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Multiplexer with electronics mixed with compact version

Compact version with long distance cables on the RS485
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The stress / strain sensors can be installed vertically or horizontally.To measure the brine pressure they are installed vertically.This solution is more cost effective than the use of load cells.

For short distances up to 20 m up to 16 sensors can be supplied with an electronic multiplexer. The switching speed from one sensor to the next sensor is about 2 seconds. This time is necessary because each sensor has its own temperature measurement.
If fast processes are observed, the sensors must be equipped with separate electronics. These electronics have their own address in the RS485 BUS.

About a USB interface, the data can be retrieved for further processing.
Standard 32 participants on the bus RS485. As an option is an extension to 256 participants possible. The cable lenggth is specified at 1200 m.
Bus nodes are not embeddet. The installation is in a cable duct or on top of the dam.

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Several multiplexer with long distance cables

Stress / strain sensors without sensor electronics can be fitted fix cable with a maximum of 20 m. These cables are connected to the multiplexer with sensor electronics. If the sensors are further away than 20 m cable, for example in a long dam to measure at the sole earth pressure, sensor electronics for embedding in concrete is necessary. This sensor electronics is connected to a long distanze cable to the datalogger.
The sensors with sensor electronics can optionally be delivered as separate version with cable, or as a compact version.
The stress / strain sensors can be manufactured with special length. With their bolt diameter of for example 24 mm, these act as an additional part of the steel reinforcement.

HYDROPOWER DAM STRESS / STRAIN &
REINFORCEMENT MEASUREMENT
USING ULTRASONICS
This document presents a brief description of fastener stress/strain & elongation measurement / PDF