Hanna Instruments HI 99121 Manual de usuario

INSTRUCTION MANUAL

HI99121

Waterproof pH & Temperature Meter

for Direct Measurement in Soil

Thank you for choosing a Hanna Instruments product.

Please read this instruction manual carefully before using this meter.

This manual will provide you with the necessary information for correct use of

this meter, as well as a precise idea of its versatility.

If you need additional technical information, do not hesitate to e‑mail us at

[email protected] or view our worldwide contact list at www.hannainst.com.

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the

Dear

Customer,

Preliminary examination .....................................................................................................

General description and Intended use ..................................................................................

Main features.....................................................................................................................

Specifications.....................................................................................................................

Display description .............................................................................................................

Operational guide...............................................................................................................

Meter setup........................................................................................................................

Soil pH..............................................................................................................................

Organic substrate ...............................................................................................................

Irrigation water ..................................................................................................................

Nutrient solution ................................................................................................................

Battery replacement............................................................................................................

Accessories.........................................................................................................................

Electrode maintenance........................................................................................................

Certification........................................................................................................................

Recommendations for users.................................................................................................

Warranty ...........................................................................................................................

TABLE OF CONTENTS

PRELIMINARY EXAMINATION

GENERAL DESCRIPTION AND INTENDED USE

PRELIMINARY EXAMINATION

Remove the instrument and accessories from the packaging and examine it carefully to make sure

that no damage has occurred during shipping. Notify your nearest Hanna Instruments Customer

Service Center if damage is observed.

Each HI99121 is delivered in a rugged carrying case and is supplied with:

• HI12923 pH/temperature probe with conical tip, DIN connector and 1 m (3.3’) cable

• HI70004 pH 4.01 buffer (1 sachet)

• HI70007 pH 7.01 buffer (1 sachet)

• HI700663 cleaning solution for soil deposits (1 sachet)

• HI700664 cleaning solution for humus deposits (1 sachet)

• HI7051M soil sample preparation solution

• HI721319 auger for ground penetration, packed separately in a carton box

• 100 mL beaker (1 pc.)

• 1.5V AAA alkaline batteries

• Instrument quality certificate

• Electrode quality certificate

• Instruction manual

Note: Save all packing material until you are sure that the instrument works correctly. Any

damaged or defective item must be returned in its original packing material with the supplied

accessories.

GENERAL DESCRIPTION AND INTENDED USE

The HI99121 portable pH meter together with HI12923 pH electrode is designed to measure pH in

soil or soil slurries.

The HI99121 is a lightweight, portable pH and temperature meter. It features a two button operation

system and is simple to use. It has a waterproof and compact casing, large dual‑line display, and

automatic pH calibration at one or two points.

The HI12923 has a conical rugged tip. It has a built‑in temperature probe for temperature

compensated pH readings and an integrated preamplifier to provide measurements impervious to

noise and electrical interferences.

The HI721319 auger for ground penetration is supplied to loosen the soil prior to any measurements

being taken. The use of the auger is recommended to prevent scratching to the pH glass.

MAIN FEATURES

• Simultaneous pH and temperature measurements on a large dual‑line LCD display

• Automatic pH calibration at one or two points within two memorized buffer sets (standard

or NIST)

• Selectable temperature unit (°C or °F)

• Electrode condition indicator

• mV of pH measurement for electrode check

• HI12923 dedicated pH probe with integrated temperature sensor

• Probe quick connect system

• Battery life indication and low battery detection

• Keystroke confirmation tone

• Auto‑off function

• Waterproof casing IP67

SPECIFICATIONS

Range*

‑2.00 to 16.00 pH / ‑2.0 to 16.0 pH

±825 mV (pH‑mV)

‑5.0 to 105.0 °C/23.0 to 221.0 °F

Resolution

0.01 pH / 0.1 pH

1 mV

0.1 °C/0.1 °F

Accuracy

@ 25 °C / 68 °F

±0.02 pH / ±0.1 pH

±1 mV (pH‑mV)

±0.5 °C up to 60 °C; ±1.0 °C outside

±1.0 °F up to 140 °F; ±2.0 °F outside

Temperature compensation Automatic

‑5.0 to 105.0 °C/23.0 to 221.0 °F

pH calibration Automatic, 1 or 2 point selectable buffer set Standard (4.01, 7.01 10.01)

or NIST (4.01, 6.86, 9.18)

Probe (included) HI12923 preamplified pH and temperature probe with conical tip,

DIN connector and 1 m (3.3’) cable

Battery type/life 1.5V AAA (3 pcs.)

approx. 1400 hours of continuous use

Auto‑off user selectable: after 8 min, 60 min or disabled

Environment 0 to 50 °C (32 to 122 °F)

RH max. 100%

Meter dimensions 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)

Weight (with batteries) 196 g (6.91 oz.)

Case ingress protection rating IP67

* the HI12923 is limited to be used from 0 to 12 pH and from ‑5 to 70 °C temperature (23 to 158 °F).

SPECIFICATIONSDISPLAY DESCRIPTION

DISPLAY DESCRIPTION

1 Automatic Temperature Compensation indicator

2 Stability indicator

3 Battery percentage

4 Electrode condition indicator

5 Low battery indicator

6 Measurement unit

7 Primary LCD

8 Temperature unit

9 Secondary LCD

10 Meter modes indicator

11 pH calibration buffer(s) used

OPERATIONAL GUIDE

Each meter is supplied with batteries. Before using the meter for the first time, open the battery

compartment and insert batteries, observing the polarity (see “Battery Replacement“).

CONNECTING THE ELECTRODE

With the meter turned off, connect the HI12923 probe to the DIN socket on the bottom of the meter

by aligning the pins and pushing in the plug firmly. Remove the protective cap from the probe before

taking any measurements.

TURNING THE METER ON

To turn the meter ON, press the button on the front of the meter. If it does not turn on,

make sure that the batteries are properly installed in their place. The meter is provided

with an active acoustic signal that confirms when a key is pressed. At start‑up the meter displays all

LCD segments for a few seconds, followed by the percentage indication of the remaining battery life,

displaying “WAIT” until electrode check is in process then the meter enters the normal measurement

mode.

Measurement

mode

Battery life

LCD

check up

→ →

→

Electrode

check

Note: The meter detects the presence and the type of the probe at its input.

- If the probe is not connected the message “NO” ”PROBE“ appears alternatively on the

secondary LCD with “---“ blinking on the first LCD line.

- If the probe is not compatible “WRONG” ”PROBE“ message appears alternatively on the

secondary LCD with “---“ blinking on the first LCD line.

- If the readings are out of range, the nearest range limits are displayed blinking (e.g. -2.00 pH

-5.0 °C).

SELECTING MEASUREMENT VALUES

While in measurement mode, press the SET button to select pH or pH‑mV measurement on the first

LCD line.

OPERATIONAL GUIDE

pH MEASUREMENT & CALIBRATION

Make sure the meter has been calibrated before use. If the probe is dry, soak it in HI70300 storage

solution for 30 minutes to reactivate it. If soiled, clean the electrode by soaking in cleaning solution

for 20 minutes, then rinse the tip and soak in storage solution at least 30 minutes before use.

Rinse the electrode off well and shake off excess droplets. Recalibrate before using. Submerge the

probe in the sample to be tested while stirring it gently. Wait until the tag on the LCD disappears.

The LCD displays the pH value (automatically compensated for temperature)

on the primary LCD, while the secondary LCD displays the sample temperature.

If measurements are taken in different samples successively, rinse the probe

tip thoroughly in distilled or deionized water to eliminate cross‑contamination.

For better accuracy, frequent calibration of the pH sensor with the meter is recommended. In

addition, the meter must be recalibrated:

a) whenever the pH electrode is replaced.

b) after testing aggressive chemicals.

c) when high accuracy is required.

d) at least once a month.

e) after cleaning the sensor.

FREEZING MEASUREMENT VALUES

While in measurement mode, press and hold the SET button until “HOLD“ appears on the secondary

LCD. The “HOLD“ remains for 1 second and reading of pH, mV and temperature will be frozen on

the LCD with “H” blinking.

→

Press any button to resume active measurements.

ENTERING CALIBRATION MODE

Press and hold the button until ”POWER” and tag is replaced by “STD“ and tag.

Release the button.

ENTERING SETUP MODE

Press and hold button until “STD“ and tag is replaced by “SETUP“ and tag.

Release the button.

TURNING THE METER OFF

While in measurement mode, press the button.”POWER” and tag will appear. Release

the button.

OPERATIONAL GUIDE

pH calibration

Enter calibration mode while in pH measurement mode. Place the sensor into the

first calibration buffer. If performing a two‑point calibration, use pH 7.01 (pH

6.86 for NIST) buffer first. The meter will enter the calibration mode, displaying

“pH 7.01 USE” and tag blinking (or “pH 6.86 USE” for NIST).

Follow directions for single and two‑point calibration below:

Single-point calibration

1. Place the probe in any buffer from the selected buffer set. The meter will automatically recognize

the buffer value.

2. If the buffer is not recognized or the calibration offset is out of the accepted range “---- WRONG“

is displayed.

3. If the buffer is recognized “REC“ is displayed then “WAIT“ until the calibration is accepted.

If using pH 7.01 (or pH 6.86 for NIST), after acceptance of the buffer press any key to exit. The

”SAVE” message is displayed and the meter returns to pH measurement mode.

If using pH 4.01 or 10.01 (or pH 9.18 for NIST) buffer the ”SAVE” message is displayed and

meter returns to pH measurement mode.

Two-point calibration

Proceed with steps 1 through 3 under single‑point calibration using 7.01 pH (pH 6.86 for NIST)

buffer first. Then follow steps below:

The ”pH 4.01 USE” message is then displayed.

Place the probe in the second calibration buffer (pH 4.01 or 10.01, or, if using NIST, pH 4.01

or 9.18). When the second buffer is accepted, the LCD will display “SAVE” for 1 second and the

meter will return to the normal measurement mode.

If the buffer is not recognized or the slope is out of accepted range ”--- WRONG” is displayed.

Change the buffer, clean the electrode or press any key to exit calibration.

For better accuracy it is always recommended to carry out a two‑point calibration.

After the calibration procedure has been completed, the tag is turned on together with the

calibrated points.

Exiting calibration and resetting default values

After entering the calibration mode and before the first point is accepted, it is possible to quit the

procedure and return to the last calibration data by pressing the button. The LCD displays “ESC“

for 1 second and the meter returns to normal mode.

To reset the default values and clear a previous calibration, press the SET button after entering the

calibration mode and before the first point is accepted.

The LCD displays “CLEAR“ for 1 second, the meter resets to the default calibration and the

tag with the calibrated points on the LCD disappears.

OPERATIONAL GUIDE

ELECTRODE CONDITION

The display is provided with a probe icon (unless the feature is disabled from setup) which indicates

the electrode status after calibration. The “condition” remains active for 12 hours (unless the

batteries are removed).

The electrode condition is evaluated only if the current calibration has two points.

5 bars: excellent condition

4 bars: very good condition

3 bars: good condition

2 bars: fair condition

1 bar: poor condition

1 bar blinking: very poor condition

With 1 bar it is recommended to clean the electrode and recalibrate. If there is still only 1 bar or

1 bar blinking replace the probe.

Sensor check

Setting the meter to pH‑mV range the user can check the sensor status at any time. The offset

value is the reading in pH 7.01 buffer (@ 25 °C/77 °F). If this reading is outside the range

±30 mV, the electrode is considered “very poor”. The slope value of the sensor is the difference

between readings in pH 7.01 and in pH 4.01 buffers. When the slope reaches the value of about

150 mV, the electrode is considered “very poor“. When “poor“ or “very poor“, it is recommended

to replace it with a new one.

Note: To ensure reliable readings, the electrode must be cleaned with cleaning solution and

then hydrated in storage solution for a minimum of 30 minutes before calibrating the probe.

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