Hanna Instruments HI 23 Series User manual

1
HI 23 / HI 24 Series
Wall-mounted,
Microprocessor-based,
Conductivity and TDS
Process Controllers
Instruction Manual

2
Dear Customer,
Thank you for choosing a Hanna Product.
This instruction manual refers to the following products:
HI 23211-αα
αα
αEC controller with dual setpoint, ON/OFF
control and analog output
HI 23212-αα
αα
αEC controller with dual setpoint, ON/OFF
control and RS 485 port
HI 23221-αα
αα
αEC controller with dual setpoint, ON/OFF
and PID control, and analog output
HI 23222-αα
αα
αEC controller with dual setpoint, ON/OFF
and PID control, and RS 485 port
HI 24211-αα
αα
αEC and TDS controller with dual setpoint,
ON/OFF control and analog output
HI 24212-αα
αα
αEC and TDS controller with dual setpoint,
ON/OFF control and RS 485 output
HI 24221-αα
αα
αEC and TDS controller with dual setpoint,
ON/OFF and PID control, and analog out-
put
HI 24222-αα
αα
αEC and TDS controller with dual setpoint,
ON/OFF and PID control, and RS 485 port
αα
αα
α =1, for models with 115 Vac power supply
2, for models with 230 Vac power supply
Please read this instruction manual carefully before using the
instrument. It will provide you with the necessary information
for the correct use of the instrument, as well as a precise idea
of its versatility.
If you need additional technical information, do not hesitate
to e-mail us at [email protected][email protected]
[email protected][email protected]
[email protected]
These instruments are in compliance with the directives.

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TABLE OF CONTENTS
PRELIMINARY EXAMINATION ............................................4
GENERAL DESCRIPTION ................................................. 4
MAIN FEATURES OF DIFFERENT MODELS ......................... 5
FUNCTIONAL DESCRIPTION ............................................7
MECHANICAL DIMENSIONS ............................................9
SPECIFICATIONS .......................................................... 10
INSTALLATION .............................................................. 11
SETUP MODE .............................................................. 14
CONTROL MODE ........................................................ 21
IDLE MODE ................................................................. 29
ANALOG OUTPUT ....................................................... 30
CALIBRATION ...............................................................32
LAST CALIBRATION DATA ............................................... 40
FAULT CONDITIONS AND SELFTEST PROCEDURES ........... 41
EXTERNAL FUNCTIONS ................................................. 45
RS 485 COMMUNICATION ............................................46
STARTUP ......................................................................53
EC VALUES AT VARIOUS TEMPERATURES ..........................54
EC / TDS PROBE MAINTENANCE ................................... 55
ACCESSORIES .............................................................. 56
WARRANTY ................................................................. 58
CE DECLARATION OF CONFORMITY ............................. 59
© 2001 Hanna Instruments
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent
of the copyright owner.

4
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and exam-
ine 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
HI 23 and HI 24 series are real time microprocessor-based
EC or TDS controllers. They provide accurate measurements,
flexible ON/OFF or proportional control capabilities, ana-
log input and output, dual setpoint and alarm signal.
The system is composed of a case inside which the signal
conversion circuitry, the microprocessor circuitry and the
output power drivers are contained.
GREAT FLEXIBILITY
The HI 23 and HI 24 controller series offer a great flexibility
with the possibility to connect a large variety of peripherals,
such as pumps, valves, relays and other control devices.
Each output can be fully programmed. The input can be
from a conductivity probe or from a 4-20mA transmitter. A
programmable analog output can be used for monitoring or
other purposes.
The controller also has the capability to communicate with a
computer via RS485 bus and to be part of an RS485 net-
work.
This allows the control of any process where conductivity is
involved.
The figure below illustrates the connection possibilities of ad-
vanced Hanna controllers, such as HI 23 or HI 24.

5
MAIN FEATURES OF DIFFERENT MODELS
•Display: large LCD with 4 ½ 13 mm digits and 3 ½ 7.7 mm
digits.
•LEDs: four LEDs are provided for signaling the energizing
of relays 1 and 2 (yellow LEDs) and alarm relay (a green
and a red LED).
•Relays: 2 output relays for low conductivity or high con-
ductivity dosage (COM, NO and NC contacts) and
1 output relay for alarm condition (COM, NO and NC
contacts).

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•Calibration: 2 points with Hanna EC and TDS calibration
solutions.
•Four different EC working ranges (0 to 199.9µS; 0 to
1999µS; 0 to 19.99mS; 0 to 199.9mS).
•Four different TDS working ranges (0 to 100.0ppm; 0 to
1000ppm; 0 to 10.00ppt; 0 to 100.0ppt) for HI 24 series.
•Possibility to switch to TDS measurements with conversion
factor from 0.00 to 1.00 (HI 24 series).
•Temperature compensation of the HANNA standard solu-
tions.
•Temperature compensation of the EC and TDS reading with
temperature coefficient ß selectable from 0 to 10%/°C.
•Use of a 3-wire Pt 100 temperature sensor to compensate
for the cable resistance and have a precise automatic tem-
perature compensation of the measurements in long dis-
tance applications.
•Manual temperature setting when the temperature probe is
not inserted or the temperature exceeds the upper range.
•Last calibration data internally recorded (nonvolatile EE-
PROM memory): calibration date and time, cell constant,
calibration solution values.
•Input: 4-ring EC/TDS probe with cell constant 2.0 ± 10%,
or 4-20mA analog input from a transmitter.
•Analog output (HI 23xy1 and HI 24xy1)
-isolated 0-1 mA, 10 KΩmaximum load (optional);
-isolated 0-20 mA, 750 Ωmaximum load (optional);
-isolated 4-20 mA, 750 Ωmaximum load (optional);
-isolated 0-5 VDC, 1 KΩminimum load (optional);
-isolated 1-5 VDC, 1 KΩminimum load (optional);
-isolated 0-10 VDC, 1 KΩminimum load (optional).
•Real time clock.
•Serial comunication via RS485 with the possibilities to set
the working parameters and to read the displayed data (HI
23xy2 and HI 24xy2).
•Calibration and Setup procedures allowed only through
an unlock password.

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FUNCTIONAL DESCRIPTION
1. Liquid Crystal Display
2. CAL DATA key last calibration data viewing (enters and exits)
3. LCD key exits from setup and reverts back to normal mode (in idle
or control phases with the measurement on the display).
During EC/TDS calibration, it alternates EC/TDS buffer
value and current cell constant on the display. In HI 24
series, it switches between EC and TDS reading
4. CAL key initiates and exits calibration mode
5. SETUP key enters setup mode
6. ðkey moves to the next digit/letter (circular solution) when se-
lecting a parameter. Same as ñkey during last calibration
data viewing mode
7. ñkey 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
8. CFM key confirms current choice (and skips to the next item)
9. òkey 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
10. LEDs

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1. RS 485 communications terminal (HI 23xy2 and HI 24xy2
models only)
2. Analog Output terminal (HI 23xy1 and HI 24xy1 models only)
3. Pt 100 Temperature Sensor terminal
4. Power supply output for external transmitter
5. 4-20 mA input from external transmitter
6. Main Power Supply
7. Alarm Terminal
8. Contact 1 - First Dosing Terminal
9. Contact 2 - Second Dosing Terminal
10. EC/TDS probe connector
11. Hold terminal
12. Timer terminal
Unplug the meter before any electrical connection.
Note The connections of terminals 1 to 5 are numbered from 1 to 15
from top to bottom and the connections of terminals 11 and 12
are numbered from 16 to 19 from top to bottom.

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MECHANICAL DIMENSIONS

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* Note: actual TDS range for HI 24 series depends on TDS factor set.
SPECIFICATIONS
Range 0.0 to 199.9 µS/cm, 0 to 1999 µS/cm
0.00 to 19.99 mS/cm, 0.0 to 199.9 mS/cm
0.0 to 100.0 ppm, 0 to 1000 ppm (HI 24 series only)**
**
*
0.00 to 10.00 ppt, 0.0 to 100.0 ppt (HI 24 series only)**
**
*
-10.0 to 100.0 °C
Resolution 0.1 µS/cm, 1 µS/cm, 0.01 mS/cm, 0.1 mS/cm
0.1 ppm, 1 ppm, 0.01 ppt, 0.1 ppt (HI 24 series only)
0.1 °C
Accuracy ±0.5 % full scale (EC and TDS)
(@20°C/68°F) ±0.5°C between 0 to 70°C, ±1°C outside
Temperature Automatic or manual, -10 to 100°C
Compensation with β adjustable from 0.00 to 10.00%/°C
Typical EMC Deviation ±2 % full scale (EC and TDS) / ±0.5 °C
Installation Category II
Probe 4-ring conductivity probe with built-in 3-wire Pt100
temperature sensor or conductivity probe + external Pt100
(see “Accessories” section)
Analog Input 4 - 20 mA
Analog Output 0-10 Vdc, 0-5 Vdc or 1-5 Vdc; 0-1mA, 0-20 mA or 4-20mA
RS485 baud rate 1200, 2400, 4800 and 9600
Power Supply 230 ±10% VAC or 115 ±10% VAC, 50/60 Hz
Power Consumption 15 VA
Over Current Protection 400 mA 250 V fast fuse
Relays 1, 2 and Contact outputs SPDT, 5A-250 VAC, 5A-30 VDC (resistive load)
Alarm Relay Fuse protected: 5A, 250V fuse
Environment 0-50 °C; RH max 85% non-condensing
Case Material Fiber-reinforced, self-extinguishing ABS
Protection IP 54
Dimensions 221 x 181 x 86 mm (8.7 x 7.1 x 3.4”)
Weight 1.6 kg (3.5 lb.)

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INSTALLATION
HI 23 and HI 24 series offer a multitude of possibilities,
from dual setpoints to ON/OFF or PID dosage, isolated out-
puts with user-selectable zoom, recorder outputs in mA and
volts.
Use the 3-wire Pt 100 temperature sensor to compensate for
the cable resistance and have a precise automatic tempera-
ture compensation of the measurements in long distance
applications.
See the below diagram for a recommended installation.
Note All external cables to be connected to the right panel should
end with cable lugs.
Use wires with cable lugs when connecting to the strip con-
tacts.
Always disconnect the power cord when wiring the controller.

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••
••
•PP
PP
Power Supply:ower Supply:
ower Supply:ower Supply:
ower 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: 230VAC - 50 mA.
Line Contact: 200mA fuse inside.
PE leakage current 1 mA; this contact must be con-
nected to ground.
• Conductivity input:• Conductivity input:
• Conductivity input:• Conductivity input:
• Conductivity input: the default input is from conductivity
probe. Connect the EC probe to the terminals #10 on
page 8. HI7639D is a conductivity probe with built-in tem-
perature sensor.
••
••
•Pt 100 TPt 100 T
Pt 100 TPt 100 T
Pt 100 Terminalserminals
erminalserminals
erminals (to be used only if the EC probe is
without Pt 100): connect to these contacts (#3 on page 8)
the Pt 100 temperature sensor for automatic temperature
compensation of measurement. Follow the below diagram
for connecting a 3-wire Pt 100 sensor as HI5001/5:
Color Pin #
GRAY8
BROWN 9
YELLOW 10
If using a different Pt 100, separated from the conductivity
probe, connect the cable shield to pin 11, and the other
wires as explained below.
In the case of a 2-wire sensor connect
the Pt 100 to pins 8 and 10, and short
pins 9 and 10 with a jumper wire.

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If the Pt 100 has more than 2 wires, con-
nect the two wires of one end to pins 9
and 10 (pin 9 is an auxiliary input to
compensate for the cable resistance) and
one wire from the other end to pin 8.
Leave the fourth wire unconnected, if
present.
Note If the meter does not detect the temperature probe, it will
switch automatically to manual temperature compensation
with the temperature adjustable through the up and down
arrow keys. The “°C” symbol will blink on the LCD.
Note All external cables to be connected to the right panel should
end with cable lugs.
•Analog output:Analog output:
Analog output:Analog output:
Analog output: In the models where it
is available, connect an external recorder
with a 2-wire cable to these terminals
(#2 on page 8) paying attention to the
correct polarity. A wide variety of output
signals, either in V or in mA, is avail-
able to fit most standards. Terminal 5 is the voltage output,
terminal 6 is the analog output common and terminal 7 is
the current output.
•Contact 1 and 2:Contact 1 and 2:
Contact 1 and 2:Contact 1 and 2:
Contact 1 and 2: Connect the dosing
devices to these terminals (#8 and #9
on page 8) in order to activate and de-
activate them according to the selected
control parameters.
•mA Input:mA Input:
mA Input:mA Input:
mA Input: to switch to mA input signal
from a conductivity transmitter (e.g.
HI8936 or HI98143 series) see the setup
procedure (code 6).

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Connect the two signal wires from the transmitter to terminals
#5 on page 8, paying attention to the correct polarity. Termi-
nal 14 is the positive input and terminal 15 is the negative
input.
An unregulated 10 ÷ 30 VDC - 50 mA max.
power supply output (#4 on page 8) is pro-
vided to power the transmitter, if needed. Pin
12 is the positive voltage terminal and pin 13
is the negative voltage terminal.
Once the installation is completed, select the appropriate
working range, the reference temperature (20 or 25°C) and
perform conductivity or TDS calibration as described in this
instruction manual. Set the control parameters according
to the process of interest.
SETUP MODE
The Setup Mode allows the user to set all needed character-
istics 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.
To each setup parameter (or setup item) is assigned a two-
digit setup code which is entered and displayed on the
secondary LCD.

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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 ñor òkeys.
•Then confirm the displayed digit with ðand move to the
next one.
•When the whole password has been inserted, press CFM
to confirm it.

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Note The default password is set at “0000”.
•The LCD will display “SET” on the up-
per part and “c.00” on the lower, al-
lowing the user to edit setup param-
eters (see table below).
•Using the arrow keys as for the above password proce-
dure, enter the code of the parameter to set, 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 memo-
rized 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.
•After confirmation, the selected parameter is
displayed. The user can scroll through the
parameters by pressing CFM.
•In order to directly set another param-
eter, press SETUP again and enter the
code or scroll to it by pressing CFM.

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SETUP CODES
The following table lists the setup codes along with the descrip-
tion 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 99 00 no
02 Control enable/disable 0: C.M. disabled 0no
1: C.M. enabled
03 Range 1: 0.0-199.9 µS (or 100.0 ppm) 4no
(depends on model) 2: 0-1999 µS (or 1000 ppm)
3: 0.00-19.99 mS (or 10.00 ppt)
4: 0.0-199.9 mS (or 100.0 ppt)
04 Reference Temperature 20°C or 25°C 25°C no
05 Temperature Coefficient 0.00 to 10.00 %/°C 2.00 no
06 Input Selection 0: conductivity probe 0no
1: 4-20 mA input signal
07 Temperature ATC: Automatic ATC no
compensation User: Manual
08 TDS Factor 0.00 to 1.00 0.50 no
11 Relay 1 mode 0: disabled 0no
(M1) 1: ON-OFF high setpoint
2: ON-OFF low setpoint
3: PID, high setpoint
4: PID, low setpoint
12 Relay 1 setpoint (S1) 0.5 to 99.5% full scale 25% f.s. no
13 Relay 1 hysteresis (H1) 0 to 5% f.s. 1% f.s. no
14 Relay 1 deviation (D1) 0.5 to 10% f.s. 1% f.s. no
15 Relay 1 reset time 0.1 to 999.9 minutes 999.9 no
16 Relay 1 rate time 0.0 to 999.9 minutes 0.0 no

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Code Valid Values Default PW
21 Relay 2 mode (M2) same as relay 1 0no
22 Relay 2 setpoint (S2) 0.5 to 99.5% full scale 75% f.s. no
23 Relay 2 hysteresis (H2) 0 to 5% f.s. 1% f.s. no
24 Relay 2 deviation (D2) 0.5 to 10% f.s. 1% f.s. no
25 Relay 2 reset time 0.1 to 999.9 minutes 999.9 no
26 Relay 2 rate time 0.0 to 999.9 minutes 0.0 no
30 Alarm relay 0.5 to 99.5% full scale 95% f.s. no
High Alarm (HA) HA-HysULA+Hys,Hys=1.5%f.s.,HAUS1 or HAUS2
31 Alarm relay 0.5 to 99.5% full scale 5% f.s. no
Low Alarm (LA) LA+HysTHA-Hys,Hys=1.5%f.s.,LATS1 or LATS2
32 Proportional control 1 to 30 min 5 no
mode period
33 Maximum relay ON time 1 to 10 min 10 no
(after which an alarm mode is entered)
34 Alarm mask time 00:00 to 30:00 00:00 no
40 Analog output selection 0: 0-1mA 2no
1: 0-20 mA
2: 4-20 mA
3: 0-5 VDC
4: 1-5 VDC
5: 0-10 VDC
41 Analog output 0 to 100% full scale 0no
lower limit (O_VARMIN) (O_VARMIN TO_VARMAX - 5% f.s.)
42 Analog output 0 to 100% full scale 100% f.s. no
upper limit (O_VARMAX) (O_VARMIN TO_VARMAX - 5% f.s.)
60 Current day 01 to 31 from RTC no
61 Current month 01 to 12 from RTC no
62 Current year 1998 to 9999 from RTC no
63 Current time 00:00 to 23:59 from RTC no

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Code Valid Values Default PW
71 Baud rate 1200, 2400, 4800, 9600 4800 yes
72 Cleaning timer 0 to 19999 days 0no
73 Initial cleaning day 01 to 31 01 no
74 Initial cleaning month 01 to 12 01 no
75 Initial cleaning year 1998 to 9999 1998 no
76 Initial cleaning time 00:00 to 23:59 00:00 no
77 Cleaning ON interval 0 to 19999 minutes 0no
90 Display selftest 0: off 0yes
1: on
91 Keyboard selftest 0: off 0yes
1: on
92 EEPROM selftest 0: off 0yes
1: on
93 Relays and LEDs selftest 0: off 0yes
1: on
94 Watchdog selftest 0: off 0yes
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, “ERROR” blinks on the LCD to
prompt the user. The correct configurations are the follow-
ing:
If M1=/ 0 then S1THA, S1ULA;
If M2=/ 0 then S2THA, S2ULA;
If M1= 1 then S1-H1ULA;
If M1= 2 then S1+H1THA;
If M1= 3 then S1+D1THA;
If M1= 4 then S1-D1ULA;

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If M2= 1 then S2-H2ULA;
If M2= 2 then S2+H2THA;
If M2= 3 then S2+D2THA;
If M2= 4 then S2-D2ULA;
If M1= 1 and M2 = 2
then S1-H1US2+H2, S2ULA, HAUS1;
If M1 = 2 and M2 = 1
then S2-H2US1+H1, S1ULA, HAUS2;
If M1 = 3 and M2 = 2
then S1US2+H2, S2ULA, HAUS1+D1;
If M1 = 2 and M2 = 3
then S1+H1TS2, S1ULA, HAUS2+D2;
If M1 = 4 and M2 = 1
then S1TS2–H2, S1–D1ULA, HAUS2;
If M1 = 1 and M2 = 4
then S1–H1US2, S2–D2ULA, HAUS1;
If M1 = 3 and M2 = 4
then S1US2, S2–D2ULA, HAUS1+D1;
If M1 = 4 and M2 = 3
then S2US1, S1–D1ULA, HAUS2+D2;
where the minimum deviation (D1 or D2) is 0.5% of the maxi-
mum range value.
Note Some setup codes are available depending on the model.
Note When a wrong setup value is confirmed
or a wrong setup code is selected, the con-
troller does not skip to the next setup item
but remains in the current item displaying
a flashing “ERROR” indicator until the pa-
rameter value is changed by the user.
Note In some circumstances, the user cannot succeed in setting a
parameter to a desired value if the related parameters are not
changed beforehand; e.g. to set a EC high setpoint to 10.0
mS the high alarm must be set to a value greater than 10.0
mS first.