User manual
This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microlming, or the capture in
electronic data processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited.
This publication represent the technical status at the time of printing.
© Copyright 2016 by Conrad Electronic SE. *101138_v3_0716_02_mh_m_en
Commissioning
Do not touch or wipe the surface of the inner sensor of the electrode.
• Remove the protection cap and rinse the electrode with clean water. Then, wipe
it dry.
• Open the battery compartment at the top and take out the screw driver.
• Press the on/off button to turn it on.
• The measuring stick turns off automatically after 5 minutes.
Calibration
• Rinse the conductivity electrode with distilled or deionised water (also before
and after every use/measuring) and rub it dry. Dip the conductivity electrode into
the standard solution (1413 μS/cm), included in delivery, stir it briey and wait
until the display has stabilised (up to 5 minutes). Adjust the reading to 1413 at
25 ºC by turning the control marked “SPAN” located at the left side of the battery
compartment with the screwdriver.
• Rinse the electrode with clean water and wipe it dry.
It is not necessary to calibrate the LWT-02 / LWT-03 before each
measurement. It is recommended to carry out a calibration after every
tenth measurement or every two weeks.
Measuring
• Dip the electrode into the sample solution.
• Stir gently and wait until a stable reading is obtained.
• Rinse the electrode with clean water and cover it with the protective cap after use.
Replacing battery
When the batteries are empty, the measuring stick turns off automatically
within 3 seconds after being switched on.
• Change batteries when the display fades or ashes.
• Screw in an anti-clockwise direction to open the battery compartment at the top.
• Replace the CR2032 battery, observing the correct polarity.
• Close the battery compartment.
Replacing electrode
• Remove the protective cap.
• Screw the electrode collar in an anti-clockwise direction to remove it.
• Pull out the electrode module carefully. Do not damage the pins on the body.
• Plug a new electrode into the body carefully.
• Screw the electrode collar in a clockwise direction to fasten it.
Disposal
a) Product
Electronic devices are recyclable waste and must not be disposed of in
the household waste. At the end of its service life, dispose of the product
according to the relevant statutory regulations.
Remove any inserted (rechargeable) batteries and dispose of them
separately from the product.
b) Batteries/rechargeable batteries
You as the end user are required by law (Battery Ordinance) to return all
used batteries/rechargeable batteries. Disposing of them in the household
waste is prohibited.
Contaminated (rechargeable) batteries are labelled with this symbol to
indicate that disposal in the domestic waste is forbidden. The designations
for the heavy metals involved are: Cd = Cadmium, Hg = Mercury, Pb =
Lead (name on (rechargeable) batteries, e.g. below the trash icon on the
left).
Used (rechargeable) batteries can be returned to collection points in your municipality,
our stores or wherever (rechargeable) batteries are sold.
You thus full your statutory obligations and contribute to the protection of the
environment.
Technical Data
Supply voltage ........................ 2 x 3 V/DC, button cell type CR2032
Measurement range ............... 0 to 19990 μS/cm (Item No. 101138)
0 to 1999 μS/cm (Item No. 101139)
Resolution ............................... 10 μS/cm (Item No. 101138)
1 μS/cm (Item No. 101139)
Accuracy ................................. ±2 % FS
Protection level ....................... IP57
Dimensions ............................. 37 x 168 mm (Ø x L)
Weight .................................... 85 g