PRODUCTS
McMenon Averaging Pitot Tubes
Monitoring deep foundation pit structure in real time
W
T
he MAPT is a multiport self-averaging flow meter with a design based on the classical pitot tube concept of fluid flow measurement. It produces an averaged differential pressure (DP) signal proportional to the square of the flow rate. The DP output is normally piped to a Differential Pressure transmitter in order to generate an electrical signal proportional to the flow rate. The outer impact tube has a number of pressure sensing holes facing upstream which are positioned at equal annular points in accordance with a log-linear distribution. This pressure is represented at the head as the high pressure component of the DP output. The low pressure component is generated from a single sensing hole located on the downstream side of the
outer impact tube, measuring static pressure. The MAPT is an improvement on the round sensor design due to the unique profiled flats which are positioned around the downstream hole in order to define the separation point at which the flow lines separate as the fluid passes around the outer impact tube. This feature creates a stable pressure area at the downstream pressure sensing hole thereby maintaining a more constant flow coefficient at high velocities enabling a very wide range of flow measurement (turndown).
AMS Instrumentation ams-ic.com.au
48 | Industry Update Issue 126 June / July 2022
ith more large-scale urban developments planned and implemented, the scale and depth requirements of the foundation pit are increasing. Real-time monitoring systems play a significant role during the foundation pit excavation process, providing for the operator real-time data such as the deformation and structural condition of foundation pit, to avoid the occurrence of onsite accidents. When compared with other monitoring methods, ZHYQ real-time monitoring system boasts extremely high accuracy and has the advantage of being more adaptable and less affected by variable weather conditions. Sensor distribution and the choice of system model can be tailored to suit various depths and scale of the foundation pit. All sensors used are recommended to be deployed before construction. The monitoring system layouts relay on site structure information, with all sensors used being deployed before construction. The main suite of foundation pit monitoring includes foundation pit structure support monitoring,
monitoring of surrounding structures – building settlement, tilt and crack monitoring – among other features. The main equipment deployed within the monitoring system includes monocrystalline silicon hydro levelling sensor, inclination sensor, osmometer, crack meter, displacement sensor and bolt pre-tightening force sensor. ZHYQ offers a great range of products that enable a safe and precise monitoring of stress/strain of the foundation pit, settlement, displacement and other parameters which can be tailored to specific working environments and requirements. By using the system monitoring centre, ZHYQ ensures that it implements a unified and centralised management of all front-end sensor equipment, the IOT gateway, data acquisition equipment and the IOT monitoring cloud platform. ZHYQ zhyqsensor.com
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