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