The Vibrating Wire Embedment Jointmeter is designed to monitor movement of joints in mass-concrete structures.
The jointmeter comprises two parts: a socket and a main body. The socket is a detachable end that is cast into the first lift of concrete. The main body is a protective outer case which houses a vibrating wire displacement transducer and screws into the socket. Once screwed into the socket, it is cast into the second lift of concrete.
The transducer has a vibrating wire sensing element which is anchored at one end and connected to a spring loaded push rod at the other end.
Any movement applied to the push rod causes the spring to contract or elongate, causing an increase or decrease in the vibrating wire tension. This tension is directly proportional to the movement applied and therefore the opening or closing of the joint.
Product Features
•Highly accurate and robust; accuracy unaffected by cable length
•Connecting cable is strong, screened and flexible and can be used in lengths in excess of 1000m
•Option to fit a thermistor
•Over-voltage surge arrestor fitted to protect
•Against electrical damage
•Waterproof and sealed to 7 bar pressure
•Accommodates shear movement
Product Benefits
•Over 30 years of expertise in the design and manufacture of Vibrating Wire instrument technology
•Very good longterm stability
•Suitable for remote reading and datalogging
•Thermistor option enables examination of temperature effects
Ordering Information
Vibrating Wire Embedment Jointmeters
Armoured cable can only be fitted on site with joint sealing kit CA-4.1
J1-1-50 50mm range
J1-1-100 100mm range
J1-1-50-T 50mm range with thermistor
J1-1-100-T 100mm range with thermistor
Connecting Cable and Fittings
CA-3.1-4-IC Instrument cable, 4 core, 7/0.20; screened, polyurethane jacket, priced per metre
CA-4.1 Joint sealing kit
CA-4.2 Coloured adhesive tapes; set of 10No
CA-4.3 Crimping tool
CA-4.4 Crimping sleeves; set of 100No
W6-6.1 Nylon ties; 150mm x 3.5mm, pack of 100No
ST1-3.5 Nylon ties; 370mm x 4.7mm, pack of 100No