Hanna Instruments HI 98311 User manual

www.hannainst.com
WARRANTY
HI 98311 and HI 98312 are warranted for one
year against defects in workmanship and materials
when used for their intended purpose and maintained
according to instructions. The probe is 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 maintenance 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 re-
turned 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.
InstructionManual
HI 98311 • HI 98312
Waterproof
EC/TDS/Temperature Testers
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.
Each meter is supplied with:
• HI 73311 EC/TDS probe
• HI 73128 probe removal tool
• batteries (4 x 1.5V) and instructions
Note: Conserve all packing material until the instru-
ment has been observed to function correctly.
Any defective item must be returned in its
original packing.
PRELIMINARY EXAMINATION
HI 98311 and HI 98312 are waterproof EC/TDS and
temperature meters. The housing has been completely
sealed against humidity and designed to float.
All EC/TDS readings are automatically temperature
compensated (ATC), and temperature values can be
displayed in °C or °F units.
The EC/TDS conversion factor (CONV) is selectable by
the user, as well as the temperature compensation
coefficient β(BETA).
The meters can be calibrated at one point.
Measurements are highly accurate with a unique
stability indicator right on the LCD.
A low battery symbol warns the user when the batter-
ies are to be replaced. In addition the Battery Error
Prevention System (BEPS) avoids erroneous reading
caused by low voltage level by turning the meter off.
The HI 73311 EC/TDS probe, supplied with the
meter, is interchangeable and can be easily replaced
by the user.
The stainless steel encapsulated temperature sensor
facilitates faster and more accurate temperature mea-
surement and compensation.
GENERAL DESCRIPTION
FUNCTIONAL DESCRIPTION
Recommendations for Users
Before using this product, make sure that it is entirely suit-
able for the environment in which it is used. Operation of
this instrument in residential areas could cause unaccept-
able interferences to radio and TV equipment.
Avoid touching the probes at all times.
Any variation introduced by the user to the supplied equip-
ment may degrade the instrument’s EMC performance. To
avoid electrical shock, do not use this instrument when volt-
ages at the measurement surface exceed 24 Vac or 60 Vdc.
To avoid damages or burns, do not perform any measure-
ment in microwave ovens.
IST98311R3 07/05
US DESIGN PATENT
D462,024
1. Battery compartment
2. Liquid Crystal Display (LCD)
3. ON/OFF/MODE button
4. HI 73311 EC/TDS probe
5. Temperature sensor
6. SET/HOLD button
1. Automatic temperature compensation indicator
2. Stability indicator
3. Battery life percentage indicator
4. Low battery indicator
5. Secondary display
6. Primary display
7. Measuring units for primary display
SPECIFICATIONS
Range
Resolution
Accuracy
(@20°C/68°F)
Typical EMC
Deviation
Temperature
Compensation
Environment
TDS Factor
Calibration
Cal.Solutions
HI 98311:
HI 98312:
Probe (included)
Battery Type/Life
Auto-off
Dimensions
Weight
0.0 to 60.0°C / 32.0 to 140.0°F
0 to 3999 µS/cm (HI 98311)
0.00 to 20.00 mS/cm (HI 98312)
0 to 2000 ppm (HI 98311)
0.00 to 10.00 ppt (HI 98312)
0.1°C / 0.1°F
1 µS/cm ; 1 ppm (HI 98311)
0.01 mS/cm ; 0.01 ppt (HI 98312)
±0.5°C / ±1°F
±2% f.s. (EC/TDS)
±0.5°C / ±1°F
±2% f.s. (EC/TDS)
Automatic, with β=0.0 to 2.4%/ºC
0 to 50°C (32 to 122°F); RH 100%
0.45 to 1.00 (CONV)
Automatic, 1 point
HI7031 (1413 µS/cm)
HI7032 (1382 ppm; CONV=0.5)
HI70442 (1500 ppm; CONV=0.7)
HI7030 (12.88 mS/cm)
HI70038 (6.44 ppt; CONV=0.5
or 9.02 ppt; CONV=0.7)
HI 73311 EC/TDS probe
4 x 1.5V with BEPS/approx. 100 hours
After 8 minutes of non-use
163 x 40 x 26 mm (6.4 x 1.6 x 1.0”)
100 g (3.5 oz.)
Hanna Instruments reserves the right to modify the design, con-
struction and appearance of its products without advance notice.
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 [email protected].
These instruments are in compliance with the
directives.

For better accuracy, frequent calibration of the instru-
ment is recommended. In addition, the instrument
must be recalibrated whenever:
a) The EC/TDS probe is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.
To change the EC/TDS coversion factor
(CONV) and the temperature compensa-
tion coefficient ββ
ββ
β(BETA)
• From measurement mode, press and hold the /
MODE button until TEMP and the current tempera-
ture unit are displayed on the lower LCD (E.g.
TEMP °C).
• Press the /MODE button again to show the
current conversion factor (E.g. 0.50 CONV).
• Press the SET/HOLD button to change the conver-
sion factor.
• Press the /MODE button to show the current
temperature compensation coefficient β(E.g. 2.1
BETA).
• Press the SET/HOLD button to change the the
temperature compensation coefficient β.
• Press the /MODE button to return to the normal
measuring mode.
Calibration procedure
• From measurement mode, press and hold the /
MODE button until CAL is displayed on the lower
LCD.
• Release the button and immerse the probe in the
proper calibration solution: HI 7031 (1413 µS/cm)
for HI 98311 and HI 7030 (12.88 mS/cm) for HI
98312.
• Once the calibration has been automatically per-
formed, the LCD will display OK for 1 second and
the meter will return to normal measurement mode.
• Since there is a known relathionship between EC
and TDS readings, it is not necessary to calibrate
the meter in TDS. If the EC/TDS conversion factor is
either 0.5 or 0.7, the meter will allow a direct
calibration in ppm by using the Hanna calibration
solutions listed below.
The CAL symbol on the LCD means that the meter is
calibrated.
To reset to the default calibration
To clear a previous calibration, press the MODE
button after entering the calibration mode. The lower
LCD will display ESC for 1 second and the meter will
return to normal measurement mode. The CAL symbol
on the LCD will disappear. The meter will be reset to
the default calibration.
CALIBRATION BATTERY REPLACEMENTPROBE MAINTENANCE
The EC/TDS probe can be easily replaced by using the
supplied tool (HI 73128). Insert the tool into the probe
cavity as shown below.
Rotate the probe counterclockwise.
Pull the probe out by using the other side of the tool.
Insert a new probe following the above instructions in
reverse order.
To turn the meter on and to check battery status
Press and hold the /MODE button for 2-3 sec-
onds. All the used segments on the LCD will be visible
for a few seconds, followed by a percent indication of
the remaining battery life (E.g. % 100 BATT).
Taking measurements
Submerge the probe in the solution to be tested. Use
plastic beakers to minimize any electromagnetic inter-
ferences.
Select either EC or TDS mode with the SET/HOLD
button.
The measurements should be taken when the stability
symbol on the top left of the LCD disappears.
The EC (or TDS) value automati-
cally compensated for temperature
is shown on the primary LCD
while the secondary LCD shows
the temperature of the sample.
To change the temperature unit
To change the temperature unit (from °C to °F), from
measurement mode, press and hold the /MODE
button until TEMP and the current temperature unit
are displayed on the lower portion of the LCD (E.g.
TEMP °C).
Use the SET/HOLD button to change the temperature
unit, and then press the /MODE button twice to
return to the normal measuring mode.
To freeze the display
Press the SET/HOLD button for
2-3 seconds until HOLD appears
on the secondary display.
Press either button to return to
the normal measuring mode.
To turn the meter off
Press the /MODE button while in normal measur-
ing mode. OFF will appear on the lower part of the
display. Release the button.
Notes:
• Before taking any measurement make sure the
meter has been calibrated.
• If measurements are taken in different samples
successively, rinse the probe thoroughly to eliminate
cross-contamination; and after cleaning, rinse the
probe with some of the sample to be measured.
OPERATIONAL GUIDE
ACCESSORIES
HI 73311 Replaceable EC/TDS probe
HI 73128 Probe removal tool
HI 70030P 12.88 mS/cm solution, 20 mL sa-
chet (25 pcs)
HI 70031P 1413 µS/cm solution, 20 mL sa-
chet (25 pcs)
HI 70032P 1382 ppm solution, 20 mL sachet
(25 pcs)
HI 70038P 6.44 ppt solution, 20 mL sachet
(25 pcs)
HI 70442P 1500 ppm solution, 20 mL sachet
(25 pcs)
The meter displays the remaining battery percentage
every time it is switched on. When the battery level is
below 5%, the

symbol on the bottom left of the LCD
lights up to indicate a low battery condition. The batter-
ies should be replaced soon. If the battery level is low
enough to cause erroneous readings, the meter shows
“0%” and the Battery Error Prevention System (BEPS) will
automatically turn the meter off.
To change the batteries, remove the 4 screws located on
the top of the meter.
Once the top has been removed, carefully replace the 4
batteries located in the compartment while paying atten-
tion to their polarity.
Replace the top, making sure that the gasket is properly
seated in place, and tighten the screws to ensure a
watertight seal.