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About Calibration
To ensure higher accuracy, the tester must be calibrated on a regular basis.
Calibration can be manual or automatic (only for ECTestr11 & ECTestr11+); 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
ECTestr11 & ECTestr11+ 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 (84uS,
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 (for only ECTestr11 & ECTestr11+ models).
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:
Note: If you have selected a specific measuring range for the tester, selecting multi-
Note:
Note:
Note:
point 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.
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1. Switch off the tester. Press and hold INC
INC key and then switch on the tester using
INC
INC
INC
ON/OFF
ON/OFF
ON/OFF
ON/OFF key.
ON/OFF
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:
Note:
Note:
Note:
Note: This mode is available only for ECTestr11 & ECTestr11+ models. For other
models, go directly to 1-point selection mode, described in step 4 below.
Press INC
INC
INC or DEC
INC
DEC
DEC
DEC key to select 'Yes' (to enable auto calibration) or 'No' (to disable
INC
DEC
auto calibration)
Note:
Note:
Note: Press °C/°F
Note:
Note:
°C/°F
°C/°F
°C/°F key, if you wish to skip this setting without confirming changes.
°C/°F
Note
Note
Note: Press °C/°F
Note
Note
°C/°F
°C/°F
°C/°F
°C/°F key twice, if you wish to return to measurement mode without
confirming changes.
3. Press HOLD/ENT
HOLD/ENT
HOLD/ENT key to confirm the selection. The display shows 'CO'.
HOLD/ENT
HOLD/ENT
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
INC
INC
INC or DEC
INC
DEC
DEC key to select 'Yes' (to enable 1-point calibration) or 'No' (to
DEC
DEC
disable 1-point calibration, i.e. to enable multi-point calibration).
Note:
Note:
Note:
Note:
Note: Press °C/°F
°C/°F
°C/°F
°C/°F
°C/°F key if you wish to skip this setting without confirming.
5. Press HOLD/ENT
HOLD/ENT
HOLD/ENT
HOLD/ENT key to confirm the selection. The display shows 'CO' for few
HOLD/ENT
seconds and then shows power-up sequence The tester goes to measurement
mode.
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1
YE S
Tester
Off
A.CAL
ON/OFF
Press & hold INC
key and switch on
the tester
A.CAL
Figure 6: Selecting auto calibrtaion & 1-point calibration for ECTestr11+
Auto Calibration
Auto calibration feature is available only for conductivity in ECTestr11 &
ECTestr11+ 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 multi-
point calibration (with AUTO measuring range), the tester automatically scans
tion:
tion:
tion:
tion:
through all possible calibration points until all of them are calibrated.
Selected Measuring Range
PU (0 to 200.0 uS/cm)
LO (0 to 2000 uS/cm)
HI (0 to 20.00 mS/cm)
AUTO
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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.
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1. Switch on the tester. Make sure the tester is in measuring mode. Press INC
DEC
DEC
DEC key to enter conductivity calibration mode.
DEC
DEC
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 uS & 12.88 mS (for
ECTestr11) or 84 uS, 1413 uS & 12.88 mS (for ECTestr11+) if the
measuring range of the tester is set to AUTO.
2
3
4
After
HOLD
HOLD
1 sec.
ENT
ENT
CO
Y E S
CO
A.CAL
2
4
Sequence
HOLD
HOLD
ENT
ENT
Calibration Standard
84 us
1413 uS
12.88 mS
84 us, 1413 uS, 12.88 mS
tion standards: ds: ds: ds: ds:
tion standar
tion standar
tion standar
tion:
tion:
tion:
tion:
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Note:
Note:
5
Note:
Note:
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:
Note:
Note: For multi-point calibration, the lower display automatically locks at the
Note:
Note:
Power-up
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:
Note:
INC
INC
DEC
DEC
Note:
Note: Press INC
Note:
INC
INC or DEC
DEC
DEC key if you wish to exit from auto calibration, during any of
the above steps.
5. Press HOLD/ENT
HOLD/ENT
HOLD/ENT
HOLD/ENT key to confirm the calibration. LCD shows 'CO' for 2 seconds. The
HOLD/ENT
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 showing 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:
Note:
Note:
Note:
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:
Note:
Note: The tester shows error message 'Er.1' if you press HOLD/ENT
Note:
Note:
tester recognizes the calibration standard.
2
CAL
ATC
1
CAL
Measurement
Mode
OR
Displayed for
2 seconds and
tester goes to
calibration mode
The two calibration stds. values
displayed sequentially until
tester finds a matching solution
within
6
CAL
ATC
1410
12.80
mS
INC
INC
INC
INC or
12.88
The next calibration std.
Tester dipped in
12.88 mS std. solution
displayed until tester finds
a close match within
& automatically detects
the calibration std.
±
50% tolerance
Figure 7: Two-point automatic calibration sequence for ECTestr11
HOLD/ENT
HOLD/ENT
HOLD/ENT key before the
HOLD/ENT
3
4
5
CAL
ATC
CAL
ATC
CAL
ATC
HOLD
ENT
0.0
1410
1410
uS
uS
uS
1413
1413
CO
Tester dipped in
Confirmation of 1st point
displayed for
1413 uS std. solution
3
and automatically detects
2 seconds
CAL
ATC
the calibration std.
0.0
uS
12.88
±
50% tolerance.
CAL
ATC
CAL
ATC
HOLD
ENT
12.80
Measurement
Mode
mS
mS
12.88
CO
Confirmation of 2nd point
displayed for
2 seconds
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