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Instruction Manual
HI 98143
pH & EC Transmitter
with Isolated Output
WARRANTY
These instruments are warranted for two years against defects in
workmanship and materials when used for its 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 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 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.
Dear Customer,
Thank you for choosing a Hanna product.
This manual will provide you with the necessary information
for the correct operation of the meter. 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.
These instruments are 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.
Each instrument is supplied complete with instructions.
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
HI 98143 is a panel mounted pH and EC transmitter specially
designed to accept signals directly from a pH electrode and
conductivity probe at the same time.
Direct connections of the probes to the transmitter assures a
positive electrical connection with no signal loss.
Four models are available, transmitting at 0-1 V, 0-4 V or 420 mA signal. The output signals are prooprtional to the
input signals, but independent of changes in load or cable
capacitance.
Conductivity readings are compensated for temperature changes.
These transmitters can be connected to any pH or conductivity
controller, recorder, computer or any data monitoring device
that accepts 0 to 1 V, 0 to 4 V or 4 to 20 mA input.
The HI 98143-22 model has been specifically designed to be
used with the HI 8000 fertigation controllers.
GENERAL DESCRIPTION
FUNCTIONAL DESCRIPTION
1. pH offset calibration trimmer
2. pH slope calibration trimmer
3. BNC connector for pH electrode
4. pH electrode (not included)
5. Potential matching pin (not included)
6. Conductivity probe (not included)
7. 12-24 Vdc power adapter (not included)
8. pH output terminals
9. EC output terminals
10. Power supply terminals
11. EC slope calibration trimmer
12. EC offset calibration trimmer
SPECIFICATIONS
Range
pH 0 to 14 pH
EC 0 to 10 mS/cm
Accuracy(@ 25°C/77°F)
pH ±0.5% f.s.
EC ±2% f.s.
Typical EMC Deviation
pH ±2% f.s.
EC ±2% f.s
Isolated Output (pH and EC)
HI 98143-01 0-1 V
HI 98143-04 0-4 V
HI 98143-20 4-20 mA (passive)
HI 98143-22 4-20 mA (active)
Calibration Manual, 2 point, through trimmers
pH offset and slope trimmers
EC 0 and 5 mS/cm trimmers
Temperature Compensation (EC only)
Automatic from 0 to 60°C with ß=2%/ºC
pH Electrode HI 1001 pH electrode (suggested) and
HI 1283 matching pin (not included)
EC Probe HI 3001(not included) with cell constant 2.1
Casing IP54
Power Supply 12-24 Vdc
Environment 0 to 50°C (32 to 122°F); RH max 95%
Dimensions 160 x 105 x 31mm (6.3 x 4.1 x 1.2”)
Weight 280 g (9.9 oz.)
HI 98143-01
HI 98143-04
HI 98143-20
HI 98143-22
0 to 14 pH = 0 to 1 Vdc
0 to 10 mS = 0 to 1 Vdc
0 to 14 pH = 0 to 4 Vdc
0 to 10 mS = 0 to 4 Vdc
0 to 14 pH = 4 to 20 mA
0 to 10 mS = 4 to 20 mA
0 to 14 pH = 4 to 20 mA
0 to 10 mS = 4 to 20 mA
www.hannainst.com
Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.
ACCESSORIES
HI 1001 “flow-thru”, double junction pH electrode with
BNC connector and 3 m (10’)
HI 1283 Stainless steel grounding probe with 2 m
(6.6’) cable
HI 3001 “flow-thru”, 4 platinum ring EC probe with
built-in temperature sensor & 3 m (10’) cable
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 7039L 5.00 mS/cm calibration solution, 500 mL bottle
HI 70300L Electrode storage solution, 500 mL bottle
HI 7061L Electrode cleaning solution, 500 mL bottle
HI 710005 115 Vac to 12 Vdc power adapter
HI 710006 230 Vac to 12 Vdc power adapter
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 residential
areas could cause unacceptable interferences to radio and TV equipment.
The glass bulb at the end of the electrode is sensitive to electrostatic
discharges. Avoid touching this glass bulb all the time. The metal band at
the end of the EC probe is sensitive to electrostatic discharges. Avoid
touching this metal band all the time. 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.
IST98143 07/05
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CALIBRATION
For better accuracy, frequent calibration of the instrument is recommended.
Calibration should also be performed whenever the pH electrode is replaced, after testing aggressive chemicals or at least once a month.
pH CALIBRATION
Pour small quantities of pH 7.0 (HI 7007) and pH 4.0 (HI 7004) or
pH 10.0 (HI 7010) solutions into two clean beakers. Use pH 4.0 solution as second calibration buffer if you are measuring acidic samples,
while pH 10.0 solution is recommended for alkaline solutions.
• Connect a multimeter to the pH output terminals and set it to voltage
(HI 98143-01 and HI 98143-04) or current (HI 98143-20 and
HI 98143-22) readings.
• Turn the transmitter on. Rinse and immerse pH electrode and matching pin (if used) in pH 7.0 buffer.
Stir gently and wait for the reading to stabilize.
• Adjust the pH offset calibration trimmer with a small
screwdriver until the multimeter displays:
500 mV for HI 98143-01
2.00 V for HI 98143-04
12.00 mA for HI 98143-20 and HI 98143-22.
• Rinse and immerse pH electrode and matching pin (if used) in
pH 4.0 (or pH 10.0) buffer and stir gently.
• Wait a couple of minutes and then adjust the pH slope trimmer until
the multimeter shows the value of the second buffer:
model pH 4 buffer pH 10 buffer
HI 98143-01 286 mV 714 mV
HI 98143-04 1.14 V 2.86 V
HI 98143-20 8.57 mA 15.43 mA
HI 98143-22 8.57 mA 15.43 mA
The pH calibration is now complete.
EC CALIBRATION
• Connect a multimeter to the EC output terminals and set it to voltage
(HI 98143-01 and HI 98143-04) or current (HI 98143-20 and
HI 98143-22) readings.
• Turn the transmitter on.
• Leave the HI 3001 EC probe in air (dry probe), and adjust the EC
offset calibration trimmer with the calibration screwdriver until the
multimeter displays:
0 mV for HI 98143-01 and HI 98143-04
4.00 mA for HI 98143-20 and HI 98143-22.
• Pour a small quantity of 5.00 mS/cm (HI 7039) calibration solution in a plastic beaker and immerse completely the tip of the EC
probe into the solution.
• Tap the probe repeatedly on the bottom of the beaker and stir it to
ensure that
no air bubbles are trapped inside the sleeve. In the case
of in-line applications, to better simulate the installation ambient,
the probe tip should be close to the beaker bottom edge.
• Allow the reading to stabilize and adjust the EC slope calibration
trimmer to read on the multimeter:
500 mV for HI 98143-01
2.00 V for HI 98143-04
12.00 mA for HI 98143-20 and HI 98143-22.
The EC calibration is now complete.
CONNECTIONS
pH ELECTRODE CONNECTION
• Connect the pH electrode to the BNC connector (#3) and
the Matching pin to the PM terminal.
EC PROBE CONNECTION
• Probe wires are colour coded for an easy installation:
Terminal Probe Wire Color
EC probe #1 Green
EC probe #2 White
EC probe #3 Red
EC probe #4 Blue
Temperature sensor #1 Brown
Temperature sensor #2 Grey
Shield Yellow-green
POWER CONNECTION
• Connect a 2-wire cable to the 12-24 Vdc power source,
while paying careful attention to its polarity.
OUTPUT CONNECTION
• Connect a 2-wire cable from the pH output terminals
(#8) to the pH receiver, and another 2-wire cable from
the EC output terminals to the EC receiver, while paying
attention to the polarity. Outputs vary proportionally to
the measured pH and EC values in the range of 0-1 V (for
HI 98143-01), 0-4 V (for HI 98143-04) or 4-20 mA (for
HI 98143-20 and HI 98143-22).
OPERATIONAL GUIDE
• HI 98143 may be wall-mounted at any convenient
location close to the measurement site. To minimize thermal drifts due to extreme temperature fluctuations, it is
recommended to protect transmitter inside a casing.
• Connect probes, power supply and receiving devices to the
HI 98143 as explained in the previous section.
• Remove the protective cap from the pH electrode and
immerse it at least 4 cm into the sample.
• If the matching pin is used, dip it together with
the pH electrode; if it is not used, connect the
matching pin terminal to the reference with a
jumper wire.
• Immerse the EC probe in the sample.
Reference
Matching Pin
• For continuous flow-thru measurements, the probes can be
easily installed in any standard ½” pipe tee. Use Teflon
®
tape between the probe and the pipe to ensure a leak
free joint. Take care not to overtighten it, as excessive
pressures can cause probe damage.
Note: To prevent any damage, disconnect the pH electrode
before turning the meter off.
OUTPUT
HI 98143-01 and HI 98143-04:
The input is isolated from output and
power supply. The outputs aren’t isolated
from power supply.
HI 98143-20:
The output must be feed by an external power supply, which
can be the same used for the meter. Carefully follow the first
connection diagram.
If an additional power supply is used to feed the inputs,
follow the second connection schema. Note that the negative
sockets are connected with the negative power supply.
HI 98143-22:
Carefully follow this connection
diagram for active current output calibration.
pH ELECTRODE MAINTENANCE
• Do not be alarmed if white crystals appear around the electrode
protective cap. This is normal with pH electrodes and they dissolve
when rinsed with water.
• When not in use, rinse the electrode with tap water and store it with a
few drops of storage (HI 70300) or pH 7 (HI 7007) solution in the
protective cap.
NEVER USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES.
• If the electrode has been left dry, soak the tip in a storage (HI 70300)
or pH 7 (HI 7007) solution for at least one hour to reactivate it.
• To minimize clogging and provide longer life for the pH electrode, it
is recommended to clean it monthly. Immerse the tip of the electrode in HI 7061 for one hour and then rinse it with tap water.
EC PROBE MAINTENANCE
• When calibration can no longer be achieved, remove conductivity
probe from the system for maintenance.
• Rinse the probe with tap water. If a more thorough cleaning is desired, remove the plastic protective sleeve and clean the platinum
sensors with a non-abrasive cloth soaked in HI 7061 cleaning solution. Reinsert the sleeve, while paying
attention that the sleeve hole touches the
threaded edge.
PROBE MAINTENANCE
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