Hanna Instruments HI 253 Instruction Manual
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Hanna Instruments HI 253 Instruction Manual

Hanna Instruments HI 253 Instruction Manual

Microprocessor-based ph/mv/ion/ºc bench meter
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Instruction Manual
HI 253
Microprocessor-Based
pH/mV/Ion/ºC
Bench Meter
w w w. h a n n a i n s t . c o m
1

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  • Page 1 Instruction Manual HI 253 Microprocessor-Based pH/mV/Ion/ºC Bench Meter w w w. h a n n a i n s t . c o m...

  • Page 2: Table Of Contents

    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 Authori- zation number from the Technical Service department and then send it with shipping costs prepaid.

  • Page 3: Preliminary Examination

    An alarm time-out is available to alert the user that too much time elapsed since the last pH calibration. The instrument can store data in memory at the user’s request for later retrieval. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice.

  • Page 4: Functional Description

    FUNCTIONAL DESCRIPTION Primary LCD Front Panel Secondary LCD mV pH TIME DATE INTV BUFFER pH READY WRONG Functions pH Calibration - 3 points Show GLP Data Start/Exit Calibration RANGE Store Log Data Select pH Buffer Confirm Calibration Recall Log Data in selected pH Buffer Select pH/ORP/ mV/Ion...

  • Page 5: Hi 253 Specifications

    HI 253 SPECIFICATIONS 2 – – 2 – ± ± 9 – C º ± ± C º ± ± ± ± ± ± ± / C ° F ° ± . s . f ± C º c x e d u l g n i o r p...
  • Page 6 HI 253 SPECIFICATIONS (cont. ) t n i b i l i t a r , n o n o I b i l t a r n o i r e f f a l i e l b , 1 .

  • Page 7: Operational Guide

    OPERATIONAL GUIDE POWER CONNECTION Plug the 12 VDC adapter into the power supply socket. Note: This instrument uses non volatile memory to retain the pH, mV, temperature calibrations and all other settings, even when unplugged. Note: 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 8 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. The pH reading is affected by temperature. In order to measure the pH accurately, the temperature effect must be compensated for.

  • Page 9: Temperature Measurements

    RELATIVE mV MEASUREMENTS • Press RANGE until “rEL” message will be displayed on the secondary LCD line for about one second and “mV” tag will blink. After one second the temperature will be displayed on the secondary LCD. The reading displayed by the instrument is equal to the difference between the current mV input value and relative mV offset established in the relative mV calibration.

  • Page 10: 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 week. • 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 34).
  • Page 11 • The “ ” tag will blink on the LCD until the reading is stable. • When the reading is stable and close to the selected buffer, the “READY” tag will be displayed and the “CFM” tag will blink. • Press CFM to confirm calibration. •...
  • Page 12 Note: • If the value measured by the instrument is not close to the selected buffer, “WRONG” “ ” and “WRONG” “ ” tags will blink alternately. In this case, check if the correct buffer has been used or regenerate the electrode by following the Cleaning Proce- dure (see page 34).

  • Page 13: Ion Calibration

    ION CALIBRATION For greatest accuracy, it is recommended to calibrate the instrument frequently. Due to electrode conditioning time, the electrode must be kept immersed a few seconds to stabilize. The user will be guided step by step during calibration with easy to follow tags on the display. This will make the calibration a simple and error-free procedure.
  • Page 14 Note: The instrument will automatically skip the buffer used for the first point. • After the first calibration point is confirmed, immerse the ISE electrode approximately 4 cm (1½”) into the second calibration solution. • If necessary, press the ARROW keys to select a different buffer value. •...

  • Page 15: 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 electrode. All data regarding last pH calibration (one, two or three-point) and Ion calibration is stored for the user to review when necessary. This data includes the following: calibration time stamp, offset (mV), average of pH slope (%) or Ion slope (mV), calibration buffers and the time until a new calibration is required (only for pH calibration).
  • Page 16 • 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 pH calibration buffers in calibrating order. The first pH calibration buffer: The second pH calibration buffer: The third pH calibration buffer: Note: •...
  • Page 17 or the number of days until the calibration alarm will be displayed. or if expired (7 days ago). INTV • The instrument ID. LAST ION CALIBRATION DATA Last Ion calibration data is stored automatically after a successful calibration. To view Ion calibration data, press GLP when the instrument is in Ion measurement mode.

  • Page 18: Logging Function

    • The second mV value. BUF 2 • The Ion calibration slope (mV/decade). • The instrument ID. Note: • If a one-point calibration is performed after a two-point calibration, the instrument will keep the old slope. • If “no bUF” message appears on the LCD, the instrument informs you that calibration was performed in only one point.
  • Page 19 If the log space is full, “FULL LOC” message will be displayed and no more data will be saved. When LOG is pressed, a complete set of information is stored: date, time, pH or ppm, mV, temperature and calibration data. VIEW LOGGED DATA Press RCL to retrive the information stored while in measurement mode.
  • Page 20 • The temperature value on the primary LCD and the record number on the secondary LCD. Note: When the pH, mV or temperature is displayed, if SET/CLR is pressed and hold down, the secondary LCD will display the record date. •...
  • Page 21 • The “dEL” message on the primary LCD and the selected record on the secondary LCD, along with ”LOG” tag. Note: • If one of the ARROW keys is pressed while “dEL” and record number is displayed, the next/previous record number is selected. •...

  • Page 22: Setup

    S E T U P Setup mode allows viewing and modifying the following parameters: • Current Time • Current Date • pH Resolution • Ion Charge • Beep Status • Baud Rate (serial communication) • Command prefix (serial communication) • Calibration Alarm Time-Out •...
  • Page 23 CURRENT DATE SET Press CAL when the current date is displayed. The year will start blinking. DATE Press the ARROW keys to change the year. Press RANGE. The month will start blinking. DATE Press the ARROW keys to change the month. Press RANGE.
  • Page 24 Press the ARROW keys to change the ion charge. Note: To select the right ion charge, different ion types and their charge are presented in the table below. p y t 2 – a v i n e l o i n ) s n 1 –...
  • Page 25 SERIAL COMMUNICATION COMMAND PREFIX SET Press CAL when the command prefix is displayed. The command prefix (0 to 47) will start blinking. Press the ARROW keys to change the command prefix. Press CFM to save the modified command prefix value. Press CAL to escape without saving.

  • Page 26: Temperature Calibration (For Technical Personnel Only)

    TEMPERATURE CALIBRATION (for technical personnel only) All the instruments are factory calibrated for temperature. Hanna’s temperature probes are interchangeable and no temperature calibration is needed when they are replaced. If the temperature measurements are inaccurate, temperature recalibration should be performed. For an accurate recalibration, contact your dealer or the nearest Hanna Customer Service Center, or follow the instructions bellow.

  • Page 27: Mv Calibration (For Technical Personnel Only)

    • Use the ARROW keys to set the reading on the secondary LCD to that of the hot water. • When the reading is stable and close to the selected calibration point, “READY” tag will appear and “CFM” tag will blink. •...

  • Page 28: Relative Mv Calibration

    Note: • If the reading is not close to the selected calibration point, “WRONG” tag will blink. Verify calibration condition or contact your vendor if you can not calibrate. • Press CAL in any moment of the calibration process. The instrument will return to measurement mode.

  • Page 29: Pc Interface

    Note: • Other cables than HI 920010 may use a different configuration. In this case communication between instrument and PC may not be possible. • If you are not using Hanna Instruments HI 92000 software, please see the following instructions. SENDING COMMANDS FROM PC It is also possible to remotely control the instrument with any terminal program.
  • Page 30 CHR n Change the instrument range according with the parameter value (n): • n=0 pH range/0.001 resolution • n=1 pH range/0.01 resolution • n=2 pH range/0.1 resolution • n=3 mV range • n=4 Relative mV range • n=5 Ion range COMMANDS REQUIRING AN ANSWER Causes the instrument to send the pH reading.

  • Page 31: Ph Values At Different Temperatures

    pH VALUES AT DIFFERENT TEMPERATURES 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. C º...

  • Page 32: Electrode Conditioning & Maintenance

    E L E C T R O D E C O N D I T I O N I N G & 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.
  • Page 33 For refillable electrodes: If the filling solution (electrolyte) is more than 2½ cm (1”) below the fill hole, add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction or HI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte Solution for single junction electrodes.
  • Page 34 CLEANING PROCEDURE • General Soak in Hanna HI 7061 or HI 8061 General Cleaning Solution for approximately ½ hour. • Protein Soak in Hanna HI 7073 or HI 8073 Protein Cleaning Solution for 15 minutes. • Inorganic Soak in Hanna HI 7074 Inorganic Cleaning Solution for 15 minutes.

  • Page 35: Troubleshooting Guide

    T R O U B L E S H O O T I N G G U I D E w o l p e r / e s c x e s s e e v i y t r i c e l o r t .

  • Page 36: Temperature Correlation For Ph Sensitive Glass

    TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS The resistance of glass electrodes partially depends on the temperature. The lower the temperature, the higher the resistance. It takes more time for the reading to stabilize if the resistance is higher. In addition, the response time will suffer to a greater degree at temperatures below 25 ºC.

  • Page 37: Accessories

    A C C E S S O R I E S pH BUFFER SOLUTIONS HI 70004P pH 4.01 Buffer Sachets, 20 mL, 25 pcs HI 70007P pH 7.01 Buffer Sachets, 20 mL, 25 pcs HI 70010P pH 10.01 Buffer Sachets, 20 mL, 25 pcs HI 7001L pH 1.68 Buffer Solution, 500 mL HI 7004L pH 4.01 Buffer Solution, 500 mL HI 7006L pH 6.86 Buffer Solution, 500 mL...
  • Page 38 ORP PRETREATMENT SOLUTIONS HI 7091L Reducing Pretreatment Solution, 460 mL HI 7092L Oxidizing Pretreatment Solution, 460 mL pH ELECTRODES All electrodes part numbers ending in B are supplied with a BNC connector and 1 m (3.3') cable, as shown below : HI 1043B Glass-body, double junction, refillable, combination pH electrode.
  • Page 39 HI 1330B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory, vials. 5mm DIA 0.2" 0.2" HI 1330 120 mm 4.7" "S" VERSION HI 1331B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: flasks. HI 1310 8 mm 7.5mm DIA 0.3"...
  • Page 40 FC 100B ® Plastic-body (Kynar ), double junction, refillable, combination pH electrode. Use: general purpose for food industry. 12 mm 0.5" FC 100 120 mm 4.7" FC 200B Plastic-body (Kynar ® ), open junction, conic, Viscolene, non-refillable, combination pH electrode. Use: meat & cheese. 6 mm 0.25"...
  • Page 41 HI 1413B Glass-body, single junction, flat tip, Viscolene, non-refillable, combination pH electrode. Use: surface measurement. 12 mm 0.5" HI 1413 110 mm 4.3" ORP ELECTRODES HI 3131B Glass-body, refillable, combination platinum ORP electrode. Use: titration. 12 mm 0.5" HI 3131 150 mm "S"...
  • Page 42 EXTENSION CABLE FOR SCREW-TYPE ELECTRODES (SCREW TO BNC ADAPTER) HI 7855/1 Extension cable 1 m (3.3') long HI 7855/3 Extension cable 3 m (9.9') long HI 7855 SERIES CABLE CONNECTORS CONNECTOR AND 3.0 mm (0.12") CABLE WITH BNC CONNECT TO THE CONNECT TO BNC SOCKET SCREW TYPE...
  • Page 43 RECOMMENDATIONS FOR USERS Before using this product, make sure that it is entirely suitable for the environment in which it is used. Operation of this instrument in residential areas could cause unacceptable interferences to radio and TV equipment, requiring the operator to follow all necessary steps to correct interferences.
  • Page 44 SALES AND TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769.0666 • Fax (03) 9769.0699 China: Tel. (10) 88570068 • Fax (10) 88570060 Egypt: Tel. & Fax (02) 2758.683 Germany: Tel. (07851) 9129-0 • Fax (07851) 9129-99 Greece: Tel. (210) 823.5192 • Fax (210) 884.0210 Indonesia: Tel.

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