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Digital Panel Meters for Shunt-Based Current Measurement

Digital panel meters with shunt input measure current via an external shunt resistor and convert the small voltage drop across the shunt into a digital measurement value displayed on an LED display. The instruments are designed for control cabinet installation, offer front protection up to IP65, and process standard shunt voltage signals (e.g. 0…75 mV, 0…100 mV). With scalable display, optional analog and relay outputs, they are suited for monitoring DC or AC currents in industrial circuits where current flow is measured by a shunt.

Questions & Answers

What are shunt-based panel meters used for?

They are used for current measurement in DC or AC circuits — for example in DC supplies, power supplies, motor current monitoring or battery charge/discharge systems — whenever current is monitored using an external shunt.

Which input signal ranges are supported?

The meters typically accept very low DC voltages, commonly 0…75 mV or 0…100 mV, generated by an external shunt. This voltage is digitized and then scaled to display the corresponding current value.

How is the current value determined?

The voltage drop across the shunt is measured and, using the known shunt resistance, converted into a current value. The scaling allows direct display of the value in amperes.

What display range is supported?

The display typically covers -19999 to 99999 counts, enabling high-resolution indication of small and large currents, displayed in amperes or other configured units.

Is scaling of the display value possible?

Yes — the display can be scaled so that the measured shunt voltage corresponds directly to the real current in amperes. Unit, decimal point, and measuring range are freely configurable.

What display and illumination options are common?

Usually a 5-digit LED display is used, available in colors like red, green, orange or blue. Brightness can often be adjusted in several levels for optimal readability under different lighting conditions.

Is there an analog output for processing the measured value?

Many models offer optional analog outputs (e.g. 0/4–20 mA or 0–10 V), enabling the measured current value to be forwarded to PLCs, controllers or data acquisition systems.

Are relay outputs for alarms or limit detection included?

Yes — typically one or two potential-free relays are integrated. These can be configured as under-, over- or window-limits to trigger alarms or switching actions when current thresholds are exceeded or not met.

What supply voltages are typical?

The devices are generally powered by 24 VDC (galvanically isolated) or via a wide-range power supply (e.g. 100–240 VAC), depending on the model.

How is parameterization performed?

Parameterization is done via a front keypad. Settings include the shunt resistance value, scaling, unit, decimal point, filtering, and configuration of analog and relay outputs — all without opening the control cabinet.

Can they measure both DC and AC current?

Depending on the design, a device may support DC or — with a suitably rated shunt and additional circuitry — even AC current measurement. The shunt and meter must be compatible with the intended current type.

How does the shunt design affect measurement accuracy?

The external shunt must be correctly rated for the maximum current and produce a defined voltage drop (e.g. 75 mV at nominal current). If the shunt is overloaded or overheats, measurement errors or damage may occur.

What housing and panel dimensions are typical?

The front panel usually meets IP65 protection and is designed for standardized cut-outs in switch cabinets — for example 96×48 mm or similar front frame formats depending on the model.