Hanna Instruments HI 504920 User Manual
Instruction Manual
HI 504920
Remote User Interface
pH Meter
www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna Instruments Product.
Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information
for correct use of the instrument.
If you need additional technical information, do not hesitate to e-mail
us at tech@hannainst.com.
This instrument is in compliance with directives.
WARRANTY
All Hanna Instruments meters are warranted for two years against defects in
workmanship and materials when used for their intended purpose and maintained
according to instructions. Probes are warranted for a period of six months. This
warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed maintenance are
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 failure. 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 Customer Service
department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection.
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.
Each meter is supplied complete with:
• HI 62920 amplified pH electrode with built-in temperature
sensor, DIN connector and 2 m cable
• Hanna HI 504910 interface cable (HI 7920)
• pH 4.01 buffer solution, 20 mL sachet
• pH 7.01 buffer solution, 20 mL sachet
• Instruction manual
• 1.5V AA size alkaline batteries (4 pcs)
• 12 Vdc power adapter
• Rugged carrying case.
Note: Save all packing material until you are sure that the
instrument functions correctly. All defective items must be
returned in their original packaging together with the supplied accessories.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION ..................................................................... 3
GENERAL DESCRIPTION ........................................................................... 3
FUNCTIONAL DESCRIPTION .......................................................................5
SPECIFICATIONS .................................................................................. 6
INITIAL PREPARATION .............................................................................. 7
CALIBRATION ..................................................................................8
pH CALIBRATION PROCEDURE ........................................ 8
mV CALIBRATION PROCEDURE .................................... 1 0
TEMPERATURE CALIBRATION PROCEDURE .................... 10
USE AS REFERENCE pH METER .............................................................. 11
SETUP MODE ............................................................................... 14
TAKING MEASUREMENTS ...................................................................... 17
GOOD LABORATORY PRACTICE (GLP) ..................................................... 19
BATTERY REPLACEMENT ....................................................................... 21
TEMPERATURE-RESISTANCE CORRELATION
FOR HANNA PH SENSITIVE GLASS .......................................................... 2 2
ELECTRODE CONDITIONING AND MAINTENANCE ...................................... 23
ACCESSORIES ...................................................................................... 2 5
CE DECLARATION OF CONFORMITY ........................................................ 27
GENERAL DESCRIPTION
HI 504920 is a complete portable pH/ORP/temperature meter, to be
used mainly with Hanna HI 504910 Digital Transmitter for two
different applications: it can be a reference pH meter for calibrating
the HI 504910 Digital Transmitter, or it can be set as user interface
for the HI 504910 as well.
All pH measurements are automatically compensated for temperature
(ATC). The instrument housing is made of rugged, lightweight material,
making it truly portable.
Five memorized buffers (4.01, 6.86, 7.01, 9.18 and 10.01 pH) and
wrong buffer recognition technology make calibration simple and error
free. One or two-point calibration can be performed.
An user friendly interface provides clear messages regarding errors,
functions and more.
An alarm time-out is available to alert the user if too much time has
elapsed since the last pH calibration and that re-calibration may be
required.
The meter provides a controlled access to calibration and GLP settings
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through a password protection method.
The Battery Error Preventing System (BEPS) detects when the batter-
ies level becomes weak.
When the batteries are getting low, a clear indication is displayed on
LCD to warn the user of this condition. However, the meter continues
to measure correctly even when the low battery indication is displayed. The meter automatically switches itself off when the batteries
are too weak to support proper function.
For long term field and lab applications, this meter can be connected to
a 12 VDC adapter.
The meter allows the user to enter an ID code to uniquely identify the
instrument.
Made of lightweight ABS material, the water-resistant rugged casing
is built to last.
The meter is in compliance with IP67 standards: dust-tight, protected
against the effects of temporary immersion in water and designed to
provide laboratory results and accuracy under harsh industrial conditions.
FUNCTIONAL DESCRIPTION
1) Power adapter plug
2) Connector for the HI 504910 interface cable (HI 7920)
3) Electrode Connector
4) Liquid Crystal Display (LCD)
5) ON/OFF key, to turn the meter on and off
6) ALT key, to alternate key function
7) DISPLAY / CAL DATA key, to select measurement ranges, to
display time and date, and to view calibration data (with ALT)
8) CFM key, to confirm values
9) CALT key, to move down or calibrate temperature (with ALT)
10) CAL key, to move right or calibrate pH (with ALT)
11) SETUP key, to move up or enter setup mode (with ALT)
12) TXCAL key, to calibrate the HI 504910 Digital Transmitter
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SPECIFICATIONS
INITIAL PREPARATION
Range pH -4.00 to 19.99 pH
mV ±600.0 mV ; ±2000 mV autoranging
Temp. -20 to 120 °C
Resolution pH 0.01 pH
mV 0.1 mV between ±400 mV
0.2 mV from +400 to +600 mV
0.2 mV from -400 to -600 mV
1 mV outside
Temp. 0.1 °C from -10 to 120 °C / 1°C below -10°C
Accuracy pH ±0.01 pH
(@20°C/68°F) mV ±0.2 mV between ±400 mV
±0.4 mV from +400 to +600 mV
±0.4 mV from -400 to -600 mV
±2 mV outside
Temp. ±0.4 °C from 0 to 70°C / ±1°C outside
Typical EMC pH ±0.02 pH
Deviation mV ±1 mV between ±600 mV
±2 mV outside
Temp. ±0.4°C
pH Calibration Automatic 1 or 2 points with 5 memorized
buffers (4.01, 6.86, 7.01, 9.18 and 10.01 pH)
mV Calibration Automatic 2 points at 0, 350 mV or 3 points
at 0, 350 and 1900 mV
Temperature Automatic from -20 to 120°C
Compensation
pH Electrode HI 62920 Amplified, with built-in temperature
sensor, matching pin, DIN connector and Titanium body (included)
ORP Electrode Amplified ORP electrode with DIN connector
(see accessories)
Input Impedance 10
12
Ohm
Infrared optical through HI 7920 interface cable
interface towards
HI 504910
Power supply 4x1.5V AA (IEC LR6) batteries/300 hours typical life
or 12 VDC adapter
Casing IP 67
Environment 0 to 50°C / 100% RH
Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4")
Weight 500 g (18 oz)
Each meter is supplied complete with batteries and 12 VDC adapter.
To power the instrument with batteries, remove the back cover,
unwrap the batteries and install them while paying attention to the
polarity.
If using external power supply, connect the 12 VDC adapter to the
power adapter plug.
To prepare the instrument for use, connect the pH or ORP electrode to
the connector located on the top of the instrument.
To switch the meter on, press the ON/OFF key.
The batteries charge status or "LINE" message
(if external power adapter is connected) will be
displayed on the LCD for a few seconds.
The meter is now ready to operate.
To maximize battery life, the meter is automatically switched off after 5
minutes of non-use (this feature can be disabled through setup code
20). To reactivate the instrument press the ON/OFF key.
Before proceeding with pH measurements follow the calibration proce-
dure.
Note: When the use of an alternate function (SETUP, CAL, CAL DATA
and CALT) is requested, press and hold the ALT key first and
then the second desired key.
Note: To prevent damage to the electrode, remove it from the sample
before turning the meter off.
When the meter is OFF, detach the electrode from the meter
before immersing it in the storage solution.
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CALIBRATION
pH CALIBRATION
For greatest accuracy, it is recommended to frequently calibrate the
instrument. For a faster procedure, it is possible to calibrate at 1
point, but it is always a good practice to calibrate at 2 points.
For a two-point calibration two of the following pH buffers can be
used: pH 4.01, pH 7.01 (or 6.86), pH 10.01 (or 9.18).
In the case of a two-point calibration in the acidic range (from 0 to
7 pH), use pH 7.01 (or 6.86) buffer as first solution and pH 4.01
buffer as second solution. If testing in the alkaline range (from 7 to
14 pH), use pH 10.01 (or 9.18) buffer as second solution.
Due to electrode conditioning time, the electrode must be kept
immersed a few seconds to stabilize. The meter is equipped with a
stability indicator and the user will be guided step by step with easy
indications on the LCD during the calibration. This will make the
calibration a simple and error-free procedure.
PROCEDURE
1. Rinse the electrode with a portion of the first calibration buffer or
clean water. Dip the tip (4 cm/1½") of the electrode into a
beaker containing the solution.
2. Press (ALT+) CAL when the meter dis-
plays pH measurement.
3. Enter the password (if different from "0000") with the arrow keys.
4. Press CFM to confirm the password or (ALT+) CAL to exit.
5. If password is correct, the meter displays "7.01pH" on the
secondary LCD with the "BUF 1" and "CAL" indications. The
primary LCD shows the uncalibrated pH reading.
Note: The pH buffer value (displayed on the secondary LCD) varies
with temperature. For example, at 20°C it shows 4.00 -7.03 -
10.06, at 25°C it shows 4.01-7.01-10.01.
6. Select the first buffer solution value with or if necessary.
7. When the "CFM" symbol blinks, the read-
ing is stable and calibration can be
confirmed.
8. Press CFM to confirm the first buffer.
9. If everything is satisfactory the LCD will
display "Stor" and then the expected
value for the second buffer (two-point
calibration). If a wrong solution or electrode has been used or if the buffer is
polluted, "WRONG" will be displayed to
alert the user.
10. If a single point calibration is required,
press (ALT+) CAL to exit the calibration
mode and maintain the previous slope
calibration. The instrument then checks
the electrode parameters and advises user
of possible abnormalities by "old probe"
and "dead probe" indications.
11. Press or to select the second buffer value. The meter will
display the "BUF 2" indication.
12. Rinse the electrode with some of the second buffer solution or clean
water.
13.Dip the tip (4 cm/1½") of the pH electrode into a beaker
containing the second buffer.
14. When the "CFM" symbol blinks, press CFM
to confirm the second calibration point.
15. The LCD will display "Stor". The instrument checks the electrode
parameters and advises the user of possible abnormalities by "old
probe" and "dead probe" indications (in these cases, repeat the
calibration procedure with fresh buffers). If everything is satisfactory
the meter is calibrated and it returns to normal operational mode.
Note: To abort the calibration procedure and leave the calibration data
unchanged, press ALT and CAL before confirming the first point.
CALIBRATION ERROR MESSAGES
If the "old probe" or "dead probe" messages are displayed, or if the
WRONG tag blinks during calibration, check the electrode by following
the conditioning and maintenance procedures and repeat calibration.
If calibration can not be successfully performed, the pH electrode
might have to be replaced.
Note: See "GLP" section for more details about "old probe" and "dead
probe" messages.
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