This is a demo store. No orders will be fulfilled.


3139_0 Micro Load Cell (0-100g) - CZL639HD, 3139


This small load cell measures shear forces of up to 100g and connects to a bridge input.


A load cell is a force sensing module - a carefully designed metal structure, with small elements called strain gauges mounted in precise locations on the structure. Load cells are designed to measure a specific type of force, and ignore other forces being applied. The electrical signal output by the load cell is very small and requires specialized amplification. Fortunately, Phidget Bridge Interfaces will perform all the amplification and measurement of the electrical output.

Load cells are designed to measure force in one direction. They will often measure force in other directions, but the sensor sensitivity will be different, since parts of the load cell operating under compression are now in tension, and vice versa.

This Single Point Load Cell is often used in small, high-precision scales. It’s mounted by bolting down the end of the load cell where the wires are attached, and applying force on the other end. Where the force is applied is not critical, as this load cell measures a shearing effect on the beam, not the bending of the beam. If you mount a small platform on the load cell, as would be done in a small scale, this load cell provides accurate readings regardless of the position of the load on the platform.


Load cells require a power source and produce a very small voltage differential when under strain. In order to read this signal, an amplifier or a board with a high-precision analog-to-digital converter is required.


warning Make sure to calibrate your load cell before using it. You can find information on how to calibrate the cell in the Load Cell Primer. You should also have a look at the User Guide for the bridge interface board that you're using to read the load cells.

Sensor Properties

Sensor Type

Shear Load Cell

Controlled By

Bridge Input

Weight Capacity Max

100 g

Maximum Overload

120 g

Cell Repeatability Error Max

± 50 mg

Cell Non-Linearity Max

50 mg

Cell Hysteresis Max

50 mg

Electrical Properties

Rated Output

600 μV/V

Rated Output Error Max

± 150 μV/V

Output Impedance

1 kΩ


100 mg/hr

Temperature Effect on Zero

5 mg/°C

Temperature Effect on Span

5 mg/°C

Supply Voltage Min

3 V DC

Supply Voltage Max

10 V DC

Zero Balance Ratio

± 100 μV/V

Physical Properties

Operating Temperature Min

-10 °C

Operating Temperature Max

40 °C

Compensated Temperature Min

-10 °C

Compensated Temperature Max

60 °C

Cable Length

110 mm

Cable Gauge

4x 30 AWG


Aluminium Alloy (LY12CZ)

Screw Thread Size



3.2 g


Bridge Interfaces

Load cells and strain gauges produce a very tiny voltage differential and must be read by a high-resolution analog-to-digital converter. You can connect this load cell to a bridge interface as described in this table:

Function 3139 Bridge Interface
+5V Red 5V
+ Green +
- White -
Ground Black G
Functional Functional