SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651
SCHMIDT® Flow Sensor SS 20.651

SCHMIDT® Flow Sensor SS 20.651

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Introduction Technical Data

SCHMIDT® Flow Sensor SS 20.651

  • Chamber head (fast response time)
  • Flow and temperature signal
  • Probe length 250 … 1,000 mm
  • Remote sensor (optional)
  • Measuring ranges 0 … 2.5 m/s to 0 … 60 m/s
  • Pulse output
  • Profi-BUS DP-V0 and DeviceNet (optional)
  • Pressure resistant up to 16 bar
  • Temperature range up to +350 °C

In many areas the measurement of flow velocity and/or volume flow at higher temperatures of up to +350 °C is very important in terms of energy efficiency, quantity detection and plant control.

Mechanically rugged, precise and long-term stable measurement values ​​as well as different installation sites

  • Burner control
  • Drying processes
  • Sterile tunnel
  • Combustion air
  • Process technology

SCHMIDT Technology – Simply a question of better measurement

Technical data
Measuring quantity

Standard flow velocity wN based on standard conditions

Temperature of medium TM
Measured medium Clean air or nitrogen, additional gases on request
Measuring range wN 0 … 10 / 20 / 40 / 60 m/s
Lower detection limit wN 0.2 m/s (at TM = 20 °C)
Measuring range TM 0 … +200/+350 °C
 

Measuring accuracy
Standard wN ±(3 % of measured value + [0.4 % of fmr; min. 0.08 m/s])
High precision (optional) wN ±(1 % of measured value + [0.4 % of fmr; min. 0.08 m/s])
Response time (t90) wN 3 s (jump of wN from 0 to 5 m/s in air)
Temperature gradient wN < 8 K/min (at wN = 5 m/s in air)
Temperature TM (wN > 2 m/s) ±2 K (TM = 10 ... 30 °C); ±4 K (remaining measuring range)
Recovery time wN < 10 s (after temperature change of ∆ϑ = 40 K and at wN = 5 m/s in air)
 

Operating temperature
Sensor probe 0 … +200/+350 °C
Electronics 20 … +70 °C
Storage temperature -20 … +85 °C
 

General data
Humidity Measuring mode: Non-condensing (< 95 % RH); high relative air humidity in combination with high temperature can cause measurement deviations
Operating pressure (max.) Atmospheric (700 … 1,300 hPa) / 16 bar (optional; over pressure)
Display 4 x Duo-LEDs (green/red/orange)
Supply voltage 24 V DC ± 20 %
Current consumption Typ. 50 mA (without pulse outputs); max. 250 mA (including signal currents of all outputs)
Start up time Approx. 10 s after switch-on
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 Ω (short-circuit protected)
- Current output (4 … 20 mA): RL ≤ 500 Ω
- Change-over hysteresis: 50 Ω
- CL ≤ 10 nF
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)
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
Fieldbus (optional) Profibus DP / DeviceNet
Electrical connection Plug-in connector M12 (A-coded), male, 8-pole (shielded), screwed
Maximum cable length Voltage interface: 15 m
Current interface / pulse outputs: 100 m
Mounting position Arbitrary (atmospheric; under higher pressure preferred horizontally)
Mounting tolerance ±3° relative to flow direction (unidirectional)
Minimum immersion depth DN25 ( also more, depending on the temperature of medium)
Power-up time 10 s (after switching-on)
Protection type Sensor probe: IP54; enclosure: IP65; electrical connector: IP67 (with correctly attached cable)
Protection class III (SELV) or PELV (EN 50178)
Sensor length 250/400/600/1,000 mm (for both versions: compact and remote probe)
Cable length (remote version) Selectable: 1 … 10 m (step: 1 m)
Weight 550 g max. (400 mm probe length) / 750 g (field bus version)
 

Material
Housing Aluminium, anodised
Sensor head Platinum element (glass-passivated), ceramics
Sensor tube Stainless steel 1.4571
Compression fitting Stainless steel 1.4571 or brass (depending on sensor option)
 

Dowloads
Product brochure (12/2022) Dowload PDF
Instructions for use (547608.02D) Dowload PDF
3D-STP data Dowload