Hanna Instruments hi 991401 User Manual

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w w w . h a n n a i n s t . c o m
Hanna Instruments reserves the right to modify the design, construction and
appearance of its products without advance notice.
WARRANTY
HI 991401 is warranted for two years against defects in workman-
ship and materials when used for their intended purpose and maintained
according to instructions. Electrodes and probes are warranted for a
period of 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 shipment costs prepaid. When shipping any instrument, make
sure it is properly packaged for complete protection.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner, Hanna Instruments
Inc., Woonsocket, Rhode Island, 02895 , USA.
Instruction Manual
(HI 991401)
Dear Customer,
Thank you for choosing a Hanna product. This manual will
provide you with the necessary information for a correct
operation. Please read it carefully before using the meter.
If you need additional technical information, do not hesitate
to e-mail us at tech@hannainst.com.
This instrument is in compliance with the      directives.
Remove the instrument from the packing material and
examine it carefully. If any damage has occurred during
shipment, immediately notify your Dealer or the nearest
Hanna Customer Service Center.
The meter is supplied with:
• pH 4.01 and 7.01 buffer solutions (20 mL each);
• HI 1293D pH-electrode with differential input signal;
• Hanna 12 VDC power adapter;
• Instruction manual.
Note: Conserve all packing material until the instrument
has been observed to function correctly. Any defective
item must be returned in its original packing.
PRELIMINARY EXAMINATION
pH 
 
is a combined pH/temperature meter spe-
cially designed to meet the needs of growers in greenhouses
and hydroponic applications.
You can simply install the meter above the sample to be
tested for continuous measurement.
The HI 1293D pH-electrode & the temperature probe have
been molded with pipe thread (1/2’’ NPT), which allows the
user to attach them to an in-line system.
Measurements are accurate and the meter can be calibrated
at one or two points.
You no longer need to worry about battery changes either:
the unit runs without interruption on 12 VDC power supply.
GENERAL DESCRIPTION
FUNCTIONAL DESCRIPTION
This Instrument is in
Compliance with CE
Directives
SPECIFICATIONS
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the
environment in which it is used. Operation of this instrument in residen-
tial areas could cause unacceptable interferences to radio and TV equip-
ment.
The glass bulb at the end of the electrode is sensitive to electrostatic dis-
charges. Avoid touching this glass bulb at all times. During operation, ESD
wrist straps should be worn to avoid possible damage to the electrode by
electrostatic discharges.
Any variation introduced by the user to the supplied equipment may degrade
the instrument’s EMC performance.
To avoid electrical shock, do not use this instrument when voltages at the
measurement surface exceed 24 VAC or 60 VDC. To avoid damages or burns,
do not perform any measurement in microwave ovens.
ISTR991401R1    05/03
Range      pH
0.0 to 14.0 pH
       temperature
0.0 to 60ºC (32.0 to 140ºF)
Resolution
0.1 pH
0.1ºC or 0.1ºF
Accuracy 
(@20ºC/68ºF)
±0.1 pH
±0.5 ºC or ±1ºF
Typical EMC Deviation
±0.1 pH
±1ºC or ±2 ºF
Temp.Compensation
Automatic
Electrode
HI 1293D (included)
Calibration
At 1 or 2 points with auto-buffer recognition
Power supply
   12VDC power adapter (included)
Environment
0 to 50ºC (32 to 122ºF);
RH 95% non-condensing
Dimensions (meter only)
160 x 105 x 31 mm
(6.2 x 4.1 x 1.2’’)
Weight (meter only)
190 g (6.7 oz.)
1. Liquid Crystal Display
2. ON/OFF/MODE button
3. Power supply connector
4. 12 VDC power adapter
5. HI 1293D pH-electrode with differential input, pipe
thread 1/2’’ NPT
6. Temperature probe, pipe thread 1/2’’ NPT
(works also as matching pin for pH-electrode)
7. DIN connector
8. SET/HOLD button