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Moving Coil Meter

Moving-coil meters are intended for measuring d.c. voltage or d.c. current. These meters with built rectifiers can also be used for measuring a.c. voltages and a.c. currents. MA17P, MA19P, MA12P meters with built-in rectifiers are used for measurement of the rectified current or voltage arithmetical mean value and they are such calibrated that they indicate the RMS value at sinusoidal curve shape. The measurement of non- sinusoidal a.c. magnitudes results in additional errors. Meters are designed for mounting into panels. MB16 meters are adapted for a fast assembly rail mounting (35 mm rail) in compliance with EN 60715 standard MA16, MA17 and MA19 meters are designed for interchangeable dials.

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Moving-Iron Meter

Moving-iron meters are intended for measuring AC voltage or AC current. These meters measure the true RMS value and their indications are highly independent of the measured value curve shape. Meters are designed for mounting into panels. EB16 meters are adapted for a fast assembly rail mounting (35 mm rail) in compliance with EN 60715 standards. EA16, EA17 and EA19 meters are designed to interchangeable dials. 

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Bimetalic Ammeter With Maximal Current Indicator

Bimetallic and combined ammeters are especially intended for thermal monitoring of transformers, cables and other electrical devices which have a slow reaction to current changes. They indicate the mean rms current value during the measuring period of the meter (8 or 15 min.). These meters do not react to short current pulses essentially. The range of these meters can be enlarged by means of external measuring current transformers which are also offered

by LUMEL and can be delivered on request if the meter is ordered in the option enabling a direct assembling on the current transformer.

They enable:
– Thermal monitoring of electrical installation with a slow
reaction of current changes (transformer, cables, etc. …).
– Instantaneous reading of rms current values.
– Simple exchange od dials without internal interference.
– Direct plug in on measuring transformers.

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Combined Bimetallic And Moving-Iron Ammeters With Maximal Current Indicator

Bimetallic and combined ammeters are especially intended for thermal monitoring of transformers, cables and other electrical devices which have a slow reaction to current changes. They indicate the mean rms current value during the measuring period of the meter (8 or 15 min.). These meters do not react to short current pulses essentially. The range of these meters can be enlarged by means of external measuring current transformers which are also offered by LUMEL and can be delivered on request if the meter is ordered in the option enabling a direct assembling on the current transformer.

They enable:
– Thermal monitoring of electrical installation with a slow
reaction of current changes (transformer, cables, etc. …).
– Instantaneous reading of rms current values.
– Simple exchange od dials without internal interference.
– Direct plug in on measuring transformers.

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Moving-Iron Voltmeter with a change-over switch

The moving-iron panel voltmeter with a change-over switch is adapted for measuring line-to-line and phase-to-phase RMS voltages in 3-phase 4-wire power networks. A six-positional switch installed on the meter frontal side enables the choice of the measured voltage in six different points of the network system.

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ND10 – Three Phase Power Network Meter

The ND10 meter is a digital programmable panel meter destined for the measurement of the 3-phase, 4-wire power network parameters in balanced and unbalanced systems. It is also capable of displaying measured quantities and their simultaneous digital transmission. The meter is also capable of controlling and optimization of the power electronic devices, systems, and industrial installations. The meter can be used for measuring: RMS value of voltage and current; active, reactive and apparent power; active and reactive energy, power parameters; frequency, 15-, 30- and 60-minute mean active power and THD. Additionally, a current in the neutral wire is calculated from the phase current vectors . Voltage and current values are multiplied by given voltage and current ratios of measuring transformers. Power and energy indications take into account all programmed ratio values. Any and all measured values can be sent to the master via the RS-485 interface. The relay outputs signal alarm when selected parameters exceed set limits. Impulse output can be used for consumption check of the 3‑phase real energy. This meter is also able to detect and signal incorrect phase sequence. The meter is powered by the measuring circuit, i.e. from the voltage output.
There is a galvanic separation between following units of the meter:
– voltage and current inputs,
– RS-485 output,
– impulse output.

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Panel Pointer Frequency Meter

Pointer frequency meters are moving-coil meters with built-in measuring transducers intended for measuring
voltage frequency in AC electrical networks. These meters can be mounted on panels of any kind of materials.

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Panel Power Factor Meter With Built-in Transducer

Panel power factor meters are destined for measurements of the phase angle between the voltage and current in single phase or three-phase AC power networks. These meters are calibrated to correspond to the cosine of the angle, i.e. the power factor. These meters can be mounted on panels of any kind of materials.

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Panel Power Meter

The power meter is a mowing-coil meter with a built-in measuring transducer. It is destined to measure active or reactive power in a.c. power networks. The measured power is indicated by a magnetoelectric (moving-coil) measuring system.

These meters are delivered in following versions:
– for measuring the active power in single-phase systems,
– for measuring the active or reactive power in three-phase
three-wire or four-wire symmetrically or asymmetrically loaded systems,
– with the zero graduation on the left side of the scale for measuring the unidirectional power flow,
– with the zero graduation in the middle of the scale for measuring the bidirectional power flow.

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