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HI 2400
User Manual
20 pgs912.9 Kb0
User Manual
32 pgs869 Kb0
User Manual
28 pgs352.7 Kb1

Hanna Instruments HI 2400 User Manual

Instruction Manual
HI 2400
Dissolved Oxygen
Bench Meter
www.hannainst.com
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. If you need additional technical information, do not hesitate to e-mail us
at tech@hannainst.com.
WARRANTYWARRANTY
WARRANTY
WARRANTYWARRANTY
HI 2400 is guaranteed for two years against defects in workmanship and materials when used for its 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.
Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered.
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 problem. 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 Technical Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packed for complete protection.
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
DO CALIBRATION ............................................................................................ 10
GOOD LABORATORY PRACTICE (GLP) ................................................................. 13
SETUP .......................................................................................................... 14
LOGGING ....................................................................................................... 19
TEMPERATURE CALIBRATION (for technical personnel only) ................................. 22
PC INTERFACE ............................................................................................... 24
PROBE & MEMBRANE MAINTENANCE ............................................................... 28
TROUBLESHOOTING GUIDE .............................................................................. 29
ACCESSORIES ............................................................................................... 30
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PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure that no damage has occured during shiping. If there is any damage, notify your Dealer or the nearest Hanna Customer Service Center.
Each instrument is supplied with:
• HI 76407/2 DO probe with 2 m (6.7') cable
• HI 76407A membrane cap (2 pcs)
• HI 7041S electrolyte solution (30 ml)
• 12 VDC power adapter
• Instruction Manual
Note: Save all packing material until you are sure that the instrument
functions correctly. All defective items must be returned in their original packing with the supplied accessories.
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
HI2400 is a logging microprocessor-based DO/Temperature bench meter. It can store up to 100 lots in memory, with up to 8000 readings. These
readings can be transferred to a computer for further analysis or permanent storage.
Dissolved Oxygen is indicated in ppm (parts per million) or in %. All measurements are automatically compensated for temperature.
Salinity compensation in water allows direct determination of Dissolved Oxygen in saline waters and altitude compensation readjusts for the altitude variance.
The Dissolved Oxygen probe has a membrane covering the polarographic sensors and a built-in thermistor for temperature measurements and compensation.
This permeable PTFE membrane isolates the sensor elements from the testing solution, but allows Oxygen to pass through. When a voltage is applied across the sensor, oxygen that has passed through the membrane reacts causing a current flow, and hence determining a reading.
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1
2
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PROBE FUNCTIONAL DESCRIPTIONPROBE FUNCTIONAL DESCRIPTION
PROBE FUNCTIONAL DESCRIPTION
PROBE FUNCTIONAL DESCRIPTIONPROBE FUNCTIONAL DESCRIPTION
1. DO Probe
2. Protective Cap
3. Watertight Shielded Cable
4. Polypropylene Probe Body
5. Temperature Sensor
6. O-Ring Seal
7. Silver Chloride Anode
8. Platinum Cathode (sensor)
9. Oxygen Permeable PTFE Membrane
10. Membrane Cap
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FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
Front Panel
Rear Panel
1) Liquid Crystal Display (LCD).
2) CAL key, to enter and exit calibration mode.
3) CFM/GLP key, to confirm calibration selection, different setup values
or to display Good Laboratory Practice information.
4) ºC key, to manually increase temperature value or other parameters.
5) ºC key, to manually decrease temperature value or other parameters.
6) SETUP key, to enter/exit SETUP mode.
7) RANGE key, to select measurement range (% or ppm), switch to
focused data in SETUP or toggle between standard value and temperature during calibration.
8) LOG/CLR key, to store a value into memory, or to select to delete log
records.
9) RCL key, to enter and exit view memory mode.
10) ON/OFF switch.
11) Power supply socket.
12) USB connector.
13) DO probe connector.
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SPECIFICATIONSSPECIFICATIONS
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SPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
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Shipping
cap
black
red
FILLFIRST
THENTAP
THENSCREW
BACKON
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
POWER CONNECTION
Plug the 12 VDC adapter into the power supply socket. Notes: • This instrument use non volatile memory to retain the
calibration parameters and all the other settings even when unplugged.
• Make sure a fuse protects the main line.
PROBE CONNECTION AND PREPARATION
To take measurements, connect the DO probe to the meter securely by aligning the pins with the socket located on the back of the meter, pushing the plug in and tightening the threaded ring.
Probes shipped from Hanna Instruments are dry. To hydrate the probe and prepare it for use, connect it to the meter and proceed as follows:
1. Remove the red and black plastic cap. This cap is for shipping purposes and can be thrown away.
2. Wet the sensor by soaking the bottom 2½ cm (1") of the probe in electrolyte (HI 7041S) for 5 minutes.
3. Rinse the membrane cap (HI 76407A supplied in the kit with the meter) with electrolyte solution while shaking it gently. Refill with clean electrolyte solution.
4. Tap gently the sides of the membrane cap with your finger tip to ensure that no air bubbles are trapped. To avoid damaging the membrane, do not tap it directly on the bottom.
5. Make sure that the rubber O-ring sits properly inside the membrane cap.
6. With the sensor facing down, slowly screw the cap clockwise. Some electrolyte will overflow.
When not in use and during polarization (see page 8), use the protective transparent cap supplied in the kit with the meter.
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INSTRUMENT START-UP
• Turn the instrument on by pressing the ON/OFF switch.
• All LCD tags are displayed and a beep is generated while the instrument performs a self test.
• The instrument will display “ ” blinking until initialization is complete.
• After a few seconds “Cond” message appears on the LCD to inform the user that the probe is in auto-conditioning (automatic polarization) mode.
• When this message disappears, the probe is polarized and the instrument can be calibrated.
• If the probe is disconnected, the meter will display “----”.
PROBE POLARIZATION
The probe is under polarization with a fixed voltage of approximately 800 mV.
Probe polarization is essential for stable measurements with the same recurring degree of accuracy.
With the probe properly polarized, oxygen is continually consumed when it passes through the sensitive diaphragm and dissolves in the electrolyte solution contained in the probe.
If polarization is interrupted, the electrolyte solution continues to be enriched with oxygen until it reaches an equilibrium with the surrounding solution.
Whenever measurements are taken with a non-polarized probe, the oxygen level revealed is both that of the tested solution, as well as that present in the electrolyte solution. This reading is incorrect.
The calibration of this instrument is very simple. Before proceeding with the calibration, make sure the probe is ready for
measurements (see page 7), i.e. the membrane cap is filled with electrolyte and the probe is connected to the meter and properly polarized.
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For an accurate calibration, it is recommended to wait at least 15 minutes to ensure precise conditioning of the probe.
Keep the protective cap on during polarization time and remove it for calibration and measurements. Follow the calibration procedure (see page 10).
SALINITY AND ALTITUDE COMPENSATION
If the sample contains significant concentration of salinity or if you are performing measurements at an altitude different from sea level, the read out values must be corrected, taking into account the lower degree of oxygen solubility in these situations (see pages 15-16).
Remember to set the altitude and/or the salinity before taking any DO measurements. The meter will automatically compensate for these factors.
DO MEASUREMENTS
Make sure that the instrument has been calibrated and the protective cap has been removed.
• Submerse the tip of the probe in the sample to be tested. Allow approximately one minute for the reading to stabilize.
• The Dissolved Oxygen value (in %) is displayed on the primary LCD and the temperature on the secondary LCD.
• Press RANGE to change the reading from % to ppm and vice-versa.
For accurate Dissolved Oxygen measurements, a water movement of
0.3 m/s is required. This is to ensure that the oxygen-depleted
membrane surface is constantly replenished. A moving stream will provide adequate circulation. The use of a magnetic stirrer to ensure a certain fluid velocity is recommended.
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TEMPERATURE MEASUREMENTS
HI 7040
HI 7040
The probe has a built-in temperature sensor. The measured temperature is indicated on the secondary LCD as shown above. Allow the probe to reach thermal equilibrium before taking any measurement. This can take several minutes. The greater the difference between the temperature at which the probe was stored and the temperature of the sample, the longer the time will be. Note: If “----” is displayed, the DO probe is not properly connected. This
also indicates the posibility of a broken probe cable. If temperature displayed blinking, the temperature is out of range.
DO CALIBRATIONDO CALIBRATION
DO CALIBRATION
DO CALIBRATIONDO CALIBRATION
Calibrate the instrument frequently, especially if high accuracy is required.
The instrument can be calibrated in maximum 2 points: 0.0% (zero calibration) and 100.0% (slope calibration).
The zero calibration of the HI 2400 is very stable, therefore this procedure needs to be performed only whenever the probe or the membrane is replaced.
However, because the slope calibration is more critical, it is recommended to perform this procedure every week.
INITIAL PREPARATION
• Pour small quantities of HI 7040 Zero Oxygen solution into a beaker. If possible, use a plastic beaker to minimize any EMC interferences.
• Make sure the probe is ready for measurements (see probe preparation on page 7), i.e. the membrane is filled with electrolyte and the probe is connected to the meter.
• Switch the meter on by pressing the ON/OFF switch.
• For an accurate calibration, it is recommended to wait for at least 15 minutes to ensure precise conditioning of the probe.
• Remove the protective cap from the DO probe.
• Set the appropriate altitude factor (see page 15). Make sure the salinity factor is set to zero (see page 16).
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