SCHMIDT® Flow Sensor SS 20.261

The generation of compressed air is a cost-intensive process. Therefore it is worthwhile to optimize compressed air networks.

SCHMIDT® Flow Sensor SS 20.261

The generation of compressed air is a cost-intensive process. Therefore it is worthwhile to optimize compressed air networks.

  • Chamber head (fast response time)
  • Flow and temperature signal
  • Probe length 200 … 350 mm
  • Measuring ranges 0 … 40 m/s to 0 … 90 m/s
  • Pressure resistantup to 10 bar

The precise and continuous analysis of the actual consumption of a compressed air system is the basis for its optimization. To this end, the operator must know the actual volume flows of the system, the distribution of compressed air in the network and ultimately also the volume flows during idle times - the leakage quantity. This data can be used to determine exactly where and which optimisation measures must be carried out.

The solution is the use of volume flow sensors.

All necessary data will be collected, like leakage rates, consumption and distribution to the various points of use (cost allocation). Thus the maintenance intervals can be also flexibly adapted to the actual system states.

  • Packaging machines
  • Injection molding machines
  • Textile machines
  • Pneumatic conveying systems
  • Painting
  • Installation of air tools
  • Insulating materials

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 … 40 / 60 / 90 m/s
Lower detection limit wN 0.2 m/s
Measuring range TM -20 … + 85 °C
 

Measuring accuracy

Standard wN ±(5 % of measured value + 0.4 % of fmr)
High precision (optional) wN ±(3 % of measured value + 0.4 % of fmr)
Response time (t90) wN 3 s (jump from 0 to 5 m/s)
Temperature gradient wN ≤ 8 K/min (at wN = 5 m/s in air)
TM (wN > 2 m/s) ±1 K (0 … 40 °C); ±2 K (in remaining measuring range)
 

Operating temperature

Sensor probe -20 … +85 °C
Electronics 0 … +70 °C
 

General data

Humidity Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.) 10 bar (overpressure)
Display LED green: Operating state
LED red (flashing): Sensor defective
Supply voltage 24 V DC ± 10 %
Current consumption Typ. < 40 mA, max. 60 mA
Analog outputs (wN and TM) 4 … 20 mA (RL ≤ 300 Ω, CL ≤ 10 nF), short circuit protected
Electrical connection Non-detachable cable , 4 x 0,14 mm2, length 5 m, with ferrules
Maximum cable length 100 m
Mounting position Arbitrary (except in case of a downward
flow and < 2 m/s at the same time)
Mounting tolerance ±3° relative to flow direction (unidirectional)
Protection type Sensor probe: IP66; enclosure: IP54
Protection class III (SELV) or PELV (EN 50178)
Sensor length 200/350 mm
Weight 250 g (max.; L = 350 mm)
 

Material

Enclosure PBT (glass-fibre reinforced)
Sensor head Platinum element (glass passivated); PPO/PA
Sensor tube Stainless steel 1.4571
Compression fitting Brass (G½) / stainless steel 1.4305 (R½) (order options)
Sensor cable PVC
 

Dowloads

Product brochure (04/2024) Dowload PDF
Instructions for use (527254.02F) Dowload PDF
3D-STP data Dowload PDF
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Standard volume flow and medium temperature at a glance!