Hanna Instruments pH 500121, pH 500122, pH 500211, pH 500212, pH 500221 Instruction Manual

pH 500 & mV 600 Series

Panel-mounted,
Microprocessor-based
pH and ORP Controllers

Instruction Manual

32

TABLE OF CONTENTS

PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . 4

GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 4

FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . 6

MECHANICAL DIMENSIONS . . . . . . . . . . . . . . . . . 7

SPECIFICATIONS pH 500 & mV 600 . . . . . . . . . . . . 8

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

CONTROL MODE . . . . . . . . . . . . . . . . . . . . . . . . 17

IDLE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

ANALOG OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . 23

RS 232 COMMUNICATION AND DATA LOGGING 25

CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

LAST CALIBRATION DATA . . . . . . . . . . . . . . . . . . . 39

STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

FAULT CONDITIONS AND SELFTEST PROCEDURES . 43

pH VALUES AT VARIOUS TEMPERATURES . . . . . . . . 47

ELECTRODE CONDITIONING AND MAINTENANCE . 48

TAKING REDOX MEASUREMENTS . . . . . . . . . . . . . 52

ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

CE DECLARATION OF CONFORMITY. . . . . . . . . . . 62

All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner.

Dear Customer,
Thank you for choosing a HANNA product.

This instruction manual refers to the following products:

pH 500111-

αα

αα

α pH controller with single setpoint, ON/OFF

control, analog output

pH 500112-

αα

αα

α pH controller with single setpoint, ON/OFF

control, RS232 output

pH 500121-

αα

αα

α pH controller with single setpoint, proportional

and ON/OFF controls, analog output

pH 500122-

αα

αα

α pH controller with single setpoint, proportional

and ON/OFF controls, RS232 output

pH 500211-

αα

αα

α pH controller with dual setpoint, ON/OFF

control, analog output

pH 500212-

αα

αα

α pH controller with dual setpoint, ON/OFF

control, RS232 output

pH 500221-

αα

αα

α pH controller with dual setpoint, proportional

and ON/OFF controls, analog output

pH 500222-

αα

αα

α pH controller with dual setpoint, proportional

and ON/OFF controls, RS232 output

mV 600111-

αα

αα

α ORP controller with single setpoint, ON/OFF

control, analog output

mV 600112-

αα

αα

α ORP controller with single setpoint, ON/OFF

control, RS232 output

mV 600121-

αα

αα

α ORP controller with single setpoint, propor-

tional and ON/OFF controls, analog output

mV 600122-

αα

αα

α ORP controller with single setpoint, propor-

tional and ON/OFF controls, RS232 output

α α

α α

α = 1 means 115 Vac, 50/60 Hz power supply
α α

α α

α = 2 means 230 Vac, 50/60 Hz power supply

Please read this instruction manual carefully before using the
instrument. It will provide you with all necessary information
for a correct use of the controller.

If you need additional technical information, do not hesitate
to e-mail us at [e-mail]

These instruments are in compliance with

directives.

54

• Temperature compensation of the pH reading (for pH 500
Series only).

• Manual temperature setting when the temperature probe is
not inserted or temperature exceeds the upper range.

• Last calibration data internally recorded (non-volatile EE­PROM memory): calibration date and time, pH offset, pH
slopes, number of calibration points and correspondent
pH values (for pH 500 Series only) or calibration date and
time and the mV calibration points used (for mV 600 Series
only).

• Input:pH electrode with BNC connector.

• Output:

- isolated 0-1 mA, 10 K maximum load (optional);

- isolated 0-20 mA, 750  maximum load (optional);

- isolated 4-20 mA, 750  maximum load (optional);

- isolated 0-5 Vdc, 1 K minimum load (optional);

- isolated 1-5 Vdc, 1 K minimum load (optional);

- isolated 0-10 Vdc, 1 K minimum load (optional).

• Real time clock.

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.

GENERAL DESCRIPTION

The product is a real time microprocessor-based pH/ORP
controller. It provides accurate measurements, flexible
ON/OFF or proportional control capabilities and dual
alarm signals.

The system is composed of a case inside which the signal
conversion circuitry, the microprocessor circuitry and the
output power drivers are contained.

MAIN FEATURES OF DIFFERENT MODELS

• Display: large LCD with 4½ 17 mm digits and 3 ½ 10 mm
digits.

• LEDs: three (mV 600) or four (pH 500) LEDs are provided
for signaling the energizing of relay 1 (a yellow led), relay
2 (a yellow led in pH 500 Series only) and alarm relays (a
green and a red LED).

• Relays: 1 or 2 output relays for acid or base dosage (COM,
NO and NC contacts) and 1 output relay for alarm condi­tion (COM, NO and NC contacts).

• RS232 isolated communication link (optional).

• Calibration and Setup procedures allowed only through
an unlock password.

• Calibration: for pH 500 Series in 1, 2 or 3 points with
buffers 4.01, 7.01 and 10.01 pH (25 °C); for mV 600
Series in 1 or 2 points at 0, 350 and 1900 mV.

• Temperature compensation of the HANNA standard buff­ers (for pH 500 Series only).

76

REAR PANEL

1. RS232 Connection Port (pH500XY2 and mV600XY2 models only)

2. Analog Output (pH500XY1 and mV600XY1 models only)

3. Power Supply Input

4. Alarm Terminal

5. Relay 2 - Second Dosing Terminal (pH5002XY models only)

6. Relay 1 - First Dosing Terminal

7. Connections for Pt 100 Temperature Sensor

8. Connection for Electrode Reference

9. Connection for Potential Matching Pin

10. BNC Socket for pH or ORP Electrode

11. ±5V Power Supply Output

Unplug the meter before starting any electrical connections.

MECHANICAL DIMENSIONS

FRONT VIEW SIDE VIEW

FUNCTIONAL DESCRIPTION

FRONT PANEL

1. Liquid Crystal Display

2. LCD key exits from setup and calibration modes and reverts back to
normal mode (in idle or control phases with the measure­ment on the display). In pH 500 series, during pH
calibration, alternately displays pH buffer value or current
temperature

3. SETUP key enters setup mode

4. CAL DATA key last calibration data viewing (enters and exits)

5. CAL key initiates and exits calibration mode

6.  key increases the blinking digit/letter by one when selecting a
parameter. Advances forward while in last calibration data
viewing mode. Increases the temperature setting when
temperature probe is not inserted

7.  key decreases the blinking digit/letter by one when selecting a
parameter. Reverts backward while in last calibration data
viewing mode. Decreases the temperature setting when
temperature probe is not inserted

8.  key moves to the next digit/letter (circular buffer) when select­ing a parameter. Same as  key during last calibration
data viewing mode

9. CFM key confirms current choice (and skips to the next item)

10. LEDs

98

INSTALLATION

pH 500 and mV 600
offer a multitude of
possibilities, from
single and dual set­points to ON/OFF or
proportional dosage,
isolated outputs with
user-selectable zoom,
bi-directional RS232,
recorder outputs in
mAmps and volts.

In addition, pH 500
and mV 600 are both
equipped with the ex­clusive differential
input.

In a system with poor
grounding, it is
possible to have a
ground current flow­ing through the
reference junction.
This can cause a rapid
degradation of the
electrode. The Hanna
differential input
reduces the likelihood
of ground loops.

See the diagram for a
recommended instal­lation.

SPECIFICATIONS pH 500 & mV 600

Range 0.00 to 14.00 pH (pH 500 series only)

±2000 mV (mV 600 series only)

-9.9 to 120.0 °C

Resolution 0.01 pH (pH 500 series only)

1 mV (mV 600 series only)

0.1 °C

Accuracy ±0.02 pH (pH 500 series only)

(@20°C/68°F) ±2 mV (mV 600 series only)

±0.5 °C

Typical EMC Deviation ±0.2 pH (pH 500 series only)

±10 mV (mV 600 series only)
±0.5 °C

Calibration pH: automatic, 1, 2 or 3 point, at pH 4.01, 7.01, 10.01

ORP: automatic, 2 point, at 0 and 350 or 1900 mV

Temperature Compensation (pH 500 series only)

automatic (with Pt100 probe) or manual, -9.9 to 120°C

Outputs digital: RS232 bi-directional, optoisolated; or

analog, galvanically isolated: 0-1 mA, 0-20 mA and
4-20 mA, 0-5 Vdc, 1-5 Vdc and 0-10 Vdc

Setpoint Relay 1 or 2 contact outputs SPDT, 5A-250 Vac, 5A-30 Vdc

(resistive load). Fuse protected: 5A, 250V FUSE

Alarm Relay 1 contact output SPDT, 5A-250 Vac, 5A-30 Vdc

(resistive load). Fuse protected: 5A, 250V FUSE

Installation Category II

Power Supply 230 ±10% VAC or 115 ±10% VAC, 50/60 Hz

Power Consumption 15 VA

Over Current Protection 400 mA 250V FAST FUSE

Max.Oscillation Frequency 4 MHz

Environment 0 to 50°C (32 to 122°F); RH max 95%

Enclosure single case ½ DIN

Dimensions panel cutout: 140 x 140 mm

instrument: 144 x 144 x 170 mm

Weight approximately 1.6 kg. (3.5 lb.)

1110

SETUP MODE

pH 500 and mV 600 offer a multitude of possibilities from
ON/OFF or proportional dosage to analog recorder output
and from alarm to selftest features.

The Setup Mode allows the user to set all needed character­istics of the meter.

The setup mode is entered by pressing SETUP
and entering the password when the device
is in idle or control mode.

Generally speaking, if the password is not inserted the user
can only view the setup parameters (except for password)
without modifying them (and the device remains in control
mode). An exception is certain setup items, or flags, which
can activate special tasks when set and confirmed.

Each setup parameter (or setup item) is assigned a two­digit setup code which is entered and displayed on the
secondary LCD.

The setup codes can be selected after password and CFM
are pressed. When CFM is pressed, the current setup item
is saved on EEPROM and the following item is displayed.
Whenever LCD is pressed, the
device reverts back to control
mode. The same is true when
CFM is pressed on the last setup
item.

The possible transitions in setup mode are the following:

ENTERING THE PASSWORD

• Press SETUP to enter the setup mode. The LCD will display
“0000” on the upper part and “PAS” on the lower. The first
digit of the upper part of the LCD will blink.

• Enter the first value of the pass­word by the  or  keys.

• Power Supply: Connect a 3-wire power cable
to the terminal strip, while paying attention
to the correct line (L), earth (PE) and neu­tral (N) terminal connections.

Power: 115VAC - 100 mA / 230VAC - 50 mA

Line Contact: fused inside 400 mA.

PE must be connected to ground; leakage current 1mA.

• Electrode: Connect the pH or ORP electrode to the BNC
socket (#10 at page 7).
To benefit from the differential input, connect the proper
electrode wire (if available) or a cable with a potential
matching pin (grounding
bar) to the relevant termi­nal (#9 at page 7).

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 connecting the Connection for Potential
Matching Pin (#9 at page 7) with the Connection for Elec­trode Reference (#8 at
page 7) with a jumper wire.

• Pt 100 Terminals: these contacts (#7 at page 7) connect
the Pt 100 temperature sensor for automatic temperature
compensation of pH measurement. In the case of shielded
wire, connect the shield to pin 4.

In the case of a 2-wire sensor con­nect the Pt 100 to pins 1 and 3,
and short pins 2 and 3 with a
jumper wire.

If the Pt 100 has more than 2
wires, connect the two wires of one
end to pins 2 and 3 (pin 2 is an
auxiliary input to compensate for
the cable resistance) and one wire
from the other end to pin 1. Leave
the fourth wire unconnected, if present.

• Power Supply Output: these terminals
provide +5 Vdc and -5 Vdc signals to
supply power to amplified electrodes.

Note All cables connected to rear panel should end with cable lugs.

1312

• After confirmation, the selected param­eter is displayed. The user can scroll
through the parameters by pressing CFM.

In order to directly set another param­eter, press SETUP again and enter the
code or scroll to it by pressing CFM.

The following table lists the setup codes along with the descrip­tion of the specific setup items, their valid values and whether
password is required to view that item (“PW” column):

Code Valid Values Default PW

00 Factory ID 0 to 9999 0000 no

01 Process ID 0 to 999 9 0000 no

02 Control enable/disable 0: C.M. disabled 0 no

1: C.M. enabled

11 Relay 1 mode 0: disabled 0 no

(M1) 1: ON-OFF high setpoint

2: ON-OFF low setpoint
3: Proportional, high setpoint
4: Proportional, low setpoint

12 Relay 1 setpoint 0.00 to 14.00 pH 8.00 pH no

(S1) -2000 to 2000 mV 500 mV

13 Relay 1 hysteresis 0.00 to 14.00 pH 1 pH no

(H1) 0 to 4000 mV 50 mV

14 Relay 1 deviation 0.50 to 14.00 pH 1 pH no

(D1) 25 to 4000 mV 50 mV

21* Relay 2 mode (M2) same as relay 1 0 no

22* Relay 2 setpoint (S2) 0.00 to 14.00 pH 6.00 pH no

-2000 to 2000 mV -500 mV

23* Relay 2 hysteresis (H2) 0.00 to 14.00 pH 1 pH no

0 to 4000 mV 50 mV

24* Relay 2 deviation (D2) 0.50 to 14.00 pH 1 pH no

25 to 4000 mV 50 mV

* Available only in models with two relays

• Then confirm the displayed digit with
 and move to the next one.

• When the whole password has been
inserted, press CFM to confirm it.

Note The default password is set at “0000”.

• The LCD will display “SET” on the
upper part and “c.00” on the lower,
allowing the user to edit setup pa­rameters (see table below).

• Enter the code of the parameter you want to set, using the
arrow keys as per the password procedure above (e.g.41).

• Confirm the code by pressing CFM and the default or the
previously memorized value will be displayed with the first
digit blinking.

Note When the password is not inserted or a wrong password is

confirmed, the display will only show the previously memo­rized value, without blinking (read only mode). In this case,
the value cannot be set. Press LCD and start again.

• Enter the desired value using the arrow keys and then press
CFM.

1514

Code Valid Values Default PW

92 EEPROM selftest 0: off 0 yes

1: on

93 Relays and LEDs selftest 0: off 0 yes

1: on

94 Watchdog selftest 0: off 0 yes

1: on

99 Unlock password 0000 to 9999 0000 yes

Note The process controller automatically checks to ensure that

the entered data matches other related variables. If a wrong
configuration is entered, “WRONG” blinks on the LCD to
prompt the user. The correct configurations are the following:

If M1=/ 0 then S1

<HA, S1>LA;

If M2=/ 0 then S2

<HA, S2>LA;

If M1= 1 then S1-H1

>LA;

If M1= 2 then S1+H1

<HA;

If M1= 3 then S1+D1

<HA;

If M1= 4 then S1-D1

>LA;

If M2= 1 then S2-H2

>LA;

If M2= 2 then S2+H2

<HA;

If M2= 3 then S2+D2

<HA;

If M2= 4 then S2-D2

>LA;

If M1= 1 and M2 = 2
then S1-H1

>S2+H2, S2>LA, HA>S1;

If M1 = 2 and M2 = 1
then S2-H2

>S1+H1, S1>LA, HA>S2;

If M1 = 3 and M2 = 2
then S1

>S2+H2, S2>LA, HA>S1+D1;

If M1 = 2 and M2 = 3
then S1+H1

<S2, S1>LA, HA>S2+D2;

If M1 = 4 and M2 = 1
then S1

<S2–H2, S1–D1>LA, HA>S2;

If M1 = 1 and M2 = 4
then S1–H1

>S2, S2–D2>LA, HA>S1;

If M1 = 3 and M2 = 4

Code Valid Values Default PW

30 Relay 3 high alarm (HA) 0.00 to 14.00 pH 9.00 pH no

-2000 to 2000 mV 600 mV
HA>LA, HA>S1 or HA>S2

31 Relay 3 low alarm (LA) 0.00 to 14.00 pH 5.00 pH no

-2000 to 2000 mV -600 mV
LA<HA, LA<S1 or L A<S2

32 Proportional control 1 to 30 min 5 no

mode period

33 Maximum relay ON time 10 to 9999 min 60 no

(after which an alarm mode is entered)

40 Analog output selection 0: 0-1mA 2 no

1: 0-20 mA
2: 4-20 mA
3: 0-5 VDC
4: 1-5 VDC
5: 0-10 VDC

41 Analog output 0.00 to 13.00 pH 0.00 pH no

lower limit -2000 to 2000 mV -2000 mV
(O_VARMIN) (O_VARMIN< O_VARMAX - (1.00pH or 50mV))

42 Analog output 1.00 to 14.00 pH 14.00 pH no

upper limit -2000 to 2000 mV 2000 mV
(O_VARMAX) (O_VARMIN< O_VARMAX - (1.00pH or 50mV))

60 Current day 01 to 31 from RTC no

61 Current month 01 to 12 from RTC no

62 Current year 1997 to 9999 from RTC no

63 Current time 00:00 to 23:59 from RTC no

71 Baud rate 1200, 2400, 4800, 9600 4800 no

90 Display selftest 0: off 0 yes

1: on

91 Keyboard selftest 0: off 0 yes

1: on

1716

CONTROL MODE

The control mode is the normal operational mode for these
meters. During control mode pH 500 and mV 600 fulfill the
following main tasks:

• convert information from pH/ORP and temperature inputs
to digital values;

• control relays and generate the analog outputs as deter­mined by the setup configuration, display alarm condition;

• RS232 management.

In addition, pH 500 and mV 600 can log working data
through RS232 connection. This data includes:

• pH, mV and

o

C measured values;

• last calibration data;

• setup configuration (also from PC).

The status of the meter is shown by the LED’s on the right

STATUS LEDs

Control Alarm Alarm LED (green) Relay LED (yellow) Red LED

OFF ---- ON O FF ON

ON OFF ON ON or OFF OFF

ON ON OFF ON or OFF Blinking

Meter exits control mode by pressing SETUP or CAL and con­firming the password. Note that
this command generates a tem­porary exit. To deactivate the
control mode definitively, set
CONTROL ENABLE to “0” (item # 02).

RELAY MODES

Once enabled, the relays 1 and 2 can be used in four differ­ent modes:

1) ON/OFF, high setpoint (acid dosage);

2) ON/OFF, low setpoint (base dosage);

3) proportional, low setpoint (base dosage, if available);

4) proportional, high setpoint (acid dosage, if available).

then S1>S2, S2–D2>LA, HA>S1+D1;
If M1 = 4 and M2 = 3

then S2

>S1, S1–D1>LA, HA>S2+D2;

where the minimum deviation (D1 or D2) is 0.5 pH (for
pH 500) or 25 mV (for mV 600).

Note The password cannot be viewed when SETUP is pressed

without entering the original password first. The default
password is set at “0000”. In the event that the user forgets
the password, this can be reset to “0000” by pressing and
holding CFM and then pressing LCD and CAL DATA at the
same time when the pH controller is in normal operating
mode (idle or control with measurement displaying).

Note When a wrong setup value is con-

firmed, the pH controller does not
skip to the next setup item but remains
in the current item displaying a flash­ing “WRONG” indicator until the pa­rameter value is changed by the user (the same is also true
for the setup code selection). In some circumstances, user
cannot succeed in setting a parameter to a desired value if
the related parameters are not changed beforehand; e.g. to
set a pH high setpoint to 10.00 the high alarm must be set to
a value greater than pH 10.00 first.

Note For code numbers 40, 41, 42, the output is related to pH or

mV units depending on the model (pH process meters or mV
process meters).

1918

PROPORTIONAL CONTROL MODE

The user can vary three different parameters, i.e. the setpoint
(S1 or S2), the deviation (D1 or D2) and the proportional
control mode period T

c

from 1 to 30 minutes. Duration of the
activated control is directly proportional to the error value
(Duty Cycle Control Mode): as the measurement approaches
setpoint, the ON period diminishes.

The following graph describes the pH process controller be­havior. Similar graph may apply to the mV controller.

During proportional control the process controller calculates
the relay activation time at certain moments t

0

, t0+Tc, t0+2T

c

etc. The ON interval (the shaded areas) is then proportional
to the error amplitude.

For example with S1 representing High Setpoint

Setpoint (S1) = 7.00 pH
Deviation (D1) = 1.00 pH
T

c

= 1 minute

If measurement

> 8.00 pH, then ON all the time.

If measurement = 7.60 pH, then ON for 36 seconds

OFF for 24 seconds.

If measurement = 7.10 pH, then ON for 6 seconds

OFF for 54 seconds.

The number of strokes per minute of the pump can be
changed only by means of the pump’s command.

Referring to the following diagram (low setpoint) the relay is:

• ALWAYS ON if pH < setpoint-deviation;

• ON proportionally to the error
if setpoint - deviation < pH < setpoint

ON

OFF

14

Setpoint +
Hysteresis

Setpoint

t

0

t0+Tct0+2T

c

t0+3T

c

An upper boundary is imposed for acid/base dosage time
when relays are energized continuously, i.e. when relay works
in ON/OFF mode or in proportional mode but in the latter
case only if the relay is always ON. This parameter can be set
through setup procedure. When the maximum boundary is
reached, an alarm is generated; device stays in alarm condi­tion until relay is de-energized.

ON/OFF CONTROL MODE

Either for mode 1 or 2 (base or acid dosage) the user has to
define the following values through setup:

• relay setpoint (pH/mV value);

• relay hysteresis (pH/mV value).
Connect your device to the COM

and NO (Normally Open) or NC
(Normally Closed) terminals.

The ON relay state occurs when relay is energized (NO and
COM connected, NC and COM disconnected).

The OFF relay state occurs when relay is de-energized (NO
and COM disconnected, NC and COM connected).

The following graphs show relay states along with pH mea­sured value (similar graph can be derived for mV control).

As shown below, a high setpoint relay is activated when the
measured pH exceeds the setpoint and is deactivated when it
is below the setpoint value minus hysteresis.

Such a behavior is suitable to control an acid dosing pump.
A low setpoint relay as can be seen from the following graphs
is energized when the pH value is below the setpoint and is
de-energized when the pH value is above the sum of setpoint
and the hysteresis. The low setpoint relay may be used to
control an alkaline dosing pump.

ON

OFF

Setpoint

14

Setpoint –
Hysteresis

2120

In addition to the user-selectable alarm relays, all pH 500
and mV 600 models are equipped with the Fail Safe alarm
feature.

The Fail Safe feature protects the process against critical
errors arising from power interruptions, surges and human
errors. This sophisticated yet easy-to-use system resolves
these predicaments on two fronts: hardware and software. To
eliminate problems of blackout and line failure, the alarm
function operates in a “Normally Closed” state and hence
alarm is triggered if the wires are tripped, or when the power
is down. This is an important feature since with most meters
the alarm terminals close only when an abnormal situation
arises, however, due to line interruption, no alarm is sounded,
causing extensive damage. On the
other hand, software is employed to set
off the alarm in abnormal circum­stances, for example, if the dosing
terminals are closed for too long a
period. In both cases, the red LED’s
will also provide a visual warning sig­nal.

The Fail Safe mode is accomplished by connecting the exter­nal alarm circuit between the FS•C (Normally Open) and
the COM terminals. This way, an alarm will warn the user
when pH goes over the alarm thresholds, the power breaks
down and in case of a broken wire between the process meter
and the external alarm circuit.

Note In order to have the Fail Safe feature activated, an external

power supply has to be connected to the alarm device.

• ALWAYS OFF if pH > setpoint;

Using a similar format, the second relay may be set up ac­cording to the diagram below.

ALARM RELAY

The alarm relay functions in the following manner:

During alarm condition, the relay is de-energized. When not
in alarm condition, the relay is energized.

Example: High alarm set at 10 pH

Low alarm set at 4 pH

Note If the power supply is interrupted, the relay is de-energized as

if in alarm condition to alert the operator.

High setpoint mode

alarm

ON

OFF

0

Setpoint +
Deviation

Setpoint

14

ON

OFF

Low setpoint mode

0 alarm Setpoint

14

Setpoint–

Deviation

FS•O = NC (Normally Closed)

De-energized Relay

COM

FS•C = NO (Normally Open)

Energized Relay

2322

ANALOG OUTPUT

All models pH 500XY1 and mV 600XY1 are provided with the
analog output feature.

The output is isolated and can be a voltage or a current.
With the recorder, simply connect the

common port to the ground output and
the second port to the current output
or voltage output (depending on which
parameter is being used) as depicted
aside.

The type (voltage or current) and the range of the output
analog signal is selectable through the jumpers on the power
board.

Configurations of the switch are as follows:

Output Switch 1 Switch 2 Switch 3 Switch 4

0-5 Vdc, 1-5 Vdc OFF ON – – – –

0-10 Vdc ON OFF – – – –

0-20 mA, 4-20 mA – – – – ON – –

0-1 mA – – – – OFF – –

Choice between different ranges with the same configuration
(for example 0-20 mA and 4-20 mA) is achieved via soft­ware by entering the setup mode and selecting code 40 (see
Setup Mode section for exact procedure).

Factory default is switches 1 and 3 closed (ON) and switches
2 and 4 open (OFF), i.e. 0-20 mA, 4-20 mA, and 0-10 Vdc.

In any case, contact the nearest Hanna Customer Service
Center for changing of the default configuration.

By default the minimum and maximum values of analog out­put correspond to the minimum and maximum of the range
of the meter. For example, for the pH 500 series with a se­lected analog output of 4-20 mA, the default values are 0.00
and 14.00 pH corresponding to 4 and 20 mA, respectively.

IDLE MODE

During idle mode the device performs the same tasks as when
it is in control mode except for the relays. The alarm relay is
activated (no alarm condition), the acid and base relays are
not activated while the analog output remains activated.

When the instrument is in idle mode the red and green status
LEDs are on.

Idle mode is useful to disable control actions when the exter-

nal devices are not installed or when the user detects un­usual circumstances.

Control actions are stopped as soon as
the user presses SETUP and enters the
password.

In order to reactivate the control mode, use code 02 of setup
(see “Setup” section). Otherwise, the meter remains in idle
mode.

2524

RS232 COMMUNICATION AND DATA LOGGING

All models pH 500XY2 and mV 600XY2 are provided with an
RS232 port.

Data transmission from the instrument to the PC is possible
with the HI 92500 Windows

®

compatible software by Hanna

Instruments.
The user-friendly HI 92500 offers a variety of features such

as logging selected variables or plotting the recorded data.
It also has an on-line help feature to support you through­out the operation.

HI 92500 makes it possible for you to use the powerful
means of the most diffused spreadsheet programs (Excel

©

,
Lotus 1-2-3© etc.). Simply run your favorite spread sheet
and open the file downloaded by HI 92500. It is then
possible to elaborate the data with your software (e.g.
graphics, statistical analysis).

To install HI 92500 you need a 3.5" drive and few minutes
to follow the instructions conveniently printed on the disk’s
label.

Contact your Hanna Dealer to request a copy.

ELECTRICAL CONNECTIONS

To connect your Hanna meter to a PC use an HI 920010
cable.

Make sure that your meter is switched off and plug the
connectors, one to the meter RS232 connector and the other
to the serial port of your PC.

If your interface does not fully comply with the RS232 stan­dard, wiring could be different.

The GND pin of the interface connector and all the inter­face signals are optoisolated from the ground of the
instrument, the pH electrode and the temperature sensor.

Before connecting the meter to the computer, consult the
computer manual.

These values can be changed by the user to have the analog
output matches a different pH range, for example, 4 mA =

3.00 pH and 20 mA = 5.00 pH.
To change the default values, the setup mode must be en-

tered. Setup codes for changing the analog output minimum
and maximum are 41 or 42, respectively. For the exact
procedure, refer to the setup mode section in the manual.

Note The difference between maximum and minimum values for

the analog output must be at least 1.00 pH or 50 mV.

Note The analog output is factory calibrated through software. The

user may also perform these calibration procedures following
the procedure at page 36. It is recommended to perform the
output calibration at least once a year.

2726

CALIBRATION

The controller is factory calibrated for mV and temperature
inputs as well as for the analog outputs.

The user should periodically calibrate the instrument. For great­est accuracy, it is recommended that the instrument is calibrated
frequently.

It is possible to standardize the electrode with only one buffer,
preferably close to the expected sample value (one-point cali­bration), but it is always good practice to calibrate in at least
2 points.

pH CALIBRATION (for pH 500 Series only)

The pH controller can be calibrated through a one-point,
two-point or three-point calibration. You do not need to en­ter the method chosen, simply exit the
calibration mode, by pressing CAL,
when the desired number of points has
been calibrated.

The calibration points for pH 500 are pH 4.01, pH 7.01 and
pH 10.01 (at 25°C). The sequence proposed by the control­ler is pH 7.01, pH 4.01, pH 10.01. However, the user can
change this sequence by means of the  and  keys.

The electrode must be kept hydrated at all times and defi­nitely prior to calibration. The temperature probe should also
be connected to the process meter. The meters are equipped
with a stability indicator. The user is also guided with indica­tions on the display during the calibration procedure.

Initial Preparation

Pour small quantities of pH 7.01
(HI 7007) and pH 4.01 (HI 7004)
and/or pH 10.01 ( HI 7010) solutions
into individual beakers. If possible, use
plastic beakers to minimize any EMC
interference.

HI 7007

HI 7004

HI 7004

Excel© Copyright of “Microsoft Co.”
Lotus 1-2-3

©

Copyright of “Lotus Co.”

Windows

®

and Windows Terminal® are registered Trademark of “Microsoft Co.”

Note Cables other than HI 920010 may use a different configu-

ration. In these cases, no communication between the meter
and the PC is possible. If you are not using the HI 920010
cable, contact the nearest Hanna Customer Service Center
or proceed as follows for a proper electrical connection:

pH 500/mV 600 PC

9-pin DSUB male connector 9-pin DSUB female connector

Pin 2 Pin 3 (Txd)
Pin 3 Pin 2 (Rxd)
Pin 4 Pin 6 (Txd)
Pin 5 Pin 5 (Gnd)
Pin 6 Pin 4 (DTR)

Pin 7 short circuit with 8

(RTS+CTS)

pH 500/mV 600 PC

9-pin DSUB male connector 25-pin DSUB female connector

Pin 2 Pin 2 (Txd)
Pin 3 Pin 3 (Rxd)
Pin 4 Pin 6 (Txd)
Pin 5 Pin 7 (Gnd)
Pin 6 Pin 20 (DTR)

Pin 4 short circuit with 5

(RTS+CTS)

SETTING THE BAUD RATE

The transmission speed (baud rate) of the meter and the
external device must be identical.

The meter is factory set to 4800. If you wish to change this
value, use item 71 in the setup mode (see page 14).

2928

• Remove the protective cap from the
pH electrode and immerse it into the
selected buffer solution (e.g. pH 7.01)
with the Potential Matching Pin and
temperature probe, then stir gently.

Note The electrode should be submerged ap-

proximately 4 cm (1½") in the solution.
The temperature probe should 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 connecting the Connection for Potential
Matching Pin (#9 at page 7) with the Connection for Elec­trode Reference (#8 at page 7) with a jumper wire.

• Only when the reading is stable the
probe indicator "

" will stop flashing
(after about 30 seconds) and the
"CFM" indicator will start blinking.

• Press CFM to confirm the calibration; if the reading is close to
the selected buffer (±1.5 pH), the meter stores the reading
and the secondary LCD will display the expected second buffer
value. Offset and slope calculation is made at the end by
pressing CAL to exit.

If the reading is not close to the selected
buffer, "WRONG

BUF

" will blink.

• If CAL is pressed, the calibration pro­cess ends by memorizing a new offset
value. The new offset value is stored
and a default value of 57.5 mV per
pH unit at 25°C is assigned as the
new slope value.

For best accuracy however, it is recommended that a two­point calibration is performed.

HI 7007

CALIBRATION

HI 7007

RINSE

For accurate calibration, use two beakers for each buffer
solution, the first one for rinsing the electrode, the second
one for calibration. By doing this, contamination between
the buffers is minimized.

To obtain accurate readings, use pH 7.01 and pH 4.01 if
you measure acidic samples, or pH 7.01 and pH 10.01 for
alkaline measurements or perform a 3-point calibration for
the entire range.

One Point Calibration (Offset)

• To perform the pH calibration enter
the calibration mode, by pressing
CAL and entering the password.

• After the correct password is entered,
the control actions stop and the pri­mary LCD will display the pH value
using the current offset and slope,

with the "CAL" and "

BUF

1

" indicators lit

and the probe indicator "

" blink­ing. The value displayed on the
secondary LCD is the buffer value
at the actual temperature.

Note The actual pH value varies with temperature, thus the cali-

bration value displayed on the secondary LCD will vary around
pH 4.01, 7.01 and 10.01 with temperature changes: for ex­ample at 25 oC the display shows 4.01 - 7.01 - 10.01, at 20

o

C it shows 4.00 - 7.03 - 10.06 (see page 47 for other val-

ues).

• pH 7.01 is the default value for
the 1

st

calibration buffer. If a dif­ferent value is needed, select it
on the secondary display by
pressing  or  .

Note If the wrong password is entered the system reverts back and

restarts displaying the pH value.

3130

Three-point Calibration

• Proceed as described above but do
not quit calibration by pressing CAL.

Note The meter will automatically skip the two buffers that were

used to prevent errors.

• After the second calibration point
is confirmed, immerse the pH elec­trode and the Potential Matching Pin
into the third buffer solution (e.g.
pH 10.01) and stir gently.

Note The electrode should be submerged

approximately 4 cm (1½") in the so­lution. The temperature probe should
be located as close as possible to the
pH electrode.

• Only when the reading is stable the
probe indicator "

" will stop flash­ing (after about 30 seconds) and the
"CFM" indicator will start blinking.

• Press CFM to confirm the calibration; if the reading is close
to the selected buffer, the meter stores the reading, adjust­ing the 2

nd

slope point and the calibration process is ended
with the offset and the 1st and 2nd slope of the meter cali­brated.

If the reading is not close to the se­lected buffer, "WRONG

BUF

" will

blink.

Note During calibration, the secondary LCD displays the selected

buffer value. By pressing LCD the temperature can be dis­played. This will allow you to check the buffer temperature
during calibration.

Two-point Calibration

• Proceed as described above for one-point cali­bration, using pH 7.01 as the first point, but do

not quit calibration by pressing CAL at the end.

Note The meter will automatically skip the buffer that was used for

the first calibration to prevent errors.

• After the first calibration point is con­firmed, immerse the pH electrode with
the Potential Matching Pin into the sec­ond buffer (e.g. pH 4.01) and stir gently

Note If you are not going to perform a three-point calibration, it is

recommendable to use pH 4.01 buffer if you are going to mea­sure acid samples, or use pH 10.01 buffer for alkaline samples.

Note The electrode should be submerged ap-

proximately 4 cm (1½") in the solution.
The temperature probe should be located
as close as possible to the pH electrode.

• Select the 2

nd

buffer value on
the secondary display by press­ing  or  (e.g.pH 4.01).

• Only when the reading is stable
the probe indicator "

" will stop
flashing (after about 30 seconds) and
the "CFM" indicator will blink.

• Press CFM to confirm the calibration; if the reading is close
to the selected buffer, the meter stores the reading, adjust­ing the slope point and the secondary LCD will display
the expected third buffer value.

If the reading is not close to the se­lected buffer, "WRONG

BUF

" will

blink.

• Press CAL and the calibration pro­cess is ended with the offset and the
1

st

slope of the meter calibrated.

3332

mV INPUT CALIBRATION

The pH/mV controller is factory calibrated for the mV and
temperature inputs. However, the user may also perform a
mV calibration.

• Short the Connection for Potential Matching Pin (#9 at
page7) and the Connection for the Electrode Reference
(#8 at page 7) with a jumper wire.

• Attach a HI 931001 (pH 500) or HI 8427 (mV 600) simu­lator to the BNC socket.

• Press and hold first CFM and then
CAL to enter the mV Input Cali­bration mode.

• Execute the password procedure.

• With pH 500, the meter will ask for the calibration proce­dure code number. The following table lists the possible
values of the input code and calibration points:

INPUT CODE POINTS CAL.VALUES INPUT RANGE

mV 0 2 0 & 350 or 0 & 1900* ±2000,

Temp. 1 2 0 & 25 or 0 & 50 -9.9 to 120.0 °C

* One of the points must be 0. 1900 mV calibration point is available

on mV 600 models only.

When calibrating the mV of mV 600 models, enter the

calibration mode by pressing CAL and confirming the pass­word (as for pH calibration of pH 500). No code selection
is required.

• Use  or  to select code 0 for mV calibration and press
CFM to enter.

• CAL will blink on the LCD until the
meter confirms a steady reading.

CALIBRATION WITH MANUAL TEMPERATURE COMPENSATION

• Enter the calibration procedure and press LCD to display
the temperature on the secondary LCD.

• Unplug any temperature probe that may
be attached to the meter. The "°C" sym­bol will flash.

• Note the temperature of the buffer solutions with a
ChecktempC or an accurate thermometer with a resolution
of 0.1°C.

• Use  or  to manually adjust the display reading to the
value of the reference thermometer (e.g. 20°C).

• Follow the calibration procedure above (see page 27).

Note To toggle between the pH buffer and the

temperature press LCD.

When a one-point calibration is carried out only the pH off­set is computed and stored, while the pH slope is fixed
according to the theoretical values.

With a two-point calibration, offset and slope are computed
to fit the two calibration points. With a three-point calibra­tion the offset and first slope values refers to pH 4.01 and

7.01 buffers, while the second slope refers to pH 7.01 and

10.01 buffers.

Note If the process meter has never been cali-

brated or an EEPROM reset has occurred,
the meter continues to perform measure­ment. However, user is informed of a pH calibration
requirement by a blinking “CAL” (see “Startup” section).

The device must be calibrated within the temperature range
of 0-95°C. Outside this range, the buffer pH values are not
reliable.

3534

• Use a Checktemp or a 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.

• Press and hold first CFM and then
CAL to enter the temperature cali­bration mode.

• Execute the password procedure.

• With pH 500, the meter will ask for the calibration proce­dure code number. Use  or  to select code 1 for the
temperature calibration and press CFM to enter.

• CAL will blink on the LCD until the
meter confirms a steady reading.

• When the reading has stabilized at
a point near the first calibration
point, CAL will stop blinking and an
intermittent CFM will prompt the user
to confirm the first calibration.

• If the reading stabilizes at a reading
significantly variant from the first
setpoint, an intermittent WRONG
will prompt the user to check the
beaker or baths.

• After pressing CFM the unit will switch to the second cali­bration point.

• Select 25 or 50°C by pressing  or  .

0 °C

(32 °F)

°C

• When the reading has stabilized at
a point near the first calibration
point, CAL will stop blinking and an
intermittent CFM icon will prompt the
user to confirm the first calibration.

• If the display stabilizes at a value
significantly different from the first
setpoint, an intermittent WRONG
icon will prompt the user to check
and adjust the simulator and start
again.

• After pressing CFM the unit will switch to the second cali­bration point at 350 mV.

• With mV 600 it is possible to select 1900 mV by pressing
 or  . After that, proceed as described above.

Note A measure is considered stable when it varies little within a

sequence of acquisitions. The number of acquisitions is fixed
so that the waiting time for blinking “CFM” is about 20 sec­onds.

Calibration procedure may be interrupted by
pressing CAL. If the calibration procedure is in­terrupted this way, or if the controller is switched
off before the last step, no calibration data is
stored to EEPROM.

TEMPERATURE CALIBRATION

The pH/mV controller is factory calibrated for the mV and
temperature inputs. However, the user may also perform a
temperature calibration.

• Prepare a beaker containing ice
and water at 0°C/32°F and an­other one with hot water at
25°C/77°F or 50°C/122°F.

0 °C

(32 °F)

°C

50 ºC

(122 ºF)

°C

3736

• Press CFM to confirm the selected parameter that will stop
blinking on the primary display. The secondary display shows
the HI 931002 or multimeter input value as lower limit of
the interval.

• Use the  or  to make the
HI 931002 or multimeter out­put correspond with the
meter’s value shown on the
secondary display (e.g. 4).

• Wait for approximately 30 seconds (until the reading of
the calibrator is stable).

• Press CFM to enter. The meter will switch to the second
calibration point. Repeat the above procedure.

• After the desired readings are obtained, press CFM and
the meter will skip back to normal operating mode.

Note When adjusting values using the  or  it is important to

allow for sufficient response time (up to 30 seconds)
The table below lists the values of output codes along with

the calibration point values (which are the analog output
minimum and the analog output maximum) as indicated
on the display.

The secondary display indicates the current calibration point
value, while primary display indicates the current calibra­tion type.

• Immerse the temperature probe in
the second beaker as near to the
Checktemp as possible and repeat
the above procedure.

Calibration procedure may be interrupted by pressing CAL
again at any time. If the calibration procedure is stopped
this way, or if the controller is switched off before the last
step, no calibration data is stored in non-volatile memory
(EEPROM).

ANALOG OUTPUT CALIBRATION

In the meters where the analog output is available, this
feature is factory calibrated through software. The user may
also perform these calibration procedures.

IMPORTANT It is recommended to perform the output calibration at least

once a year. Calibration should only be performed after
10 minutes from power up.

• With a multimeter or an HI 931002
connect the common port to the
ground output and the second port
to the current output or voltage out­put (depending on which parameter
is being calibrated).

• Press and hold in sequence CFM first, then  and then
CAL to enter the Analog Output Calibration mode.

• Execute the password procedure.

• The primary display will show the current selected param­eter blinking. Use the  to select the code (0-5 see chart
below) for the desired parameter displayed on the second­ary display (e.g. 4-20 mA).

50 °C

(122 °F)

°C

3938

LAST CALIBRATION DATA

The meter stores the following information about last calibration in
the EEPROM:

• Date

• Time

• Offset in mV (for pH 500 only)

• Up to two slopes (for pH 500 only)

• Up to three buffers

While displaying this data, the pH controller remains in con­trol mode.

The procedure below indicates the flow for a three-point cali­bration. The sequence will vary if fewer calibration points are
used (e.g. for a one-point calibration the following data will
be displayed: date, time, offset, first slope, buffer 1 value).
For the mV 600, last calibration data includes date and time
of calibration and the values of the 2 calibration points. Dis­playing of these items follows the above sequence.

• To begin the cycle press CAL DATA. The last calibration
date will appear on the main LCD display as DD.MM
format, while the secondary display will show the year.

If the meter has never calibrated or an EEPROM reset has

occurred, no calibration data is shown when CAL DATA is
pressed. The “no CAL” message will blink for a few sec­onds, then the meter skips back to normal mode.

• Pressing  will cycle through the fol­lowing steps in reverse order, i.e. last
buffer.

OUTPUT CALIBRATION CALIBRATION CALIBRATION

TYPE CODE POINT 1 POINT 2

0-1 mA 0 0 mA 1 mA

0-20 mA 1 0 mA 20 mA

4-20 mA 2 4 mA 20 mA

0-5 Vdc 3 0 Vdc 5 Vdc

1-5 Vdc 4 1 Vdc 5 Vdc

0-10 Vdc 5 0 Vdc 10 Vdc

4140

• Press  or  again to view the second memorized buffer
at the time of last calibration. The secondary display will
show "BUF2" to indicate second buffer.

• Press  or  again to view the third memorized buffer at
the time of last calibration. The secondary display will
show "BUF3" to indicate third buffer.

• Press  or  again to return to the first CAL DATA display
(date) at the time of last calibration.

Note In any moment, by pressing LCD or CAL DATA the meter will

return to the regular operating display.

• Press  or  to view the time of last calibration. The sec­ondary display will show "HOU" to indicate hours.

• Press  or  again to view the offset in mV at the time of
last calibration. The secondary display will show "OFF"
to indicate offset.

• Press  or  again to view the first slope in mV at the time
of last calibration. The secondary display will show "SL1" to
indicate first slope.

• Press  or  again to view the second slope in mV at the
time of last calibration. The secondary display will show
"SL2" to indicate second slope.

• Press  or  again to view the first memorized buffer at
the time of last calibration. The secondary display will
show "BUF1" to indicate first buffer.

4342

FAULT CONDITIONS AND SELFTEST PROCEDURES

The fault conditions below may be detected by the software:

• EEPROM data error;

• I2C internal bus failure;

• code dead loop.

EEPROM data error can be detected through EEPROM test
procedure at startup or when explicitly requested using setup
menu.

When an EEPROM error is detected, user is given the option
to perform a reset of EEPROM. Thus the reset can be per­formed whenever needed. It may be useful to provide a means
to reset EEPROM directly (without a previous EEPROM error
detection). This is done by pressing CFM first and then SETUP,
 and CAL DATA simultaneously.

Note When an EEPROM reset has been per-

formed calibration data are reset to
default. An intermittent CAL will blink
on the display to advise the user of
this status.

A I2C failure is detected when the I2C transmission is not
acknowledged or a bus fault occurs for more than a certain
number of attempts (this can be due, for example, to dam­age sustained by one of the ICs connected to I2C bus).

If so, the controller stops any tasks and displays a perpetual
sliding message “Serial bus error” (i.e. this is a fatal error).

STARTUP

At startup the firmware release code scrolls through the LCD;
it is possible to escape from code scrolling pressing any key.

During the automatic startup the Real Time Clock (RTC) is
checked to see if a reset occurred since last software ini­tialization. In this case, the RTC is initialized with the default
date and time 01/01/1997 - 00:00. An EEPROM reset
does not affect the RTC settings.

The EEPROM is also checked to see if it is new. If this is the
case, the default values are copied from ROM and then
the device enters normal mode. Otherwise an EEPROM
checksum test is performed (the same is performed during
EEPROM selftest procedure).

If checksum is correct, normal mode is entered, otherwise
user is asked whether the EEPROM should be reset.

If EEPROM reset is requested, default values from ROM
are stored into EEPROM as would happen with a new
EEPROM.

Note that EEPROM data is composed of setup data and
calibration data. As for the setup data, the calibration data is
assigned default values when an EEPROM reset occurs. An
un-calibrated meter can perform mea­surement, though user is informed that
pH calibration (pH models) or mV cali­bration (mV models) is needed by
means a blinking “CAL” icon.

When the last calibration data is re­quired, the “no CAL” message is
displayed if no calibration procedure
was performed.

Unlike pH and mV calibration, user has no information on
calibration need for other magnitudes, other than the aware­ness that EEPROM was reset.

After an EEPROM reset, all calibrations (input and output)
have to be performed in order to obtain correct measure­ments.

4544

The colon is a useful indicator for the correct position of
squares.

Note A maximum of two keys may be pressed simultaneously to be

properly recognized.
To exit the keyboard test procedure press LCD, CAL and SETUP

simultaneously.

EEPROM SELFTEST

The EEPROM selftest procedure involves verifying the stored
EEPROM checksum. If the checksum is correct the “Stored
data good” message will be shown for a few seconds before
exiting selftest procedure.

If not, the message “Stored data error - Press  to reset
stored data or  to ignore”.

If  is pressed the EEPROM selftest procedure terminates
with no other action. Otherwise, EEPROM is reset with de­fault values from ROM as when a device with a virgin
EEPROM is switched on.

During EEPROM reset a blinking mes­sage “Set MEM” is shown on the LCD.

At the end of this operation all the pa­rameters are reset to their default
values. Calibration data is also reset.
For this reason the "CAL" flag blinks
until the pH calibration is performed.

The error detection for dead loops is performed by watchdog
(see below).

You can use special setup codes, perform selftest procedures
for LCD, keyboard, EEPROM, relays and LEDs, watchdog.
The operation of these functions is outlined in the setup sec­tion. The selftest procedures are described in detail in the
following subsections.

DISPLAY SELFTEST

The display selftest procedure consists of lighting up all of the
display segments together. The Display test is announced by a
scrolling "Display test" message.

The segments are lit for a few seconds and
then switched off before exiting the selftest
procedure.

KEYBOARD SELFTEST

The keyboard selftest procedure begins with the message “But­ton test, press LCD, CAL and SETUP together to escape”. The
LCD will then show only a colon.

As soon as one or more keys are pressed, the appropriate
segments out of 88:88 corresponding to the pressed keys,
will light up on the screen.

For example, if SETUP and  are pressed together the LCD will
look like this:

4746

pH VALUES AT VARIOUS TEMPERATURES

Temperature has a significant effect on pH. The calibration
buffer solutions are effected by temperature changes to a lesser
degree than normal solutions.

For manual temperature calibration please refer to the fol­lowing chart:

TEMP pH VALUES

°C °F 4.01 7.01 10.01

0 32 4.01 7.13 10.32

5 41 4.00 7.10 10.24

10 50 4.00 7.07 10.18

15 59 4.00 7.04 10.12

20 68 4.00 7.03 10.06

25 77 4.01 7.01 10.01

30 86 4.02 7.00 9.96

35 95 4.03 6.99 9.92

40 104 4.04 6.98 9.88

45 113 4.05 6.98 9.85

50 122 4.06 6.98 9.82

55 131 4.07 6.98 9.79

60 140 4.09 6.98 9.77

65 149 4.11 6.99 9.76

70 158 4.12 6.99 9.75

For instance, if the buffer temperature is 25°C, the display
should show pH 4.01, 7.01 or 10.01 at pH 4, 7 or 10
buffers, respectively.

At 20°C, the display should show pH 4.00, 7.03 or 10.06.
The meter reading at 50°C will then be 4.06, 6.98 or 9.82.

RELAYS AND LEDS

Relays and LEDs selftests are executed as follows:
First all of the relays and LEDs are switched off, then they are

switched on one at a time for a few seconds and cyclically.
User can interrupt the otherwise endless cycle, as indicated
by the scrolling message, by pressing a key.

Note Relays and LEDs test has to be carried out with the relay

contacts disconnected from external plant devices.

WATCHDOG

When a dead loop condition is detected a reset is automati­cally invoked.

The effectiveness of watchdog capability can be tested through
one of the special setup items. This test consists of executing
a dummy dead loop that causes watchdog reset signal to be
generated.

4948

If the bulb and/or junction are dry, soak the electrode in
HI70300 storage solution for at least one hour.

For refillable electrodes**: If the refill solution (electrolyte) is more than 2½ cm (1")

below the fill hole, add HI 7082 3.5M KCl electrolyte solu­tion for double junction or HI 7071 3.5M KCl+AgCl
electrolyte solution for single junction electrodes.

For AmpHel

®

electrodes: If the electrode does not respond to pH changes, the battery

is run down and the electrode should be replaced.

TEST MEASUREMENT

Rinse the electrode tip with distilled water.
Immerse the tip (bottom 4 cm / 1½") in the sample and stir

gently for approximately 30 seconds.
For a faster response and to avoid cross contamination of

the samples, rinse the electrode tip with the solution to be
tested, before taking your measurements.

STORAGE

To minimize clogging and assure a quick response time,
the glass bulb and the junction should be kept moist and
not allowed to dry out. This can be achieved by installing
the electrode in such a way that it is constantly in a well
filled with the sample (stream or tank).

When not in use, replace the solution in the protective cap
with a few drops of HI 70300 storage solution or, in its
absence, HI 7007 pH 7.01 buffer solution.

Follow the Preparation Procedure above before taking mea­surements.

Note NEVER STORE THE ELECTRODE IN DISTILLED OR DEION-

IZED WATER.

PERIODIC MAINTENANCE

Inspect the electrode and the cable. The cable used for the
connection to the controller must be intact and there must
be no points of broken insulation on the cable or cracks on
the electrode stem or bulb.

Connectors must be perfectly clean and dry. If any scratches
or cracks are present, replace the electrode. Rinse off any salt
deposits with water.

ELECTRODE CONDITIONING AND MAINTENANCE

* Only available with refillable electrodes. For industrial applications, gel-filled electrodes are preferable

due to lesser maintenance requirements.

PREPARATION

Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE

PRESENT.
This is normal with electrodes and they will disappear when

rinsed with water.
During transport tiny bubbles of air may have formed in-

side the glass bulb. The electrode cannot function properly
under these conditions. These bubbles can be removed by
"shaking down" the electrode as you would do with a glass
thermometer.

5150

• No Slope:

- Check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found).

- Make sure cable and connections are not damaged nor
lying in a pool of water or solution.

• Slow Response/Excessive Drift: soak the tip in the HI 7061
solution for 30 minutes, rinse thoroughly in distilled water
and then follow the Cleaning Procedure above.

• For ORP Electrodes: polish the metal tip with a lightly abra­sive paper (paying attention not to scratch the surface)
and wash thoroughly with water.

Note With industrial applications, it is always recommended to

keep at least one spare electrode handy. When anomalies
are not resolved with a simple maintenance, change the
electrode (and recalibrate the controller) to see if the prob­lem is alleviated.

For refillable electrodes**: Refill the electrode with fresh electrolyte (HI 7071 for single

junction or HI 7082 for double junction electrodes). Allow
the electrode to stand upright for 1 hour. Follow the Stor­age Procedure above.

CLEANING PROCEDURE

General Soak in Hanna HI 7061 general cleaning

solution for approximately 30 minutes.
Removal of films, dirt or deposits on the membrane/junction:
Protein Soak in Hanna HI 7073 protein cleaning so-

lution for 15 minutes.
Inorganic Soak in Hanna HI 7074 inorganic cleaning

solution for 15 minutes.
Oil/grease Rinse with Hanna HI 7077 Oil & Fat cleaning

solution.

IMPORTANT After performing any of the cleaning procedures rinse the

electrode thoroughly with distilled water, drain and refill
the reference chamber with fresh electrolyte, (not neces­sary for gel-filled electrodes) and soak the electrode in
HI70300 storage solution for at least one hour before rein­stalling it.

TROUBLESHOOTING

Evaluate your electrode performance based on the following.

• Noise (Readings fluctuate up and down) could be due to:

- Clogged/Dirty Junction: refer to the Cleaning Procedure
above.

- Loss of shielding due to low electrolyte level (in refillable
electrodes only): refill with HI 7071 for single junction
or HI 7082 for double junction electrodes.

• Dry Membrane/Junction: soak in HI 70300 storage solu­tion for at least 1 hour. Check to make sure the installation
is such as to create a well for the electrode bulb to con­stantly remain moist.

• Drifting: soak the electrode tip in warm Hanna HI 7082
solution for one hour and rinse tip with distilled water (refill
with fresh HI7071 for single junction electrodes and
HI7082 for double junction electrodes if necessary).

• Low Slope: refer to the cleaning procedure above.

5352

pH mV pH mV pH mV pH mV pH mV

0 990 1 920 2 860 3 800 4 740

5 680 6 640 7 580 8 520 9 460

10 400 11 340 1 2 280 13 220 14 160

Reducing pretreatment: immerse the electrode for a few min­utes in HI 7091.

Oxidizing pretreatment: immerse the electrode for a few min­utes in HI 7092.
If the pretreatment is not performed, the electrode will take
significantly longer to respond.

As with pH electrodes, gel-filled redox electrodes are more
suitable for industrial applications due to lesser mainte­nance requirements. However, if working with refillable
electrodes, the electrolyte level should not fall more than
2½ cm (1") below the fill hole and topped up if necessary.
Use HI 7071 Refill Solution for single junction and HI 7082
for double junction electrodes.

In the event that measurements are performed with solu­tions containing sulfides or proteins, the cleaning of the
diaphragm of the reference electrode must be performed
more often to maintain the proper functioning of the ORP
electrode. Therefore, immerse it into HI 7020 and mea­sure the response; the obtained value should be within
200 and 275 mV.
After this functional test, it is suggested to wash the elec­trode thoroughly with water and proceed to the oxidizing
or reducing pretreatment before taking measurements.

When not in use, the electrode tip should be kept moist
and far from any type of mechanical stress which might
cause damage. This can be achieved by installing the elec­trode in such a way that it is constantly in a well filled with
the sample (stream or tank). The protective cap can also
be filled with HI 70300 Storage Solution if the electrode is
not being used at all.

Note With industrial applications, it is always recommended to

keep at least one spare electrode handy. When anomalies
are not resolved with a simple maintenance, change the elec­trode to see if the problem is alleviated.

TAKING REDOX MEASUREMENTS

Redox measurements allow the quantification of the oxidizing
or reducing power of a solution, and are commonly expressed
in mV.
Oxidation may be defined as the process during which a
molecule (or an ion) loses electrons and reduction as the
process by which electrons are gained.

Oxidation is always coupled together with reduction so
that as one element gets oxidized, the other is automati­cally reduced, therefore the term oxidation-reduction is
frequently used.

Redox potentials are measured by an electrode capable of
absorbing or releasing electrons without causing a chemical
reaction with the elements with which it comes into contact.
The electrodes most usually available for this purpose have
gold or platinum surfaces; gold possesses a higher resis­tance than platinum in conditions of strong oxidation such
as cyanide, while platinum is preferred for the measure­ments of oxidizing solutions containing halides and for
general use.

When a platinum electrode is immersed in an oxidizing
solution a monomolecular layer of oxygen is developed
on its surface. This layer does not prevent the electrode
from functioning, but it increases the response time. The
opposite effect is obtained when the platinum surface ab­sorbs hydrogen in the presence of reducing mediums. This
phenomenon is rough on the electrode.

To make correct redox measurements the following condi-

tions must prevail:
– The surface of the electrode must be cleaned and smooth.
– The surface of the electrode must undergo a pretreat-

ment in order to respond quickly.

Because the Pt/PtO system depends on the pH, the pre-

treatment of the electrode may be determined by the pH

and the redox potential values of the solution to be mea-

sured.

As a general rule, if the ORP mV reading corresponding to

the pH value of the solution is higher than the values in the

table below, an oxidizing pretreatment is necessary; other-

wise a reducing pretreatment is necessary:

5554

ACCESSORIES

pH CALIBRATION SOLUTIONS

HI 7004M pH 4.01 buffer solution, 230 mL bottle
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 7004/L p H 4.01 buffer solution, 1 L bottle
HI 7007M pH 7.01 buffer solution, 230 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 7007/L p H 7.01 buffer solution, 1 L bottle
HI 7010M pH 10.01 buffer solution, 230 mL bottle
HI 7010L pH 10.01 buffer solution, 500 mL bottle
HI 7010/L p H 10.01 buffer solution, 1 L bottle

ORP SOLUTIONS

HI 7020M ORP test solution at 200-275 mV, 230 mL bottle
HI 7020L ORP test solution at 200-275 mV, 500 mL bottle
HI 7091M Reducing pretreatment solution, 230 mL bottle
HI 7091L Reducing pretreatment solution, 500 mL bottle
HI 7092M Oxidizing pretreatment solution, 230 mL bottle
HI 7092L Oxidizing pretreatment solution, 500 mL bottle

ELECTRODE MAINTENANCE SOLUTIONS

HI 70300M Storage solution, 230 mL bottle
HI 70300L Storage solution, 500 mL bottle
HI 7061M General cleaning solution, 230 mL bottle
HI 7061L General cleaning solution, 500 mL bottle
HI 7073M Protein cleaning solution, 230 mL bottle
HI 7073L Protein cleaning solution, 500 mL bottle
HI 7074M Inorganic cleaning solution, 230 mL bottle
HI 7074L Inorganic cleaning solution, 500 mL bottle
HI 7077M Oil & Fat cleaning solution, 230 mL bottle
HI 7077L Oil & Fat cleaning solution, 500 mL bottle
HI 7071 3.5M KCl+AgCl electrolyte solution, 4x50 mL bottle, for single

junction electrodes

HI 7072 1M K NO

3

electrolyte solution, 4x50 mL bottle

HI 7082 3.5M KCl electrolyte solution, 4x50 mL bottle, for double junc-

tion electrodes

RECOMMENDED pH ELECTRODES (all electrodes are gel-filled and with ce­ramic junction unless otherwise indicated).

HI 1090T Screw connector, external PG13.5 thread, double junction,

glass body, polymer filled

HI 1210T Screw connector, external PG13.5 thread, double junction,
HI 1211T Plastic body; cloth junction (HI 1210T); PVDF junction, poly-

mer-filled (HI 1211T)

HI 2910B/5 BN C connector, 5 m (16.5') cable, double junction, plastic
HI 2911B/5 body with built-in amplifier and external thread; cloth junction

(HI 2910B/5); PVDF junction, polymer-filled (HI 2911B/5)

HI 1090B/5 BNC connector, 5 m (16.5') cable, double junction, glass

body, polymer-filled

HI 1210B/5 BNC connector, 5 m (16.5') cable, double junction, plastic

body, PVDF junction, polymer-filled

5756

HI 3210B/5 BNC connector, 5 m (16.5') cable, double junction, Pt, plas-

tic body, PVDF junction, polymer-filled

GOLD ORP ELECTRODES

HI 4932B/5 BNC connector, 5 m (16.5') cable, double junction, Au, plastic

body with built-in amplifier and external thread

ELECTRODES FOR HIGH PRESSURE APPLICATIONS

pH ELECTRODES

½‘’ thread, double PVDF junction, polymer filled, max operating pressure of 6 bar (87
psi)

Part Code Matching Pin Amplifier Connector Cable

HI 1002/3 NO NO BNC 3 m (10’)
HI 1002/5 NO NO BNC 5 m (16.5’)
HI 1003/3 YES NO BNC* 3 m (10’)
HI 1003/5 YES NO BNC* 5 m (16.5’)
HI 1004/5 YES YES spade lugs* 5 m (16.5’)
* In addition to the electrode connector, there is also a spade lug connection for the

matching pin

PLATINUM ORP ELECTRODES

HI 3090T Screw connector, external PG13.5 thread, double junction,

Pt, glass body, polymer filled

HI 3210T Screw connector, external PG13.5 thread, double junction,

Pt, plastic body, cloth junction

HI 3211T Screw connector, external PG13.5 thread, double junction,

Pt, plastic body, PVDF junction, polymer-filled

HI 2930B/5 BNC connector, 5 m (16.5') cable, double junction, Pt, plas-

tic body with built-in amplifier and external thread, cloth

junction

HI 2931B/5 BNC connector, 5 m (16.5') cable, double junction, Pt, plas-

tic body with built-in amplifier and external thread, PVDF

junction, polymer-filled

HI 3090B/5 BNC connector, 5 m (16.5') cable, double junction, Pt, glass

body, polymer-filled

5958

ORP ELECTRODES

½‘’ thread, double PVDF junction, polymer filled, max operating pressure of 6 bar (87
psi)

PLATINUM ELECTRODES

Part Code Matching Pin Amplifier Connector Cable

HI 2002/3 NO NO BNC 3 m (10’)
HI 2002/5 NO NO BNC 5 m (16.5’)
HI 2003/3 YES NO BNC* 3 m (10’)
HI 2003/5 YES NO BNC* 5 m (16.5’)
HI 2004/5 YES YES spade lugs* 5 m (16.5’)

GOLD ELECTRODES

Part Code Matching Pin Amplifier Connector Cable

HI 2012/3 NO NO BNC 3 m (10’)
HI 2012/5 NO NO BNC 5 m (16.5’)
HI 2013/3 YES NO BNC* 3 m (10’)
HI 2013/5 YES NO BNC* 5 m (16.5’)
HI 2005/5 YES YES spade lugs* 5 m (16.5’)

* In addition to the electrode connector, there is also a spade lug connection for the
matching pin

OTHER ACCESSORIES

BL PUMPS Dosing pumps with flow rate from 1.5 to 20 lph
HI 98501 ChecktempC Electronic thermometer (range -50.0 to 150.0°C)
HI 98502 ChecktempF Electronic thermometer (range -58.0 to 302°F)
HI 6050 & HI 6051 Submersible electrode holders
HI 6054 & HI 6057 Electrode holders for in-line applications
HI 778P Screened coaxial cable with screw connectors
HI 7871 & HI 7873 Level controllers
HI 8427 pH/ORP electrode simulator
HI 8614 pH transmitter
HI 8614L pH transmitter with LCD
HI 8615 ORP transmitter
HI 8615L ORP transmitter with LCD
HI 920010 RS232 connection cable
HI 92500 Windows

®

compatible software
HI 931001 pH/ORP electrode simulator with LCD
HI 931002 4-20 mA simulator

6160

OTHER PRODUCTS FROM HANNA

• CALIBRATION AND MAINTENANCE SOLUTIONS

• CHEMICAL TEST KITS

• CHLORINE METERS

• CONDUCTIVITY/TDS METERS

• DISSOLVED OXYGEN METERS

• HYGROMETERS

• ION SPECIFIC METERS

• MAGNETIC STIRRERS

• Na/NaCl METERS

• pH/ORP/Na ELECTRODES

• PROBES (DO, µS/cm, RH, T, TDS)

• PUMPS

• REAGENTS

• SOFTWARE

• THERMOMETERS

• TITRATORS

• TRANSMITTERS

• TURBIDITY METERS

• Wide Range of Accessories

Most Hanna meters are available in the following formats:

• BENCH-TOP METERS

• POCKET-SIZED METERS

• PORTABLE METERS

• PRINTING/LOGGING METERS

• PROCESS METERS (Panel and Wall-mounted)

• METERS FOR FOOD INDUSTRY

For additional information, contact your dealer or the near­est Hanna Customer Service Center.
You can also e-mail us at [e-mail].

WARRANTY

All Hanna Instruments meters are guaranteed for two
years against defects in workmanship and materials when

used for their intended purpose and maintained accord­ing to instructions. The electrodes and the probes are
guaranteed for a period of six months. This warranty is
limited to repair or replacement free of charge.

Damage 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.

Hanna Instruments reserves the right to modify the design,
construction and appearance of its products without ad­vance notice.

6362

CE DECLARATION OF CONFORMITY

Recommendations for Users

Before using these products, make sure that they are entirely suitable for
the environment in which they are used.

Operation of these instruments in residential areas could cause unaccept­able interferences to radio and TV equipment.

To maintain the EMC performance of equipment, the recommended
cables noted in the user's manual must be used.

Any variation introduced by the user to the supplied equipment may
degrade the instruments' EMC performance.

To avoid electrical shock, do not use these instruments when voltage at the
measurement surface exceed 24 Vac or 60 Vdc.

To avoid damage or burns, do not perform any measurement in
microwave ovens.

Unplug the instruments from power supply before the replacement of the
fuse.

External cables to be connected to the rear panel should be terminated with
cable lugs.

HANNA LITERATURE

Hanna publishes a wide range of catalogs and handbooks
for an equally wide range of applications. The reference lit­erature currently covers areas such as:

• Water Treatment

• Process

• Swimming Pools

• Agriculture

• Food

• Laboratory

• Thermometry

and many others. New reference material is constantly being
added to the library.

For these and others catalogs, handbooks and leaflets, con­tact your dealer or the Hanna Customer Service Center nearest
to you. To find the Hanna Office in your vicinity, check our
home page at www.hannainst.com

MANPH500R6 08/05

TECHNICAL SERVICE CONTACTS

Australia: Tel. [phone] • Fax [phone]

China: Tel. [phone] • Fax [phone]

Egypt: Tel. & Fax [phone]

Germany: Tel. [phone] • Fax [phone]

Greece: Tel. [phone] • Fax [phone]

Indonesia: Tel. [phone] • Fax [phone]

Japan: Tel. [phone] • Fax [phone]

Korea: Tel. [phone] • Fax [phone]

Malaysia: Tel. [phone] • Fax [phone]

Singapore: Tel. [phone] • Fax [phone]

South Africa: Tel. [phone] • Fax [phone]

Taiwan: Tel. [phone] • Fax [phone]

Thailand: Tel. [phone] • Fax [phone]

United Kingdom: Tel. [phone] • Fax [phone]

USA: Tel. [phone] • Fax [phone]

For additional Technical Support in your local language,

see www.hannainst.com