SCHMIDT® Flow Sensor SS 20.250
SCHMIDT® Flow Sensor SS 20.250
SCHMIDT® Flow Sensor SS 20.250
SCHMIDT® Flow Sensor SS 20.250
SCHMIDT® Flow Sensor SS 20.250
SCHMIDT® Flow Sensor SS 20.250

SCHMIDT® Flow Sensor SS 20.250

The smallest all-rounder – universal and powerful

Request a quote
Introduction Technical Data

SCHMIDT® Flow Sensor SS 20.250

The smallest all-rounder – universal and powerful

  • Patented sensor head (dumb-bell head):

- Largely independent from flow direction

- Easy to clean (free of undercuts)

- Dirt-resistant

  • Flow and medium temperature signal
  • Probe length 300 … 500 mm
  • Measuring ranges 0 … 1 m/s to 0 … 20 m/s, special measuring range
  • Optional coated (not for Hygienic Design version)
  • Hygienic Design version optional

In many applications, the direct measurement of flow velocity or volume flow in air and gases is the ideal solution.

Due to high demands of modern control technology, the flow sensor has to detect precisely and fast an extremely wide measuring range from "almost zero" up to the maximum value.

For clean room applications also available as SS 20.250 Hygienic Design (order option):

  • Smooth surface (free of undercuts) prevents product or dirt residues
  • Corrosion resistant (stainless steel V4A)
  • Easy to clean
  • Resistant to all commercially available cleaning agents
  • Easy to remove for calibration due to plug-in connection

- Sensor with 1.5 m Hygienic Design cable and plug

- Additional 10 m Hygienic Design cable with socket included

  • Ventilation and air conditioning
  • Clean room and pharma
  • Monitoring of FFUs
  • Monitoring of laminar flow in cleanrooms

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 … 1 / 10 / 20 m/s;
Special measuring range inbetween 1 … 20 m/s (steps of 0.1 m/s)
Measuring range TM -20 … +70 °C
Lower detection limit wN 0.06 m/s
 

Measuring accuracy
Standard wN ±(5 % of measured value + [0.4 % of fmr; min 0.02 m/s])
High precision (optional) wN ±(3 % of measured value + [0.4 % of fmr; min 0.02 m/s])
Response time (t90) wN 3 s (jump from 0 to 5 m/s in air)
Temperature gradient wN < 2 K/min (at wN = 5 m/s in air)
TM (for wN > 1 m/s) ±1 K (10 … 30 °C); ±2 K (remaining measuring range)
 

Operating temperature
Sensor / electronics -20 … +70 °C
Storage temperature -30 … +85 °C
 

General data
Humidity Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.) Atmospheric (700 … 1,300 hPa)
Display Dual-LED:
- Green: Status
- Red (flashing): Sensor defective
Supply voltage 24 V DC ± 10 %
Current consumption Typical < 60 mA, max. 100 mA
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
Voltage output: RL ≥ 500 Ω
Current output: RL ≤ 500 Ω
Hysteresis: 50 Ω
Electrical connection Non-detachable cable, 5 x 0,25 mm2
Standard: Length 2 m or selectable (3 … 100 m; steps of 1 m), with ferrules
Hygienic Design Option: 1.5 m, M12 plug (male, A-coded, 5 pole);
Additional content of delivery: Cable 10 m, M12 bushing (female, A-coded, 5 pole)
Maximum cable length Voltage interface: 15 m
Current interface: 100 m
Mounting position Arbitrary
Minimum immersion depth 58 mm (< 58 mm upon request)
Protection type IP65
Protection class III (SELV) or PELV (EN 50178)
Probe length 300/500 mm
Weight 200 g max
 

Material
Sensor head PBT (glass-fibre reinforced), stainless steel 1.4571
Sensor tube Stainless steel 1.4571
Protective coating (optional) Polyurethan / parylene (coating not available for Hygienic Design version)
Sensor cable Standard: PUR, halogen-free
Hygienic Design Option: PP-EPDM, halogen-free
 

Dowloads
Product brochure (04/2024) Dowload PDF
Instructions for Use (529070.02D) Dowload PDF
3D-STP data Dowload PDF
Product brochure Hygenic Design (10/2022) Dowload PDF
Addition to manual of SS 20.250 – option Hygienic Design Cable Dowload PDF
Related products
SCHMIDT® Laminar-Flow Sensor SS 20.715 LED
SCHMIDT® Laminar-Flow Sensor SS 20.715 LED

Robust validation of laminar flow

SCHMIDT® Flow Sensor SS 23.400 ATEX
SCHMIDT® Flow Sensor SS 23.400 ATEX

Thermal flow sensor for uni- or bidirectional measurement of flow rate of air and gases with simultaneous detection of the flow direction in an explosive atmosphere (Zone 2).

SCHMIDT® Flow Sensor SS 20.515 LED
SCHMIDT® Flow Sensor SS 20.515 LED

Thermal flow sensor with integrated electronics for measuring flow velocity of air, especially designed for monitoring laminar flow of air in cleanroom facilities.