SediMeter Deployment Methods
Stand-alone: The SediMeter Mod. 3 has a built-in logger and runs on a rechargeable battery. If a cable is connected to a surface buoy, data can be retrieved without removing the instrument from the bottom. It is also possible to put a radio modem on the buoy, so that data can be retrieved over radio without the need to catch the buoy.
Real-time: The SediMeter can be used as a sensor, connected by RS485 to a computer (or other logger) for real-time data monitoring.
Network: More than one instrument can be connected along a cable to a single point or computer. This allows for real-time monitoring of a network of hundreds of instruments.
Telemetry: Our SediLink™ radio modem uses license-free frequencies with ranges of hundreds of meters to several kilometers depending on which plug-in radio is used. The radios allow networking, which can extend the effective range.
With Holder Tube: In the traditional method, a transparent tube is screwed down in the bottom, thus creating a void into which the instrument can be placed. The holder remains in place while servicing or exchanging instrument. The holder and anchor is retrieved at the end of the mission. This method can be used for all models: SM3A, SM3B, and SM3C.
Deployment with a holder tube. The holder tube protects the sensor from scratches. By mounting it so the #37 OBS is above the holder tube, you can get accurate turbidity data from that. The algorithm for determining the sediment level was developed for this mounting method.
Without Holder Tube: The SM3C version has an M6 thread in the bottom end, so it can be attached to the anchor with a threaded rod rather than a holder tube. Attach the parts frist, screw them down, and retrieve the handle.
Deployment without a holder tube. This gives full accuracy from all the turbidity sensors, but exposes the sensor to an increased risk of scratches.
Frame: If you don't need to measure net erosion, but only sedimentation and or near-bed turbidity, you can deploy the instrument from the surface, e.g. attached to a platform of this kind. The surface roughness of the platform can be prepared according to the requirements.
Deployment from the surface. A cable can be pulled to a surface buoy so that data can be retrieved and the battery charged without stopping the measurements. Or, a radio modem can be placed on the buoy and provide continuous data and battery charging.