ALF308 cylindrical Force sensor

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Key features

• Full load range: 50N, 100N, 200N, 500N, 1kN, 2.5kN
• Load direction: Compression, tension, bi-directional
• Non-lin./hysteresis: 0.1/0.1% RL 0.35/0.1% RL
• Compact axial geometry
• Space saving male / female fixing
• Sealed to IP65

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About the ALF308 Cylindrical Force Sensor

The ALF308 is a compact axial loadcell with improved EFI compared to diaphragm loadcells. The inert base and top fixings with spanner flats allow ease of installation. The strain geometry possesses a plane with good EFI performance defined as perpendicular to the loading axis and the spanner flats. This is particularly useful when a loadcell is used to support mass with its weight acting perpendicular to the measurement axis.

We are happy to design variants of this loadcell to meet your specific requirements. Versions can be manufactured for higher temperature operation. Ranges from 100kg to 250kg can be manufactured for fully compensated operation up to +250°C. Please consult our engineering department.

Note:
EFI = Extraneous Force Immunity

The 20 and 50kg ranges are manufactured in aluminium; the 100 to 250kg ranges are manufactured in stainless steel. When this loadcell is rationalized, the resistors are housed in a capsule located in the loadcell cable 100mm from the free end. Capsule dimensions are Ø10mm by 57mm.

Connections
The loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 7-1-4C.
Excitation + = Red Signal + = Yellow Screen = Orange
Excitation - = Blue Signal - = Green
Reverse the signal connections to obtain a positive signal in tension mode. The screen is not connected to the loadcell body.

Parameter	50 to 500N	1 to 2.5kN	Unit
Non-linearity - Terminal	±0.1	±0.35	% RL
Hysteresis	±0.1	±0.1	% RL
Creep - 20 minutes	±0.2	±0.1	% AL
Repeatability	±0.05	±0.05	% RL
Rated output - Nominal	1.2	1.2	mV/V
Rated output - Rationalised	1.0	1.0	mV/V
Rationalisation tolerance (applies to single direction calibrations)	±0.5	±0.5	% RL
Zero load output	±4	±4	% RL
Output symmetry	2.0	2.0	% AO
Temperature effect on rated output per °C	±0.005	±0.005	% AL
Temperature effect on zero load output per °C	±0.01	±0.01	% RL
Temperature range - Compensated	-10 to +50	-10 to +50	°C
Temperature range - Safe	-10 to +80	-10 to +80	°C
Excitation voltage - Recommended	10	10	V
Excitation voltage - Maximum	10	10	V
Bridge resistance	350	350	Ω
Insulation resistance - Minimum at 50Vdc	500	500	MΩ
Overload - Safe	50	50	% RL
Overload - Ultimate	200	200	% RL
Sealing	IP65	IP65
Weight - Nominal (excluding cable)	50	70	g

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