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SF6 Gas Density Relay Calibrator Product Overview

The SF6 Gas Density Relay Calibrator is a portable integrated precision testing device specially developed for on-site calibration of SF6 density relays installed on high-voltage circuit breakers, GIS and switchgear equipment.

It realizes automatic gas filling, pressure regulation, real-time temperature collection and standard pressure conversion under 20°C, accurately verifies the alarm, locking and pressure threshold values of density relays. Equipped with a built-in pressure pump, LCD display and thermal printing module, it needs no external air source, supports one-click automatic testing and generates formal test reports directly.

Housed in a rugged aluminum alloy portable case, the instrument features stable measuring accuracy, simple operation and excellent environmental adaptability. It is widely adopted in power substations, power maintenance departments and electrical testing institutions for regular verification and overhaul of SF6 electrical equipment, ensuring safe and reliable operation of high-voltage power systems.

Product Features

Adopting a 32-bit microprocessor and high-speed signal processing chips manufactured by TI for detection and control, the device boasts high integration. With mechatronic integrated design, it delivers outstanding measurement precision, favorable repeatability and superior operational reliability.
Equipped with a large-screen Chinese LCD display and a jog dial (rotary mouse) human-machine interface, it features intuitive operation and elegant visual interface. All parameters and operating status can be clearly viewed at a glance.
It automatically performs pressure measurement and pressure value conversion under 20°C, realizing dynamic automatic compensation between pressure and temperature. It displays the pressure under ambient temperature, the converted pressure value at 20°C as well as ambient temperature, thoroughly resolving the difficulties encountered in on-site calibration of SF6 gas density relays.
The entire testing process runs automatically without manual intervention, eliminating complicated manual adjustments of the gas circuit.

Technical Specifications

No.	Items	Parameters
1	Operating Voltage	AC 220V, 50Hz
2	Power Consumption	50W
3	Accuracy Class	0.2
4	Pressure Display Resolution	0.001 MPa
5	Pressure Calibration Range	0 ~ 1 MPa
6	Ambient Temperature Display Resolution	0.1°C
7	Ambient Temperature Measuring Range	-20°C ~ 80°C
8	Operating Humidity	≤90% RH (non-condensing)
9	Calibratable Relay Types	Single alarm, single lockout, single alarm & single lockout, single alarm & double lockout
10	Display Screen	320×240 dot matrix monochrome LCD
11	Operation Mode	Rotary jog shuttle (rotary mouse) input
12	Printer Type	High-speed micro printer
13	Printing Mode	Chinese test report formatted printing
14	Storage Capacity	Up to 50 groups of test results
15	Overall Dimensions	Main unit: 365×300×222 mm Accessory case: 400×370×200 mm
16	SF6 Gas Density Display	Ambient actual pressure, equivalent pressure at 20°C
17	Instrument Weight	8 kg

Packing List for SF6 Gas Density Relay Calibrator

No.	Item Description	Specification	Unit	Quantity	Remark
1	SF6 Gas Density Relay Calibrator Host	Standard factory version	PCS	1	Main equipment
2	High-precision Pressure Test Hose	Anti-corrosion, high pressure resistance	PCS	2	Test connecting pipeline
3	Universal Connecting Adapter	Multi-model compatible	SET	1	Including various interface adapters
4	SF6 Filter & Pressure Relief Valve Assembly	Standard matching	SET	1	Gas circuit protection accessory
5	Built-in Rechargeable Battery	Lithium battery pack	PCS	1	Built-in host
6	AC Power Charger & Power Cord	100-240V universal	SET	1	International universal plug
7	USB Data Transmission Cable	Standard configuration	PCS	1	Data export & device upgrade
8	Portable Waterproof Instrument Case	Shockproof & dustproof	PCS	1	Equipment storage & transportation
9	Operation Manual	English Version	BOOK	1	Detailed operation guide
10	Factory Calibration Certificate	Formal test report	COPY	1	Measurement accuracy certification
11	Product Quality Warranty Card	Factory standard	COPY	1	After-sales warranty voucher
12	Software CD/ U Disk	Matching analysis software	PCS	1	PC data analysis software

FAQ: SF6 Gas Density Relay Calibrator

Q1: What is an SF6 Gas Density Relay Calibrator used for?

A: It is a portable high-precision testing instrument dedicated to calibrating all types of SF6 density monitors/density relays installed on GIS, circuit breakers, transformers and switchgear. It automatically measures alarm pressure, lockout pressure, reset pressure and overpressure value, converts on-site ambient pressure to equivalent pressure at 20°C (standard reference temperature), judges relay accuracy, and generates formal test reports for grid acceptance & maintenance records.

Q2: Why must all test results be converted to pressure at 20°C?

A: SF6 gas pressure varies greatly with ambient temperature. 20°C is the globally unified industry reference temperature. Converting all readings to 20°C eliminates temperature interference, ensures consistent & comparable calibration data across different climates, complying with IEC & international power utility standards.

Q3: Which types of density relays can this calibrator test?

A: Compatible with nearly all mainstream brands: Siemens, ABB, Schneider, Areva, and domestic high-voltage density relays. Supports single alarm, single lockout, alarm+lockout dual contacts, dual lockout, overpressure protection contacts, and pointer-type SF6 pressure density gauges. No need to disassemble relays from switchgear for on-site testing.

Q4: What gas can be used for calibration? Must it be pure SF6 gas?

A: No mandatory pure SF6 requirement. Dry Nitrogen (N₂) is the most common & cost-effective choice for routine calibration; pure SF6 is also acceptable. Both inert gases have identical temperature-pressure variation characteristics for calibration purposes.

Q5: What is the recommended filling pressure for the built-in gas storage cylinder? How many tests can one full charge support?

A: Fill the internal tank to max 1.5 MPa. One full inflation can complete 30~60 standard density relay calibration cycles, fully meeting whole-day on-site substation testing needs.

Q6: What is the pressure measuring range & precision grade?

A: Standard range: 0 ~ 1.0 MPa; Pressure resolution: 0.001 MPa.
Optional accuracy grades: 0.25% FS (lab high-precision calibration), 0.4% FS / 0.5% FS (routine field maintenance).

Q7: Why is the pressure adjustment speed limited to ≤0.01 MPa/min during testing?

A: Density relays are precision electromechanical components. Fast inflation/deflation causes contact action hysteresis and reading drift, leading to inaccurate alarm/lockout threshold data. Slow pressure change guarantees contacts respond synchronously, securing reliable calibration results.

Q8: Does the instrument display gauge pressure or absolute pressure? Can it switch between the two?

A: Default display: gauge pressure. The system supports one-click switching to absolute pressure mode for relays marked with absolute pressure parameters; internal software automatically completes unit conversion without manual calculation by operators.

Q9: Can the device work outdoors under different temperatures? What is its working ambient range?

A: Working temperature: -10℃ ~ +60℃, humidity ≤90% RH (non-condensing). Built-in high-precision temperature sensor collects real-time ambient temperature, automatic temperature compensation works normally in hot summer and cold winter outdoor substations.

Q10: Does it support data storage, USB export and on-site printing?

A: Yes. It stores hundreds of groups of historical test records; supports USB flash drive data export for computer archiving. Equipped with a built-in thermal printer to print calibration certificates on site immediately after testing, which can be submitted to power owners for acceptance filing.

Q11: Power supply modes for field operation?

A: Dual power supply:

Built-in rechargeable lithium battery (8~10 hours continuous working for outdoor no-power occasions)
AC 220V mains power supply for indoor laboratory calibration.

Q12: How often should on-site SF6 density relays be calibrated?

A: Per international grid maintenance specifications: routine calibration every 1~3 years. For equipment running in coastal high-humidity, corrosive or severe temperature fluctuation areas, shorten the cycle to 1 year to prevent gas leakage protection failure.

Q13: How frequently does the calibrator itself need official metrological verification?

A: The calibrator shall be sent to accredited metrology institutions for annual calibration (12-month cycle) to maintain measurement accuracy and validity of test reports.

Q14: How to maintain the instrument during long-term idle storage?

Store in dry, ventilated room, avoid vibration, moisture and dust;
Release residual pressure inside the gas pipeline before storage;
Charge the lithium battery every 2 months to prevent battery aging;
Keep all connecting hoses and adapters sealed to avoid air moisture ingress.

Q15: Instrument prompts air leakage during pressure holding test, how to solve?

A: 1. Check all quick connectors, hose joints for loose connection;
2. Replace aging sealing O-rings;
3. Confirm the tested density relay itself has no internal air leakage.

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HF-WC-628 SF6 Gas Density Relay Calibrator