SF₆ Gas Density Relay Calibrator

SF₆ Gas Density Relay Calibrator

Product Description

The SF6 Gas Density Relay Calibrator is a professional-grade testing instrument dedicated to the calibration and performance verification of SF6 gas density relays in high-voltage power systems. It serves as a core tool for ensuring the operational safety of SF6-insulated electrical equipment, by validating the accuracy of alarm pressure, locking pressure and return pressure values of density relays.
This device integrates precision pressure control, high-sensitivity signal acquisition and intelligent data processing modules. It supports fully automatic testing workflows, eliminating the need for repeated manual pressure adjustment and significantly improving on-site testing efficiency. With built-in temperature compensation technology, it automatically converts pressure values corresponding to different ambient temperatures, truly restoring the actual gas density state inside the equipment and guaranteeing the credibility of test results.
Encased in a rugged, portable aluminum alloy chassis, the device adapts to harsh on-site conditions such as substations, power plants and industrial sites. It is widely used by power supply bureaus, power maintenance companies, electrical equipment manufacturers and engineering service providers for regular inspection, factory testing and fault troubleshooting of SF6 circuit breakers, gas insulated switchgear (GIS) and other SF6 gas insulated apparatus.
Product Alias

SF6 Density Relay Tester
Portable SF6 Density Monitor Calibrator
SF6 Gas Density Relay Test Set
Automatic SF6 Density Relay Calibration Equipment
GIS SF6 Density Relay Verification Device
Features

Fully Automatic Calibration: Automatically completes pressure regulation, contact signal detection, data calculation and result output, minimizing manual operation and human error.Intelligent Temperature Compensation: Built-in temperature conversion algorithm simulates gas density status under different ambient temperatures, ensuring test accuracy in variable on-site environments.Portable Integrated Design: Housed in a durable aluminum alloy protective case with a compact structure, suitable for outdoor on-site maintenance and mobile testing scenarios.High-Precision Measurement: Adopts high-performance pressure sensors to accurately detect action pressure, return pressure and contact status of density relays.User-Friendly Operation: Equipped with a clear display screen and functional navigation keys, enabling straightforward parameter setting, real-time data viewing and test progress tracking.Strong Compatibility: Compatible with various specifications and brands of SF6 gas density relays, applicable to SF6 circuit breakers, GIS and other SF6-insulated electrical equipment.Stable Field Performance: Delivers reliable operation in complex industrial environments, supporting long-term continuous testing for power maintenance and equipment commissioning.
Product Parameters

Application Scenarios

(Scenarios covered in the images:SF6 density relay calibration in substations, SF6 relay testing on outdoor high-voltage towers, factory acceptance calibration in high-voltage laboratories, SF6 relay verification in power distribution cabinets)

Frequently Asked Questions from Customers

Question 1: No contact action signal detected during calibration

Customer: We are conducting on-site calibration of SF6 density relays for substation GIS equipment. During the automatic test, the pressure has reached the nominal action value and we can hear the relay click, but the instrument always displays "Waiting for contact signal" and finally prompts a test timeout. What could be causing this?
Manufacturer: This situation is quite common in on-site operations. We recommend troubleshooting step by step: First, check whether the contact signal wiring is correct, and confirm that the common terminal, normally open terminal and normally closed terminal of the relay are connected to the corresponding instrument terminals without reverse connection or missing connection. Second, use the buzzer function of a multimeter to check the signal cable and connectors one by one for open circuits or poor contact. Third, confirm that the density relay uses passive dry contacts; if the relay contact is connected to an external control power supply, disconnect the external power supply before testing. In addition, oxidized or ablated relay contacts after long-term use will also lead to signal detection failure; you can try switching to another set of spare contacts for testing. If none of the above steps resolve the issue, please contact us promptly and do not attempt to disassemble the equipment yourself.
Question 2: Large deviation in calibration results

Customer: The instrument can complete the full calibration process, but the measured action pressure value deviates greatly from the relay nameplate value, and the 20°C equivalent pressure results fluctuate obviously in repeated tests. How can this issue be resolved?
Manufacturer: This problem is usually caused by gas circuit leakage, abnormal temperature measurement or pressure sensor drift. The following measures can be taken: First, check the tightness of the entire gas circuit connection. After pressurization, perform a pressure-holding test to check for air leakage at pipe joints, quick connectors and valve ports, and retighten or replace the sealing gasket if leakage is found. Second, ensure the instrument's ambient temperature sensing port is not blocked or close to heat sources, to avoid temperature measurement deviation that affects the accuracy of temperature compensation conversion. Third, perform zero calibration on the pressure sensor before testing, especially after long-term storage or large ambient temperature changes, which can effectively eliminate zero drift. Fourth, wait 3 to 5 minutes after connecting the gas circuit before starting the test, so that the gas temperature inside the relay is consistent with the ambient temperature, to avoid conversion errors caused by uneven gas temperature. If the test object itself has internal air leakage, it will also show unstable pressure; in such cases, it is recommended to first inspect the sealing performance of the density relay.
Question 3: Instrument fails to power on with no screen display

Customer: We connected the device to the AC power supply on site, pressed the power switch, but the screen stays black and the instrument has no response at all. How should we troubleshoot?
Manufacturer: This issue is mostly related to power input or internal protection components. Please follow the steps below to check: First, confirm that the mains socket outputs normal AC 220V, and replace the power cord or socket to rule out poor contact of the power cord. Second, check whether the power fuse on the rear panel is blown; if so, replace it with a fuse of the same specification. Third, make sure the power switch is toggled fully in place and there is no poor contact due to dust or oxidation. If the device still cannot be powered on after the above checks, please do not disassemble it privately and contact our after-sales technical support for further processing.
Question 4: Pressure cannot rise normally or drops rapidly during pressure holding

Customer: During the calibration process, the pressure builds up very slowly and cannot reach the set value; even if it reaches the target pressure, it drops obviously during the holding stage. What is the reason?
Manufacturer: This phenomenon is almost always caused by air leakage in the gas circuit or insufficient air source pressure. You can troubleshoot as follows: First, check whether the pressure of the SF6 gas source or nitrogen source is sufficient, and ensure the output pressure of the pressure reducing valve is higher than the test target pressure. Second, perform a leak check on the entire gas circuit: apply soapy water to all quick connectors, pipe joints and valve ports to see if there are bubbles, retighten the joints or replace the sealing O-rings if leakage is found. Third, check whether the air pipe is bent or blocked, which may cause poor air intake. In addition, if the tested density relay itself has internal leakage, it will also show continuous pressure drop; you can connect a standard sealed joint for comparison test to confirm the fault location.
Question 5: Micro printer does not print or outputs garbled characters

Customer: After the test, we pressed the print button, but the printer has no paper output; sometimes it feeds paper but prints messy and unrecognizable characters. How to solve this?
Manufacturer: This is a common minor fault of the built-in thermal printer, which can be solved by the following operations: First, open the printer compartment and check whether the thermal paper is loaded correctly (the heat-sensitive side faces the print head), and whether the paper roll is exhausted or jammed. Second, confirm that the printer compartment cover is fully closed to ensure the print head is in close contact with the paper. Third, if garbled characters appear, it is usually caused by abnormal communication between the printer and the main control board; you can restart the instrument and try printing again. Do not use ordinary non-thermal printing paper, which will cause no display of content and may damage the print head.
Question 6: USB communication fails and test data cannot be exported

Customer: We connected the instrument to the computer via a USB cable to export test records, but the computer cannot recognize the device and data transmission fails. What should we do?
Manufacturer: Please troubleshoot from the aspects of hardware connection and software settings: First, replace a qualified USB data cable to eliminate the problem of cable damage or poor contact of the interface. Second, confirm that the matching upper computer software has been installed on the computer, and the USB driver is installed correctly without being blocked by anti-virus software. Third, on the instrument side, enter the communication interface and select the correct USB communication mode, and do not perform other operations during data transmission. In addition, if the USB interface is oxidized due to long-term outdoor use, you can gently wipe the metal contacts with anhydrous alcohol and try again after drying.
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