Before You Begin
Remove the electrode’s protective cap. Soak the electrode for a few minutes in alcohol to remove
any oil stains on the electrodes which will affect the accuracy of the tester. Rinse thoroughly
with de-ionized water and shake off dry.
Note
: INC & DEC keys are located inside the battery compartment. Refer figure 1.
Note
: For ECTester11, the caption of HOLD key is ‘HOLD/ENT’ °C/ ° F
Figure 1: Battery compartment
Switching On
Press ON/OFF key to switch on the tester. The LCD shows the power-up sequence as illustrated in
Figure 2. When the tester is on, if you do not press a key for 8.5 minutes, the tester automatically
switches off to conserve batteries.
Figure 2: Power Up Sequence
Range Selection
Depending on the selected model, you can set the tester to limit its reading to a particular
measuring range (LO or HI) or full scale (AUTO). The default setting is AUTO. When you select
a range other than AUTO, the tester can be calibrated only for that particular range. If you
try to measure a sample which has a higher conductivity/TDS value than that of the selected
measuring range, the LCD shows ‘OR’ error message. Refer Specifications section for available
ranges of the selected model.
To select a range:
1. Switch off the tester. Press and hold °C/°F key and then switch on the tester using ON/OFF
key. Release °C/°F key.
2. The tester goes to range selection mode. The LCD shows the currently selected Range (the
default is AUTO) in the lower display. The upper display shows the maximum possible reading for
the selected range. Press HOLD key repeatedly until you see the required range (LO or HI).
Note:
If no key is pressed within 5 seconds, LCD shows power-up sequence and tester goes
to measurement mode.
3. The tester automatically confirms the last selection if no key is pressed for 5 seconds. Upper
display momentarily shows ‘CO’. The LCD shows power-up sequence and the tester goes to
measurement mode.
Measurement
1. Press the ON/OFF key to switch on the tester. The ‘MEAS’ indicators appears when the tester
is in measurement mode.
2. Dip the electrode into the test solution making sure that it is fully immersed. Stir to clear any
trapped air bubbles from the electrode and let the reading stabilize.
Note
: The LCD indicates
‘Or’ (over range) if the reading is outside the selected range. If this occurs, select an appropriate
range to suit the reading.
3. The upper display shows the main reading (conductivity/TDS/Salt) of the solution, automatically
temperature compensated (ATC) to normalized temperature of 25°C. The lower display shows
the temperature of the solution.
HOLD Function
This feature lets you freeze the display for a delayed observation.
1. Press HOLD key to freeze the measurement. The tester goes to hold mode and ‘HOLD’ indicator
is displayed in LCD. The measurements are frozen and the ‘MEAS’ indicator disappears.
2. Press HOLD key again to release the measurement. The ‘HOLD’ indicator is no longer displayed.
The tester goes back to measurement mode.
Temperature Unit of Measurement Selection
This feature lets you set the unit of measurement of temperature to either Celsius (°C) or Fah-
renheit (°F). When the tester is in the measurement mode, press °C/°F button. The temperature
display toggles between the Celsius and Fahrenheit reading.
About Calibration
To ensure higher accuracy, the tester must be calibrated on a regular basis. Calibration can be
manual or automatic (only ECTester11); calibration can be 1-point or multi-point. You can choose
any combination of the above two options for calibration. If you calibrate the tester for 1-point,
the calibration is applied for all the measuring ranges. In applications where you need higher
accuracy, and when you intend to measure values in more than one range, it is recommended
to select multi-point calibration.
Selection of Automatic or Manual Calibration
ECTester11 models support both automatic & manual calibration while all other models have
to be calibrated manually. In automatic calibration, the tester automatically detects and verifies
known conductivity standard solutions (1413uS & 12.88mS) . In manual calibration, you can
use non-standard solutions which may be specific for your application. The factory default is
Automatic calibration (Auto). You can enable or disable automatic calibration as described
below (only ECTester11).
Selection of 1-point or Multi-point Calibration
The factory default is 1-point Calibration. For higher accuracy, it is recommended that you
calibrate the tester for multiple ranges if you intend to measure values in multiple ranges. You
can enable or disable multi-point calibration as described below.
Note
: If you have selected a specific measuring range for the tester, selecting multipoint calibration
has no meaning, as the tester can only be calibrated for 1-point for the selected range. Set the
tester to ‘AUTO’ measuring range if you wish to calibrate multi-points.
To enable/disable auto calibration and multi-point calibration:
1. Switch off the tester. Press and hold INC key and then switch on the tester using ON/OFF
key.
2. The tester goes to auto calibration selection mode. The lower display shows ‘A.CAL’ and the
upper display blinks the current choice (‘Yes’ or ‘No’).
Note:
This mode is available only for ECTester11 model, other models, go directly to 1-point
selection mode, described in step 4 below. Press INC or DEC key to select ‘Yes’ (to enable auto
calibration) or ‘No’ (to disable auto calibration)
Note:
Press °C/°F key, if you wish to skip this setting without confirming changes.
Note:
Press °C/°F key twice, if you wish to return to measurement mode without confirming
changes.
3. Press HOLD/ENT key to confirm the selection. The display shows ‘CO’.
4. The tester goes to 1-point calibration selection mode. The lower display shows ‘1.Pnt’ and
the upper display blinks the current choice (‘Yes’ or ‘No’).
Press INC or DEC key to select ‘Yes’ (to enable 1-point calibration) or ‘No’ (to disable 1-point
calibration, i.e. to enable multi-point calibration).
Note
: Press °C/°F key if you wish to skip this setting without confirming.
5. Press HOLD/ENT key to confirm the selection. The display shows ‘CO’ for few seconds and
then shows power-up sequence The tester goes to measurement mode.
Auto Calibration
Auto calibration feature is available only for conductivity in ECTester11 models. Make sure that
‘auto calibration’ is enabled as described in the previous section. Auto calibration is suitable if
you use standard conductivity solutions for calibration process. If you selected 1-point calibration,
you need to choose a calibration standard corresponds to the selected measuring range of the
tester listed below. If you have selected multi-point calibration & AUTO measuring range, you
can choose any of the calibration standards listed below. During auto calibration, the tester
recognizes the calibration standard if its value is within 50% tolerance. For multipoint calibration
(with AUTO measuring range), the tester automatically scans through all possible calibration
points until all of them are calibrated.
Selected Measuring Range
Calibration Standard
LO (0 to 2000 μS/cm)
1413 μS
HI (0 to 20.00 mS/cm)
12.88 mS
AUTO
1413 μS, 12.88 mS
To prepare calibration standards:
Use fresh calibration standard solutions listed in the above table. Prepare each solution in two
beakers - one for rinsing and the other for calibration. Rinse the electrode in de-ionized water
before calibration.
To o begin automatic calibration:
1. Switch on the tester. Make sure the tester is in measuring mode. Press INC or DEC key to
enter conductivity calibration mode.
2. ‘CAL’ indicator appears in LCD. The display briefly shows ‘CAL’ and the number of points the
tester will be calibrated.
3. The upper display shows the conductivity reading and the lower display sequentially shows
calibration standard values 1413 μS & 12.88 mS (for ECTester11) if the measuring range of the
tester is set to AUTO.
Note
: If you have selected a specific measuring range for the tester, the lower display shows the
corresponding calibration standard value that matches the selected measuring range.
4. Rinse the electrode with the calibration standard that you intend to calibrate and then dip the
electrode in the other beaker with same calibration standard. Swirl gently to create a homogenous
sample and allow time for the reading to stabilize.
Note:
For multi-point calibration, the lower display automatically locks at the calibration standard
value that closely matches. The tolerance range is ± 50% of the calibration standard. The tester
shows error message ‘Er.1’ if you try to calibrate with a solution whose conductivity is outside
the tolerance range.
Note:
Press INC or DEC key if you wish to exit from auto calibration, during any of the above
steps.
5. Press HOLD/ENT key to confirm the calibration. LCD shows ‘CO’ for 2 seconds. The calibration
is complete and the tester returns to measurement mode, if this is a 1- point calibration.
6. For multi-point calibration, the tester goes to the next calibration point, lower display sho-
wing next calibration standard values. Rinse the electrode in de-ionized
water and repeat step 4 & 5 to continue calibrating with next calibration
standard solution.
Note:
The tester shows error message ‘Er.0’ and returns to measuring
mode if the temperature of the calibration solution is not within 0°C
to 50°C.
Note:
The tester shows error message ‘Er.1’ if you press HOLD/ENT key
before the tester recognizes the calibration standard.
GB
• Large Screen
• Waterproof
• Multi Range
Conductivity/
TDS/Salt Tester
with Tempera-
ture Display
Instruction
manual
EC/TDS/SALT 11
