Vaisala 公司推出了一項的創新方案，實現對高壓設備中 SF6 絕緣性能的在線監控。Vaisala 公司的DPT145濕度密度多參數變送器 結合了在線露點監控和壓力檢測功能，堪稱連續實時評估 SF6 絕緣性能的理想工具。
很多開關和斷路器等電力傳輸和配電設備使用六氟化硫（SF6）作為絕緣氣體，以防止關閉開關時產生電弧，保護設備免出故障。Vaisala DPT145 的直接標準化壓力測試功能能夠立即發現任何漏電現象，而其在線露點檢測功能則能夠針對潮氣問題提供早期警告。潮氣能夠影響絕緣氣體的絕緣性能并使故障機率快速升高。
Vaisala DPT145 是目前市場上一種能夠在線同時監控7種參數的電力傳送設備。該設備可以直接檢測露點、壓力和溫度，并計算濃度、標準化壓力、常壓下露點值和PPM值。
由于用一個設備即可監控7種不同參數，線路系統所需的機械連接更少，漏電的可能性也更小了。因為投資更低，安裝成本更少，現場維護需求更少等原因，該設備可全面節省費用，降低消耗。
更重要的是，極其出色的長期穩定性保證了該設備能夠年復一年提供可靠的高質量檢測服務，無須維護校對。另外，由于無須現場取樣檢測，所以 SF6 氣體不會泄露到空氣中，因此在線監控方式也環保效應。
測量參數： 露點:-50...+30°C、壓力:0...10bar和溫度-40...+80°C
計算參數： SF6密度、標準壓力、常壓露點和ppm
技術參數 |
測量參數 | ||
| Dew point Pressure, absolute Temperature | -50 ... +30 °C (-58 ... +86 °F) 1 ... 10 bar (14.5 ... 145 psi) -40 ... +80 °C (-40 ... +176 °F) | |
參數計算 | ||
| Pressure, normalized to 20 °C (68 °F) | 1 ... 12 bar (14.5…174 psi) | |
| SF6 or SF6/N2 mixture density ppm moisture, by volume Dewpoint, converted to atmospheric pressure | 0...100 kg/m3 40 ... 40 000 ppm -65 … +30 °C (-85 ... +86 °F) | |
性能 | ||
| Dew point accuracy Dewpoint stability Pressure accuracy at 23 °C (73.4 °F) Pressure temperature dependence | ±3 °C (±5.4 °F) typical drift < 2 °C (3.6 °F) /5 years ±0.4 %FS ±0.1 %FS/10 °C (18 °F) | |
| Pressure stability Temperature accuracy 0 ... 40 °C (+32 ... +104 °F) -40...80 °C (-40 ... +176 °F) | typical drift < 1 %FS /5 years ±0.5 °C (± 0.9 °F) ±1 °C (± 1.8 °F) | |
| Density accuracy (pure SF6, 1 ... 10 bara) 0 ... 40 °C (+32 ... +104 °F) | ±1 %FS | |
| -40 ... +60 °C (-40 ... +140 °F) PPM accuracy, typical (5...1000 ppm, 7 bar) | ±2.2 %FS ±( 7 ppm + 15% of reading) | |
| Sensor response time: Pressure response time Dew point response time* 63% [90%] at 20°C and 1 bar -50 -> -10 °C Tdf -10 -> -50 °C Tdf | < 1 s 5 s [ 10 s] 10 s [ 2.5 min] | |
| | * system equilibrium related response time is typically longer | |
| | 操作環境 | |
| Operating temperature of electronics Operating Pressure Relative humidity Measured gases | -40 … +60 °C (-40 ... +140 °F) 0 … 50 bar (0…725 psi) 0...100 % SF6, SF6/N2 mixture | |
| | 輸出 | |
| Digital output Connector | RS-485, non-isolated, Vaisala protocol 4-pin M8 | |
| | 其他 | |
| | Sensor Operating voltage | Vaisala MPS1 multiparameter sensor 15 ... 28 VDC |
| | 20 ... 28 VDC in cold temperatures (-40 ... -20 °C (-40 ... -4 °F)) | |
| | Supply current, during normal measurement during self-diagnostics Housing material Housing classification | 20 mA max. 300 mA pulsed AISI316L IP65 (NEMA4) |
| | Weather shield to be used for continuous outdoor installations | |
| | Storage temperature range transmitter only shipment package Mechanical connection | -40 … +80 °C (-40 ... +176 °F) -20 … +80 °C (-4 ... +176 °F) DILO DN20, ABB Malmkvist, or Alstom G1/2” compatible connector |
| | Every connection is helium leak tested at the factory | |
| | Dimensional drawings Weight (with DILO adapter) | See the document B211165EN-A 765 g (27.0 oz) |
| | Complies with EMC standard EN61326-1, Electrical equipment for measurement, control and laboratory use - EMC requirements; | |
| | Industrial environment, Tested levels EN/IEC 61000-4-2, Electrostatic Discharge EN/IEC 61000-4-3, RF field immunity EN/IEC 61000-4-4, Electric Fast Transient EN/IEC 61000-4-5, Surge EN/IEC 61000-4-6, Conducted RF Immunity Mechanical vibration EN/IEC 60068-2-6, Fc Sinusoidial vibration | |
