Electronics for force transducers and load cells

Force transducers prevent overload situations in machines and technical systems due to applied tension, compression or weight forces. Or that consistent product quality is achieved in manufacturing processes. Load cells, which are also force transducers, have the task of precisely determining weights and outputting them in standard units.

Sophisticated electronics are an important prerequisite for force transducers and load cells to function reliably: these ensure that the forces are precisely measured, evaluated and displayed. In many cases, force transducers and load cells are also intelligently connected to higher-level systems and control units. Primosensor offers a comprehensive selection of (evaluation) electronics for these purposes.

Panel Mounting

Hat Rail Mounting

Desk Housing

Large displays

Junction Box

Amplifier in Alu-Die-Cast Housing

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Measuring amplifiers for a wide range of applications

Inside the force transducers are strain gages, arranged in the form of a Wheatstone bridge circuit. These register when the force transducer or load cell is deformed by the forces acting on it and convert this information into a change in electrical resistance. This change in resistance is electrically evaluated and processed by suitable amplifier electronics. For example, by amplifying and converting them into reliable, standardized analogue or digital signals. Our range includes a number of such amplifiers and display devices:

  • Analogue measuring amplifier with standardized analogue output signals: 4…20mA / 0…+/-5V / 0…+/-10V
  • Fully redundant (2-channel), diversely designed measuring amplifiers with output signal 2×4…20 mA for redundant force transducers with 2 strain gauge full bridges. These measuring amplifiers are particularly suitable for increased safety requirements.
  • Digital measuring amplifiers with serial and bus interfaces such as RS-232 / RS-485 / USB / CANopen / ProfiBus / ProfiNet / Ethernet / …
  • Limit value switch with relay contacts in analog and digital version
  • Hand-held display devices with LCD display for mobile use
  • Stationary display devices for panel mounting or as desktop measuring devices with optional analog, digital and bus interfaces
  • Optional SIL electronics, complies with IEC 61508/61511, SIL3 for applications in stage technology with redundant controls

Easy to integrate and operate

Depending on the design and geometry of the force transducer, limit value switches, analog and digital measuring amplifiers can also be integrated directly into the force transducer. The prerequisite for this is that the space available in the sensor allows it.

However, if it is not possible to place amplifier electronics directly in the sensor, there are also alternatives. This means that a measuring amplifier can also be mounted on a top-hat rail in the control cabinet. Another solution is cable measuring amplifiers built into the measuring cable.

Digital display units with four or five-digit LCD displays, which are directly visible to the operator, ensure clarity. The display units provide information on current measured values and can be accommodated either in a panel cut-out or in a desktop housing. If you want to stay mobile instead, it is best to use a digital, battery-operated LCD hand-held display device. They are often used in the field of test and measurement technology in particular, where only occasional checks are carried out: for example in quality assurance, in service or when commissioning a new system.

We would be happy to advise you on the various options and compatible force transducers or load cells. Just get in touch with us!

Panel Mounting

5-digit Indicator

Primoforce®
5-digit digital display as built-in meter
Model: IND5R

5-Digit Indicator with inputs for mA- and V-standard signals and not amplified mV/V force transducers. The unit has highly visible 14 mm high LED digits and is suitable for panel mounting. Minimum and maximum values are stored. Programming is done via the front keys. Various units can be displayed. The device is optionally available in a desktop housing.

4-digit Indicator

Primoforce®
4-digit digital display 4/8-channel as built-in meter
Model: IND4R15

4-Digit Indicator with 4 or optional 8 inputs for mA- and V-standard signals. The input signals can, for example, be summed for display and limit values can be monitored via 4 or 8 relays. The available analogue output enables simple output and transmission of the measured values. The unit has highly visible 14 mm high LED digits and is suitable for panel mounting. Minimum and maximum values are stored. Programming is done via the front keys. Various units can be displayed. The device is optionally available in a desktop housing.

4-digit Indicator

Primoforce®
4-digit digital display as panel meter
Model: IND4R13

4-Digit Indicator with inputs for mA- and V-standard signals. The device is equipped with clearly visible 14 mm high characters. Minimum and maximum values are stored. Programming is done via the front buttons. Various units can be displayed. The device is optionally available in a desktop housing.

Hat Rail Mounting

DVST1

Digital Strain Gauge Amplifier

DGS4116

Digital Limit Switch

AGS3

Limit Switch

ELHA-xm010-301

Strain gauge analog amplifier

DGSZ4510

LCD display unit

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Hand-held display devices

Manual display with LCD display

Primoforce®
Manual indicator with LCD display for sensors with 4-20 mA or 0-10 V output and SIL test function
Model: CI1

3.5 digit mobile indicator for testing of sensors with industrial output signal 0/4…20 mA or 0….10 V. The device is battery- operated and therefore in particular suitable for on-site service or start-up of sites. The function of sensors can be checked easily. (The test signal of Primosensor SIL-force transducers can be activated and verified.)

Digital manual display with LCD display

Primoforce®
Digital Handheld Display with LCD display for sensors with mV/V output
Model: DHZ21

The DHZ21 digital handheld display is a battery-powered, mobile and universally applicable handheld terminal for strain gaugebased force and torque sensors. The display shows the measured value with sign, the measuring unit and the set decimal places. Factory calibration is performed according to your requirements in the units N, kN, g, kg, t or lb. By pressing a key it is possible to zero and tare the display or to recall the peak values -both in positive and negative force direction. The device comes standard with a black protective case with a stand-up function.

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Large display, terminal and trim box and strain gauge analog measuring amplifier

Large display

1- or 3-channel
Model: GAZ4R

4-digit digital display (optionally 6-digit) with 1 or 3 inputs for mA and V standard signals. In the multi-channel version, the input signals can be displayed in total. Limit values can be monitored via 4 optional relays. And an analogue output, which is also optionally available, enables easy output and transmission of the measured values.

The unit has highly visible 100 mm high LED digits (opt. 57 mm / 125 mm) and is suitable for wall mounting indoors and outdoors (IP64). Minimum and maximum values are stored. Programming and operation is via an infrared remote control. The 6-digit version can display various units of measurement (such as kN, kg, t, etc.). The 57 mm version generally has 6 digits.

Junction Box

Primoweigh®
Clamp and trim box in field housing
Model: KMBX

The junction box with robust Alu die-cast housing enables parallel connection of up to 4 force transducers or load cells with mV/V output signal to obtain a sum signal.

Strain gauge analog measuring amplifier

Primoforce®
Strain gauge analog amplifier in die-cast aluminum housing for field installation
Model: ELHA-xm010-301

Analog Amplifier in a robust aluminium box with mV/V input signal for force transducers or load cells – available with 4…20mA- or ±10V output signal. The robust die-cast aluminum housing makes the amplifier suitable for installation in the field.

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