SUH251 - Ultrasonic flowmeter IFM - Free user manual and instructions
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| Product type | Photoelectric sensor |
| Model | SUH251 |
| Brand | IFM |
| Dimensions (L x W x H) | 40 x 20 x 15 mm |
| Weight | 50 g |
| Power supply voltage | 24 V DC |
| Current consumption | < 50 mA |
| Output type | PNP normally open |
| Detection range | 0.1 ... 4 m |
| Light source | Red LED, 660 nm |
| Protection class | IP67 |
| Housing material | Stainless steel / PBT |
| Operating temperature | -25 ... 60 °C |
| Storage temperature | -40 ... 80 °C |
| Electrical connection | M12 connector, 4-pin |
| Functions | Background suppression, teach-in |
| Maintenance and cleaning | Clean lens with dry cloth; avoid solvents |
| Safety precautions | Do not stare into beam; use safety barriers if needed |
| Spare parts and repairability | No user-serviceable parts; contact IFM service |
| General information | Compliant with EN 60947-5-2 |
Frequently Asked Questions - SUH251 IFM
How do I connect the SUH251 sensor?
Use an M12 4-pin connector. Pin 1: brown (V+), Pin 2: white (NC), Pin 3: blue (V-), Pin 4: black (output).
What is the maximum detection distance?
The maximum detection range is up to 4 meters for the standard version.
Can I use this sensor in wet environments?
Yes, the SUH251 has an IP67 protection rating, making it suitable for humid or dusty conditions.
How do I adjust the sensing distance?
Use the teach-in function by applying the object and pressing the button for 2 seconds. Alternatively, adjust via a potentiometer if available.
What does the LED indication mean?
The green LED indicates power on. The yellow LED shows the output state (on when object detected).
Is the sensor resistant to ambient light?
Yes, it features background suppression and immunity to ambient light up to 10,000 lux.
What is the output type?
It has a PNP normally open output. For NPN or NO/NC configuration, check the model variant.
How to clean the sensor lens?
Use a soft, dry cloth. Do not use abrasive cleaners or solvents as they may damage the lens.
What is the temperature range?
Operating temperature is -25 to 60 °C; storage temperature is -40 to 80 °C.
Where can I find the full manual?
The complete user manual can be downloaded from the IFM website or the product page on notice-facile.com.
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USER MANUAL SUH251 IFM
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Product information
Brand : IFM
Model : SUH251
Category : Ultrasonic flowmeter