Hanna Instruments HI 21 Series User manual

HI21 & HI22 Series
Wall-mounted,
Microprocessor-based
pH and ORP Controllers
Instruction Manual

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© 2002 Hanna Instruments
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 Instruments Product.
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].
These instruments are in compliance with the directives.
MODELS
The models HI21XYZ are pH controllers, while the models
HI22XYZ are ORP controllers.
HI21111 pH Controller with single setpoint, ON/OFF
control, analog output
HI21211 pH Controller with dual setpoint, ON/OFF
control, analog output
HI21221 pH Controller with dual setpoint, propor-
tional and ON/OFF controls, analog output
HI21222 pH Controller with dual setpoint, propor-
tional and ON/OFF controls, RS485 output
HI21523 pH Controller with control through analog
output, proportional and ON/OFF controls,
analog and RS485 outputs
HI22111 ORP Controller with single setpoint, ON/OFF
control, analog output
HI22122 ORP Controller with single setpoint, propor-
tional and ON/OFF controls, RS485 output

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TABLE OF CONTENTS
PRELIMINARY EXAMINATION ..................4
GENERAL DESCRIPTION......................4
FUNCTIONAL DESCRIPTION ..................6
MECHANICAL DIMENSIONS. . . . . . . . . . . . . . . . . . . 7
SPECIFICATIONS HI21 & HI22.................8
INSTALLATION .............................9
SETUP MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CONTROL MODE .........................17
IDLE MODE ..............................25
ANALOG OUTPUT .........................26
RS485 COMMUNICATION & DATA LOGGING ....28
CALIBRATION ............................35
LAST CALIBRATION DATA ....................48
START-UP ................................51
FAULT CONDITIONS AND SELFTEST PROCEDURES . 52
pH VALUES AT VARIOUS TEMPERATURES .........56
ELECTRODE CONDITIONING AND MAINTENANCE 57
TAKING REDOX MEASUREMENTS ..............61
ACCESSORIES ............................63
WARRANTY ..............................69
CE DECLARATION OF CONFORMITY...........70

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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, please
contact your local Hanna Instruments Office.
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, proportional or PID 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 4 ½ 13 mm digits and 3 ½ 7.7
mm digits.
• LEDs: three (HI22) or four (HI21) LEDs are provided for
signaling the energizing of relay 1 (a yellow LED), relay
2 (a yellow LED in HI21 Series only) and alarm relays (a
green and a red LED).
• Relays: Electromechanical type, working through NO,
COM and NC contacts; 1 or 2 output relays for acid or
base dosage; 1 output relay for alarm condition.
• RS485 isolated communication link.
• Calibration and Setup procedures allowed only through
an unlock password.
• Calibration: for HI21 series at 1, 2 or 3 points with
pH4.01, 7.01 and 10.01 buffers; for HI22 series in 1
or 2 points at 0, 350 and 1900 mV.
• Temperature compensation of the Hanna Instruments
standard buffers (for HI21 series only).

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• Temperature compensation of the pH reading (for HI21
series only).
• Manual temperature setting when the temperature probe
is not inserted or temperature exceeds the upper range.
• Internally recorded last calibration data (non-volatile EE-
PROM memory): calibration date and time, pH offset, pH
slopes, number of calibration points and correspondent
pH values (for HI21 series only) or calibration date and
time and the mV calibration points used (for HI22 series
only).
• Input: pH electrode with BNC connector.
• ±5 Vdc output for amplified electrodes (max 10 mA).
• 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.

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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 measure-
ment on the display). In HI21 series, during pH calibration,
alternately displays pH buffer value or current temperature
3. CAL DATA key last calibration data viewing (enters and exits)
4. SETUP key enters setup mode
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 moves to the next digit/letter (circular buffer) when selecting
a parameter. Same as key during last calibration data
viewing mode
8. 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
9. CFM key confirms current choice (and skips to the next item)
10. BNC Socket
11. LEDs

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CONNECTIONS PANEL
1. 4-pin RS485 terminal (not for HI21XY1 and HI22XY1)
2. Analog output (not for HI21XY2 and HI22XY2)
3. Connections for Pt 100 temperature sensor
4. ±5V power supply output
5. Connection for Potential Matching Pin
6. Connection for electrode reference
7. Power supply input (1 Potential Earth, 2 Neutral, 3 Line)
8. Alarm terminal (1 F.S. Closed, 2 COM, 3 F.S. Open)
9. Relay 1 - first dosing terminal (not for HI21523) - (1 Normally Open, 2 COM,
3 Normally Closed)
10. Relay 2 - second dosing terminal (HI212XY models only) - (1 Normally Open,
2 COM, 3 Normally Closed)
Unplug the meter before starting any electrical connections.
FRONT VIEW BOTTOM VIEW

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SPECIFICATIONS HI21 & HI22
Range
0.00 to 14.00 pH (HI21 series only)
±2000 mV (HI22 series only)
-9.9 to 120.0 °C
Resolution
0.01 pH (HI21 Series only)
1 mV (HI22 Series only)
0.1 ˚C
Accuracy
(@20 °C/68 °F)
±0.02 pH (HI21 Series only)
±2 mV (HI22 Series only)
±0.5 ˚C
Typical EMC
Deviation
±0.05 pH (HI21 Series only)
±4 mV (HI22 Series only)
1.0 ˚C
Analog Output 0 to 1 mA, 0 to 20mA, 4 to 20mA
0 to 5 Vdc, 1 to 5 Vdc, 0 to 10 Vdc
Digital Output RS485
Power Supply Input ±5V (for amplified electrodes)
Power Supply ‘‘-1’’ models: 115 ±10% Vac, 50/60 Hz
‘‘-2’’ models: 230 ±10% Vac, 50/60 Hz
Power Consumption 15 VA
Over Current Protection 450 mA, 250V, FAST FUSE
Relay 1 and 2
Electromechanical relay SPDT contact outputs,
5A- 250 Vac, 5A- 30 Vdc (resistive load)
(HI211YZ, HI212YZ and HI221YZ)
Fuse protected: 5A, 250V FAST FUSE
Alarm Relay
Electromechanical relay SPDT contact output,
5A- 250 Vac, 5A- 30 Vdc (resistive load)
Fuse protected: 5A, 250V FAST FUSE
Environment 0 to 50˚C (32 to 122 ˚F)
RH max 85% non-condensing
Protection IP54
Dimensions 221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
Weight approximately 1.4 kg. (3.1 lb.)

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INSTALLATION
HI21 and HI22 offer
a multitude of possibili-
ties, from single and dual
setpoints to ON/OFF,
proportional or PID dos-
age, isolated outputs with
user-selectable zoom,
bidirectional RS485, re-
corder outputs in mAmps
and Volts.
In addition, HI21 and
HI22 are both equipped
with the exclusive differen-
tial input.
In a system with poor
grounding, it is possible
to have a ground cur-
rent flowing through the
reference junction. This
can cause a rapid deg-
radation of the electrode.
The Hanna Instruments
differential input reduces
the likelihood of ground
loops.
See the diagram for a rec-
ommended installation.

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• 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 1 mA.
• Electrode: Connect the pH or ORP electrode to the BNC
socket (#10 at page 6).
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
(#5 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 (#5 page 7)
with the Connection for
Electrode Reference (#6 on
page 7) with a jumper wire.
• Pt 100 Terminals: these contacts (#3 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 +5V and -5V DC (max current: 10 mA) signals
to supply power to amplified electrodes.
Note All cables connected to the panel should end with cable
lugs.