Automatic SF6 Gas Density Relay Calibrator | VS-9606

Products Details

VS-9606 Automatic SF6 Density Relay Calibrator is designed for on-site verification of SF6 gas density relays installed on high-voltage switchgear, gas-insulated substations (GIS), and SF6 circuit breakers. Within these systems, the density relay serves as a crucial monitoring component that supervises internal gas density and provides alarm or lockout signals whenever gas conditions drop outside specified operational limits. If a relay operates inaccurately due to contact aging, mechanical sticking, or temperature compensation drift, the switchgear may issue false alarms or fail to respond to genuine low-density conditions.

Engineered with an embedded microprocessor, high-precision pressure sensing, temperature measurement, and automatic calculation software, the instrument evaluates relay action points under actual field temperature conditions. Because SF6 gas pressure varies with ambient temperature, direct pressure readings at site temperatures cannot be evaluated against the relay scale without proper compensation. The VS-9606 automatically records pressure and temperature at the precise moment a relay contact changes state and converts the reading to the equivalent pressure at 20°C, enabling test results to be evaluated against factory setting values under a unified reference standard.

The instrument supports complete verification of alarm value, alarm reset value, lockout value, lockout reset value, lockout 2, and overpressure contacts. Beyond relay verification, it can calibrate density gauges and pressure gauges by establishing calibration points and evaluating indicated values against the reference pressure. Supporting both relative and absolute pressure testing, the unit is fully compatible with diverse relay marking conventions used across different global manufacturers.

Designed for efficient field operation, the VS-9606 features a 7-inch true-color LCD display, built-in micro-printer, USB 2.0 communication interface, internal rechargeable battery, pressure and gas temperature calibration routines, historical data storage, and an adjustable backlight. Its integrated intelligent gas charging system allows multiple consecutive tests after a single gas-filling operation, minimizing reliance on heavy external gas cylinders during routine site work. Furthermore, the system permits using SF6, N₂, Air, O₂, or CO₂ as alternative test gases based on site requirements, helping reduce SF6 gas consumption during field calibration.

During operation, technicians connect to relay signal terminals using color-coded test leads: red clips for alarm contacts, yellow clips for lockout contacts, and green clips for lockout 2 or overpressure contacts. Gas connections are secured via the supplied hoses and transition adapters. As pressure increases or decreases smoothly, the device detects contact transitions, records pressure and temperature, executes the 20°C conversion, and stores or prints the results.

Safety mechanisms are fully integrated for demanding field environments. Signal sampling inputs feature intelligent voltage protection, ensuring that accidental contact between sampling clips and 220 V control power will not damage the calibrator. Operators should disconnect relay control power prior to wiring and adhere to standard substation safety protocols. The calibrator is ideally suited for preventive maintenance and factory inspection of SF6 electrical equipment, particularly where DL/T596-1996 preventive testing standards are specified.

Specifications

System Specifications
Item	Specification
Product model	VS-9606
Product type	SF6 density relay calibrator
Control system	Embedded microprocessor
Applicable equipment	SF6 density relay, density gauge, pressure gauge
Test pressure type	Absolute pressure and relative pressure
Data storage	Not less than 400 records
Communication interface	USB 2.0
Printing method	Built-in needle-type micro printer
Display	7-inch true-color LCD display

 

Pressure Specifications
Item	Specification
Pressure measurement range	0 to 1.0 MPa
Calibration pressure range	0 to 1.0 MPa standard pressure at 20°C
Pressure resolution	0.0001 MPa
Accuracy	Class 0.2; customizable according to user requirement

 

Temperature Specifications
Item	Specification
Temperature measurement range	-50째C to +200째C
System thermometer range	-50째C to +200째C
Temperature resolution	0.1째C

 

Power Supply
Item	Specification
Power supply mode	AC/DC dual-use
AC input	AC 220 V ±10%, 50 Hz
Battery	Built-in rechargeable battery
Continuous operation	Several hours; manual FAQ states more than 5 hours after full charge
Charging protection	Built-in charger, charging indicator, overcharge protection

 

Environmental Conditions
Item	Specification
Operating ambient temperature	-20°C to +60°C
Relative humidity	Not more than 93% at 25°C

 

Dimensions
Item	Specification
Overall dimensions	478 × 357 × 222 mm

 

Transition Adapters
No.	Adapter / Applicable Equipment
1	Taikai, M27 × 1.5
2	ABB, M30 × 2
3	Small Nuo, M26 × 1.5
4	Large Nuo, M45 × 2
5	Gas cylinder connector, M16 × 1.5
6	Density gauge connector, M20 × 1.5
7	Pingkai male connector
8	Pingkai female connector
9	Large Xikai connector
10	Small Xikai connector

 

Standard Accessories
Item	Quantity
SF6 gas density relay calibrator	1 set
Density relay connecting pipe	1 pc
Booster connecting pipe	1 pc
Gas storage cylinder filling pipe	1 pc
Calibration point sampling leads	6 pcs
Seven-core socket cable	1 pc
Pressure reducing valve	1 pc
Transition adapter set	1 set, model specified by user
Certificate	1 copy
Factory inspection record	1 copy
User manual	1 copy

 

Standard Accessories
Item	Quantity
SF6 gas density relay calibrator	1 set
Density relay connecting pipe	1 pc
Booster connecting pipe	1 pc
Gas storage cylinder filling pipe	1 pc
Calibration point sampling leads	6 pcs
Seven-core socket cable	1 pc
Pressure reducing valve	1 pc
Transition adapter set	1 set, model specified by user
Certificate	1 copy
Factory inspection record	1 copy
User manual	1 copy

Working Principle

The VS-9606 operates on the mathematical relationship between gas pressure, temperature, and gas density within a sealed volume. For SF6 density relay verification, reference values are standardly expressed as equivalent pressure at 20°C. Because field pressure changes dynamically with ambient temperature, the instrument records both pressure and temperature at the exact moment a relay contact acts or resets, automatically converting measured values to equivalent 20°C standard pressure.

For rising-pressure tests, gas is charged slowly and uniformly into the relay or gauge under test. When the relay triggers a lockout reset, alarm reset, or overpressure signal, the instrument captures the pressure and temperature. For falling-pressure tests, gas is released slowly and uniformly; when the relay triggers overpressure reset, alarm, or lockout signals, values are recorded and converted in the same manner.

Features

• Supports automatic calibration of SF6 gas density relays.
• Supports density gauge and pressure gauge verification.
• Measures alarm, lockout, lockout 2, overpressure, action, and reset values.
• Measures pressure under actual ambient temperature conditions.
• Provides automatic conversion to equivalent standard pressure at 20°C.
• Supports relative pressure and absolute pressure testing.
• Displays gas source pressure during calibration.
• Provides pressure and gas temperature calibration functions.
• Automatically records relay contact action during rising or falling pressure.
• Calculates pressure deviation for density gauge or pressure gauge calibration points.
• Includes a 7-inch true-color LCD display.
• Includes built-in micro printer for test reports.
• Includes USB 2.0 interface for data communication.
• Provides internal rechargeable battery operation and AC power supply.
• Detects field relay contact signals through color-coded sampling leads.
• Includes intelligent voltage protection on sampling input points.
• Provides historical data storage of not less than 400 records.
• Supports adjustable display backlight for different field environments.
• Includes built-in intelligent gas charging system.
• Supports use of SF6, N2, Air, O2, or CO2 as test gas according to test requirements.

Testing Procedure

1. Check the battery level before field testing. Charge the instrument if the battery indication is low.
2. Disconnect the control power of the SF6 density relay before connecting the test leads.
3. Select the correct transition adapter according to the switchgear or relay connection.
4. Connect the signal sampling leads to the relay terminals. Red is used for alarm contacts, yellow for lockout contacts, and green for lockout 2 or overpressure contacts.
5. Connect the gas path using the supplied hose and adapter.
6. Enter the calibration interface and select the relay or gauge test mode.
7. Set the required calibration points or relay contact type.
8. Start the pressure test and allow pressure to rise or fall slowly.
9. Review the converted 20°C standard pressure values after each contact action.
10. Store or print the test result as required.

Operation Workflow

• For SF6 Density Relay Testing: The operator prepares the device, isolates the relay control circuit, connects sampling leads and gas hoses, selects test mode, and executes automatic verification. The calibrator automatically identifies relay action and reset points.

• For Density / Pressure Gauge Testing: The operator connects the gauge, configures calibration points, applies pressure, and compares gauge indications against instrument reference values. Observed deviations determine whether gauge setting points read high or low.

Application Scenarios

• Power Utilities: Used during preventive maintenance of SF6 circuit breakers, GIS bays, and high-voltage switchgear to confirm alarm and lockout contacts operate at correct pressure thresholds.

• Transformer Manufacturers: Applied during factory inspection of SF6 monitoring devices on gas-insulated components.

• Power Plants: Supports scheduled relay testing across switchyards and auxiliary power systems to mitigate risks of false alarms or missed lockouts.

• Railways: Assists traction substation teams in testing compact high-voltage switchgear relays during outage windows.

• Industrial Plants: Used in mining, petrochemical, and steel facilities to verify switchgear performance beyond visual pressure indications.

• Universities: Applied in high-voltage laboratories to teach gas pressure compensation, relay testing, and preventive routines.

• Testing Laboratories: Used for relay calibration, switchgear acceptance testing, and third-party maintenance verification.

• Cable Maintenance: Utilized by field teams working with GIS cable terminations and SF6 switchgear before energization or post-repair.

Applications

• SF6 density relay calibration for GIS equipment.
• SF6 circuit breaker density relay testing.
• Alarm contact action value verification.
• Lockout contact action value verification.
• Lockout reset value testing.
• Overpressure contact testing.
• Density gauge calibration.
• Pressure gauge calibration.
• 20°C standard pressure conversion.
• Relative pressure testing.
• Absolute pressure testing.
• Preventive maintenance of SF6 switchgear.
• Factory inspection of SF6 monitoring devices.
• Field troubleshooting of abnormal density relay signals.
• Historical test record storage and report printing.

Customer Case

• Industry: Power utility substation maintenance department.

• Problem: A maintenance crew needed to verify several SF6 density relays on high-voltage switchgear during a scheduled outage. Relays in service for several years were suspected of contact delays or temperature compensation drift. A portable device was required to test alarm/lockout contacts on site and convert values to 20°C standard pressure.

• Testing Process: Technicians isolated relay control power, selected transition adapters, connected contact leads and gas lines, and used the VS-9606 to modulate pressure gradually. At each contact action/reset point, the instrument logged pressure and temperature, converting values to 20°C standard pressure. Results were stored and printed for documentation.

• Result: Clear action and reset values were obtained for each unit. Relays meeting tolerances were returned to service, while units showing abnormal contact behavior were flagged for replacement.

• Benefits: The utility eliminated manual calculation errors, improved record consistency, and completed verification within the planned outage window. On-board printing and storage ensured complete maintenance traceability.

FAQ

Q1: What is the working principle of the VS-9606 SF6 Density Relay Calibrator?

The instrument measures gas pressure and temperature when an SF6 density relay contact acts or resets. It then converts the measured value to equivalent standard pressure at 20°C for direct comparison against relay setting values.

Q2: What equipment can the VS-9606 test?

It tests SF6 gas density relays, density gauges, and pressure gauges, supporting alarm, lockout, lockout 2, overpressure, action, and reset point verification.

Q3: What is the pressure measurement range?

The measurement and calibration range is 0 to 1.0 MPa (converted to standard pressure at 20°C).

Q4: What is the accuracy of the instrument?

The calibrator features Class 0.2 accuracy, with custom accuracy options available based on specific requirements.

Q5: Can the instrument test absolute pressure relays?

Yes, it supports both absolute and relative pressure testing. When testing absolute pressure relays, operators should confirm proper conversion parameters before testing.

Q6: What gases can be used for testing?

The instrument supports SF6, N₂, Air, O₂, and CO₂. Using alternative test gases helps reduce SF6 consumption during routine calibration.

Q7: How should the instrument be maintained?

Keep the internal battery charged before long-term storage. Inspect transition adapters, hoses, and leads prior to field work, and replace printer paper or ribbon as needed. Integrated pressure and temperature calibration routines are available to ensure ongoing measurement reliability.

Q8: Which standard is mentioned for regular SF6 density relay testing?

The manual cites DL/T596-1996 (Preventive Test Code for Electric Power Equipment), which mandates regular calibration of SF6 gas density relays on power switches.

Weshine Advantages

Weshine Electric provides professional electrical testing solutions for utilities, industrial plants, laboratories, and field service contractors. For specialized maintenance, operators can also integrate our comprehensive SF6 gas analyzer equipment alongside density testing routines to ensure complete gas quality assessment.

Weshine emphasizes practical field operation, stable measurement performance, full accessory kits, and traceable documentation. Every calibrator ships with factory inspection records and operational guidance. Weshine offers full technical support for model selection, adapter matching, and customized requirements when site conditions vary from standard configurations. For global clients, Weshine provides continuous pre- and post-delivery communication to support successful equipment deployment in commissioning, preventive maintenance, and routine electrical testing.