Installing SR50A - RWS200

RWS200 Installation Manual
Product status
Document code
M211608EN
Revision
AA
ft:locale
en-US
Product
RWS200
Document type
User guide
  • 4‑mm Allen key for the support arm extension
  • 5‑mm Allen key
  • 7‑mm wrench
WARNING Do not perform installation or maintenance procedures when there is a risk of thunderstorm or lightning activity in the area.

In RWS200, SR50A is used as a water level sensor or a snow depth sensor.

Mount a support arm to a suitable place depending on the intended use, and mount the sensor on the support arm.

For the most reliable measurements:

  • Mount the sensor at least 50 cm (20 in) above the highest expected target level, but not too far away from it. For example, if the snow level is not likely to exceed 1.25 m (4 ft 1 in), mount the sensor to approximately 2 m (6 ft 7 in).

  • Install the sensor in a 90° angle to the intended target surface. Make sure that no object or reflection interferes with the 30° angle beam.

    SR50A beam angle clearance
  • If you have two SR50A sensors, install them far enough from each other so that their beams do not interfere with each other.

If you need to have more clearance for the beam, you can install an extension (ASM212380) to the support arm. The extension lengthens the support arm by 223 mm (8.78 in). With the extension, you can mount SR50A approximately 4 m (13 1 in) from the ground to get a larger target surface. The sensor installation procedure is the same as without the extension.

CAUTION Do not mount the sensor too far from the target surface. The further the sensor is from the target, the more the absolute error increases. The maximum measuring distance is 10 m (32 ft 10 in).
WARNING A long cable between units (sensors, transmitters, power supplies, and displays) can cause a lethal lightning-induced current surge. Always ground the enclosure to a suitable grounded location with a short, low-resistance cable.
SR50A installation accessories
1
Screw M4×0.8 (2 pcs), included with the sensor
2
Mounting kit (ASM210958)
2.1
Fixture plate
2.2
Hex screw M6×16 DIN912 A4 (2 pcs)
2.3
Spring washer B6 DIN127 A4 (2 pcs)
2.4
Flat washer A6.4 DIN125 A4 (2 pcs)
Depending on the mast, you can install the sensor in one of the following ways:
  • Attach the sensor to the fixture plate and the whole assembly to the support arm.
  • Attach the fixture plate to the support arm and the sensor to the fixture plate.
To prevent corrosion, oxidation, and seizing, use a non‑conductive, non‑water‑soluble, non‑silicone‑based grease, such as ceramic or Teflon paste, between different kinds of metal.
  1. If needed, install the extension at the end of the support arm.
    1
    Extension (ASM212380)
    2
    Hex screw M5×16 DIN912 A4 (1 pc)
    3
    Spring washer B5 DIN127 A4 (1 pc)
    4
    Flat washer A5.3 DIN125 A4 (1 pc)
    5
    Button head hex screw M6×16 ISO7380 A4 (1 pc)
    6
    Spring washer M6 DIN127 A4 (1 pc)
    7
    Flat washer A6.4 DIN125 A4 (1 pc)
  2. Connect the sensor cable to the sensor.
  3. Attach the sensor to the fixture plate.
    1
    Fixture plate
    2
    Screw M4×0.8 (2 pcs)
  4. Attach the fixture plate to the support arm. Tightening torque 5 Nm.
    1
    Hex screw M6×16 DIN912 A4 (2 pcs)
    2
    Spring washer B6 DIN127 A4 (2 pcs)
    3
    Flat washer A6.4 DIN125 A4 (2 pcs)
  5. Measure the distance of the outer edge of the transducer housing from the ground.

    The sensor installation height is measured from the grill. Add 8 mm (0.3 in) to the distance between the outer edge and the ground.

    1
    Outer edge of the transducer housing
    2
    Sensor grill
  6. Tie the cable to the support arm with cable ties.
  7. Connect the sensor cable.
Write down the sensor installation place and height. This is needed for the metadata in the Web UI.