PRELIMINARY EXAMINATION
Thank you for choosing Milwaukee Instruments!
While taking out the meter from the packaging, make sure that it was
not damaged during shipping. Please notify your closest Milwaukee
office if it was damaged.
The EC40 is delivered in a plastic tube and is supplied complete with:
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3 x 1.5V AA batteries
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Instrument quality certificate
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Instruction manual
Note: Keep all packing material until you have verified that the
instrument works correctly. Defective or damaged items must be
returned in their original packing material.
GENERAL DESCRIPTION
The EC40 Nutrient stick is designed to measure the EC (conductivity) of
the nutrient solutions used in agriculture and hydroponic applications.
It features a visual alarm that blinks if the measured value is above the
set point. The EC40 is built in a compact, waterproof and floating casing.
FEATURES
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Readings are displayed on an easy to read graph bar with 20 LEDs.
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The readings are displayed in four measuring scales: CF, EC, PPM500
and PPM700.
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When the reading is out of range, the top or bottom LED blinks.
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The alarm set point can be easily adjusted.
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The meter is factory calibrated and does not require any calibration.
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The meter switches on and off automatically.
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Battery level indicator activates when you insert the batteries into
the instrument.
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Its compact, waterproof and floating design makes the meter water
resistant and ideal to mix the nutrient solution in the tank.
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The probe is protected by a crown-shaped ring which is detachable
so it is easy to clean.
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The meter is supplied with a wrist strap.
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Essential operational instructions are printed on the meter.
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The meter has a graphite EC probe with a built-in temperature sensor,
housed in a stainless-steel casing, which compensates temperature
in seconds.
SPECIFICATIONS
Range
0.2 to 4 mS/cm
2 to 40 CF
140 to 2800 ppm 0.7
100 to 2000 ppm 0.5
Resolution
0.1 mS/cm
1 CF
70 ppm (factor: 700 ppm = 1 mS)
50 ppm (factor: 500 ppm = 1 mS)
Accuracy
± 4% of reading ± 1 resolution point
Calibration
Factory calibrated
Probe
Graphite electrode in ABC + PC body
Temperature
compensation
Automatic from 5.0 to 50.0 ºC
(41.0 to 122.0 ºF)
Battery type
3 x 1.5V AA alkaline
Battery life
about 3 years (at 10 measurements per day)
Measurement display
20 blue LEDs bar
Environment
0 to 50 ºC (32.0 to 122.0 ºF); max. RH 95%
Dimensions
420 mm (17”) length, 30 mm (1.2”) diameter
Weight with batteries
255 g. (9 oz.)
Casing protection
IP67, floating
OPERATIONAL GUIDE
When immersed, the meter starts measuring automatically and
displays current Electrical Conductivity level. Auto shut-off time is set at
20 seconds after the measurement has stabilized.
Switching the Meter On
The meter switches on when the batteries are placed inside.
It performs a self-test to identify possible LED issues. The LEDs turn
on one by one from the bottom to the top and then reverse top to
bottom. Then, the LED bar shows the voltage level of the batteries for
a few seconds. If the top LED is on it means that batteries are fully
charged. If the bottom LED is on, it indicates low charge. In this case,
please change the batteries.
Measurement
1. Place the head of the probe in the nutrient solution. The meter
switches on automatically and starts measuring.
2. An LED light turns on once the reading has stabilized. The readings
are displayed in four measuring scales: CF, EC, PPM500 and PPM700.
If 2 LEDs are on, the measured value is between those two values.
3. Continuously blinking LED/LEDs indicate that the measured value is
over the alarm set point.
4. The meter remains on for approximately 20 seconds. If the EC value
changes, auto shut-off time is automatically reset. The meter stops
measuring if the read value drops below minimum value.
5. The top/bottom LED is blinking when the measurement is over/
under range.
Alarm Set Up
1. Rotate the battery cap counter-clockwise and remove it.
2. Push the SETUP button once.
3. The LED turns on and displays the last set alarm value.
4. To change the alarm value, push and hold the SETUP button. The
LED bar increases gradually. Release the button to save the new
alarm value.
5. To disable the alarm, release the SETUP button when the top and
bottom LEDs are on.
6. Put back the battery cap.
Calibration
The meter is factory calibrated and does not require user calibration.
CLEANING & MAINTENANCE
Frequent cleanings are recommended to ensure accurate
measurements.
1. Twist the crown-shaped ring 30 degrees counter-clockwise then
remove it.
2. Clean the head of the probe under running tap water.
3. If required, clean the graphite sensors with a couple drops of dish
liquid detergent, and scrub off any residue with a toothbrush.
4. Rinse the probe under running tap water.
STORAGE
Make sure that the probe is clean and dry before storing it in its
protective packaging.