User Guide

All rights are reserved. Reproduction in whole or in part is prohibited without the written

consent of the copyright owner, Hanna Instruments Inc., 584 Park East Drive, Woon-

socket, Rhode Island, 02895, USA.

Dear Customer,

Thank you for choosing a Hanna Product.

This instruction manual refers to the following products:

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

HI 24211 EC and TDS controller with dual setpoint,

ON/OFF control and analog output

HI 24212 EC and TDS controller with dual setpoint,

ON/OFF control and RS 485 output

HI 24221 EC and TDS controller with dual setpoint,

ON/OFF and PID control, and analog out-

put

HI 24222 EC and TDS controller with dual setpoint,

ON/OFF and PID control, and RS 485 port

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.

These instruments are in compliance with the directives.