The shotcrete-concrete stress cells basically consists of a flexible, flat rectangular capsule connected to a specially designed pressure sensor by a 6 mm x 170 mm long stainless steel tube. The sensor offers two variants of pressure cells: • Model ESC-30V with pinching tube • Model ESC-30V-R with re-groutable arrangement (instead of pinching tube). The rigidity of the cell exceeds 50,000 MPa and ensures it will respond immediately and accurately to the onset of increasing concrete stresses. Like any closed hydraulic system, pressure cell is sensitive to temperature effects. Any change in temperature of surrounding concrete can give an unauthentic reading, magnitude of which depends upon elasticity of surrounding concrete and relative coefficient of expansions of materials in contact & filled fluid inside the pressure cell. The sensor has an in-built thermistor to assist in separating these unauthentic temperature effects from actual pressure changes.
Pressure Cell Model ESC-30V
• Sensor type Vibrating ware
• Range (MPa) 1.0, 2.0, 3.5, 5.0, 10.0,20.0, 30.0 specify
• Size (mm2) (pressure pad) 100 x 200, 150 x 250, 200 x 300, 300 x 300
• Accuracy of pressure sensor ± 0.5 % fs standard, ± 0.1 % fs standard
• Temperature limit operational -20 to 80°C
• Over range limit 150 % of range
• Thermistor YSI 44005 or equivalent (3 kOhms at 25°C)
• Enclosure Stainless stee