Hanna Instruments HI 21 Series - Manual (Page 2)

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TABLE OF CONTENTS
PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . 4
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 4
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . 6
MECHANICAL DIMENSIONS . . . . . . . . . . . . . . . . . . 7
SPECIFICATIONS HI 21 & HI 22 . . . . . . . . . . . . . . . 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
© 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 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 HI 21XYZ are pH controllers, while the models
HI 22XYZ are ORP controllers.
HI 21111 pH Controller with single setpoint, ON/OFF
control, analog output
HI 21211 pH Controller with dual setpoint, ON/OFF
control, analog output
HI 21221 pH Controller with dual setpoint, proportional
and ON/OFF controls, analog output
HI 21222 pH Controller with dual setpoint, proportional
and ON/OFF controls, RS485 output
HI 21523 pH Controller with control through analog
output, proportional and ON/OFF controls,
analog and RS485 outputs
HI 22111 ORP Controller with single setpoint, ON/OFF
control, analog output
HI 22122 ORP Controller with single setpoint, propor-
tional and ON/OFF controls, RS485 output