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Our new line of industrial controllers offers a
wide range of features and functions such as
single and dual setpoints, ON/OFF, proportional
and PID control, relay outputs, user-selectable
zoom, bidirectional isolated RS485, isolated
recorder outputs in mAmps and volts, differential
input, control through analog output and
Fail Safe Features.
Simple-to-use
The large, dual-level LCD shows both pH (mV)
and temperature and guides operators through
calibration and programming with step-by-step
prompts. The choice of ON/OFF, proportional
and PID control provides extra versatility and
makes it possible to pick the process controller
that best fits your application. Keeping track of
multiple controllers in different plants is made
easy. These advanced controllers can be identified
with both a factory and a process ID.
Save Money with Custom Programs
The new HI 21 and HI 22 help to prevent
overdosing or costly system failures. You can
set your high and low setpoint hysteresis bands
independently to fine tune dosing processes
with the ON/OFF controllers. Similarly, the
proportional band and time period are userprogrammable
to save on slow reacting chemicals
which are commonly overdosed.
All models offer an adjustable timer from 10
minutes to 7 days as the maximum time that
the relay contacts may remain closed, an
important feature in case of sudden chemical
depletion, truncated intake or discharge tubing
and other calamities. With these silicon
guardians, users can rest assured that processes
are operating efficiently and safely.
Fail-Safe Protection The Fail-Safe alarms protect processes against
critical errors arising from power interruptions,
surges and human errors. The sophisticated yet
easy-to-use system resolves these problems on
two fronts: hardware and software. To eliminate
blackout and line failure problems, the alarm
function operates in a “Normally Closed” state
and goes off if the wires are accidentally
tripped, or when the power is down. This is an
important feature since with many meters the
alarm terminals close in abnormal situations,
but no alarm is sounded with a line interruption,
causing extensive damage. With our controllers,
software is employed to set off the alarm in
abnormal circumstances. For example, if the
dosing terminals are closed too long (as with
line interruption), red LED’s will also provide a
visual warning signal.
Control through Analog Output
The HI 21 and HI 22 series include models that
provide control through analog output. Now any
compatible device such as electrovalves or pumps
may be driven with these advanced controllers.
Differential Input
All Hanna controllers in this family now come
with a differential input to prevent problems
due to ground loop current. With this new feature,
the life of the electrodes will be greatly extended.
PID Control
HI 21 and HI 22 can be configured with P, PI
or PID controlling. This feature allows the user
to set the controller according to the needs
of the application, ensuring the best system
performance in terms of steady state error and
response time to changes.
Password Protection
Hanna’s password protection feature keeps
these controllers safe from tampering. Only
users with the proper password can change
the settings of these hi-tech controllers. |
- Computer compatibility
- Alarm relay
- ON/OFF, proportional & PID control
- Automatic Temperature Compensation
- Rugged, fiber-reinforced, ABS housing.
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| HI 21 controllers are simple-to-operate, microprocessor-based process meters packed with features.
For more flexibility and better resolution for chart recorders, any two points between 0 and 14 pH
can be chosen to correspond to the analog output spans. Some HI 21 models are equipped with a
bi-directional RS485 port. Push-button password programming prevents tampering. The microprocessor
memory is fully programmable and has 3 months backup power supply. The Fail-Safe
Alarm system protects the HI 21 against the pitfalls of process control, like power interruption or
line failure. With HI 21 quick 1, 2 or 3 point calibration at pH 4.01, 7.01 and 10.01 comes standard.
The temperature can be manually or automatically compensated for. Models with RS485 output
allow computer compatibility, a necessity for process control instrumentation. You can also choose
from ON/OFF, Proportional and PID control to save on chemicals. |
| Specifications |
 |
| HI 22 controllers have been engineered with the same outstanding features as the HI 21 meters.
The microprocessor memory is fully programmable and has a 3-month backup power supply. The
Fail-Safe Alarm system protects these meters against the pitfalls of process control. User-selectable
timing capability safeguards against overdosing and saves money while protecting the environment.
These instruments have a differential input, extending electrode life by eliminating ground loop
current through the reference. Users can choose between ON/OFF and Proportional control as well
as selectable current and voltage outputs. For more flexibility and better resolution for chart
recorders, choose any two points between 0 and 2000 mV to correspond to the analog output
spans. An RS485 port makes one model PC compatible. Wiring the controllers is simple with
extractable terminal modules. A host of self-testing features and user-friendly functions make
HI 22 a great value. |
| Specifications |
 |
| HI 23 is a new series of wall-mounted, microprocessor conductivity controllers. Thanks to the 4-ring EC probe and automatic temperature compensation feature, these meters can provide very accurate measurements.
You can choose among models featuring ON/OFF or PID control, analog input and output, double set point. The relay contacts can drive external devices as, for example, pumps or electro-valves.
The input signal can come from a probe or a 4-20 mA transmitter.
Models with RS485 output are also available. This option allows the user to insert the controller into a 2-wire RS485 network. |
| Specifications |
 |
| Cat. No. |
Description |
| HI 21111 |
pH Controller with single setpoint, ON/OFF
control and analog output. |
| HI 21211 |
pH Controller with dual setpoint, ON/OFF control
and analog output |
| HI 21221 |
pH Controller with dual setpoint, proportional
and ON/OFF control with analog output. |
| HI 21222 |
pH Controller with dual setpoint, proportional
and ON/OFF control with RS485 output. |
| HI 21523 |
pH Controller with single setpoint, control
through analog output, PID and ON/OFF control with analog
and RS485 output. |
| HI 22111 |
ORP Controller with single setpoint, ON/OFF
control and analog output. |
| HI 22122 |
ORP Controller with single setpoint, proportional
and ON/OFF control and RS485 output. |
| HI 23211 |
EC controller with dual setpoint, ON/OFF
control and analog output |
| HI 23212 |
EC controller with dual setpoint, ON/OFF
control and RS 485 port |
| HI 23221 |
EC controller with dual setpoint, ON/OFF
and PID control, and analog output |
| HI 23222 |
EC controller with dual setpoint, ON/OFF
and PID control, and RS 485 port |