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Operating instructions
KBM-90 Measuring unit
Item no. 1763045
Intended use
The product is designed to measure conductance, TDS (the sum of all diluted salts), salinity,
as well as temperature using a removable measuring probe (combined probe) in water and
aqueous media. Typical applications include drinking water, waste water, surface water, swim-
ming pools, fish farms and process chemistry. The conductance provides information about
the ion content of a liquid. It is measured and displayed in S or μS. The temperature can be
measured in °C and °F. The measurements provide important information for drinking water
treatment, water monitoring and in industry and laboratories. The product is powered by four
1.5 V AAA batteries.
For safety and approval purposes, do not rebuild and/or modify this product. Using the product
for purposes other than those described above may damage the product. In addition, improper
use can cause hazards such as a short circuit or fire. Read the instructions carefully and store
them in a safe place. Only make this product available to third parties together with its operating
instructions.
This product complies with statutory, national and European regulations. All company and pro-
duct names contained herein are trademarks of their respective owners. All rights reserved.
Package contents
• Meter with measuring
• Standard solution 12.88
probe
mS/cm (50 ml)
• Calibration solution with
• Wrist strap
conductivity of 1413 µS/
• Hex key
cm (50 ml)
• 2x replacement screws for
Up-to-date operating instructions
To download the latest operating instructions, visit www.conrad.com/down-
loads or scan the QR code on this page. Follow the instructions on the web-
site.
Explanation of symbols
The symbol with an exclamation mark in a triangle is used to highlight important
information in these operating instructions. Always read this information carefully.
The arrow symbol indicates special information and tips on how to use the product.
Safety information
Read the operating instructions and safety information carefully. If you do not
follow the safety information and information on proper handling in these ope-
rating instructions, we will assume no liability for any resulting personal inju-
ry or damage to property. Such cases will invalidate the warranty/guarantee.
a) General information
• The device is not a toy. Keep it out of the reach of children and pets.
• Do not leave packaging material lying around carelessly. It may become a dan-
gerous toy for children.
• Protect the product from extreme temperatures, direct sunlight, strong jolts, flam-
mable gases, vapours and solvents.
• Do not place the product under any mechanical stress.
• If it is no longer possible to operate the product safely, stop using it and prevent
unauthorised use. Safe operation can no longer be guaranteed if the product:
- is visibly damaged,
- is no longer working properly,
- has been stored for extended periods in poor ambient conditions or
- has been subjected to any serious transport-related stress.
• Handle the product carefully. Jolts, impacts or a fall even from a low height may
damage the product.
• Consult a technician if you are not sure how to use or connect the product, or if
you have concerns about safety.
• Maintenance, modifications and repairs must be carried out by a technician or a
specialist repair centre.
• If you have questions which remain unanswered by these operating instructions,
contact our technical support service or other technical personnel.
Operating elements
a) Measuring unit
the battery compartment
cover
• Storage case
• 4x 1.5 V AAA batteries
• Operating instructions
b) LC display
Operation
a) Inserting/replacing the batteries
• Use the hex key to loosen the screws on the battery compartment cover (7) on the top of
• Insert the four 1.5 V AAA batteries (included) into the battery compartment, ensuring that
• Replace the battery compartment cover and screw it back into place. Ensure that sealing
• The batteries must be replaced when the display contrast drops significantly, when the
• If this occurs, replace the batteries. To replace the batteries, follow the steps above, ensu-
b) Persons and product
• People who set up, use and service the product must have sufficient knowledge
about the measuring process and the meaning of the measurements. This do-
cument provides valuable information on these topics. The instructions in this
document must be understood, observed and followed. To ensure that no risks
result from the interpretation of the measurements, the user must have specialist
knowledge – the user shall be liable for all damage/risks caused by incorrectly
interpreting the measurements due to insufficient knowledge.
• In schools, educational facilities, hobby and DIY workshops, the product must be
operated under the supervision of qualified personnel.
• Always comply with the accident prevention regulations for electrical equipment
when using the product in commercial facilities.
c) Batteries
• Check that the batteries are inserted with the correct polarity.
• To prevent battery leakage, remove the batteries if you do not plan to use the
product for an extended period. Leaking or damaged batteries may cause acid
burns if they come into contact with your skin. Always use protective gloves when
handling damaged batteries.
• Keep batteries out of the reach of children. Do not leave batteries lying around, as
there is a risk that children or pets may swallow them.
• All batteries must be replaced at the same time. Mixing old and new batteries can
cause the batteries to leak and damage the product.
• Batteries must not be dismantled, short-circuited or thrown into fire. Never rechar-
ge non-rechargeable batteries. This may cause an explosion!
8
7
6
5
9
4
3
2
10
1
11
E
D
C
B
A
the meter, and then remove the battery compartment cover.
they are inserted with the correct polarity (observe plus/+ and minus/- markings). The pola-
rity is indicated in the battery compartment. The two batteries on each side must be inserted
with the same polarity.
ring in the battery compartment cover is in the correct position.
device does not switch on, or when the battery status indicator (B) on the LC display (6)
indicates a low battery.
ring that you remove the old batteries before inserting the new batteries.
1 Measuring probe (replaceable)
2 Protective cap
3 Screw cap
4
button
5
button
6 LC display
7 Battery compartment cover
8 Eyelet (for the wrist strap)
9
button
10 Electrodes
11 Probe tip
A MIN symbol
F
B Battery status indicator
C MAX symbol
D Operating mode symbol bar
E Measured value
F Units symbol bar
G CAL calibration symbol
G
H Measured temperature value
H
I Temperature unit (°C or °F)
I
J Automatic temperature compensation
J
K
K Data hold symbol (HOLD)
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