Hanna Instruments HI 504910 User Manual
HI 504910
Digital Transmitter
Instruction Manual
TABLE OF CONTENTS
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . 5
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 5
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . 6
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CALIBRATION MODE . . . . . . . . . . . . . . . . . . . . . . 12
SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
MEASURE MODE . . . . . . . . . . . . . . . . . . . . . . . . . 28
ERRORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
pH/ORP PROBE CHECK . . . . . . . . . . . . . . . . . . . . 30
TEMPERATURE COMPENSATION . . . . . . . . . . . . . . 31
LAST CALIBRATION DATA . . . . . . . . . . . . . . . . . . . . 32
OFFSET AND SLOPE DIRECT SELECTION . . . . . . . . 34
EVENT LOG FILE SCROLLING . . . . . . . . . . . . . . . . 36
FAULT CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . 38
RS485 COMMUNICATION. . . . . . . . . . . . . . . . . . . 39
MODEM CONNECTION . . . . . . . . . . . . . . . . . . . . 50
SELFTEST PROCEDURES . . . . . . . . . . . . . . . . . . . . . 53
pH VALUES AT VARIOUS TEMPERATURES. . . . . . . . . 56
ELECTRODE CONDITIONING AND MAINTENANCE . . 57
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
CE DECLARATION OF CONFORMITY. . . . . . . . . . . 65
USER NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Dear Customer,
Thank you for choosing a Hanna Product.
Please read this instruction manual carefully before using the
instrument. It will provide you with the necessary information
for correct use of the 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.
This instrument is in compliance with the
directives.
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 noticeable damage, notify
your Dealer or the nearest Hanna Customer Service Center
immediately.
Note Save all packing materials until you are sure that the instru-
ment functions correctly. Any damaged or defective items must
be returned in their original packing materials together with
the supplied accessories.
WARRANTY
The HI 504910 meter is warranted for two years (sen-
sors, electrodes and probes for six months) against defects in
workmanship and materials when used for their intended purpose and maintained according to instructions. This warranty
is limited to repair or replacement free of charge.
Damage due to accidents, 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.
© 2003 Hanna Instruments
All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner.
Hanna Instruments reserves the right to modify the design,
construction and appearance of its products without advance
notice.
GENERAL DESCRIPTION
HI 504910 acquires and transmits in a digital format towards HI 504 controller, or a computer workstation, pH,
ORP and °C measurements.
The digital link allows to send additional information, especially regarding the pH, ORP and temperature probes.
MAIN FEATURES
• pH/ORP probe check.
• Pt100 or Pt1000 sensor with automatic recognition and damage test.
• Setup procedure to configure general and measurement related
parameters. There are two separate sets of configuration parameters, one for pH and one for ORP, thus no loss of setting occurs
when changing from pH to ORP and vice versa.
• Calibration: usual pH calibration at 2 points, or quick single
point pH calibration through HI 504920 reference pH meter.
• Old probe check, dead probe check, last calibration data internally recorded: calibration date and time, pH offset, pH slope,
number of calibration points and correspondent pH values.
• Manual temperature compensation available (automatically selected when a temperature input error occurs).
• Possibility of a remote connection to a computer workstation through an external modem/GSM module.
• Data logging: 6000 samples pH/°C or ORP downloadable
through RS485 and HI 92500 application software.
4 5
FUNCTIONAL DESCRIPTION
Keyboard and LCD for HI 504910 are normally provided
by HI 504920. To do this, HI 504920 has to be put
into terminal mode, by selecting code 90 in Setup
mode.
If the HI 504920 meter is not handy, the keyboard and
LCD inside the transmitter case can be used for configuring, calibrating and monitoring HI 504910.
1. Infrared optical interface for HI504920
2. Cable glands for 24 VDC power supply, for HI504
or computer workstation connection, for pH (or
ORP) electrode & temperature probe inputs
3. Cable gland for Matching Pin connection
4. Power supply input (24V AC/DC)
5. RS485 connections to HI504, PC, modem, GSM
module
6. Connections for Pt100/Pt1000 temperature sensor
7. Connection for Potential Matching Pin
8. Connection for electrode reference
9. Connection for pH or ORP electrode input
10. Protecting shield: remove to access connectors;
reattach after wiring.
11. Green status LED
12. Red status LED
6 7
1. Liquid Crystal Display
2. ON/OFF key, to turn the HI 504920 on and off.
3. ALT key, to activate alternate key functions
4. DISPLAY / CAL DATA key, to enter/exit the event scrolling mode, to view pH
buffer or °C while calibrating pH, and to view last calibration data (with ALT)
5. TXCAL key, for quick single point pH calibration
6. æ SETUP key, to move up or enter/exit the Setup mode (with ALT)
7. CAL key, to move right or enter/exit the calibration mode (with ALT)
8. CALT key, to move down (no alternate function for HI 504910)
9. CFM key, to confirm values.
The device can be restarted at any time by pressing CFM,
ALT and æ SETUP together (CFM first)
Note Throughout this manual every reference to keyboard or LCD
refers to HI 504920 keyboard and LCD.
When using the HI 504910 internal keyboard and LCD,
refer to the below table to match keys.
SPECIFICATIONS
Range -2.00 to 16.00 pH
-2000 to 2000 mV
-30 to 130.0 ºC
HI 504920 HI 504910
DISPLAY DISPLAY
(ALT+) CAL DATA CAL DATA
(ALT+) SETUP SETUP
ææ
(ALT+) CAL CAL
CFM CFM
The two LCD’s have the same appearance; the only difference is the LOG tag blinking on the HI 504920 display to
indicate that the meter is operating in terminal mode.
Resolution 0.01 pH
1 mV
0.1 ºC
Accuracy ±0.02 pH
(@20°C/68°F) ±2 mV
±0.5 ºC
Typical EMC Deviation ±0.2 pH
±10 mV
±0.5 ºC
Temperature compensation Automatic or manual from -30 to 130 ºC
Temperature probe With 3-wire or 2-wire Pt100/Pt1000 sensor
(with automatic recognition and damage test)
Installation Category II
Power Supply 24V AC/DC ± 20%
Power Consumption 5 VA
Over Current Protection 400 mA 250V FAST FUSE
Infrared optical interface RS232, baud rate fixed to 2400
towards HI 504920
Data logging 6000 pH/ºC or ORP samples
Environment 0 to 50 ºC; max 85% RH non-condensing
Enclosure Fiberglass NEMA case 4X type
Dimensions 216 x 165 x 108 mm (8.5 x 6.5 x 4.25’’)
excluding mounting feet
Weight 1.5 kg (3.3 lb.)
8 9
INSTALLATION
Note The serial interface of the HI 504910 Digital Transmitter is
Note The instrument automatically recognizes the sensor type (Pt100
• Remove the connectors protecting shield and wire the meter
as explained below.
• Power supply input (24V AC/DC): connect a 2-wire power
cable (with a minimum cross area of 0.75 mmq) to the
terminals #1 and #2.
If using a DC supply, connect the positive wire to the terminal #1.
• RS485 serial interface (for communicating with HI 504
controller or PC/modem/GSM module): connect a twisted
shielded cable to terminals #3 (B) and #4 (A).
optoisolated. Do not connect the serial cable shield to the
transmitter.
• Pt100/Pt1000 terminals: use these contacts to connect
the Pt100/Pt1000 temperature sensor for automatic temperature compensation of pH measurement.
In the case of shielded wire, connect the shield to pin #5.
In the case of a 2-wire sensor connect the Pt100/Pt1000 to pins #7
and #8, and short pins #6 and #7
with a jumper wire.
If the Pt100/Pt1000 has more than 2 wires, connect the
two wires of one end to pins #6 and #7 (pin #6 is an
auxiliary input to compensate for the cable resistance) and
one wire from the other end to pin #8. Leave the fourth
wire unconnected, if present.
or Pt1000).
• pH or ORP electrode: connect the
shield of the electrode coaxial cable
(electrode reference) to the terminal
#10, and the electrode coaxial
cable core to terminal #11.
To benefit from the differential (symmetrical) input, connect
the proper electrode wire or a cable with a potential matching pin (grounding bar) to the relevant terminal (#9).
If the matching pin is not available, short pins #9 and #10.
Note All connected cables should end with cable lugs.
Note After wiring, always reat-
tach the protecting shield.
DIMENSIONS
10 11
CALIBRATION MODE
The calibration mode allows to calibrate the pH/ORP and
temperature inputs.
The instrument is factory calibrated for all these parameters.
Periodical calibration of the instrument is recommended, in
particular when greatest accuracy is required and at least biyearly.
The electrode can be calibrated over only one point but,
when possible, it is always good practice to perform a 2point calibration.
QUICK SINGLE-POINT pH CALIBRATION (through HI 504920)
A quick single point pH calibration at the pH value of the
solution monitored by HI 504910 transmitter can be performed. HI 504920 serves as a reference pH meter.
Unlike the usual calibration with buffers, this quick procedure is carried out without having to interrupt normal
measurement.
Note For better accuracy, from time to time it is recommended to
perform a 2-point calibration procedure, which allows to adjust not only the offset but also the slope of the pH probe.
• Connect the HI 504920 meter to HI 504910 through
the infrared interface cable.
• Immerse the pH electrode of the HI 504920 meter into the
solution measured by HI 504910, as close as possible to
the pH probe of HI 504910. Wait a few seconds for stabilization.
• When the HI 504920 meter displays
the pH measurement, press TXCAL (HI
504920 must be out of the HI 504910
terminal mode).
• The LCD will display “CALt” for a couple
of seconds to indicate that the calibration of the HI 504910 transmitter is in
progress.
• If the calibration is completed correctly,
the LCD will flash the “Good” message
for a few seconds. (Also the red LED
flashes once).
Note If the probe offset is outside the allowed limits, if the HI 504910
transmitter is configured for ORP measurement, or if some other
error occurs during calibration, the display will flash a “bAd”
message. Press TXCAL to return to normal mode and restart the
calibration procedure from the beginning.
• The primary LCD will then display the
pH reading of the HI 504910 transmitter, while the secondary LCD will
show the HI 504920 reading. Both pH
tags blink alternatively.
Note The two values may differ a little if the measured solution is
not stable. For an accurate calibration, perform the single
point procedure only when readings are stable.
• To exit the calibration mode, press TXCAL.
Note It is advisable to perform the entire calibration procedure
keeping the HI 504920 meter and the HI 504910 trans-
mitter connected through the infrared optical interface.
• It can happen that HI 504910 is positioned in a difficultto-reach place while the pH probe of HI 504920 is immersed in the solution: the two instruments will be not connected, and when the primary LCD shows the blinking
“CALt” message, the secondary display will show a countdown starting from 120 seconds. In this situation, the pH
probe can be taken out of the solution, while the interface
cable has to be connected to the HI 504910 transmitter
before the countdown reaches zero. Calibration then continues, and at the end of the procedure the pH tag of the
secondary LCD will not blink.
Note If the infrared cable is not connected before the end of the
countdown, the LCD shows the “tiMEout” message and the
calibration is not completed.
Note It is possible to check the HI 504910 pH reading against
the HI 504920 pH reading at any time, without calibrating
the HI 504910 transmitter.
• Press (ALT+) TXCAL.
• The primary display will
show the HI 504910 pH
reading, while the secondary LCD displays the
12 13
HI 504920 pH reading. Both pH tags blink alternatively.
• To return to normal mode, press ALT and TXCAL.
• If a communication error between
the portable meter and the transmitter occurs, the primary LCD shows
the “rSEr” message: check the interface cable and connections.
• If the LCD shows “...”, verify that the HI 504910 transmit-
ter be configured for pH (not for ORP) measurement.
Note Whenever a pH or ORP calibration is performed by means of
HI 504920, the HI 504920 date and time are automatically set in HI 504910.
USING HI 504920 AS TERMINAL FOR HI 504910
Select code 90 in Setup mode and press CFM to confirm.
The HI 504920 enters the Terminal mode and the LOG tag
blinks on the LCD.
Note In this situation it is not necessary to connect the electrode to
the HI 504920 portable meter, which is working as keyboard and LCD for the HI 504910 transmitter.
To enter the calibration mode press
(ALT+) CAL.
The pH calibration can not be performed if the pH electrode
is broken or leaking or the reference electrode is broken or
dirty and an error is active. The ORP calibration can not be
performed if the “Reference electrode broken or dirty” error is
active. The temperature probe should be connected to the
instrument.
Initial Preparation
Pour small quantities of pH 7.01 (HI 7007) and pH 4.01
(HI 7004) or pH 10.01 (HI 7010) solutions into individual
beakers. If possible, use plastic beakers to minimize any EMC
interference.
For accurate calibration use different beakers for each buffer
solution, the first one for rinsing the electrode and the second
one for calibration. By doing this, contamination between
buffers is minimized.
• Enter the calibration mode, select
the pH calibration (by moving
through the menu with the æ and
keys), then press the CFM key.
• Choose the pH buffer set between the two available ones:
the standard set (4.01, 7.01, 10.01) and the NIST set (4.01,
6.86, 9.18). For the standard set confirm the “Std”; for the
NIST set confirm the “niSt” (use the æ and keys for select
between the two options).
Enter the correct password and press the CFM key. If a wrong
password is entered, the instrument returns to the previous
mode.
Note If the meter is set to measure ORP (setup item G.00), the pH
calibration, pH reading offset adjustment, and pH offset and
slope are not available. If the meter is configured for pH, no
ORP calibration can be selected.
Note Any calibration procedure can be aborted at any time by
pressing (ALT+) CAL, and the instrument returns to the previous mode.
pH CALIBRATION
To perform any pH calibration procedure, the instrument has
to be set as pH meter.
The meter can be calibrated through a one-point or twopoint calibration.
14 15
Two-point calibration
The default buffer set is the one used for last calibration,
even if the procedure was not completed.
• Once confirmed the set of buffer values, the primary LCD shows the
measured pH value, while the secondary LCD displays the first required buffer
value.
• Remove the protective cap from the pH electrode and immerse it into the buffer solution (e.g. pH 7.01) together
with the Potential Matching Pin and the temperature probe,
then stir gently.
Note The electrode should be submerged ap-
proximately 4 cm (11/2’’) in the solution. The temperature probe has to be
located as close as possible to the pH
electrode.
Note When it is not possible to immerse the Potential Matching Pin
together with the pH electrode in the solution, disable the
differential input by setting setup item I.04 to “OFF”.
• When the reading becomes stable,
the probe indicator will stop flashing (after about 30 seconds), and if
the pH value is close to the selected
buffer, the “CFM” indicator will start
blinking, otherwise the “WRONG”
indicator, the pot and the BUF tags
will start blinking.
• Press the CFM key to confirm calibration. The meter will
show the scrolling message “Press CFM again to confirm
the current buffer or right to escape” (to prevent from confirming the calibration point inadvertently).
Pressing again CFM, the secondary LCD will display the
second expected buffer value.
• In the second case (pH value not close to the buffer) the
meter will remain in the same state until the reading becomes unstable or the calibration mode is quitted.
• For the second buffer value it is possible to choose between pH 4.01 and pH 10.01 (or pH 4.01 and pH 9.18 if
the NIST set has been selected). Use the æ or key to
switch between the two possibilities.
• Once selected the buffer, the procedure is the same as for
the first calibration point.
Note A time-out of 2.5 minutes is present for the pH electrode
response time. During calibration, if the pH reading is not
stable after 2.5 minutes, the device displays twice the scroll-
ing message “time-out”, then shows “WRONG” and it is not
possible to complete calibration.
• At the end of calibration, with the meter set as pH controller, the instrument checks if the offset is between -30 and
30 mV and the slope between 53.5 and 62 mV/pH. If the
values are not within these ranges, the message “OLd
ProbE” scrolls twice across the LCD. The electrode is still
working, but it is necessary to perform a cleaning procedure (see “Electrode conditioning and maintenance” and
“In-line Cleaning” sections) or replace it.
If the offset is outside the -60 to 60 mV range, the “dEAd
ProbE” message will scroll across the LCD and the corresponding error is activated. The electrode has to be replaced
as soon as possible because there is no reliability on the
measured pH values.
One-point calibration with manual selection of the calibration value.
A one-point calibration at a value different from the standard
buffer values is possible by entering the desired calibration
value. This is the actual pH value at the current calibration
temperature.
• Enter the pH calibration mode (no matter if
the standard or NIST buffer set is selected),
then press (ALT+) SETUP while the secondary LCD is displaying the first buffer value
(pH 7.01 or pH 6.86).
• The pH calibration value will switch
to 7.00, the first digit starts blinking
and it is possible to change its value
simply using the æ or key.
• Once selected the first digit value, press the key: the first
digit will be fixed and the second one will start blinking.
Pressing of the key repeatedly will result on circularly
moving on the secondary LCD.
• When the desired calibration value is reached (must be
within 0.00 to 16.00 pH), press the CFM key to confirm
and the calibration will proceed as described above.
• If the selected value is outside boundaries, the confirmation is not accepted and the first digit keeps blinking (waiting
for confirmation of a valid value).
16 17
Note If (ALT+) SETUP are pressed instead of CFM, the calibration
Note Whenever a pH or ORP calibration is performed by means of
ORP CALIBRATION
value selection is aborted and the meter reverts back to a
two-point calibration.
HI 504920, the HI 504920 date and time are automatically set in HI 504910.
Check that the code 90 has been entered in Setup mode.
To perform ORP calibration it is necessary to connect an HI
931001 or HI 8427 simulator to the BNC socket.
The meter has to be set as ORP controller.
• A two-point calibration has to be performed: the first point
value is 0 mV and the second one can be chosen between
350 mV and 1900 mV.
• Enter the calibration mode, select the ORP calibration (use
the æ and keys to move through setup menu) and press
the CFM key.
• Set the HI 931001 or HI 8427 simulator to 0 mV.
• The primary LCD will display the current mV measure and the secondary
LCD will show the first calibration
point (0 mV).
• When the reading becomes stable,
if the ORP value is close to the calibration point, the “CFM”
indicator starts blinking; otherwise the “WRONG” indicator blinks and the “CAL” is fixed on.
• In the first case press CFM to confirm calibration. The
meter will proceed showing the scrolling message “Press
CFM again to confirm the current buffer or right to escape” (to prevent from confirming the calibration point
inadvertently). Pressing again CFM the secondary LCD will
display the second calibration point.
• In the second case (blinking “WRONG”) the meter will remain in the WRONG state until the reading becomes unstable
or the calibration mode is exited by pressing the CAL key.
• For the second calibration point it is possible to choose
between 350 mV and 1900 mV. Pressing the æ or key
the value on the secondary LCD will switch between the two
possibilities.
• Once selected the second calibration point, set the HI
931001 (350 mV) or HI 8427 (350 or 1900 mV) simulator to the same value and the calibration proceeds as for
the first point.
Note In ORP calibration there is no time-out.
Note Whenever a pH or ORP calibration is performed by means of
HI 504920, the HI 504920 date and time are automatically set in HI 504910.
TEMPERATURE CALIBRATION
Check that the code 90 has been entered in Setup mode.
• Prepare a beaker containing crushed ice and water at 0°C
(32°F) and another one with hot water at 25°C (77°F) or
50°C (122°F).
• Use a Checktemp or another calibrated
thermometer with a resolution of 0.1° as a
reference thermometer.
• Immerse the temperature probe in the beaker with ice and water as near to the
Checktemp as possible.
Note The instrument can support Pt100 or Pt1000 temperature
sensor and calibration can be performed with anyone of these
two probes.
• After entering the calibration mode, move through the menu
(using the æ or key) to choose the temperature and the
correct kind of used probe; the primary
LCD shows “°C” and the secondary LCD
gives indication about the kind of probe
(“100” indicates a Pt100 probe, while
“1000” stands for a Pt1000 probe).
Press the CFM key to confirm selection.
• The calibration has to be performed over two points: the
first point has to be 0°C and the second one can be chosen between 25°C and 50°C.
Once confirmed the type of calibration,
the primary LCD will display the current
temperature measure and the secondary LCD will show the first calibration
point (0°C).
18 19
VOLT CALIBRATION
• When the reading becomes stable, if the temperature value
is close to the calibration point the CFM tag starts blinking, otherwise the WRONG indicator will flash.
• In the first case press the CFM key to confirm calibration.
The meter will proceed showing the scrolling message “Press
CFM again to confirm the current buffer or right to escape” (to prevent from confirming the calibration point
inadvertently).
• Pressing again the CFM key, the secondary LCD will display the second
calibration point.
• In the case the measured temperature is not close to the
calibration value, the meter remains in the WRONG status
until the reading becomes unstable or the calibration mode
is exited (by pressing the CAL key).
• When performing the second calibration point, it is possible to choose between two values, 25°C and 50°C. Pressing
the æ or key the value on the secondary LCD will switch
between the two possibilities.
• Once selected the value, immerse the temperature probe
in the second beaker as near as possible to the Checktemp
and the calibration procedure will be the same as for the
first point.
Check that the code 90 has been entered in Setup mode.
The instrument is factory calibrated; however the user may
also perform the Volt calibration, which is a procedure available for the instrument configured as pH meter only.
During pH measurements the instrument reads a mV value
from the electrode and then converts it into a pH value.
• Connect a HI 931001 or HI 8427 simulator to the BNC
socket.
• Once entered the calibration mode,
move through the menu with æ or
key, select the Volt calibration (the primary LCD shows “UOLt” message) and
confirm it by pressing the CFM key.
• After confirmation the primary LCD will
show the actual mV value and the secondary LCD will display the first
calibration point.
• The calibration is performed over two points, 0 mV and
350 mV.
• Set the HI 931001 or HI 8427 simulator to 0 mV.
• When the reading becomes stable, if the measured value
is close to the calibration point the CFM tag starts blinking, otherwise the WRONG indicator will flash.
• In the first case press the CFM key to confirm calibration.
The meter will proceed showing the scrolling message “Press
CFM to confirm the current buffer or right to escape” (to
prevent from confirming the calibration point inadvertently).
• Pressing again CFM the secondary LCD will display the
second calibration point.
• Set the HI 931001 or HI 8427 simulator to 350 mV and
follow the same procedure as for the first point.
• If the measured value is not close to the calibration value,
the meter will remain in the WRONG status until the reading becomes unstable or the calibration mode is exited (by
pressing the CAL key).
20 21
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