Flow Speed Relay — SS 20.200
Спецификация SS 20.200
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
The SCHMIDT® SS 20.200 flow velocity relay operates on the principle of a thermal anemometer. This is the same high-tech principle used in flow sensors. The relay can be used in systems with pressures up to 10 bar. However, unlike a sensor, the relay outputs a discrete signal rather than an analog one. The medium temperature is also determined. The SS 20.200 is a temperature-compensated device, so the velocity measurement is not affected by temperature fluctuations.
A special sensitive element technology, providing a wide installation angle range (radial – 360°; axial – 45°), allows for quick and safe relay installation. The relay can be mounted using a flange or compression fitting. The switching point can be set either directly on-site using a potentiometer or in advance according to customer requirements. The relay’s response to crossing the threshold value is optional: the relay can either close or open.
Thanks to the design of the sensitive element, the flow velocity relay can be used in dusty gas environments. If dirt gets on the sensitive element, the user can easily clean it. On request, a version of the relay with a protective coating is also available, making the device resistant to aggressive media such as acetone, sulfuric and hydrochloric acids, as well as many others.
Applications
- Monitoring minimum air flow (ventilation system control)
- Ensuring minimum flow in exhaust systems
- Ensuring sufficient flow values in compressed air systems
- Air supply control in cooling systems (equipment protection)
- Minimum speed control in drying systems
- Filter condition monitoring
- Specifications
- Overall Drawing
- Connection diagram
- Applications
| Technical Specifications SS 20.200 | |
| Unit of measurement | speed (wN), normalized to standard conditions TN = 20 °C, pN = 101325 hPa |
| Measured media | air, nitrogen, other gases on request |
|
Speed measurement range |
0 ... 1 / 10 / 20 m/s |
| Threshold value | from 0.1 m/s up to the upper limit of the range |
| Switching hysteresis | ± 5 % of the threshold value; min 0.1 m/s |
| Threshold value adjustment | potentiometer (270 °), optionally preset |
| Threshold value accuracy (preset) | ± (3 % of measured value + 0.1 m/s) |
| Reproducibility wN | ± ( 2 % of threshold value + 0.1 m/s) |
| Response time t90 wN | 3 s (step from 0 to 5 m/s) |
| Start-up delay | 20 s |
| Temperature gradient wN | < 2 K/min at 5 m/s |
| Operating temperature of sensitive element | -20 ... +85 °C |
| Operating temperature of electronic components | -20 ... + 70 °C |
| Storage temperature | -20 ... +85 °C |
| Material of sensitive element | glass fiber reinforced PBT, anodized aluminum |
| Probe material | stainless steel 1.4571 |
| Housing material | glass fiber reinforced PBT plastic |
| Protective coating material | polyurethane |
| Connecting cable material | PVC |
| Operating humidity | up to 95 % relative humidity (without condensation) |
| Operating pressure | 0...10 bar |
| Indication | green LED: operating status red LED: switching status |
| Power supply | 24 V DC ± 20 % |
| Current consumption | standard < 70 mA |
| Discrete output | semiconductor relay; max. 30 V / 100 mA / 300 mW; RON max = 25 Ohm |
| Electrical connection | cable outlet, 4-pin |
| Permissible cable length | max. 100 m |
| Orientation in space | any |
| Min. immersion depth | 58 mm (< 58 mm on request) |
| Protection class | housing: IP65 / III, sensitive element: IP67 |
| Probe length L | 100 / 200 / 350 / 500 mm |
| Weight | about 100 g (at L = 350 mm) |
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