster response, unscrew the fill hole screw during measurements.
  • Page 53 Allow the electrode to stand upright for 1 hour. Follow the Storage Procedure above. pH ELECTRODE CLEANING PROCEDURE • General Soak in Hanna Instruments HI7061 or HI8061 General Cleaning Solution for approximately ½ hour. • Protein Soak in Hanna Instruments HI7073 or HI8073 Protein Cleaning Solution for 15 minutes.

  • Page 54: Troubleshooting Guide

    TROUBLESHOOTING GUIDE SYMPTOMS PROBLEM SOLUTION Slow response/excessive Dirty pH electrode. Soak the electrode tip drift measuring pH. in HI7061 or HI8061 for 30 minutes and then clean the electrode. Readings fluctuate up Clogged/dirty junction. Clean the electrode. and down (noise). Low electrolyte level Refill with fresh solution (refillable pH electrodes...

  • Page 55: Temperature Correlation For Ph Sensitive Glass

    The pH at which the interference starts to be significant depends upon the composition of the glass. This interference is called alkaline error and causes the pH to be underestimated. Hanna Instruments’ glass formulations have the indicated characteristics. Sodium Ion Correction for the Glass at 20-25 ºC...

  • Page 56: Accessories

    ACCESSORIES pH BUFFER SOLUTIONS HI70004P pH4.01 Buffer Sachets, 20 mL, 25 pcs HI70007P pH7.01 Buffer Sachets, 20 mL, 25 pcs HI70010P pH10.01 Buffer Sachets, 20 mL, 25 pcs HI7001L pH1.68 Buffer Solution, 500 mL HI7004L pH4.01 Buffer Solution, 500 mL HI7006L pH6.86 Buffer Solution, 500 mL HI7007L pH7.01 Buffer Solution, 500 mL HI7009L pH9.18 Buffer Solution, 500 mL...
  • Page 57 ORP PRETREATMENT SOLUTIONS HI7091L Reducing Pretreatment Solution, 500 mL HI7092L Oxidizing Pretreatment Solution, 500 mL CONDUCTIVITY SOLUTIONS HI70030P 12880 S/cm ( mho/cm), 20 mL sachets (25 pcs.) µ µ HI70031P 1413 S/cm ( mho/cm), 20 mL sachets (25 pcs.) µ µ...
  • Page 58 pH ELECTRODES All electrodes part numbers ending in B are supplied with a BNC connector and 1 m (3.3’) cable, as shown below : HI1043B Glass‑body, double junction, refillable, combination pH electrode. Use: strong acid/alkali. HI1053B Glass‑body, triple ceramic, conic shape, refillable, combination pH electrode.
  • Page 59 HI1330B Glass‑body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory, vials. HI1331B Glass‑body, semimicro, single junction, refillable, combination pH electrode. Use: flasks. HI1230B Plastic‑body (PES), double junction, gel‑filled, combination pH electrode. Use: general, field. HI2031B Glass‑body, semimicro, conic, refillable, combination pH electrode. Use: semisolid products.
  • Page 60 FC100B Plastic‑body (PVDF), double junction, refillable, combination pH electrode. Use: general purpose for food industry. FC200B Plastic‑body (PVDF), open junction, conic, Viscolene, non‑refillable, combination pH electrode. Use: meat & cheese. FC210B Glass‑body, double junction, conic, Viscolene, non‑refillable, combination pH electrode. Use: milk, yogurt. FC220B Glass‑body, triple‑ceramic, single junction, refillable, combination pH electrode.
  • Page 61 Glass‑body, refillable, combination platinum ORP electrode. Use: titration. HI3230B Plastic‑body (PES), gel‑filled, combination platinum ORP electrode. Use: general purpose. HI4430B Plastic‑body (PES), gel‑filled, combination gold ORP electrode. Use: general purpose. Consult the Hanna Instruments General Catalog for more electrodes with screw‑type or BNC connectors.
  • Page 62 EXTENSION CABLE FOR SCREW-TYPE ELECTRODES (SCREW TO BNC ADAPTER) HI7855/1 Extension cable 1 m (3.3’) long HI7855/3 Extension cable 3 m (9.9’) long OTHER ACCESSORIES HI710005 Voltage adapter from 115 VAC to 12 VDC (USA plug) Voltage adapter from 230 VAC to 12 VDC HI710006 (European plug) Voltage adapter from 240 VAC to 12 VDC (UK plug)
  • Page 63 For yours and the meter’s safety do not use or store the meter in hazardous environments. WARRANTY HI2550 is guaranteed for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. Electrodes and probes are guaranteed for six months. This warranty is limited to repair or replacement free of charge.
  • Page 64 World Headquarters Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA www.hannainst.com MAN2550 06/19 Printed in ROMANIA...

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