ALF306 Pancake Force Sensor

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Key features

• Full load range: 50N, 200N, 500N, 1kN, 2kN, 5kN, 10kN
• Load direction: compression
• Non-lin./hysteresis: 0.3/0.2 - 0.5/0.3% RL
• Dimensions (mm): Ø38 x 8

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About the ALF306 Pancake Force Sensor

The ALF306 is designed for compressive force measurements in situations where space is limited. Alternatively tensile load transfer can be achieved via a tie rod assembly through the center hole. In this way the loadcell can indirectly measure tensile loads in a ‘fail-safe’ mode.

In the event of structural failure of the loadcell the resulting vertical movement of the supported load will be very small.

We are happy to design variants of this loadcell to meet your specific requirements. Versions can be manufactured for higher temperature operation. Please consult our engineering department.

Geometry: Very low profile disc loadcell for use in force measurements.

Parameter	50N to 1kN	2 to 10kN	Unit
Non-linearity - Terminal	±0.3	±0.5	% RL
Hysteresis	±0.2	±0.3	% RL
Creep - 20 minutes	±0.1	±0.1	% AL
Repeatability	±0.1	±0.1	% RL
Rated output - Nominal	1.2	2.2	mV/V
Rated output - Rationalized	1.0	2.0	mV/V
Rationalization tolerance	±0.5	±0.5	% RL
Zero load output	±4	±4	% RL
Temperature effect on rated output per °C	±0.005	±0.005	% AL
Temperature effect on zero load output per °C	±0.01	±0.005	% 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	300	300	% RL
Sealing	IP65	IP65
Weight - Nominal (excluding cable)	20 to 50		g

The 50N range is manufactured in aluminium; the 200N to 10kN 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.

Notes
1. AL = Applied load. 3. Temperature coefficients apply over the compensated range.
2. RL = Rated load. 4. The load must be applied directly through the central loading axis.

Connections
The loadcell is fitted with 2 metres of miniature PVC insulated 4 core screened cable.
Excitation + = Red Signal + = White Screen = Orange
Excitation - = Black Signal - = Green
The screen is not connected to the loadcell body.

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