The spring-loaded axial high-temperature extensometer consists of an upper and lower arm which maintain contact with the specimen without the necessity for locating ridges or indents. This is achieved by means of a spring-block outside the furnace/heating arrangement. The spring force is less than 500 grammes. Extensometer arms are available with ceramic points or fork ends ( see insets in illustration left ).
Ideal for strain control cyclic fatigue and creep fatigue applications, where long term stability is essential.
Manufactured from a special nickel alloy with high corrosion resistance even at temperatures in excess of 950°C.
The gauge-length is set by the passive arm plate held in place by means of a locking-screw.
Standard working range
The standard working range of the extensometer is 1.1mm.
The extensometer arms can reach up to 180mm into a thermal enclosure.
Adaptors to mount the spring block from fatigue machine columns can be manufactured to customer specification.
Test machine frequency
Frequencies in excess of 10 hertz can be measured and controlled because of the low mass of the extensometer arms.
A high-temperature matching furnace is also available. Voltage converter unit
The extensometer is supplied complete with an extensometer capacitance to voltage converter unit. The capacitance to voltage converter unit produces a voltage proportional to the gap between a set of extensometer plates. A probe with a target of 8mm diameter has an operating range of 1.1mm. This allows ± 0.5mm displacement from a 0.6mm origin. A link is fitted inside the unit to provide zero output at 0.1 or 0.6mm.
The Si-Plan Electronics Research Ltd extensometer can achieve classification 0.5 as defined in EN 10002-4 : 1994.
Supply voltage range
Output for 1mm displacement
Output change with supply voltage
Temperature coefficient of output at 0.6mm
Temperature coefficient of output at 1.1mm
Output noise at 0.6mm
Output noise at 1.1mm
Capacitance range for 10 volt output
± 12V to ± 16V
40mV/V @ 1.1mm
± 0.12% FS
0.4 - 4.5 pF
30 hertz with phase shift < 0.5°
The Si-Plan Electronics Research Ltd extensometer employs spring steel dual beam strain gauged sensing elements to measure displacement for
Si-Plan Electronics Research Ltd has a history of building special rigs to customer requirements. The company is able to carry over this service to its standard product range, giving a flexibility to meet the needs of each customer - and in-house CAD systems and CNC machining mean a realistic delivery time will be achieved.
|Dimensions in millimetres|
|Model number||Gauge length||Height||Width||Depth|
|Specifications may be updated. Check when ordering.|
Updated 20 April 2005
Si-Plan Electronics Research Ltd, Avenue Farm Industrial Estate,
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