Trafag,8774,SF6氣體密度變送器,SF6混合氣特高壓氣體密度傳感器

Trafag,8774,SF6氣體密度變送器,SF6混合氣特高壓氣體密度傳感器

基本技術(shù)參數(shù):

適用于SF6氣體或是其它氣體

SF6氣體密度變送器應(yīng)用于高壓及中壓開關(guān)柜

SF6氣體密度變送器測(cè)量原理:石英晶振測(cè)量

變送器測(cè)量精度:1.0

溫度信號(hào)精度:環(huán)境溫度下±2°C,在 -40...85°C: ±3°C

變送器輸出:數(shù)字信號(hào)或是模擬電流

Trafag,8774,SF6氣體密度變送器,SF6混合氣特高壓氣體密度傳感器

• Continuous measurement數(shù)字信號(hào)可連續(xù)輸出無飄移
• Protection IP65防護(hù)等級(jí)IP65
• No maintenance無需維護(hù)
• Compact緊湊型設(shè)計(jì)
• Vibration and shock-proof防振動(dòng)和抗沖擊
• Suitable for outdoor usage適合戶外使用
• Response time <10ms與密度變化時(shí)響應(yīng)時(shí)間<10ms

Application
High voltage switchgear

Medium voltage switchgear

Main characteristics

Density Sensor for SF6 and other gases
? Principle: Oscillating quartz measurement
? Measuring range: 0...60 kg SF6 /m3
? Output
Digital: current pulses onto supply current
Analogue: current loop
? Accuracy: ±1.8% FS max.
±1.0% FS typ.

The Trafag gas density sensor type 8774 was specifically designed for surveying insulation gases.
The gas density is measured with an oscillating quartz with excellent long term stability. The constant resonant frequency of a quartz oscillator
under vacuum is compared with the resonant frequency of an identical quartz situated in the sample gas. The difference in the resonant frequency is proportional to the density of the sample gas. The measured density is proportional to the pulse frequency or to the mA output.

With the digital variant additionally the temperature can be measured over the pulse width of the frequency signal.

Main features

Continuous measurement of density and temperature
? long term drift free output signal
? Protection IP65
? No maintenance
? Compact
? Vibration and shock proof
? Suitable for outdoor usage
? Response time <10ms (with density changes)

Ordering information

Specifications

Main characteristics

Principle: Oscillating quartz measurement
Measuring range: 0...60 kg SF6 /m3
10 ... 253 Hz
Output
Digital: current pulses onto supply current
Analogue: current loop

Accuracy
Accuracy: ±1.8% FS max.
±1.0% FS typ.
Repeatability: ±0.2% of measured value
Temperature signal
at ambient temperature ±2°C
at -40...85°C: ±3°C

Electrical data
Output signal
Digital: current pulses
Density signal: pulse frequency
10...292 Hz (range 0...60 kg SF6/m3)
Output signal
Analogue: 6.5...20 mA
Density signal: current loop
10...275 Hz (range0...56.1 kg SF6/m3)
Supply voltage
Digital output: 2-wire, 10...20 VDC
3-wire, 14...28 VDC
Ground: via gas connection of sensor
Supply voltage
Analogue output: 2-wire, 10...32 VDC
Reaction time: <10 ms (with density changes)
Temperature signal: Pulse width 2188 ... 2565 ... 2975μs
(=Temp. -40...23...85°C)

Environmental conditions
Operating temperature: -40... +70°C
Media temperature: -40... +70°C
Storage temp.: -40... +85°C
Operating pressure: max. 15 bar
Humidity: suitable for outdoor usage;
55°C and 98% relative
Protection: 1)IP65
Vibration: 15 g (max. 6 mm),(5...2000 Hz)
Shock: 100g/ 6 ms

EMC Protection
ESD: 8kV/15kV air EN/IEC 61000-4-2
Radiated Immunity: 10V/m, 80...2700Hz
EN/IEC 61000-4-3
Burst: 4kV EN/IEC 61000-4-4
Surge: 2kV (42 Ω) EN/IEC 61000-4-5
Conducted Immunity: 10V, EN/IEC 61000-4-6

Mechanical data
Material:
Pressure connection: 1.4435 (AISI316L)
Tube 1.4301
O-Ring: EPDM
Male electrical plug: see ordering info.
Screwed cable gland: brass nickel plated
Mounting: any position
Weight: approx. 200...400 g

Functional diagram

Digital 2- or 3 wire Analogue 2-wire

Output Signal analogue

Output Signal digital

without pulses typical 2 mA

Dimensions

Adapters

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