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JM Series Vibrating Wire Jointmeter
The JM series of vibrating wire (VW) displacement transducers are used to measure movements at joints and cracks in structures and foundations (concrete, rock, soil)
The JM utilizes a vibrating wire sensor attached to a spring tensioned between two anchors. Any variation of distance between these anchors will change the tension in the wire. The sensor is protected by a sliding stainless steel housing.
3 models are available:
The JM-S Crackmeter is attached to the surface of the structure using groutable or bolt-on anchors. Ball joints at each end of the sensor compensate for any anchor misalignment. The JM-S is also available in 3-D configuration for measurement in three orthogonal directions, or with special clamps for installation on a geogrid.
The JM-E Embedment Jointmeter is embedded in concrete structures such that its active length spans the construction joint to be monitored. This model consists of two sections: the socket and the sensor, which are installed and connected during two successive concrete lifts.
The JM-T is used in Borehole Extensometers.
A thermistor is integrated to the JM allowing temperature measurement.
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SPECIFICATIONS
|
Range |
25, 50, 100, 150, 2001, 2501, 3001 mm |
|
Overrange |
1.00 × range |
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Accuracy |
± 0.25 % F.S. (± 0.1 % in option) |
|
Resolution |
0.02 % F.S. (min.) |
|
Operating temperature |
−20 °C to +80 °C |
|
Thermistor |
3 kΩ |
|
Cable |
IRC-41A, IRC-41AP, IRC-3902, IRC-21A (JM-T) |
|
Length ‘A’ of JM-S (mid-range) |
289.5, 357, 500, 651, 797, 933, 1076 mm |
|
Length ‘A’ of JM-T (mid-range) |
230.5, 298, 442, 593, 738, 875, 1018 mm |
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Length of JM-E (at rest) |
383, 432, 602, 772 mm |
|
Diametre of JM-E (flanges) |
47.6 mm |
1 Ranges not available for JM-E model
2 Available only with JM-E
ORDERING INFO
Please specify:
- Model
- Cable length and type
Optional accessories:
- Mounting accessories: Universal joints, anchor types (groutable rebar or expandable)
- Other special mounting accessories
- Readout instruments