7539 Transducer Amplifier

Transducer amplifier

• Die-cast housing
• High accuracy
• Various outputs
o 4-20mA, 0-10Vdc and +/-10Vdc


The 7539 is a conditioning amplifier PCB assembly for use with strain gauge bridge transducers.
Supplied in a die cast box sealed to IP65 and powered from an external dc supply, it provides stabilised dc excitation to the bridge and generates an output of 3-wire 4-20mA, 0-10Vdc, 0-5Vdc or 2.5-7.5Vdc.
When powered by a bipolar supply, the voltage outputs can also be bipolar.
The amplifier has reversed supply protection, 25 turn Zero and Span controls and screw terminal connections.



• Power Supply
o 0/12Vdc to 24Vdc for 3 wire current and unipolar voltage outputs
o +/-12Vdc to +/- 15Vdc for 3 wire current and bipolar voltage outputs.

• Bridge Excitation
o 10Vdc stabilised (nom)

• Bridge Resistance
o 87 ohm minimum

• Bridge Sensitivity
o 0.3 to 3.0mV/V

o Input RF suppression

• Output 1
o 4 to 20mA  (max 30mA)

• Available load voltage
o V supply 9V

• Output 2
o 0 to 5V, 0 to +/-5V, 0 to 10V, 0 to +/- 10V and 2.5 to 7.75V

• Adjustments
o Zero; 25 turn pot
o Span; 25 turn pot

• Connections
o Screw terminals


• Non linearity error 0.01%
• Zero Temp coefficient 0.3 micro-volt/degree C
• Span Temp coefficient 0.01%/degree C


Additional Notes

Specification may change without notice



Welcome to Active Load.

tel: +44 (0) 1491 680123

Active Load provides complete transducer solution designing and manufacturing strain gauge transducers.

Strain gauge transducers are designed to be Load Cells, Force Sensors, Torque Sensors, Pressure Transducers and any other strain related product.

Active Load will incorporate the strain gauge cells with a strain gauge amplifier to achieve an enhanced signal. Many of our strain gauge load cells are designed to be in the form of load monitoring pins to measure rope tension. Other forms taken are as load monitoring links and compressive load cell.