Velleman DVM8681 User manual

DVM8681
USER MANUAL 4
GEBRUIKERSHANDLEIDING 10
MODE D’EMPLOI 16
MANUAL DEL USUARIO 22
BEDIENUNGSANLEITUNG 28
INSTRUKCJA OBSŁUGI 35
MANUAL DO UTILIZADOR 42

DVM8681
V. 03 –15/10/2018 2 ©Velleman nv

DVM8681
V. 03 –15/10/2018 3 ©Velleman nv

DVM8681
V. 03 –15/10/2018 4 ©Velleman nv
USER MANUAL
1. Introduction
To all residents of the European Union
Important environmental information about this product
This symbol on the device or the package indicates that
disposal of the device after its lifecycle could harm the
environment. Do not dispose of the unit (or batteries)
as unsorted municipal waste; it should be taken to a
specialized company for recycling. This device should be
returned to your distributor or to a local recycling
service. Respect the local environmental rules.
If in doubt, contact your local waste disposal authorities.
Thank you for choosing Velleman! Please read the manual thoroughly
before bringing this device into service. If the device was damaged in
transit, do not install or use it and contact your dealer.
2. Safety Instructions
This device can be used by children aged from
8 years and above, and persons with reduced
physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given
supervision or instruction concerning the use of the
device in a safe way and understand the hazards
involved. Children shall not play with the device.
Cleaning and user maintenance shall not be made by
children without supervision.
Do not disassemble or open the cover. There are no
user-serviceable parts inside the device. Refer to an
authorized dealer for service and/or spare parts.
Warning: Do not puncture batteries or throw them in
fire as they may explode. Do not attempt to recharge
non-rechargeable batteries (alkaline). Dispose of
batteries in accordance with local regulations. Keep
batteries away from children.

DVM8681
V. 03 –15/10/2018 5 ©Velleman nv
3. General Guidelines
Refer to the Velleman® Service and Quality Warranty on the last
pages of this manual.
Protect this device from shocks and abuse. Avoid brute
force when operating the device.
Familiarise yourself with the functions of the device before actually using it.
All modifications of the device are forbidden for safety reasons.
Damage caused by user modifications to the device is not covered
by the warranty.
Only use the device for its intended purpose. Using the device in
an unauthorised way will void the warranty.
Damage caused by disregard of certain guidelines in this manual
is not covered by the warranty and the dealer will not accept
responsibility for any ensuing defects or problems.
Keep this manual for future reference.
4. Features
waterproof housing (IP67)
dual display with ATC
data hold function
pen size, fits easily in the pocket
low battery indication
auto power off
°C of °F selectable
automatic calibration
calibration up to 3 points
5. Overview
Refer to the illustrations on page 2 of this manual.
1
measured pH reading
2
CAL –calibration mode
3
ATC –automatic temperature compensation
4
temperature reading
5
HLD –data hold
6
PWR –power button
7
CAL –calibration

DVM8681
V. 03 –15/10/2018 6 ©Velleman nv
6. Battery Installation
Refer to the illustrations on page 2 of this manual.
The display will blink when battery power is insufficient.
1. Loosen the two screws holding the battery cover. Do not
discard the small washer.
2. Insert 4 x LR44 button cell batteries respecting the polarity.
3. Close the battery compartment.
7. Operation
7.1 General Operation
Refer to the illustrations on page 3 of this manual.
1. Remove the bottom and the inner cap to expose the
electrode. It is normal to find some whitish crystals on the
inner cap and electrode. Keep the sponge in the cap wet
to keep the electrode in a good storage condition.
2. Dip the electrode into the test solution. Press PWR and stir
the pH meter to get a stable reading.
3. A small dot will be flashing while the meter is in measuring
mode. The temperature (in °C or °F) will also be displayed.
4. Press HLD to freeze the current reading. Note that the dot
will stop flashing. Press HLD again to release the reading.
5. Turn off the meter by pressing PWR. Cover the electrode
with the cap and store the meter at an ambient temperature
between 0°C ~ 50°C (32°F ~ 122°F). Refer to
“7.4. Calibrating your Meter” to perform the 3-points
calibration.
7.2 Auto Power-Off
1. This meter will switch off after
approximately 20 minutes of inactivity.
2. Disable this function by holding HLD and PWR
simultaneously pressed before power-on. An “n” will briefly
appear onto the display. The function has been disabled.
The function will be reactivated after every power-off.

DVM8681
V. 03 –15/10/2018 7 ©Velleman nv
7.3 Automatic Temperature Compensation (ATC)
1. Since pH values are temperature dependent, pH applications
require some form of temperature compensation to ensure
standardized pH values. This meter automatically corrects
the pH values based on the temperature of the measured
solution.
2. Hold CAL and PWR simultaneously pressed
before power-on. “°C” or “°F” will appear
on the display. Select your temperature unit
with HLD and press CAL to save.
3. “SA” will briefly appear on the display to
indicate the selection has been saved. This
selection will be saved after power-off.
7.4 Calibrating your Meter
1. Calibration is necessary and should be done regularly, even
on a daily basis when using the meter often.
2. Switch on your pH meter.
3. Place the electrode into the pH 4 test
solution (available at your chemist’s) and
press CAL to enter the calibration mode.
“CA” will briefly appear on the display. After
a few seconds “CAL” and the pH value will
appear on the display indicating the meter
has been calibrated.
4. Do the same with the pH 7 and pH 10 test solutions.
5. The meter will display “En” if the calibration
was not done correctly or if the probe could
not detect the test solution in the voltage
range below. In this case, recalibrate as per
above.
pH 4.00
pH 7.00
pH 10.00
97 mV….250 mV
-60 mV….60 mV
-250 mV….-97 mV

DVM8681
V. 03 –15/10/2018 8 ©Velleman nv
6. If the meter successfully recognizes the test solution, the
solution pH value (4, 7 or 10) will appear on the display. If
the displayed value differs slightly from the supposed value,
e.g. 4.01 instead of 4.00, press HLD to change the value. The
adjustable calibration range for pH 4 is 3.50 ~ 4.50, for pH 7
is 6.50 ~ 7.50 and for pH 10 is 9.50 ~ 10.50.
7. A stable value will automatically be saved.
8. Cleaning and Maintenance
Avoid touching the probe with bare hands and keep it wet by
moistening the sponge in the cap.
Rinse the probe with tap water or better, de-ionized water after
each measurement.
Remove the batteries from the meter if not used for a long time.
9. Troubleshooting
No display after power-on
Check the batteries. Replace them if necessary (see “6. Battery
Installation”).
Slow response
Clean the probe thoroughly with tap water and rinse with de-
ionized water afterwards.
Display indicates “- - -”
The pH value is out of the pH range (pH 0 ~ pH 14). The solution
is either too acid or too alkaline.
The displayed pH value is unstable
The probe is exposed. Dip it in the solution to be measured.
10. Technical Specifications
accuracy
0.2 pH
pH range
0 - 14
temperature accuracy
± 1°C
temperature resolution
0.5°C/°F
resolution
0.1 pH
ATC
yes
self-calibration
yes

DVM8681
V. 03 –15/10/2018 9 ©Velleman nv
dimensions
150 x 36 x 25 mm
weight
65 g
battery
4 x LR44 (incl.)
Use this device with original accessories only. Velleman nv
cannot be held responsible in the event of damage or injury
resulting from (incorrect) use of this device. For more info
concerning this product and the latest version of this manual,
please visit our website www.velleman.eu. The information in
this manual is subject to change without prior notice.
The Velleman nv warranty covers normal operation and does
not cover battery, misuse, abuse, alteration, tampering,
neglect, improper maintenance or damage resulting from
leaking batteries. Proof of purchase is required for warranty
repairs. Warranty is void if the meter has been opened.
© COPYRIGHT NOTICE
The copyright to this manual is owned by Velleman nv. All
worldwide rights reserved. No part of this manual may be copied,
reproduced, translated or reduced to any electronic medium or
otherwise without the prior written consent of the copyright holder.

DVM8681
V. 03 –15/10/2018 10 ©Velleman nv
GEBRUIKERSHANDLEIDING
1. Inleiding
Aan alle ingezetenen van de Europese Unie
Belangrijke milieu-informatie betreffende dit product
Dit symbool op het toestel of de verpakking geeft aan
dat, als het na zijn levenscyclus wordt weggeworpen, dit
toestel schade kan toebrengen aan het milieu. Gooi dit
toestel (en eventuele batterijen) niet bij het gewone
huishoudelijke afval; het moet bij een gespecialiseerd
bedrijf terechtkomen voor recyclage. U moet dit toestel
naar uw verdeler of naar een lokaal recyclagepunt brengen.
Respecteer de plaatselijke milieuwetgeving.
Hebt u vragen, contacteer dan de plaatselijke autoriteiten
betreffend de verwijdering.
Dank u voor uw aankoop! Lees deze handleiding grondig voor u het
toestel in gebruik neemt. Werd het toestel beschadigd tijdens het
transport, installeer het dan niet en raadpleeg uw dealer.
2. Veiligheidsinstructies
Houd buiten het bereik van kinderen en onbevoegden.
Dit toestel is niet geschikt voor gebruik door personen
(kinderen inbegrepen) met verminderde fysieke, zintuiglijke
of geestelijke capaciteiten of gebrek aan ervaring en kennis,
tenzij zij onder toezicht staan of instructie hebben gekregen
over het gebruik van het toestel van een persoon die
verantwoordelijk is voor hun veiligheid.
Houd toezicht op kinderen om te voorkomen dat ze met het
apparaat spelen.
Demonteer of open dit toestel NOOIT. Er zijn geen door de
gebruiker vervangbare onderdelen in dit toestel. Voor
onderhoud of reserveonderdelen, contacteer uw dealer.