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ELECTRONIC TESTING EQUIPMENT – TDS METER
'Total Dissolved Solids' meter to ascertain cleanliness of
system water and correct chemical treatment level.
• Rapidly demonstrates the cleanliness of heating system
water after a power flush.
• Simultaneous display of TDS and temperature.
• Large 4 digit display.
• Waterproof, dustproof, and rugged for use in damp
conditions.
• Battery life, ready and calibration indicators.
• Auto 'power off' prolongs battery life.
• Stainless steel electrodes for resistance and durability.
• Push button calibration.
Note
TDS is usually expressed as parts per million (p.p.m.), or
as mg/ litre. Before adding any chemical to system water,
the TDS level of the existing water should be checked
with the TDS meter, to ascertain a baseline level.
Issue: May 2023
Section F – Power Flushing Accessories
Taking a reading with the electronic TDS meter
1. Take a sample of at least 100ml of the water to be
tested in a suitable clean beaker / vessel, to a depth of
approx. 5cm.
2. Remove protective cap from the TDS meter.
3. Turn the TDS meter on by depressing the ON/OFF
button located on the front of the meter.
4. Immerse the TDS meter into the sample of water,
without touching the bottom of the sample container.
5. Stir gently and wait for the display reading to stabilise.
The TDS meter automatically compensates for
temperature variations, and variations on the meter
display can be due to the temperature sensor adjusting to
the sample temperature.
6. Read the figure from the display, which is in parts per
million of total dissolved solids (= mg/ litre).
To hold the display for easier reading, press 'HOLD' key.
Press 'HOLD' key again to release.
7. After taking the reading, remove the meter from the
sample, and flush with clean water before storing.
Page F.14
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