How to Calibrate Your HM Digital TDS-3 Handheld TDS Meter

If you own an HM Digital TDS-3 Handheld TDS Meter, it is important to calibrate it regularly to ensure accurate readings. Calibration is the process of adjusting the meter to a known standard to ensure its accuracy. In this article, we will guide you through the steps to calibrate your HM Digital TDS-3 Handheld TDS Meter.

Before you begin the calibration process, make sure you have a calibration solution with a known TDS value. This solution should be close to the expected TDS range of the water you will be testing. The HM Digital TDS-3 Handheld TDS Meter comes with a carrying case that includes a small bottle of calibration solution, making it convenient for users to calibrate their meters.

To start the calibration process, turn on the TDS meter by pressing the power button. Once the meter is on, immerse the probe into the calibration solution. Make sure the probe is fully submerged in the solution and give it a few seconds to stabilize. The meter will display the TDS value of the calibration solution.

FCT-8350 Flow Transmitter
Measurement range	Instantaneous flow:(0~2000)m3/h;Accumulated flow:(0~99999999)m3
Flow rate	(0~5)m/s
Applicable pipe diameter	DN 25~DN 1000 for selection
Resolution	0.001 m3/h
Renew interval	1S
Accuracy	2.0 level
Repeatability	±0.5%
Probe input	Range :0.5Hz~2KHz;Power supply:DC 12V(instrument supply)
Analog output	(4~20)mA,Instrument/transmitter for selection;
Control output	Semi-conductor photo electronic relay,Load current 50mA(max),AC/DC 30V
Control mode	Instantaneous flow high/low limit alarm, flow variable frequency conversion
Working power	DC24V
Power consumption:	<3.0W
Cable length	5m as standard ; or(1~500)m for selection
Working environment	Temp.:(0~50)℃;relative humidity≤85%RH(non condensation)
Storage environment	Temp.:(-20~60)℃; relative humidity:≤85%RH(non condensation)
Protection level	IP65(with back cover)
Dimension	96 mm×96 mm×94mm (H×W×D)
Hole size	91mm×91mm(H×W)
Installation	Panel mounted,fast installation

Next, press and hold the CAL button on the meter for a few seconds until the display starts flashing. This indicates that the meter is in calibration mode. Use the calibration screwdriver that comes with the meter to adjust the reading to match the known TDS value of the calibration solution. Turn the screwdriver clockwise to increase the reading and counterclockwise to decrease it.

Continue adjusting the reading until it matches the known TDS value of the calibration solution. Once you are satisfied with the calibration, press the CAL button again to exit calibration mode. The meter will now display the calibrated TDS value.

It is recommended to recalibrate your HM Digital TDS-3 Handheld TDS Meter periodically to ensure accurate readings. Factors such as temperature, humidity, and usage can affect the accuracy of the meter over time. By calibrating the meter regularly, you can maintain its accuracy and reliability.

In addition to calibration, it is important to properly care for your TDS meter to prolong its lifespan. Always rinse the probe with clean water after each use to remove any residue or contaminants. Store the meter in its carrying case when not in use to protect it from damage.

In conclusion, calibrating your HM Digital TDS-3 Handheld TDS Meter is essential for accurate water testing. By following the steps outlined in this article, you can ensure that your meter provides reliable TDS readings. Remember to use a calibration solution with a known TDS value and recalibrate the meter periodically to maintain its accuracy. Proper care and storage of the meter will also help prolong its lifespan.

The Importance of Regularly Cleaning and Maintaining Your HM Digital TDS-3 Handheld TDS Meter

In the world of water quality testing, the HM Digital TDS-3 Handheld TDS Meter is a popular choice for professionals and hobbyists alike. This compact device measures the total dissolved solids (TDS) in water, providing valuable information about its purity and overall quality. However, like any piece of equipment, the TDS-3 meter requires regular cleaning and maintenance to ensure accurate and reliable results.

One of the most important reasons to clean and maintain your TDS-3 meter is to prevent contamination. Over time, dirt, debris, and other impurities can build up on the sensor and affect its accuracy. This can lead to false readings and potentially compromise the quality of your water testing results. By regularly cleaning your meter, you can ensure that it continues to provide precise measurements and reliable data.

Another key benefit of cleaning and maintaining your TDS-3 meter is to prolong its lifespan. Like any electronic device, the meter is subject to wear and tear over time. By keeping it clean and well-maintained, you can help prevent damage and extend its longevity. This not only saves you money on replacement costs but also ensures that you can continue to rely on the meter for accurate water testing in the long run.

When it comes to cleaning your TDS-3 meter, it’s important to follow the manufacturer’s instructions carefully. Most meters can be cleaned with a mild detergent and water, using a soft cloth or brush to gently scrub away any buildup. Avoid using harsh chemicals or abrasive materials, as these can damage the sensor and affect its performance. After cleaning, be sure to rinse the meter thoroughly and allow it to dry completely before using it again.

In addition to regular cleaning, it’s also important to calibrate your TDS-3 meter periodically. Calibration ensures that the meter is providing accurate readings and helps maintain its precision over time. Most meters come with calibration solutions that allow you to adjust the settings as needed. By calibrating your meter regularly, you can ensure that it continues to deliver reliable results and remains a valuable tool in your water testing arsenal.

CCT-3300
Constant	10.00cm-1	1.000cm-1	0.100cm-1	0.010cm-1
Conductivity	(500～20,000)	(1.0～2,000)	(0.5～200)	(0.05～18.25)
	μS/cm	μS/cm	μS/cm	MΩ·cm
TDS	(250～10,000)	(0.5～1,000)	(0.25～100)	——
	ppm	ppm	ppm
Medium Temp.	(0～50)℃（Temp. Compensation : NTC10K）
Resolution	Conductivity: 0.01μS/cm；0.01mS/cm
	TDS: 0.01ppm
	Temp.: 0.1℃
Accuracy	Conductivity:1.5%（FS）
	Resistivity: 2.0%（FS）
	TDS:1.5%（FS）
	Temp:±0.5℃
Analog Output	Single isolated(4～20)mA，instrument/transmitter for selection
Control Output	SPDT relay，Load Capacity: AC 230V/50A(Max)
Working Environment	Temp: (0～50)℃；Relative humidity： ≤85%RH(none condensation)
Storage Environment	Temp:(-20～60)℃; Relative humidity ≤85%RH(none condensation)
Power Supply	DC 24V/AC 110V/AC 220V±15%（for selection）
Dimension	48mm×96mm×80mm (H×W×D)
Hole Size	44mm×92mm (H×W)
Installation	Panel mounted, fast installation

To protect your TDS-3 meter when not in use, consider investing in a carrying case. A carrying case provides a convenient and secure way to transport and store your meter, helping to prevent damage and keep it in good condition. Many cases are designed specifically for the TDS-3 meter, with compartments for accessories such as calibration solutions and spare batteries. By using a carrying case, you can ensure that your meter stays safe and protected when not in use.

In conclusion, regular cleaning and maintenance are essential for keeping your HM Digital TDS-3 Handheld TDS Meter in top condition. By preventing contamination, prolonging its lifespan, and calibrating it regularly, you can ensure that the meter continues to provide accurate and reliable water testing results. Investing in a carrying case can also help protect your meter and keep it safe when not in use. With proper care and maintenance, your TDS-3 meter will remain a valuable tool for monitoring water quality and ensuring the safety of your drinking water.