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ALF250 | ALF251 Miniature Diaphragm Load Cell

Miniature load cells series ALF250 and ALF251

The ALF250 and ALF251 series are ideally suited to force measurements in confined spaces in both tension and compression for control of critical parameters in all kinds of industrial processes. Their versatility is such that they are also applied in a great number of important fields of scientific and engineering test work, mobile as well as workshop, static and dynamic.

Geometry:
Very small loadbutton cell for force measurement in confined spaces. Used in compression and/or tension on a wide range of OEM or end-user applications.

With bi-directional versions there is a small difference between the output signal for compression and tension. All standard bi-directional load cells are calibrated in both modes and the output for each direction is stated on the test / calibration certificate.

Technische Daten

Model ALF250 Model ALF251

Rated load:

100 / 200 / 400 / 800 N

100 N / 200 N / 400 N / 800 N /
1.6 kN / 3.2 kN

Non-linearity, terminal:

±0.5 % RL

±0.5 % RL

Hysteresis:

±0.5 % RL

±0.5 % RL

Creep, 20 min:

±0.1 % AL

±0.1 % AL

Repeatability:

±0.1 % RL

±0.1 % RL

Rated output, nominal:

1.6 mV/V

1.6 mV/V

Rated output, rationalised:

1.0 mV/V ±0.5 % RL

1.0 mV/V ±0.5 % RL

Zero load output:

±4 % RL

±4 % RL

Temperature effect on rated output:

±0.005 % AL/K

±0.005 % AL/K

Temperature effect on zero load output:

±0.03 % RL/K

±0.03 % RL/K

Compensated temperature range:

-10 … +50 °C

-10 … +50 °C

Operating temperature range:

-10 … +80 °C

-10 … +80 °C

Supply voltage, recommended:

5 V

10 V

Supply voltage, max.:

10 V

10 V

Bridge resistance:

350 Ω

350 Ω

Insulation resistance, minimum at 50 VDC:

500 MΩ

500 MΩ

Overload, safe:

150 % RL

150 % RL

Overload, ultimate:

200 % RL

200 % RL

Environmental sealing:

IP65

IP65

Weight (excl. cable):

approx. 8 g to 12 g

approx. 8 g to 11 g

Material:

stainless steel

ranges up to 200 N: aluminium
other ranges: stainless steel
Rated Load Structural Stiffness. nominal
 

ALF250

ALF251

100 N

6.2 x 106 N/m

3.7 x 106 N/m

200 N

1.2 x 107 N/m

7.3 x 106 N/m

400 N

2.5 x 107 N/m

1.5 x 107 N/m

800 N

5.0 x 107 N/m

3.0 x 107 N/m

1.6 kN

--

6.0 x 107 N/m

3.2 kN

--

1.2 x 108 N/m

Notes:

  1. RL = rated load
  2. AL = applied load
  3. Temperature coefficients apply over the compensated range.
  4. The load must be applied directly through the central loading axis.
  5. When this load cell is rationalised the resistors are housed in a capsule located in the load cell cable 100 mm from the free end. Capsule dimensions are Ø10 mm by 57 mm.

Dimensions

Model ALF250

Dimensions of loadcell ALF250

Model ALF251

Dimensions of loadcell ALF251

Dimensions in „mm“, approximate values.
These drawings are for information only and not intended for construction purpose. Please contact us for detailed drawings.

Electrical Connections

The loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 7-1-4C.

Wiring:

red

+ supply voltage

blue

- supply voltage

yellow

+ output signal

green

- output signal

orange

screen

The screen is not connected to the load cell body.
Reverse the signal connections to obtain a positive signal in tension mode.

Ordering Information

Unrationalised Output Rationalised Output

ALF250CFR0H0
ALF251CFR0H0

compression, IP65, loadbutton

  

ALF250CFR0HN
ALF251CFR0HN

compression, IP65, loadbutton

ALF250DFR0H0
ALF251DFR0H0

compression, IP65, thread fitting

  

ALF250DFR0HN
ALF251DFR0HN

compression, IP65, thread fitting

ALF250TFR0H0
ALF251TFR0H0

tension, IP65

  

ALF250TFR0HN
ALF251TFR0HN

tension, IP65

ALF250UFR0H0
ALF251UFR0H0

bi-directional, IP65

  

ALF250UFR0HN
ALF251UFR0HN

bi-directional, IP65

Please add range in the required units.

Safety Note

When using the load cell in tension mode it is essential to provide additional safety precautions like safety chains etc. for catching the load in a breakage, which cannot be excluded completely.

Information in the PDF datasheet (see above) may be more detailed. Due to continual product development, ALTHEN and partners reserve the right to vary the foregoing details without prior notice.