3
2
pH 20
and
pH 21
are basic pH meters designed for simplicity of use in
all applications where rapid daily controls are required.
These meters are also suitable for educational field, where students begin
to approach pH measurements.
Both models measure pH in the 0 to 14 range, with 0.01 resolution.
In addition,
pH 21
can also measure ORP (mV) by using a proper ORP
electrode (optional).
The pH calibration procedure is automatic and can be performed at
1 or 2 points.
Readings can be manually (MTC) or automatically (ATC) compensated
for temperature variations.
The automatic temperature compensation is performed if using the
optional
HI 7662
temperature probe, while for manual compensation
the user can set the temperature value through the arrow keys.
The meters are also provided with the Hold function, which allows to
freeze reading on the LCD by simply pressing the HOLD button.
GENERAL DESCRIPTION
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it to
make sure that no damage has occurred during shipping. If there is
any damage, notify your Dealer.
Each meter is supplied complete with:
•
HI 1110B
pH electrode with BNC connector and 1 m cable
• 12 Vdc adapter
• instruction manual
Note:
Save all packing material until you are sure that the instru-
ment functions correctly. All defective items must be returned in
the original packing with the supplied accessories.
Dear Customer,
Thank you for choosing a Hanna Instruments Product.
Please read this instruction manual carefully before using the instru-
ment. This manual will provide you with all the necessary information
for the correct use of the instrument, as well as a precise idea of its
versatility in a wide range of applications.
If you need additional technical information, do not hesitate to e-mail
us at
These instruments are in compliance with the
directives.
TABLE OF CONTENTS
GENERAL DESCRIPTION ........................................................................... 3
PRELIMINARY EXAMINATION ...................................................................... 3
FUNCTIONAL DESCRIPTION ........................................................................ 4
SPECIFICATIONS ................................................................................... 5
OPERATIONAL GUIDE ................................................................................ 6
pH CALIBRATION ................................................................................... 9
ELECTRODE CONDITIONING AND MAINTENANCE ........................................ 11
ACCESSORIES
................................................................................. 13
Hanna Instruments reserves the right to modify the design, construction and
appearance of its products without advance notice.
WARRANTY
All Hanna Instruments
meters are warranted for two years
against defects in workmanship and materials when used for their
intended purpose and maintained according to instructions.
The
electrodes and the probes are warranted for six months.
This
warranty is limited to repair or replacement free of charge. Damages
due to accident, misuse, tampering or lack of prescribed mainte-
nance are not covered. If service is required, contact the dealer from
whom you purchased the instrument. If under warranty, report the
model number, date of purchase, serial number and the nature of
the failure. If the repair is not covered by the warranty, you will be
notified of the charges incurred. If the instrument is to be returned
to Hanna Instruments, first obtain a Returned Goods Authorization
number from the Customer Service department and then send it
with shipping costs prepaid. When shipping any instrument, make
sure it is properly packaged for complete protection.
