Dual-wavelength NDIR · Remote Monitoring
Fixed SF6 Room Monitor
Fixed monitor for continuous SF6, O2, temperature and humidity monitoring in GIS and switchgear rooms.
Dual-wave NDIR
SF6 Sensing
4 Parameters
SF6 · O2 · T · RH
RS-485
Wired Communication
Zigbee
Wireless Communication
Applications
- Continuous SF6 and oxygen monitoring in GIS rooms, switchgear rooms and other indoor areas where SF6-filled equipment is installed
- Fixed environmental monitoring and alarm for locations where SF6 leakage or oxygen depletion needs to be detected continuously
Special Features
- Dual-wavelength NDIR sensing for continuous SF6 concentration monitoring
- Simultaneous monitoring of SF6, oxygen, temperature and humidity
- Adjustable alarm thresholds with external sound and light alarm output
- RS-485 and Zigbee communication for remote data and alarm-status transmission
- Local OLED display with on-site or remote calibration support
Product overview
Description
Continuous room monitoring
The LL34 Fixed SF6 Room Monitor is designed for continuous environmental monitoring in GIS rooms, switchgear rooms and other areas where SF6-filled equipment is installed. It monitors SF6 concentration, oxygen, temperature and humidity at the same time, giving operators a clear view of room conditions without relying only on periodic manual inspection.
Dual-wavelength NDIR sensing is used for SF6 measurement, while the local OLED display shows current readings directly at the monitoring point.
Alarm and remote monitoring
Alarm thresholds can be set according to the monitoring requirement. When an abnormal SF6 concentration or oxygen condition is detected, the LL34 can activate external sound and light alarms to provide an immediate warning.
RS-485 and Zigbee communication allow measurement data, settings and relay status to be transmitted to a host or monitoring system. The monitor also supports local or remote calibration, making it suitable for fixed multi-point monitoring installations.
Technical Specifications
Core technical data for LL34 Fixed SF6 Room Monitor.
| Parameter | Specification |
|---|---|
| Sulfur hexafluoride (SF6) gas — SF6 Measuring range | (0~1500) µmol/mol |
| Sulfur hexafluoride (SF6) gas — Maximum permissible errors | ±5% (displayed values) |
| Sulfur hexafluoride (SF6) gas — Repeatability | ≤3% |
| Sulfur hexafluoride (SF6) gas — Response time | <60 s |
| Oxygen(O2) — Measuring range | (0~-25) % |
| Oxygen(O2) — Maximum permissible errors | ±0.5% (volume ratio) |
| Oxygen(O2) — Repeatablity | ≤1% |
| Oxygen(O2) — Response time | <60 s |
| Temperature Measurement Parameters — Measuring range | (-40~100) ℃ |
| Temperature Measurement Parameters — Maximum permissible errors | ±2 ℃ |
| Humidity measurement parameters — Measuring range | (0-99)% RH |
| Humidity measurement parameters — Maximum permissible errors | ±5% RH |
| Other parameters — Alarm output | To realize alarm function, it needs to be connected to the SPDT electronic relay, and the effective alarm of the transmitter is 1 point. Alarm relay contact capacity: resistive load: 5 A@250 VAC, 5 A@30 VDC inductive load: 50 VA |
| Other parameters — Input voltage | 24 VDC±15 % |
| Other parameters — Power | 3 W/channel |
| Other parameters — Insulation resistance | ≥100 MΩ |
| Other parameters — Dielectic withstand voltage | 1500V |
| Other parameters — Dimensions | 174 mm*110mm*66 mm (L*W*H) |
| Other parameters — Weight | 0.6 kg |
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View ProductFrequently Asked Questions
Common technical and operational questions about the LL34.
Can the LL34 locate the exact SF6 leak point?
No. The LL34 is designed for continuous room monitoring and alarm rather than pinpoint leak location. If an abnormal SF6 concentration is detected, a portable leak detector can then be used to locate the leakage point on the equipment.
Why does the LL34 monitor oxygen as well as SF6?
The LL34 monitors both SF6 concentration and oxygen condition in the room. This allows the system to provide a broader indication of the indoor environment when SF6 leakage or oxygen depletion is a concern.
Can the alarm levels be adjusted for different sites?
Yes. Alarm thresholds can be set according to the monitoring requirement, allowing the LL34 to be adapted to different GIS rooms, switchgear rooms and operating procedures.
Can the LL34 connect to a central monitoring system?
Yes. The monitor supports RS-485 and Zigbee communication for transmitting measurement data, settings and relay status to a host or monitoring system.
Can the LL34 be used as part of a multi-point room monitoring system?
Yes. The LL34 is suitable for fixed monitoring at multiple locations within an SF6 equipment area. Communication interfaces allow individual monitoring points to be connected to a central system for remote supervision.