Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651 - Flow Sensors for Burners and Furnace Construction
SCHMIDT® Flow Sensor SS 20.651 - Flow Sensors for Burners and Furnace Construction. Measuring quantity Standard flow velocity wN based on standard conditions 1) | Me
Product Overview
The SCHMIDT® Flow Sensor SS 20.651 is part of the SCHMIDT Flow Sensors for Burners and Furnace Construction line. Chamber head (fast response time)Flow and temperature signalProbe length 250 ... 1,000 mmRemote sensor (optional)Measuring ranges 0 ... 2.5 m/s to 0 ... We supply genuine, brand-new SCHMIDT Technology products with selection support, technical documentation and stable supply.
Specifications
| 测量量 / Measuring quantity | Standard flow velocity wN based on standard conditions 1) | Medium temperature TM技术参数 |
|---|---|
| 被测介质 / Measured medium | Clean air or nitrogen, other gases upon request技术参数 |
| 量程 / Measuring range wN | 0 ... 10 / 20 / 40 / 60 m/s技术参数 |
| 最低检出限 / Lower detection limit wN | 0.2 m/s (at TM = 20 °C)技术参数 |
| 介质温度量程 / Measuring range TM | 0 ... +200/+350 °C技术参数 |
| 传感器头部 / Sensor head | 0 ... +200/+350 °C工作温度 |
| Electronics | -20 ... +70 °C工作温度 |
| 存储温度 / Storage temperature | -20 ... +85 °C工作温度 |
| 外壳 / Housing | Aluminium, anodised材质 |
| 传感器管 / Sensor tube | Stainless steel 1.4571材质 |
| 传感器头部 / Sensor head | Platinum element (glass-passivated), ceramics材质 |
| 卡套接头 / Compression fitting | Stainless steel 1.4571 or brass (depending on sensor option)材质 |
| 测量精度（标准） / Standard wN | ±(3 % of measured value + [0.4 % of fmr; min. 0.08 m/s]) 2)测量精度 |
| 测量精度（高精度可选） / High precision (optional) wN | ±(1 % of measured value + [0.4 % of fmr; min. 0.08 m/s]) 2)测量精度 |
| 响应时间 / Response time (t90) wN | 3 s (jump of wN from 0 to 5 m/s in air)测量精度 |
| 温度梯度 / Temperature gradient wN | < 8 K/min (at wN = 5 m/s in air)测量精度 |
| Temperature TM (wN > 2 m/s) | ±2 K (TM = 10 ... 30 °C); ±4 K (remaining measuring range)测量精度 |
| Recovery time wN | < 10 s (after temperature change of ∆ϑ = 40 K and at wN = 5 m/s in air)测量精度 |
| 湿度 / Humidity | Measuring mode: Non-condensing (< 95 % RH); high relative air humidity in combination with high temperature can cause measurement deviations通用参数 |
| 工作压力 / Operating pressure (max.) | Atmospheric (700 ... 1,300 hPa) / 16 bar (optional; over pressure)通用参数 |
| 显示 / Display | 4 x Duo-LEDs (green/red/orange)通用参数 |
| 供电电压 / Supply voltage | 24 V DC ± 20 %通用参数 |
| 电流消耗 / Current consumption | Typ. 50 mA (without pulse outputs); max. 250 mA (including signal currents of all outputs)通用参数 |
| Start up time | Approx. 10 s after switch-on通用参数 |
| 模拟输出 / Analog outputs | Type: Auto U / I) | wN, TM | 0 ... 10 V / 4 ... 20 mA (switching of signal characteristic depends on RL) | -Voltage output (0 ... 10 V): RL >= 550 ohm (short-circuit protected) | - Current output (4 ... 20 mA): RL <= 500 ohm | - Change-over hysteresis: 50 ohm | - CL <= 10 nF通用参数 |
| 脉冲输出：信号形式 / Pulse outputs: Signalization | Standard: Frequency f ~ wN | f = 0 ... fmax | fmax = 100 Hz (option: fmax = 10 ... 99 Hz) | Optional: Pulse quantity: | 1 pulse/1 m3; 1 pulse/0.1 m3; 1 pulse/0.01 m3 (max. 100 pulses/s)通用参数 |
| 脉冲输出：技术 / Pulse outputs: Technology | 1. Highside-driver (PNP, open collector) at protected supply voltage; not galvanically isolated) | Short-circuit protected (analog): 100 mA | High level: > supply voltage - 3 V | Leckage current: IOFF < 10 µA | 2. Semiconductor relay; output galvanically isolated | Output voltage/current: Max. 30 V / 50 mA通用参数 |
| Fieldbus (optional) | Profibus DP / DeviceNet通用参数 |
| 电气连接 / Electrical connection | Plug-in connector M12 (A-coded), male, 8-pole (shielded), screwed通用参数 |
| 最大电缆长度 / Maximum cable length | Voltage interface / current interface / pulse outputs: 100 m | Voltage mode: Use AGND and RL >= 10 k (mass offset)通用参数 |
| 安装位置 / Mounting position | Arbitrary (atmospheric; under higher pressure preferred horizontally)通用参数 |
| 安装公差 / Mounting tolerance | ±3° relative to flow direction (unidirectional)通用参数 |
| 最小插入深度 / Minimum immersion depth | DN25 ( also more, depending on the temperature of medium)通用参数 |
| Power-up time | 10 s (after switching-on)通用参数 |
| 防护等级 / Protection type | Sensor probe: IP54; enclosure: IP65; electrical connector: IP67 (with correctly attached cable)通用参数 |
| 防护等级 / Protection class | III (SELV or PELV)通用参数 |
| 探头长度 / Probe length | 250/400/600/1,000 mm (for both versions: compact and remote probe)通用参数 |
| Cable length (remote version) | Selectable: 1 ... 10 m (step: 1 m)通用参数 |
| 重量 / Weight | 550 g max. (400 mm probe length) / 750 g (field bus version)通用参数 |
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