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Site Updated
2 February 2017

Extensometers

High-temperature
Room-temperature

High-temperature extensometer

The spring force is less than 500 grammes

Description
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 ).

Si-Plan extensometers of this design have been in continuous use for over 10 years.

Application
Ideal for strain control cyclic fatigue and creep fatigue applications, where long term stability is essential.

Construction
Manufactured from a special nickel alloy with high corrosion resistance even at temperatures in excess of 950°C.

Operating temperature

Standard range: up to 850°C

Extended range: up to 950°C

Gauge length

Standard range: 6 - 10mm

With additional plate: 6 - 25mm
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.

Arm length
The extensometer arms can reach up to 180mm into a thermal enclosure.

A high-temperature matching furnace is also available

Mounting adaptors
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.

Furnace
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.

Extensometer classification
The Si-Plan Electronics Research Ltd extensometer can achieve classification 0.5 as defined in EN 10002-4 : 1994.

Specification
Supply voltage range Supply current Output for 1mm displacement Output change with supply voltage Linearity error Resolution 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 Frequency response	± 12V to ± 16V +12mA -7mA 10 volts 40mV/V @ 1.1mm ± 0.12% FS 0.2µm 1mV/°C 1.6mV/°C 4mV rms 9mV rms 0.4 - 4.5 pF 30 hertz with phase shift < 0.5°

Room-temperature extensometer

Photographs above show extensometer model 676110.

Features

Accuracy to BS EN 10002-4 Grade 1.0.

Lightweight: 55 grammes.

Robust design with integral gauge-length setting pin.

Hardened carbon steel wedge form knife edges (replaceable) attached to test piece by O rings. Other knife forms and attachments available on request.

User-configurable knife edges give 3 precise gauge length options on each of the 4 models (dimensions over):

10 to 20mm. 100 - 50% strain range.

20 to 30mm. 50 - 33% strain range.

30 to 40mm. 33 - 25% strain range.

40 to 50mm. 25 - 20% strain range.

Low operating force: 0.3 newtons.

Nominal sensitivity: 1.6 mV/V/mm

Temperature coefficient: Standard temperature coefficient trimmed for steel specimens, ie 12 microstrain/°C.

Maximum operating temperature 80°C.

Linearity 0.2% for 0 - 2% strain range. 0.5% for 2 - 5% strain range. 1.0% for 5 - 10% strain range.

Bridge voltage range 5 - 10 volts.

Supplied with 2 metre cable fitted with 4-pin DIN plug.

Description
The Si-Plan Electronics Research Ltd extensometer employs spring steel dual beam strain gauged sensing elements to measure displacement for

static tensile testing
fatigue testing

Supplied with gauge length setting piece.

Special requirements
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.

4-pin DIN plug connections

Dimensions

Dimensions in millimetres
Model number	Gauge length			Height	Width	Depth
	A1	A2	A3	B	C	D
676123	10	15	20	25	16	78
676122	20	25	30	35	16	78
676110	30	35	40	45	16	78
676121	40	45	50	55	16	78
Specifications may be updated. Check when ordering.

Updated 20 April 2005