SCHMIDT® Flow Switch SS 20.200
SCHMIDT® Flow Switch SS 20.200
SCHMIDT® Flow Switch SS 20.200
SCHMIDT® Flow Switch SS 20.200
SCHMIDT® Flow Switch SS 20.200
SCHMIDT® Flow Switch SS 20.200

SCHMIDT® Flow Switch SS 20.200

Thermal Flow Switch for monitoring of flow rate of air and gases.

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Introduction Technical Data

SCHMIDT® Flow Switch SS 20.200

Thermal Flow Switch for monitoring of flow rate of air and gases.

  • Patented sensor head (dumb-bell head):

- Largely independent from flow direction

- Easy to clean (free of undercuts)

- Dirt-resistant

  • Probe length 100 … 500 mm
  • Measuring ranges 0 … 1 m/s to 0 … 20 m/s
  • Visual indication of switching and operating status
  • Potentiometer (pre-programmed as option)
  • Increased resistance to media with optional coating
  • Exhaust air monitoring system
  • Filter monitoring
  • Fume cupboards
  • Clean room and Pharma
  • Ventilation and Air conditioning
  • Semiconductor process equipment

SCHMIDT Technology – Simply a question of better measurement

Technical data
Measuring quantity

Standard flow velocity wN based on standard conditions
Measured medium Air or nitrogen, other gases on request
Measuring range wN 0 … 1 / 2.5 / 10 / 20 m/s
Lower detection limit wN 0.06 m/s
Threshold wN 5 … 95 % of measurement range (min. 0.1 m/s)
Threshold setting wN Potentiometer (270°)>br>Optionally pre-programmed by factory (potentiometer deactivated)
 

Measuring accuracy
Switching hysteresis wN ±5 % of threshold value; min. 0.1 m/s
Setting switching threshold wN Potentiometer (270°); optionally fix pre-programmed
Threshold pre-programmed wN ±3 % of measuring value + 0.1 m/s
Response time (t90) wN 3 s (jump of wN from 0 to 5 m/s in air)
Switch-on delay 20 s
Temperature gradient wN < 2 K/min (at wN = 5 m/s in air)
 

Operating temperature
Sensor probe -20 … +85 °C
Electronics -20 … +70 °C
Storage temperature -20 … +85 °C
 

General data
Humidity Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.) 0 … 10 bar (overpressure)
Display LED green: Operating status;
LED red: Switching status / sensor defective
Supply voltage 24 V DC ± 20 %
Current consumption Typical 40 mA (max. 70 mA, without signal current of relais output)
Switching outputs Semiconductor relais; max. 30 V / 100 mA / 300 mW RON,max = 25 Ω
Electrical connection Non-detachable cable, 4 wires, length 2 m, with ferrules
Maximum cable length 100 m max.
Mounting position Arbitrary
Minimum immersion depth 58 mm (< 58 mm on request)
Protection type Sensor probe: IP67; Enclosure: IP65 (with installed rubber plug)
Protection class III (SELV or PELV)
MTTF value (per 01.01.2011) > 50 years
Sensor length 100/200/350/500 mm
Weight Approx. 100 g (L = 350 mm)

Material
Enclosure PBT (glass-fibre reinforced)
Sensor head PBT (glass-fibre reinforced), stainless steel 1.4571
Sensor tube Stainless steel 1.4571
Protective coating (optional) Polyurethane derivative
Sensor cable PVC
 

Dowloads
Product brochure (11/2023) Dowload PDF
Instructions for use Dowload PDF
3D-STP data Dowload
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  • Flow and temperature signal (optional)
  • Probe length 50 … 500 mm
  • Measuring ranges 0 … 10 m/s to 0 … 60 m/s
  • Temperature range +120 °C