SF6 Leak Detection Solutions
Meet and comply with environmental regulations
High Sensitivity for Leak Detection using PAS
Photoacoustic Spectroscopy (PAS) gas instruments are field proven in several applications and were perfected for SF6 leak detection. The PAS technique is highly accurate, stable, provides a direct measurement indepen-dent of background, and does not require any carrier gas or consumables.
In a PAS instrument, the SF6 gas is irradiated by modulated infrared light of a pre-selected wavelength to provide high selectivity and accuracy. The gas molecules absorb some of the light energy and converts it into an acoustic signal which is detected by sensitive microphones with very stable signal.
PAS Technology Features
SF6 Filled Equipment Leak Detection
Sulfur Hexafluoride (SF6) is one of the most potent greenhouse gases with a Global Warming Potential of more than 22,000 times than that of CO2. Over the past decades, SF6 has been commonly used as insulation gas in medium and high voltage switch gears. Today, the power utility industry uses roughly 80% of all SF6 produced worldwide.
The system measures the total concentration of the SF6 gas in an enclosed area where the switch gear (or other SF6 filled equipment) is installed to determine leak rate. By accurately measuring leak rate, utilities can improve operational quality while decreasing costs and emissions.
Simple to Use
Simply turn on the leak detector and press the “Measure” button. That’s really all that you need to know. The monitor’s extended self-test routines maintain the reliability of the results, which are available online or can be downloaded as required. The only maintenance task necessary is changing the air filter. However, it is recom-mended that you calibrate the unit annually.
A 24 channel multiplexer is available that can sequen-tially draw gas samples from up to 24 locations. Integrating seamlessly with the SF6 Leak Detector. This multipoint sampler extends its area monitoring capability.
It enables a good spatial resolution in the leak detec-tion with a good flexibility in the choice of the sampling locations.
Ease of use, and long-term stability are required for the mostly unmanned GIS substations. With its low detection limit (6 ppb), and its accuracy over a high dynamic range, the permanent monitoring solution from LumaSense enables early leak detection in comparison with monthly visual checks of density gauges.
The SF6 Leak Detector can complimentarily meet the health & safety requirements in enclosed areas where SF6 leaks may occur. Sampling points can indeed be located in low lying and confined areas where SF6 would build up over its MAC level (1000 ppm) or even up to an asphyxia-tion risk level. Alarm relays can be set up on two SF6 concentra-tion levels to alert on a potential leak or to warn of a hazardous situation.
Schematic of the SF6 multipoint monitoring solution: A local computer (or remote computer) is connected to the SF6 Gas Monitor, it synchronizes the monitoring and the sampling devices. The same application software operates on either of the computers which enable online supervision with the OPC interface allowing remote access to the same data. The two (2) Alarm relays can be connected to a local warning device (bell, buzzer, or alarm light) or be connected to a local RTU device for remote alarm signals.
LumaSense is the industry leader in the use of Photoacoustic Spectroscopy and Non-Dispersive Infrared technologies and has deployed thousands of systems in the field. With over 40 years of experience, LumaSense is redefining the way gases are measured.
|Detection Principle||Photoacoustic Infrared Spectroscopy|
|Detection Limit||6 ppb (standard)|
|Response Time||27s (Standard Mode); 13s (Fast Mode)|
|Dynamic Range||5 - 50,000 ppb (50 ppm) Standard; 1 - 4,000 ppm Optional|
|Repeatability||1% of Measured Value|
|Zero Drift||± Detection Limit per Quarter|
|Influence of temperature||±10% of Detection Limit per ˚C|
|Influence of presure||±0.5% of Detection Limit per mbar|
|Range Drift||±2.5% of Measured Value per Quarter|
|Influence of temperature||±0.3% of Measured Value per ˚C|
|Influence of pressure||-0.01% of Measured Value per mbar|
SF6 Detector: 175 mm (H) x 483 mm (W) x 375mm (D)
|Weight||SF6 Detector: 14 kg (30.81lbs)
1409 with 6/12/24 channels:
6.6/7.9/10.3 kg (14.6/17.4/22/7 lbs)
|Power Supply||100-240V (50-60 Hz)|
|Power Consumption||35 VA (SF6 detector + sampler)|
|Communication with local PC||RS232, USB, and TCP-IP|
|Relays||2 Alarm Relays (Visual/Audio) with User-Defined Levels. Max 25 VDC and 100 mA|
|Data storage||Capacity for 22 days|
|Safety||EN/IEC 61010-1 3rd edition|
EN 61326-1:2006: Class B, Basic and Industrial locations. Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements
|Environment||Operation: 5 to 40°C; Storage: -25 to 55°C|
|WL0950-003||S232 Interface Cable|
|EB6000||External pump (small), 230V|
|EB6004||External pump (small), 115V|
|EB6002||External pump (large), 230V|
|EB6003||External pump (large), 115V|