Hanna Instruments HI 2550 User manual

1
www.hannainst.com
Multiparameter
pH/ORP/°C
EC/TDS/NaCl
Bench Meter
HI 2550
Instruction Manual

2
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
WARRANTY .................................................................................................... 2
PRELIMINARY EXAMINATION ............................................................................ 3
GENERAL DESCRIPTION .................................................................................... 3
FUNCTIONAL DESCRIPTION .............................................................................. 4
SPECIFICATIONS ............................................................................................. 5
OPERATIONAL GUIDE ....................................................................................... 7
AUTO-RANGING ............................................................................................. 12
pH CALIBRATION ............................................................................................ 13
pH BUFFER TEMPERATURE DEPENDENCE .........................................................18
RELATIVE mV CALIBRATION .............................................................................. 19
ECS/TDS CALIBRATION .................................................................................... 19
CONDUCTIVITY VERSUS TEMPERATURE CHART ...................................................21
NaCl CALIBRATION ......................................................................................... 22
GOOD LABORATORY PRACTICE (GLP) .................................................................23
LOGGING FUNCTION ....................................................................................... 28
SETUP ..........................................................................................................36
TEMPERATURE CALIBRATION (FOR TECHNICAL PERSONNEL ONLY) ....................... 42
mV CALIBRATION (FOR TECHNICAL PERSONNEL ONLY) ....................................... 44
PC INTERFACE ............................................................................................... 45
ELECTRODE CONDITIONING & MAINTENANCE .................................................... 51
TROUBLESHOOTING GUIDE .............................................................................. 54
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ..................................... 55
ACCESSORIES ............................................................................................... 56
WARRANTYWARRANTY
WARRANTYWARRANTY
WARRANTY
HI 2550 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.
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.
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 [email protected].

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GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
The HI 2550 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 HI 7662 temperature probe.
Up to a five-point pH calibration can be performed using seven standard
buffers and two custom buffers.
A calibration due alarm can be set to alert the user that too much time
has elapsed since the last pH calibration.
Conductivity and TDS features auto-ranging, which automatically selects
the scale with the highest resolution. Conductivity measurements are
compensated for temperature manually or automatically with a
temperature sensor located inside the probe. The temperature coefficient
is user selectable. Temperature compensation can be disabled to measure
actual conductivity.
The GLP feature provides data consistency.
Data can be stored in the meters memory for later retrieval. The meters
memory can hold 200 manually logged points and 500 lot logging
points.
An USB connection ensures communication with a PC.
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully
to make sure that no damage has occurred during shipping. If there is any
damage, notify your Dealer or the nearest Hanna Customer Service Center.
Each instrument is supplied with:
•HI 1131B Glass-body Combination pH Electrode with 1 m (3.3')
Cable
•HI 76310 Conductivity / TDS probe
•HI 7662 Temperature Probe
•HI 76404N Electrode Holder
•pH 4.01 & 7.01 Buffer Solutions (20 mL each)
•HI 7071 Electrolyte Solution
• 12VDC 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 the
original packing with the supplied accessories.

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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.
4) ºC key, to manually increase temperature value or other parameters.
TC key (alternate function), to view temperature coefficient value.
5) ºC key, to manually decrease temperature value or other parameters.
ATC key (alternate function), to select EC temperature compensation mode.
6) SETUP key, to enter/exit SETUP mode.
LOCK key (alternate function), to freeze current EC range on the LCD.
7) RANGE key, to select measurement range (pH, mV, EC), switch to
focused data in SETUP or toggle between buffer value and temperature
during calibration.
MODE key (alternate function) to select mV or Rel mV on mV range
or EC, TDS, NaCl on EC range.
8) LOG/CLR key, to store a value into memory, to clear pH calibration,
or to select to delete log records or lots.
9) ALT key, to select alternate function.
10) ON/OFF switch.
11) Power supply socket.
12) USB connector.
13) EC electrode connector.
14) BNC electrode connector.
15) Temperature probe socket.
16) Electrode reference socket.
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
Front Panel
Rear Panel

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SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
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7
3 cm
(1¼")
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
POWER CONNECTIONPOWER CONNECTION
POWER CONNECTIONPOWER CONNECTION
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 CONNECTIONSELECTRODE AND PROBE CONNECTIONS
ELECTRODE AND PROBE CONNECTIONSELECTRODE AND PROBE CONNECTIONS
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.
For electrodes with a separate reference connect the electrode’s BNC to the
BNC connector and the reference electrode plug to the reference socket.
For temperature measurements and automatic temperature compensation
connect the temperature probe to the appropriate socket.
For EC/TDS measurements connect the probe to the 7-pin connector.
Make sure the probe sleeve is properly inserted.
INSTRUMENT STINSTRUMENT ST
INSTRUMENT STINSTRUMENT ST
INSTRUMENT STARTART
ARTART
ART-UP-UP
-UP-UP
-UP
• Turn the instrument on by pressing the ON/OFF switch located on
the rear panel.
• All LCD tags are displayed and a beep is sounded while the
instruments perform a self test.
• The instrument will display “LoAd” message and “ ” blinking until
initialization is complete.
Notes: •The instrument starts in the same range and mode as it was
at power off.
•The ALT&MODE keys change the measuring modes:
- mV or Rel mV
- EC or TDS or NaCl
•The RANGE key toggles between measurement ranges:
- pH, mV or Rel mV, EC or TDS or NaCl.
pH MEASUREMENTS
Make sure the instrument has been calibrated before
taking pH measurements.
• Submerse the electrode tip and the temperature
probe approximately 3 cm (1¼”) into the sample
to be tested and stir gently. Allow time for the
electrode to stabilize.

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3 cm
(1¼")
• 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.
Ifmeasurements 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. To use the
Automatic Temperature Compensation feature, connect and submerse
the HI 7662 temperature probe into the sample as close as possible to
the electrode and wait for a few seconds.
If the temperature of the sample is known, manual temperature
compensation can be used by disconnecting the temperature probe.
The display will show the last temperature reading with
the “ºC” tag blinking.
The temperature can now be adjusted with the ARROW
keys (from –20.0 ºC to 120.0 ºC).
mV/ORP MEASUREMENTSmV/ORP MEASUREMENTS
mV/ORP MEASUREMENTSmV/ORP MEASUREMENTS
mV/ORP MEASUREMENTS
An optional ORP electrode must be used to perform ORP measurements
(see Accessories).
Oxidation-Reduction Potential (REDOX) measurements provide the
quantification of the oxidizing or reducing power of the tested sample.
The surface of the ORP electrode must be clean and smooth in order to
obtain an accurate measurement.
• Press RANGE to enter mV range.
• Submerse the tip of the ORP electrode (3 cm/1¼”)
into the sample to be tested and allow a few
seconds for the reading to stabilize.
pH
pH

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• The instrument displays the mV reading on the primary LCD and the
temperature on the secondary LCD line.
• If the reading is out of range, the closest full-scale value will be
displayed blinking on the primary LCD.
RELATIVE mV MEASUREMENTSRELATIVE mV MEASUREMENTS
RELATIVE mV MEASUREMENTSRELATIVE mV MEASUREMENTS
RELATIVE mV MEASUREMENTS
• Press the ALT&MODE keys simultaneously while in mV range. The
“rEL” and “mV” tags are displayed for about one second. After one
second the temperature will be displayed on the secondary LCD and
the “mV” tag will blink.
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.
CONDUCTIVITY MEASUREMENTSCONDUCTIVITY MEASUREMENTS
CONDUCTIVITY MEASUREMENTSCONDUCTIVITY MEASUREMENTS
CONDUCTIVITY MEASUREMENTS
Connect the conductivity probe to the instrument.
• Press the RANGE key to enter conductivity measurement range (EC).
• Submerse the probe into the solution to be tested. The
sleeve holes must be completely submersed. Tap the
probe repeatedly to remove any air bubbles that may
be trapped inside the sleeve.
• The conductivity value will be displayed on the primary
LCD and the temperature on the secondary LCD.
• If the reading is out of range, the full-scale value (200.0 for MTC/ATC
mode or 500.0 for actual conductivity) will be displayed blinking.
mV
mV
mV

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• If LOCK key was pressed and the reading goes out of range, the
full-scale value of the frozen range will be displayed blinking.
The conductivity reading is affected by temperature.
Three options for temperature compensation are available in conductivity
measurement mode.
Automatic (ATC): The conductivity probe has a built-in temperature
sensor; the temperature value is used to automatically compensate the
EC/TDS reading.
Manual (MTC): The temperature value, shown on the secondary LCD,
can be manually set with the ARROW keys. The “ºC” tag blinks when
this option is active. This value will be used to compensate the EC/TDS
reading.
No Compensation (notc): The temperature value is displayed, but not
taken into account. When this option is selected the “ºC” tag will blink
with slower frequency. The reading displayed on the primary LCD is the
uncompensated EC or TDS value.
To select the desired option, press the
ALT&ATC keys until the option is displayed
on the LCD.
Notes:•The default compensation mode is ATC.
•If no temperature probe is detected, ATC mode can not be
selected and the instrument displays “----” on the secondary LCD.
If temperature compensation is selected, measurements are compensated
using the temperature coefficient (default value 1.90 %/ºC). To change
the temperature coefficient, enter the setup mode and select “tc” (see
SETUP for details, page 36). The current temperature coefficient can be
quickly viewed by pressing the ALT&TC keys. The value is briefly
displayed on the secondary LCD.
• If the temperature reading exceeds the limits of the meter (–20.0 ºC
to 120.0 ºC), the “ºC” tag will blink and the closest full scale value
will be displayed.