Horiba LAQUAtwin-EC-11, LAQUAtwin-EC-22, LAQUAtwin-EC-33 Operating Manual
Instruction Manual (Operation)
COMPACT WATER QUALITY METER
LAQUAtwin-EC-11, LAQUAtwin-EC-22,
LAQUAtwin-EC-33
Specifications
Model LAQUAtwin-EC- 11 22 33
Minimum sample volume 0.12 mL
Range and resolution (valid digits)
Conductivity
0 to 199 S/cm:
200 to 1999 S/cm:
2.00 to 19.99 mS/cm:
20.0 to 199.9 mS/cm: 0.1 mS/cm
TDS 0.0 to 99.9 ppm:
100 to 999 ppm:
1000 to 9990 ppm:
Calibration Up to 2 points
Up to 3 points
Accuracy
Temperature display 0 to 50.0C
Target Electrical conductivity
Measurement
principle
Display Custom (monochrome) digital LCD with
Operating
environment
Power CR2032 batteries (2)
Battery life Approx. 400 h continuous operation
Outer dimensions/mass
Main function T emperature compe nsation (2%/C fixe d),
*1
2% full scale (for each range)
2% full scale (0 to 19.99 mS/cm)
5% full scale (20.0 to 199.9 mS/cm)
2 electrode bipolar AC
Titanium coated with Platinum black
backlight
5 to 40C, 85% or less relative humidity
(no condensation)
164 29 20 mm (excluding projections),
Approx. 45 g (excluding batteries)
waterproof
matic power OFF
1 S/cm
1 S/cm
0.01 mS/cm
0.1 ppm
1 ppm
10 ppm
*3
, auto stable/auto hold, auto-
*2
*1 Accuracy is the closeness of agreement between
the measured value and actual value of the standard solution in the measurement of the same
standard solution as the one used for the calibration. Temperature during the calibration and measurement is the same. The error of standard
solutions and rounding error (1 digit) are not
included.
*2 The life period if the meter is used in the backlight
off mode. If the backlight is used, battery life will
shorten.
*3 IP67: no failure when immersed in water at a
depth or 1 meter for 30 minutes.
Please note that the meter can not be used
underwater
Items in package
Items Quantity
Sensor S070 1
Meter 1
Storage case 1
Batteries CR2032 2
Standard solution 1413 μS/cm 1
12.88 mS/cm 1
Pipette 1
Conditioning solution 1
Instruction manual (Operation) 1
Instruction manual (Before use) 1
Consumable parts sold separately
Items Specifications Part No.
Sensor S070, COND 3200459672
Standard
solution
Conditioning
solution
514-22, 1413 μS/cm 3999960110
514-23, 12.88 mS/cm 3999960111
514-20 3999960114
Part Names
2
1
3
4
7
Note
Press the switches 0.5 seconds or more u nless
otherwise specified.
1 Measurement cell
2 Protection cover
3 Lithium batteries
5
8
4 MEAS switch
5 ON/OFF switch
6
6 CAL switch
7 Waterproof gasket
8 Strap eyelet
Initial Setup
Attaching/detaching the sensor
Attaching the sensor
1. Power OFF the meter.
2. Confirm that the waterproofing gasket is
clean and undamaged.
3. Slide the sensor onto
the meter so that
catch "A" on the back
of the meter fits into
hole "a" on the sensor tongue as shown.
Note
Be careful not to twist the waterproof gasket.
Waterproof
gasket
a
Detaching the sensor
1. Power OFF the meter.
2. Lift the sensor tongue
tip and slide the sensor
a little away from the
meter.
3. Pull out the sensor all the way from the
meter.
Inserting/removing batteries
Inserting the batteries
1. Power OFF the meter.
2. Slide both batteries into
the battery case as
shown.
Be sure to use two
CR2032 batteries, and put
them with the plus sides
Battery clip
(+) upwards.
Removing the batteries
1. Power OFF the meter.
2. Use a ball-point pen or
other tool to pry the batteries out from the clips as
shown.
Electrode conditioning
Note
Before using the sensor for the first time or
after several days of disuse, perform electrode
A
conditioning.
Perform calibration after electrode condition-
ing.
1. Place some drops of the conditioning solution into the measurement cell.
2. Wait 10 min before use.
There is no need to switch the meter ON.
Battery
3. Clean the flat sensor with running water.
LAQUAtwin series (EC) Operation
CODE: GZ0000472457
March, 2017
1 2017 HORIBA Advanced Techno Co., Ltd.
Basic Operation
Power ON
1. Press and hold the ON/
OFF switch.
The power is switched ON,
and the meter model number is displayed on the LCD.
Power OFF
1. Press and hold the ON/OFF switch.
The power is switched OFF.
Precaution on sample setting
Place an appropriate amount of a sample or standard solution into the measurement cell without
trapping bubbles inside. If not, the measurement
may be inaccurate.
Appropriate Too little
Cell Electrode
Cross-section of the measurement cell
Calibration
Calibration is required before measurement.
Use standard solution within the measurement
range in the specifications.
Tip
Calibration values are saved even if the meter
is switched OFF.
Calibration value is rewritten if calibration is
repeated using the same standard solution.
Calibration points
The number of calibration points is dependent on
the meter model.
LAQUAtwin-EC-1 1:
Up to two-point calibration at 1413 μS/cm and
12.88 mS/cm
LAQUAtwin-EC-22 and LAQUAtwin-EC-33:
Up to three-point calibration at 1413 μS/cm,
12.88 mS/cm, and 111.8 mS/cm
Multi-point calibration
1. Open the protection cover and place some
drops of the standard solution into the
measurement cell.
Rinsing the sensor with the standard solution
beforehand will provide a more accurate calibration as it will reduce sample crossover contamination.
2. Close the protection cover and press the
CAL switch.
and blink, and the calibration value is
displayed.
Protection cover
After the calibration is complete, and
stop blinking and the measured value is displayed.
The calibration value at 25C is displayed for 1
s and the display returns to the measurement
mode automatically.
3. Open the protection cover and remove the
standard solution. Then remove moisture
on the sensor by gently dabbing with a so ft
tissue.
This completes the 1st point calibration.
4. To perform 2nd point calibration, repeat
steps 1. to 3.
Calibratio n error
If blinks and Er4 (error display) appears, the calibration
has failed.
Perform electrode conditioning.
Check that the correct standard solution is used,
and repeat calibration after cleaning the sensor.
If the calibration repeatedly fails when using the
correct standard solution(s), the sensor may
have deteriorated. Replace the sensor with new
one.
Measurement
Sample setting
1. Open the protection cover and put some
drops of sample into the measurement cell.
2. Close the protection cover.
Measurement mode
The auto stable (AS) mode and the auto hold
(AH) mode can be selected. Refer to " Measurement mode change" (page 4) for the operation to set the measurement mode.
Auto stable (AS) mode
This is the default setting. appears when
the measured value meets the stability criteria.
If the value changes, disappears.
1. Confirm that the meter is in the measurement mode, and place a sample on the sensor.
When the read value meets
the stability criteria,
appears and the reading is
locked.
2. Document the displayed value when
appears.
If the read value does not meet the stability criteria, disappears and the reading changes
with time.
Auto hold (AH) mode
appears when the measured value meets
the stability criteria. The reading then locks
and will not change until the MEAS switch is
pressed for the next measurement.
1. Confirm that the meter is in the measurement mode, and place a sample on the sensor.
2. Press the MEAS switch.
The auto hold function is activated.
blinks until the mea-
sured value has stabilized.
When the measured value is stable, stops
blinking and the displayed value is locked with
and displayed simultaneously.
3. Document the displayed value.
4. Press the MEAS switch.
The auto hold function is deactivated and
disappears.
Be sure to perform this step before starting the
next measurement. Or, you may mistake the
displayed hold value for the next measured
value.
Note
If a measured value is out of the specified
measurement range, "Or" is displayed for
upper range and "Ur" is displayed for under
range.
Ambient air may cause the measured values
to fluctuate. To reduce environmental interference, close the protection cover.
When you have a problem with the calibration
or measurement, refer to frequently asked
questions.
Measurement display change
Measurement display change is available on
LAQUAtwin-EC-22 and LAQUAtwin-EC-33.
The display mode switches as follows by pressing the MEAS switch in the AS mode.
LAQUAtwin-EC-22:
Between conductivity and temperature alternately
LAQUAtwin-pH-33:
Among conductivity, TDS, and temperature
LAQUAtwin series (EC) Operation 2 CODE: GZ0000472457
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