Portable EC Meter

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The portable EC meter conductivity meter LH-C6 is an instrument to test liquid conductivity

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Hangzhou Lohand Biological Technology Co.,Ltd

Zhejiang, China

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SETUP MODE
Power On
1. Press POWER once to turn the meter on.
2. Press POWER again to turn the meter off.
NOTE:
All operations are operational when the meter's power is on.
Temperature Units
Temperature unit ℃, Range [0.0 – 80.0]
Temperature unit ℉， Range [32.0 – 176.0]
Working Mode
MODE， enter into different modes：
1. Enter measurement mode as soon as the power is on.
2. Press MODE once，”uS”(“mS”) flash on the main display, and conductivity mode
3. Press MODE twice，” ppt”(“ppm”) flash on the Main Display, TDS mode
4. Press MODE three times “℃” flash on the Second Display, Degrees Celsius temperature unit mode.
5. Press MODE four times， and “℉” flash on the Second Display, Degrees Fahrenheit temperature unit mode.
6. Press MODE five times， “Calibrating” flash on the Second Display， Calibration mode.
7. Press MODE six times， “R” flash on the Main Display， and Restore factory default mode.
8. Press MODE seven times， “P.1” flash on the Main Display， TDS Coefficient Setup mode.
9. Press MODE eight times， “P.2” flash on the Main Display， Temperature Coefficient Setup mode.
A controlled temperature water bath is ideal for this procedure.
1. Immerse the probe into a sample of your solution and adjust the temperature coefficient to 0% (that is, no compensation) by performing the following:
2. Wait for 5 minutes. Note T1 and CT1 (conductivity at T1).
3. Condition the sample solution and probe to a temperature (T2) that is about 5°C to 10°C different from T1, and note the conductivity reading CT2.
NOTE: Record your results for future reference. Ideally, T1 and T2 should bracket your measurement temperature, and should not differ by more than 5°C.
4. Calculate the temperature coefficient of your solution according to the formula shown above.
5. Enter the temperature coefficient you calculated into the meter.
The calculated temperature coefficient will now be applied to all the meter readings.
To determine the conductivity of the TDS conversion factor for your solution:
Appendix
1. Factor—the conductivity to ppm TDS conversion factor. Multiply conductivity by this factor to get ppm TDS for the type of TDS reading needed.
2. 442—a formulation that most closely represents the conductivity to ppm relationship, on average, for naturally occurring fresh water.
3. TDS Your Material—These columns are for you to write in your application-specific conductivity-to-ppm values and conversion factors for future reference.
HOLD/SET
HOLD/SET， when in the Measurement Mode, it acts as a HOLD function.
When in the Setting Mode, it acts as a Confirmation or Selection function.
Set Temperature Units
1. Press MODE three times，“℃” flash on the Second Display, and press HOLD/SET to confirm the temperature unit.
When the meter connects to the probe, the current temperature value will show on the Second Display; on the other hand, show “Ur” on the Second Display and “Or” on the Main Display without the probe。
2. Press MODE four times, “℉” flash on the Second Display, and press HOLD/SET to confirm the temperature unit. When the meter connects to the probe, the current temperature value will show on the Second Display; on the other hand, show “Ur” on the Second Display and “Or” on the Main Display without the probe.

Calibration

In the Conductivity Measurement Mode
1. Immerse the probe in the standard solution until READY shows. (Get high accuracy, please immerse the probe for 3min or longer.)
2. Press MODE five times, Calibrating flash on the Second Display, and press HOLD/SET to enter Calibration Mode. (Calibrating stop flashing)
3. The meter will automatically recognize the standard solution and automatic calibration. During this process, the calibration value will be shown on the Second Display.
4. After Calibration, the meter automatically returns to Measurement Mode.
At most 2 points calibration: 1413uS and 12.88mS, when the solution cannot be recognized, show “Err” for 2s. Then automatically returns to Measurement Mode.
Note：
For high accuracy, we recommend that users should regularly calibrate. In the following situation, users must recalibrate meters.
Replace probe
● After measuring aggressive chemicals
● Note： TDS don’t need to be calibrated after Calibration of conductivity, because there is a certain Coefficient between TDS and conductivity value. Calibration should be on fixed value solution, the Coefficient between TDS and conductivity value is adjustable. Normally, don’t calibrate TDS.

Conductivity at 25°C	TDS KCl		TDS NaCl		TDS 442		TDS Your Material
Conductivity at 25°C	ppm Value	Factor	ppm Value	Factor	ppm Value	Factor	ppm Value	Factor
1413 μS	744.7	0.5270	702.1	0.4969	1000	0.7078
12880 μS	7447	0.5782	7230	0.5613	11,367	0.8825