Hanna Instruments HI 981401N User Manual

Instruction Manual

(HI 981401N)

Water-resistant

pH Monitor with Large LCD

www.hannainst.com

WARRANTY

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].

This instrument is 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 meter is supplied with:

• HI 1286 pH electrode

• HI 1283 grounding probe

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

• Calibration screwdriver

• 12 Vdc power adapter and 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.

GENERAL DESCRIPTION

FUNCTIONAL DESCRIPTION

SPECIFICATIONS

Range 0.0 to 14.0 pH
Resolution 0.1 pH
Accuracy (@ 25°C/77°F) ±0.2 pH
Typical EMC Deviation ±0.1 pH
Calibration Manual with two trimmers

for offset and slope

Probes HI 1286 pH electrode (included)

and HI 1283 grounding probe (fixed)

Casing IP54
Power Supply 12 Vdc adapter (included)
Dimensions 86 x 110 x 43 mm (3.4 x 4.3 x 1.7’’)
Weight 150 g (5.3 oz)

OPERATIONAL GUIDE

pH ELECTRODE CONNECTION & MAINTENANCE

In order to protect the meter against
vapors and humidity, the BNC connector
is protected with a waterproof sheath.

HI 981401N is warranted for two years against defects in work­manship and materials when used for their intended purpose and
maintained according to instructions. The electrodes 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 reserves the right to modify the design, construction

and appearance of its products without advance notice.

HI 981401N is a pH meter specially designed to meet the
needs of growers in greenhouses and hydroponic applica­tions. It is equipped with a large LCD for easy-to-read
measurements even from a distance.

The housing has been completely sealed against vapors and
humidity.

The HI 1286 gel-filled pH electrode is interchangeable and
the BNC connector is protected behind a waterproof sheath.

The meter is also supplied with a stainless steel probe to
prevent potential grounding problems and thus ensuring
longer life for your electrode. The electrode has been de­signed for use in fertilizer solutions with high concentration
of phosphate and nitrate.

You can simply hang the meter right above the sample to
be tested for continuous measurement, and it will run
without interruption on 12 Vdc power supply.

Measurements are highly accurate and the meter can be
calibrated at one or two points.

1. Molded eye

2. “pH 4” calibration trimmer

3. BNC connector

4. HI 1283 stainless steel grounding probe

5. HI 1286 pH electrode

6. 12 Vdc power adapter

7. Power supply connector

8. Protective sheath

9. “pH 7” calibration trimmer

10. Liquid Crystal Display (LCD)

• Slide the protective sheath down, connect the HI 1286

pH electrode to the BNC connector and then slide the
protective sheath back up. Since the protective sheath is
rubberized, to ensure maximum waterproof protection,
make sure the connector is completely covered.

• 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 water and store
it with a few drops of storage (HI 70300) or pH7
(HI 7007) solution in the protective cap.

Always replace the protective cap after use.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR

STORAGE PURPOSES.

• If the electrode has been left dry, soak the tip in a

storage (HI 70300) or pH7 (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, then rinse it with tap water.

TAKING pH MEASUREMENTS

• Turn the meter on by connecting the 12 Vdc power
adapter to the meter and to the mains.

• In addition, the meter is supplied
with a differential input and
HI 1283 stainless steel probe to
prevent potential grounding prob­lems. Remove the protective cap
from the pH electrode and immerse
the tips (4 cm/1½”) of both pH
electrode and grounding probe into
the sample.

• The LCD will show the pH value. Allow
the reading to stabilize and the meter
will start continuous monitoring.

Note: To prolong the electrode life, after switching the meter

off, remove the electrode from the solution.

CALIBRATION

For the greatest accuracy, frequent calibration of the instru­ment is recommended. In addition, the instrument must be
recalibrated whenever:

a) The pH electrode is replaced
b) After testing aggressive chemicals
c) Extreme accuracy is required
d) At least once a month

PREPARATION

Pour small quantities of pH 7.01 (HI 7007) and pH 4.01
(HI 7004) solution into two clean beakers.
For accurate calibration use two beakers for each buffer
solution, the first one for rinsing the tip of the electrode and
the second one for calibration.

RINSE

HI 7007

As second point for calibration, pH 4.01 buffer (HI 7004) is
recommended for measuring acidic samples, while pH 10.01
(HI 7010) should be used if the samples to be tested are
alkaline.

CALIBRATION PROCEDURE

• Remove the protective cap from the
electrode, rinse and immerse it in
pH 7.01 buffer solution together
with the grounding probe. Stir gen­tly and wait a couple of minutes for
the reading to stabilize.

Note: the electrode should be sub-

merged approximately 4 cm
(1½”) in the solution.

CALIBRATION

HI 7007

(1½")

4 cm

• With the supplied screwdriver,
adjust the “pH 7” calibration
trimmer until the display shows
“7.0” pH.

• Rinse and immerse pH electrode and grounding probe in
pH 4.01 (or pH 10.01) buffer solution.

• Stir gently, wait a couple of
minutes and adjust the “pH
4” trimmer until the LCD
shows “4.0” pH (or “10.0”
pH).

The calibration is now complete.

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.

CE DECLARATION OF CONFORMITY

ACCESSORIES

HI 1283 * Stainless steel grounding probe with 2 m

(6.6’) cable

HI 1286 Double junction, plastic body pH electrode

with 2 m (6.6’) cable and BNC connector

HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70010P pH 10.01 solution, 20 mL sachet (25 pcs)
HI 7004L pH 4.01 solution, 500 mL bottle
HI 7007L pH 7.01 solution, 500 mL bottle
HI 7010L pH 10.01 solution, 500 mL bottle
HI 70300L Electrode storage solution, 500 mL bottle
HI 7061L Electrode cleaning solution, 500 mL bottle
HI 710005 12 Vdc power adapter, US plug
HI 710006 12 Vdc power adapter, European plug

* To be replaced by authorized technical personnel only.

IST981401NR2 05/05