SF6 Density Relay Tester | Detailed introduction of technical principles

The core principle of the SF6 gas density relay calibrator is to simulate changes in gas density within the SF6 equipment chamber by precisely controlling temperature and pressure, thereby verifying the accuracy of the alarm and interlocking contacts of the density relay.

The specific workflow is as follows:
1. Simulation: The calibrator incorporates a precisely temperature-controlled metal chamber (simulating the equipment chamber) and a high-precision pressure sensor. The instrument replicates the pressure-temperature relationship of SF6 gas at different densities by adjusting the pressure within the chamber and maintaining it at different temperatures.

2. Applying Excitation and Monitoring: The density relay to be calibrated is connected to this chamber. The instrument gradually changes the chamber pressure according to a pre-set program and monitors the operational status of each pair of contacts (alarm, interlock) in real time.

3. Calculation and Comparison: Based on the built-in SF6 gas temperature-pressure-density characteristic curve, the instrument automatically converts the measured pressure value at the current temperature into the equivalent density value at a standard reference temperature (typically 20℃). By comparing the "equivalent density value" corresponding to the actual operation of the relay contacts with its calibrated value, the performance of the relay can be determined, thus ensuring the accuracy and reliability of its gas leakage monitoring function. SF6 density relay tester, SF6 density relay calibrator/density monitor, intelligent SF6 gas density relay calibration device pressure calibration range 0-1MPa. The main function of the instrument is to measure the alarm value, lockout value, alarm recovery value, and lockout recovery value of SF₆ gas density relays. The measurement process can perform single-lockout and double-lockout measurements. The instrument also has the function of calibrating pressure gauges at room temperature and 20 degrees Celsius.

1. Simple operation: All testing processes are completed automatically by the instrument without manual intervention, avoiding cumbersome manual gas path adjustment operations.

2. Convenient testing: Portable instrument, equipped with various types of transition connectors, allows for on-site calibration of density relays of most switch types without disassembly.

3. Highly intelligent: The calibration process does not require a constant temperature chamber; SF₆ gas density relays and pressure gauges can be calibrated within any effective temperature range. Utilizing a dynamic pressure and temperature compensation algorithm, the instrument automatically completes pressure measurement and 20°C value conversion, simultaneously displaying the pressure at the measured ambient temperature, the pressure at the ambient temperature and 20°C, and the ambient temperature. This completely solves the problem of difficult on-site calibration of SF₆ gas density relays.

4. Powerful Functions: During SF₆ gas density relay calibration, it simultaneously tests one set of alarm signals and two sets of interlock signals, and has both ambient temperature pressure gauge calibration and 20°C pressure gauge calibration functions.

The instrument's main functions are measuring the alarm value, interlock value, alarm response value, and interlock response value of SF₆ gas density relays. The measurement process can perform single-interlock and double-interlock measurements. The instrument also has ambient temperature pressure gauge calibration and 20°C pressure gauge calibration functions.

5. Safe and Environmentally Friendly: Nitrogen is used instead of SF₆ during the calibration process, ensuring the safety of testing personnel. The testing cost is low, and there is no environmental pollution.

6. User-Friendly Interface: The graphics are clear and aesthetically pleasing. It uses a high-performance rotary mouse for easy operation and includes a high-speed mini thermal printer for instant printing of test data.

7. Data Storage: The instrument can store up to 50 sets of test results and has a power-off data retention function, allowing for easy retrieval and printing of previous test results.

1. Ambient Temperature: -20℃-70℃

2. Relative Humidity: 90%RH

3. Operating Power: AC220V, 50Hz

4. Instrument Power: 50W

5. Instrument Accuracy: 0.2 grade

6. Pressure Display Resolution: 0.1MPa

7. Pressure Calibration Range: 0-1MPa

8. Ambient Temperature Display Resolution: 0.1℃

9. Calibration Objects: Single alarm, single interlock, single alarm single interlock, single alarm double interlock

10. Main Unit Dimensions: 400×320×160 (mm³) Weight: 6.2kg

11. Accessory Box Dimensions: 400×370×200 (mm³) Weight: 4.8kg

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