Chilled Dew Point Measurement System
- Wrindu
- Shanghai, China
- about 10 working days
- 1000 set/month
- RDLD-703,RDLD-704
The RDLD-704 SF6 Chilled Dew Point Measurement System uses imported sensors for accurate dew point measurement. It supports real-time data monitoring and curve display, with practical power management for field use. The system is built to work reliably even in harsh testing environments.
Product Description
The RDLD-704 SF6 Chilled Dew Point Measurement System uses high-precision imported sensors to provide stable and accurate dew point readings. It supports real-time measurement and displays test results through graphical curves, while its power management system helps keep the instrument running smoothly during field testing. Other built-in functions include time settings, file management, and test data retrieval.
The RDLD-704 combines advanced sensor technology with modern digital processing to make daily operation simple and convenient. A high-performance microprocessor and ARM-based technology are used as the core of the system. This design gives the instrument good stability and allows it to work in a variety of demanding field conditions. Whether used for routine inspection or testing in harsh environments, the system is designed to provide dependable measurement performance.
Product Features
1. Easy-to-Use Touchscreen – Simple controls make the instrument convenient to operate in the field.
2. Improved Resistance to Pollution – Designed to maintain stable performance in dusty or contaminated working conditions.
3. Built-In High-Capacity Battery – Provides longer operating time for field testing without frequent recharging.
4. High Sensitivity and Stable Performance – Delivers clear and dependable readings during measurement.
5. Lower Gas Consumption and Faster Testing – Helps reduce SF6 usage while shortening the measurement time.
6. Stable Performance Over Time – Provides good repeatability for regular and repeated measurements.
7. Multiple Measurement Functions – Measures gas pressure, flow rate, temperature, and humidity in addition to dew point.
8. Easy Data Management – Test records can be saved, viewed, retrieved, and printed when needed.
9. Automatic 20°C Conversion – Converts the measured result automatically to the standard micro-water value at 20°C.
10. 5-Inch Full-Color Display – Shows real-time readings and measurement curves on a clear color screen.
11. Sensor Protection Knob – Helps protect the sensor during operation and extends its service life.
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Product Sprcification and Technical Parameters
No. | Name | parameters |
1 | Dew point range | ―80℃ ～ +20℃ |
2 | Dew point accuracy | ±0.5℃ |
3 | Resolution | Dew point: 0.1℃ Micro water: 0.1ppm（100ppm~1000ppm） 0.01ppm(10ppm~100ppm) |
4 | Repeatability | ±0.1℃ |
5 | Intake port | Imported quick self-locking interface |
6 | Cooling mode: | air cooling |
7 | Pressure measurement | 0 ～ 1.0MPa |
8 | Flow measurement | 0 ～ 1.0L/min |
9 | Working environment | temperature: -10 ～ +50℃ Humidity: 0 ～ 90%RH |
10 | Working supply power | lithium battery power supply, AC / DC dual-use, automatic switching, overcharge and over discharge protection function |
11 | Dimension | 330×255×165（mm） |
12 | Weight | 5.05kg |
How Does the RDLD-704 Measure SF6 Dew Point?
The RDLD-704 measures the moisture content of SF6 gas by detecting its dew point. During the test, a small amount of SF6 is introduced into the measuring system through the quick self-locking inlet. The sensor detects the moisture condition of the gas and converts the result into a dew point reading.
The instrument can measure dew point from −80°C to +20°C, with an accuracy of ±0.5°C and a resolution of 0.1°C. It also provides micro-water readings, allowing technicians to check the moisture level of SF6 gas more directly.
Gas pressure and flow can be monitored during the measurement. This helps the operator keep the sampling conditions within a suitable range and reduces problems caused by unstable gas flow.
Why Is Dew Point Measurement Important for SF6 Equipment?
Moisture in SF6 insulation systems can affect the condition of the gas and the internal insulation environment of electrical equipment. For this reason, dew point measurement is commonly used when checking SF6-filled equipment during installation, commissioning, maintenance, and routine inspection.
A low dew point indicates that the gas contains less moisture. If the measured value is higher than expected, technicians may need to check for moisture ingress, incomplete drying, gas handling problems, or other sources of contamination.
The actual acceptance limit should be determined according to the equipment manufacturer's requirements, applicable standards, and the specific maintenance procedure. The RDLD-704 provides the measurement data; the final technical decision should be made with reference to the applicable test criteria.
What Can the RDLD-704 Measure?
The instrument is designed to provide several parameters during SF6 testing rather than only displaying a dew point value.
| Measurement | Range / Function |
|---|---|
| Dew point | −80°C to +20°C |
| Dew point accuracy | ±0.5°C |
| Dew point resolution | 0.1°C |
| Micro-water resolution | 0.01 ppm / 0.1 ppm, depending on range |
| Gas pressure | 0–1.0 MPa |
| Gas flow | 0–1.0 L/min |
| Ambient temperature | −10°C to +50°C working environment |
| Humidity | 0–90% RH |
These readings give field technicians more information when checking SF6 gas conditions and evaluating whether the sampling process is stable.
Where Can the RDLD-704 Be Used?
The RDLD-704 is intended for field measurement of SF6 gas in electrical equipment and related maintenance work. Typical applications include SF6 circuit breaker maintenance, GIS and gas-insulated switchgear inspection, SF6 gas quality checks, Equipment commissioning, Preventive maintenance, Post-maintenance inspection, SF6 gas recovery and refilling work and Troubleshooting of abnormal moisture readings.
Its built-in battery, compact dimensions of 330 × 255 × 165 mm, and weight of approximately 5.05 kg make it suitable for technicians who need to move the instrument between testing points.
How Should SF6 Dew Point Testing Be Carried Out?
Before measurement, the operator should check the sampling hose, inlet connection, and instrument condition. The sampling connection should be clean and properly sealed to prevent outside air or moisture from entering the test path.
A typical field procedure is:
Check the instrument and sampling accessories before starting.
Connect the SF6 sampling line to the equipment under test.
Confirm that the connection is secure and free from leakage.
Start the instrument and allow the measurement system to initialize.
Adjust the gas flow according to the testing requirements.
Monitor the dew point, pressure, and flow readings.
Wait for the reading to become stable before recording the result.
Save the measurement data for future reference.
Disconnect the sampling line after testing and follow the required SF6 handling procedure.
The exact sampling and acceptance procedure should follow the equipment manufacturer's instructions and the applicable testing standard.
How Can Stable Measurement Results Be Obtained?
Dew point measurements can be affected by sampling conditions. A poorly sealed connection, excessive gas flow, contaminated tubing, or moisture remaining in the sampling line may affect the result.
For more consistent measurements, technicians should pay attention to several points:
Keep the sampling line clean and dry.
Check all connections before measurement.
Avoid unnecessary exposure of the sampling system to ambient air.
Maintain a suitable and stable gas flow.
Allow sufficient time for the sensor reading to stabilize.
Compare repeated measurements when a result appears abnormal.
Keep records of previous test results for trend analysis.
The RDLD-704 provides a repeatability of ±0.1°C, which helps technicians compare repeated measurements under similar conditions.
How Does the RDLD-704 Help With Field Testing?
Field testing often requires the instrument to be used away from a laboratory environment. The RDLD-704 is designed with this type of work in mind.
Its lithium battery allows independent operation, while the AC/DC dual-power design provides another power option when mains power is available. Automatic switching and battery overcharge and over-discharge protection are also included.
The 5-inch full-color touchscreen displays measurement values and curves in real time. Test records can be stored and retrieved directly from the instrument, reducing the need to manually copy every reading during field work.
How Should the RDLD-704 Be Maintained?
Regular care helps keep the measurement system in good working condition. After testing, the sampling connections should be protected from dust and moisture. The instrument should be stored in a clean and dry location when it is not in use.
The sensor and gas path should also be handled according to the manufacturer's maintenance instructions. Avoid unnecessary exposure of the sensor to contaminated gas or humid ambient air.
For repeated field use, it is useful to keep measurement records and compare the results over time. Changes in dew point readings can provide additional information during routine equipment maintenance.
Why Choose Wrindu for SF6 Testing Equipment?
Wrindu is a China-based manufacturer and supplier of electrical testing equipment, with experience in the design, development, and production of high-voltage and power testing instruments.
The company provides testing equipment for applications including SF6 gas testing, transformer testing, cable testing, insulation testing, circuit breaker testing, CT/PT testing, and partial discharge measurement.
Wrindu supports OEM, ODM, and customized testing solutions for different applications. Product development and manufacturing are supported by an established quality management system, while technical guidance is available for equipment selection, operation, and testing applications.
For customers purchasing the RDLD-704, Wrindu can provide product documentation, operating guidance, and technical support to help users apply the instrument correctly in field testing.
