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  1. Home
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  3. Measurement and Analysis
  4. Other measuring instruments
  5. Flow Meter
  6. Flow Switch | Inline Micro Flow Sensor "SDN503 Series"

Flow Switch | Inline Micro Flow Sensor "SDN503 Series"

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SDN 503/1 GA

last updated:Apr 10, 2026

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Can be used at a micro flow rate of 1 to 200 cc/min.

The 【SDN503GA】 is a thermal wire flow sensor that is a combined sensor/converter manufactured by the German company EGE, designed for micro flow applications. It is an inline type with no protrusions inside the pipe, and is available in a lineup with inner diameters ranging from 3.6mm to 20mm. It can detect flows starting from 1cc/min, and an analog output type is also available. *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

    Flow MeterOther measurement, recording and measuring instrumentsSensors
503.1gr.jpg

Flow Switch | Inline Micro Flow Sensor "SDN503 Series"

503.1gr.jpg
503.1gr.jpg sdn503.3.jpg 503.4e.jpg 503.5e.jpg 503.6e.jpg 503.7e.jpg 503.8e.jpg
  • Official page of "SDN 503/1 GA"
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Connection standard: G1/4" (Inner diameter: φ3.6mm) Sensing range (l/min): 0.0001 to 0.5 Operating range (l/min): 0.001 to 0.2 Maximum flow rate (l/h): 100 Output: Relay Contact current (mA): 1000 Contact voltage (V): 30AC/36DC Resistance load (Ω): — Power supply (V): DC24±10% Current consumption (mA): <50 Ambient temperature range (℃): 0 to +60 Fluid temperature range (℃): 0 to +80 Temperature gradient (K/min): 400 Standby time (s): 5 to 15 Response time (s): 0.5 to 1 Maximum operating pressure (MPa): 2 Material: Sensor: SUS316, Housing: PBT Display: LED Protection rating: IP67 Wiring connection: M12 connector *For detailed specifications, please refer to the catalog. Feel free to contact us for inquiries.

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Applications/Examples of results

■Oil compatible ■Food compatible ■Flow detection ●For more details, please contact us.

Line up(7)

Model number overview
SDN 503 GSP Tube connection 4 mm - 0.1 to 500 ml/min - PNP NO
SDN 503 GA Low flow sensor 4 mm - 0.1 to 500 ml/min - 4 to 20 mA
SDN 503 GR Pipe connector 4 mm - 0.1…500 ml/min - Relay
SDN 503/1 GSP G1/4 - 0.1 to 500 ml/min - PNP NO
SDN 503/1 GR G1/4 - 0.1 to 500 ml/min - Relay output
SDN 503/1 GA G1/4 - 0.1 to 500 ml/min - Analog output 4 to 20 mA
SDN 503/2 GSP Tube connection 6 mm - 0.1 to 500 ml/min - PNP NO

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Flow Sensor / Flow Switch | Hot Wire Flow Meter "SN450GA"

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High-Tech Company Profile

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Company information

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Industrial Electrical Equipment

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High Tech was established in 1993 as a specialized trading company dealing with excellent flow meters and flow switches from overseas. We have carefully selected flow meters and flow switches that cater to a wide variety of fluids flowing in diverse situations and have delivered them to many customers. Our ultrasonic flow meters have numerous achievements in public institutions for use in drinking water, agricultural water, and wastewater by providing two types of flow meters based on different principles. Since our establishment, we have a proven track record of over 10,000 reliable and robust flow switches that are integrated into machinery. Additionally, we provide all technical support, including trial operation adjustments, annual inspections, maintenance, and repairs. As a professional group in fluid measurement equipment, we will continue to responsibly deliver excellent products to users.

Product/Service List (40)

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