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0102030405

Huazheng Manufacture HZSF-702 High Precision Portable Dew Point Tester

SF6 gas is widely used as an insulating and arc-quenching medium in high-voltage electrical equipment, such as circuit breakers and gas-insulated switchgear (GIS). The SF6 Dew Point Tester is essential for monitoring the moisture content in these systems, ensuring their safe and reliable operation. Additionally, the tester is used in laboratories and research institutions to analyze the quality of SF6 gas and develop new applications.
In summary, the SF6 Dew Point Tester is a vital tool for ensuring the quality and safety of SF6 gas in various applications. Its accurate measurement, wide range, fast testing, and portability make it indispensable in the power industry and other fields where SF6 gas is used.

Transformer On-load Tap-changer Tester (6)

I.Technical Characteristics And Parameters

Features
Smart calibration	The sensor probe can automatically calibrate the zero point to ensure the readiness for each measurement;
Quick and gas-saving	After turning on the machine and entering the measurement state, the dew point measurement time for each SF6 air barrier is about 5 minutes;
Safe and reliable	It adopts self-locking joints imported from Germany, which are safe, reliable and airtight;
Mass storage	Adopting a large-capacity data storage design, it can store up to 250 sets of test data;
High definition display	Color screen directly display dew point, moisture, temperature, humidity, time, date and dew point curve;
Moving measurement	Built-in large capacity rechargeable lithium battery, a full charge can work for 10 hours；
Accurate measurement	The temperature compensation function is added to ensure the accuracy of the measurement results under various temperature conditions.
Local calibration	This machine comes with calibration function, do not need to connect the computer to complete the data calibration.
Technical parameter
dew-point	Measuring range	－60℃～+ 20℃
	measurement accuracy	±1℃
ambient temperature	－40℃～＋80℃
environment humidity	0～100％ RH
Display device	4.3-inch color touch screen
power supply	AC 220V；Built-in rechargeable battery: can be used for more than 10 hours on a single charge
weight	4.5Kg
size	300 mm×150 mm×300mm
Operating temperature	－30℃～＋60℃

Instrument Panel Description

1、front panel

Note: Press the bracket adjustment buttons on both sides at the same time to adjust the angle of the bracket.

2、rear panel

Note: This model can be equipped with a printer.

Measurement Methods

1.Connect SF6 Devices

.Connect the threaded end of the measuring pipe to the switch joint and tighten it with a wrench.

.Close the needle valve at the other end of the measuring pipe.

.Insert one end of the quick connector on the measuring pipe into the air inlet of the instrument.

.Insert one end of the exhaust pipe into the exhaust port on the back of the instrument and place the other end into a trench or window.

.Finally, connect the switch connector to the SF6 electrical equipment measurement interface and tighten with a wrench.

2.Initialization

Turn on the power switch of the instrument. The instrument will enter the initialization self-calibration process. After calibration, it will automatically enter the measurement page.

3.Check Battery

It is recommended to use DC power for this instrument. When using DC power, check the battery power displayed in the upper right corner. If the power indicator turns red, turn off the instrument and charge it before continuing to use it.

4.Start Measuring

.Fully open the flow valve on the front panel of the dew point meter.

.Slowly adjust the flow to about 0.5 L/min by adjusting the needle valve on the measuring pipe to start measuring the SF6 dew point.

.The first device will take 5 to 10 minutes to measure, and each subsequent device will take 3 to 5 minutes.

5.Storing Data

After the measurement is completed, the data can be saved in the instrument. Press the "OK" key to bring up the operation menu. For specific operation methods, refer to the next section.

6.Measure Other Equipment

.After completing the measurement of one piece of equipment, close the needle valve on the measuring pipe.

.Remove the switch connector along with the measuring pipe from the SF6 electrical device.

.If you need to continue measuring other devices, do not turn off the instrument power. Follow the steps above to continue measuring the next device.

7.Measurement Ended

After all equipment measurements are completed, turn off the instrument power.

Precautions

1.Placement
Place the instrument in a safe location to prevent it from falling and severe vibrations.
2.Gas Measurement
Do not measure corrosive or flammable gases.
3.Charging
Charge the instrument in a timely manner before use.
4.Charging Procedure
To charge the instrument, simply connect the power cord to a 220V socket. There is no need to turn on the power switch; the instrument will charge automatically. The charging time typically takes more than 10 hours.
5.Flow Adjustment
Before measuring, open the valve on the flow meter first, and then adjust the flow through the valve on the pipeline. Failure to do so may cause the gas in the internal pipeline of the instrument to generate pressure. Measuring under pressure can result in significantly higher readings.

Appendix：(Requirements for measuring moisture content of SF6 circuit breakers)

Test content	standard （μl/l, 20℃）
When the SF6 circuit breaker leaves the factory and is overhauled (before the overall installation), the moisture values of the breaking unit and the pillar unit should be measured separately.	≤150
During handover, the moisture value of the circuit breaker is measured through the inflatable interface at the bottom of the pillar.	≤150
During operation, the moisture value of the circuit breaker is measured through the inflatable interface at the bottom of the pillar. The test cycle is specified in the "pre-test procedures".	≤200
During operation, if necessary (the breaking unit leaks, the breaking unit is disassembled), the water content of the breaking gas chamber of the SF6 circuit breaker should be measured separately from the self-sealing joint in the header.	≤300