Specialized in testing the dew point parameters of SF₆ gas applied in high-voltage circuit breakers and GIS combined electrical appliances, this instrument features a color LCD screen that clearly shows comprehensive metrics: dew point, micro moisture (ppm), ambient temperature, ambient humidity, time and date.
Performance Features
Self-calibration: The sensor probe can automatically calibrate the zero point;
Fast and gas-saving: Each SF6 gas dew point measurement takes approximately 5 minutes;
Self-locking connector: Uses original German imported self-locking connectors, ensuring no gas leakage;
Data storage: Can store 200 sets of test data;
Curve function: Large screen displays the dew point measurement process as a curve;
RS232 interface: Can be connected to a PC serial port for data transmission;
Built-in power supply: Built-in 4Ah rechargeable lithium battery, providing 10 hours of continuous operation.
Technical Parameters
| Parameter |
Specification |
| Measurement range |
-80 ℃～+20 ℃ |
| Measurement accuracy |
±1.0℃ (-60℃～20℃) / ±2℃ (-80℃～-60℃) |
| Response time |
63% in 10 seconds, 90% in 240 seconds / 63% in 5 seconds, 90% in 45 seconds |
| Ambient temperature |
-40℃～+60℃ |
| Ambient humidity |
0～100％ RH |
Target Applications and Ideal Users
Unlike general-purpose moisture meters, this SF6 dew point meter is purpose-built for the engineers and service teams who commission, test and maintain SF6-insulated high-voltage equipment. It is the right choice for:
High-voltage switchgear and circuit breaker manufacturers
Factory acceptance and routine dew point testing of SF6 gas-filled breakers before shipment, ensuring every unit leaves the line with verified insulation quality.
GIS substation commissioning teams
On-site dew point verification after gas filling and during the handover of GIS combined electrical appliances, where a stable, low-moisture gas environment is critical.
Power grid maintenance and field service crews
Rapid, on-site moisture checks during preventive maintenance to prevent condensation, dielectric breakdown and internal arcing inside energised breakers.
Electric power research institutes and calibration laboratories
Reference-grade dew point and ppm moisture measurement for research, type testing and periodic instrument calibration programmes.
Transformer and substation EPC contractors
Incoming-material inspection and traceable quality documentation for turnkey high-voltage substation projects.
How It Works
Step 1 Connect and Seal
The original German imported self-locking connector links the probe to the SF6 port of the breaker or GIS unit, keeping the sample gas fully sealed with no leakage during the whole test.
Step 2 Sample and Measure
The sensor stabilises quickly and the color LCD tracks the dew point curve in real time, showing dew point, micro moisture in ppm, ambient temperature and humidity together with the time and date.
Step 3 Read, Store and Transfer
Each measurement completes in about five minutes, can be saved as one of up to 200 test records, and exported to a computer through the RS232 port for reporting.
Frequently Asked Questions
Q1. Which gas does this instrument measure, and what does the LCD show at the same time?
It measures the dew point of SF6 (sulfur hexafluoride) gas used in high-voltage circuit breakers and GIS equipment. The color LCD screen shows dew point, micro moisture in ppm, ambient temperature and ambient humidity, together with the time and date in a single view.
Q2. How long does one measurement take, and how many test records can be stored?
A standard SF6 dew point measurement takes approximately five minutes, and the built-in memory stores up to 200 sets of test data for later review and transfer.
Q3. What are the measurement range and accuracy?
The dew point measurement range is -80 ℃ to +20 ℃, with an accuracy of ±1.0 ℃ over -60 ℃ to 20 ℃ and ±2 ℃ over -80 ℃ to -60 ℃.
Q4. How is the stored data exported to a computer?
An RS232 interface connects the meter to a PC serial port, so stored curves and readings can be transferred for records, reporting and quality documentation.
Q5. How is the unit powered in the field, and will the connector leak?
A built-in 4Ah rechargeable lithium battery provides up to 10 hours of continuous operation, and the original German imported self-locking connector keeps the sample line gas-tight with no leakage.
