Hanna Instruments HI 991404 User Manual

Instruction Manual

(HI 991404 - HI 991405)

These Instruments are in

www.hannainst.com

Compliance with CE

Directives

WARRANTY

HI 991404 and HI 991405 are warranted for two years against
defects in workmanship and materials when used for their intended pur­pose and maintained according to instructions. The 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, Hanna Instruments
Inc., Woonsocket, Rhode Island, 02895 , USA.

Hanna Instruments reserves the right to modify the design, construction 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 [e-mail].

These instruments are in compliance with the directives.

PRELIMINARY EXAMINATION

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 meters are supplied with:

• pH 4.01 and 7.01 buffer solutions (20 mL each);

• HI 70031 1413 µS/cm calibration solution, for HI 991404;

• HI 70030 12.88 mS/cm calibration solution, for HI 991405;

• 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.

GENERAL DESCRIPTION

COMBO is a combined pH/temperature/EC/TDS
meter specially 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 EC/TDS/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 for pH and at single point for EC/TDS.

You no longer need to worry about battery changes either:
the unit runs without interruption on 12 VDC power supply.

FUNCTIONAL DESCRIPTION

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. EC/TDS/Temperature probe, pipe thread 1/2’’ NPT
(works also as matching pin for pH-electrode)

7. DIN connector

8. SET/HOLD button

SPECIFICATIONS

HI 991404

EC/TDS Range 0 to 3999 µS/cm - 0 to 2000 ppm
Resolution 1 µS/cm - 1 ppm
Accuracy (@20ºC/68ºF) ±2% f.s.
Typical EMC Deviation ±2.5 f.s.

HI 991405

EC/TDS Range 0.00 to 20.00 mS/cm - 0.00 to 10.00 ppt
Resolution 0.01 mS/cm - 0.01 ppt
Accuracy (@20ºC/68ºF) ±2% f.s.
Typical EMC deviation ±2.5% f.s.

Common specifications

pH Range 0.0 to 14.0 pH
Temperature Range 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

±1 ºC or ±2 ºF

Temp.Compensation pH Automatic
EC/TDS β=0.0 to 2.4%/ºC
TDS Conversion factor 0.45 to 1.00 (CONV)
pH electrode HI 1293D (included)
pH Calibration At 1 or 2 points with auto-buffer recognition
EC/TDS Calibration Automatic at 1 point
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.)

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 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.

ISTR991404R1 05/02

OPERATIONAL GUIDE

To turn the meter on

Connect the pH electrode to the meter.
Connect the 12VDC adapter to the meter and to the mains;

the display will lit. Press and hold the MODE button for 2­3 seconds. All the used segments on the LCD will be visible
for a few seconds.

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 LCD. Eg. TEMP °C.
Use the SET/HOLD button to change the temperature unit,

and then press MODE button twice to return to normal
measurement mode.

To freeze the display

Press and hold the SET/HOLD button for 2-3 seconds until

HOLD appears on the secondary display.

Press either button to return to normal mode.

Taking measurements

Select the pH, EC or TDS mode with the SET/HOLD button.

Immerse the probes in the solution to
be tested. In order to ensure better
accuracy, probes should not touch or
stand close to the walls or bottom of
the sample vessel.

The pH, EC or TDS value automati­cally compensated for temperature is
shown on the primary LCD while the
secondary LCD shows the temperature
of the sample.

The measurements should be taken when the stability
symbol  on the top left of the LCD disappears.

Note:

Measurements have to be taken with both probes (pH­electrode and EC/TDS/temperature probe) immersed in the
same vessel.

To change the EC/TDS conversion factor (CONV)
and the temperature compensation coefficient
(BETA)

• From measurement mode, press and hold the MODE
button until TEMP and the current temperature unit are
displayed on the lower LCD. Eg. TEMP °C.

• Press the MODE button again to show the current
conversion factor. Eg. 0.50 CONV.

• Press the SET/HOLD button to change the conversion
factor.

• Press the MODE button to show the current temperature
compensation coefficient β. Eg. 2.1 BETA.

• Press the SET/HOLD button to change the temperature
compensation coefficient β.

• Press the MODE button to return to normal measuring
mode.

To turn the meter off
Press the MODE button while in normal measurement mode.

OFF will appear on the lower part of the display. Release

the button. The display still lits, until the power supply is
connected.

Notes:

• Before taking any measurement make sure the meter
has been calibrated.

• 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.

• If measurements are taken in different samples succes­sively, rinse the probes thoroughly to eliminate
cross-contamination; and after cleaning, rinse the probes
with some of the sample to be measured.

CALIBRATION

pH calibration buffer set

• From pH measurement mode, press and hold the MODE
button until TEMP and the current temperature unit are
displayed on the lower LCD. Eg. TEMP °C.

• Press the MODE button again to show the current buffer
set: pH 7.01 BUFF (for 4.01/7.01/10.01 calibration) or

pH 6.86 BUFF (for NIST 4.01/6.86/9.18 calibration).

• Press the SET/HOLD button to change the buffer value.

• Press the MODE button to return to normal measuring
mode.

• Since there is a known relationship between EC and TDS

ββ

β

ββ

pH calibration procedure

readings, it is not necessary to calibrate the meter in TDS

From pH measurement mode, press and hold the MODE
button until CAL is displayed on the lower LCD. Release the
button. The LCD will display pH 7.01 USE (or pH 6.86

USE if you have selected the NIST buffer set). The CAL tag

Note: for storing calibration data in the non-volatile memory,
turn the meter OFF and then ON again through the MODE
button.

blinks on the LCD.

The CAL symbol on the LCD means that the meter is

• For a single-point pH calibration, place the electrode and

calibrated.

the probe in any buffer from the selected buffer set (eg. pH

7.01 or pH 4.01 or pH 10.01). The meter will recognize the
buffer value automatically.

If using pH 4.01 or pH 10.01, the meter will display OK for
1 second and then return to measurement mode.

If using pH 7.01, after recognition of the buffer the meter
will ask for pH 4.01 as second calibration point. Press the
MODE button to return to measurement mode or, if desired,
proceed with the 2-point calibration as explained below.

pH ELECTRODE MAINTENANCE

• When not in use, rinse the electrode with water to
minimize contamination and store it with a few drops of
storage (HI 70300) or pH 7 (HI 7007) solution in the
protective cap after use. DO NOT USE DISTILLED OR DEION­IZED WATER FOR STORAGE PURPOSES.

Note: for better accuracy it is always recommended to carry
out a two-point calibration.

• If the electrode has been left dry, soak in a storage or pH
7 solution for at least one hour to reactivate it.

• To prolong the life of the pH electrode, it is recommended

• For a two-point pH calibration, place the electrode and
the probe in pH 7.01 (or 6.86 if you have selected the NIST
buffer set). The meter will recognize the buffer value and

to clean it monthly by immersing it in the HI 7061 cleaning
solution for half an hour. Afterwards, rinse it thoroughly
with tap water and recalibrate the meter.

then display pH 4.01 USE.
Rinse the electrode thoroughly to eliminate cross-contamina-

tion.
Place the electrode in the second buffer value (pH 4.01 or

10.01, or, if using NIST, pH 4.01 or 9.18). When the
second buffer is recognized, the LCD will display OK for 1
second and the meter will return to normal measurement
mode.

Note: for storing calibration data in the non-volatile memory,
turn the meter OFF and then ON again through the MODE
button.

The CAL symbol on the LCD means that the meter is
calibrated.

EC calibration procedure

• From EC 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 70031 (1413 µS/cm) for HI 991404
and HI 70030 (12.88 mS/cm) for HI 991405.

• Once the calibration has been automatically performed,
the LCD will display OK for 1 second and the meter will
return to normal measurement mode.

HI 1293D Replaceable pH electrode with differential input & DIN
HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70006P pH 6.86 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70009P pH 9.18 solution, 20 mL sachet (25 pcs)
HI 70010P pH 10.01 solution, 20 mL sachet (25 pcs)
HI 77400P pH 4 & 7 solutions, 20 mL sachet (5 each)
HI 7004M pH 4.01 solution, 230 mL bottle
HI 7006M pH 6.86 solution, 230 mL bottle
HI 7007M pH 7.01 solution, 230 mL bottle
HI 7009M pH 9.18 solution, 230 mL bottle
HI 7010M pH 10.01 solution, 230 mL bottle
HI 70030P 12.88 mS/cm @25ºC cal. solution, 20 mL sachet (25 pcs)
HI 70031P 1413 µS/cm @25ºC cal. solution, 20 mL sachet (25 pcs)
HI 70032P 1382 ppm @25ºC cal. solution, 20 mL sachet (25 pcs)
HI 70038P 6.44 ppt @25ºC cal. solution, 20 mL sachet (25 pcs)
HI 70442P 1500 ppm @25ºC cal. solution, 20 mL sachet (25 pcs)
HI 7061M Electrode cleaning solution, 230 mL bottle
HI 70300M Electrode storage solution, 230 mL bottle
HI 710005 12VDC power adapter, US plug
HI 710006 12VDC power adapter, European plug
HI 710012 12VDC power adapter, Australian plug
HI 710013 12VDC power adapter, Southern Africa plug
HI 710014 12VDC power adapter, UK plug

ACCESSORIES

ACCESSORIES