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Soil mechanics

Calibration equipment for geotechnical laboratory

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General description
General description
Any laboratory needs to verify periodically the calibrations of their electronic measuring systems, in order to produce reliable and accurate results. Equipment for calibrating force, displacement, volume change and pressure measuring devices.

Force measurement 
For calibration of force measuring devices we propose the following load cells fitted with digital readout unit, supplied complete with ACCREDIA calibration certificate according to EN ISO 376.

Pressure measurement 
Pressure calibrations are performed with a digital pressure gauge, supplied complete with ACCREDIA calibration certificate.

Volume change 
Calibration of the volume change apparatus can be simply performed by weighing the water coming out of the device, using any digital balance with 0.01 g resolution,

Displacment Measurement 
Calibration of displacement measuring devices can be performed with either the analogue or digital micrometer 25 and 50 mm travel respectively, 0.001 mm resolution. They are both available, optionally, with a traceable calibration certificate 25 mm and ACCREDIA certificate 50 mm 

Local strain measurement 
The calibration is performed with a special device that can also be used for standard linear displacement transducers with up to 50 mm travel.

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Technical specifications

Force measurement 

Load cell

- Linearity: <=0.03%
- Hysteresis: <=0.03%
- Repeatability: <=0.01%
 
Digital readout unit 
- Accuracy: <=0.02%
- Standard resolution: (2mV/V) ± 25000 div.
- Internal resolution: ± 32000 div.
- Zero and peak functions
- Auto power off function.
- Supplied with four 1.5 V AA size alkaline batteries.
- Typical battery life 1 year.

Pressure measurement 
- Linearity and hysteresis: <=0.05%
- Internal resolution: 65000 div.
- Zero and peak function
- Auto power off function.
- Supplied with four 1.5 V AA size alkaline batteries.

Displacment Measurement  
Code 30-WF0652 30-WF0653 30-WF0653/K
Type Analogue/mechanical Digital Digital
Maximum travel [mm] 25 50 50
Resolution [mm] 0.001 0.001 0.001
Dimesions (wxdxh) [mm] 260x60x100 300x60x107 300x60x107
Weight [ kg] 0.6 1.5 1.6


Ordering info

LOAD

Load cell
30-WF0372/SIT
5 kN load cell complete with ACCREDIA calibration certificate and stainless steel loading seat.
30-WF0373/SIT
50 kN load cell complete with ACCREDIA calibration certificate and stainless steel loading seat.
NOTE: In order to issue the calibration certificate, the load cell must be ordered complete with digital readout unit

Digital readout unit
30-WF6601
Digital readout unit for load cells
NOTE: one digital readout unit can be used for both load cells 

PRESSURE

30-WF6305/SIT
50 bar digital pressure gauge complete with ACCREDIA calibration certificate.

VOLUME CHANGE
see Top loading balances

DISPLACEMENT 

30-WF0652
Calibration device for displacement with analogue micrometer, 25 mm travel x 0.001 mm resolution.
 
30-WF0652/C
As above with traceable certificate
 
30-WF0653
Calibration device for displacement with digital micrometer, 50 mm travel x 0.001 mm resolution.
 
30-WF0653/C
As above with ACCREDIA certificate

30-WF0653/K
Calibration device for local strain trasducers and standard linear displacemet trasducers up to 50 mm travel 

30-WF0653/KC 
As above with ACCREDIA certificate

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