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:				1 S/cm
		200 to 1999 S/cm:				1 S/cm
		2.00 to 19.99 mS/cm:				0.01 mS/cm
		20.0 to 199.9 mS/cm:				0.1 mS/cm
		TDS	0.0 to 99.9 ppm:			0.1 ppm
			100 to 999 ppm:			1 ppm
			1000 to 9990 ppm:			10 ppm
	Calibration			Up to 2 points
				Up to 3 points
Accuracy*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)
	Temperature display				0 to 50.0 C
Target				Electrical	conductivity
Measurement				2 electrode bipolar AC
principle				Titanium coated with Platinum black
Display				Custom (monochrome) digital LCD with
				backlight
Operating				5 to 40 C, 85% or less relative humidity
environment				(no condensation)
Power				CR2032 batteries ( 2)
Battery life				Approx. 400 h continuous operation*2
Outer dimen-				164 29 20 mm (excluding projections),
sions/mass				Approx. 45 g (excluding batteries)
Main function				Temperature compensation (2%/ C fixed),
				waterproof*3, auto stable/auto hold, auto-
				matic power OFF

LAQUAtwin series (EC) Operation

*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	514-22, 1413 μS/cm	3999960110
solution
	514-23, 12.88 mS/cm	3999960111
Conditioning	514-20	3999960114
solution

1

Part Names

		2		1	Measurement cell
				2	Protection cover
	1			3	Lithium batteries
		4	5 8	4	MEAS switch
			6	5	ON/OFF switch
				6	CAL switch
		3		7	Waterproof gasket
				8	Strap eyelet
		7

Note

Press the switches 0.5 seconds or more unless otherwise specified.

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

Waterproof gasket

a A

Be careful not to twist the waterproof gasket.

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	Battery
CR2032 batteries, and put	Battery clip
them with the plus sides
(+) 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 conditioning.

Perform calibration after electrode conditioning.

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.

3.Clean the flat sensor with running water.

CODE: GZ0000472457

March, 2017

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-11:

Up to two-point calibration at 1413 μS/cm and

12.88mS/cm

LAQUAtwin-EC-22 and LAQUAtwin-EC-33: Up to three-point calibration at 1413 μS/cm,

12.88mS/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 dis-

played.

The calibration value at 25 C 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 soft tissue.

This completes the 1st point calibration.

4.To perform 2nd point calibration, repeat steps 1. to 3.

Calibration error

If blinks and Er4 (error dis-

play) 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 cri-

teria, 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 measured 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