FQ(D) - Reed Frequency Meter

Hauptbild - FQ(D) - Reed Frequency Meter
Austausch der Skala bei Schalttafeleinbaugeräten und Messgeräten zur Hutschienenmontage - FQ(D) - Reed Frequency Meter
Properties
  • Measuring range from 45 Hz to 65 Hz

  • Good readability

  • Minimum temperature influence

  • Low self-consumption

Description

The FQ(D) reed frequency meters are used for frequency measurement in AC networks. They are available with single measuring system (FQ) and with double system (FQD). The reed frequency meter is the simplest way to display the frequency in AC or three-phase networks. The accuracy can be guaranteed over a very long period of time because the material and the carrier system do not age. Voltage fluctuations up to ±15% and sinusoidal waveforms have no influence on the measurement. The double-tongue frequency meter FQD, with two rows of tongues, can be used to synchronise two networks.

Variants

FQ 72 72 x 72 mm for panel mounting
FQ 96 96 x 96 mm for panel mounting
FQ 144 144 x 144 mm for panel mounting
FQD 72 72 x 72 mm for panel mounting - Double frequency meter
FQD 96 96 x 96 mm for panel mounting - Double frequency meter
FQD 144 144 x 144 mm for panel mounting- Double frequency meter

Mechanical Design

The frequency meter FQ has a vibration measuring system in which a comb with springy reeds is attached to an electromagnet. If the frequency of the applied voltage corresponds to the resonance frequency of a reed of the vibration measuring system, this reed starts to vibrate. The deflection of these reeds is proportional to the square of the applied voltage. The FQD reed frequency meter has two voltage inputs and is therefore also equipped with two vibration measuring systems.

Technical Data

Technical Data

Accuracy class

0,5

Housing

Polycarbonate self-extinguishing, according to UL 94 V-0

Protection class

Housing IP 52
Terminals IP 00 (IP 20 for size 45)
according to 60529: 1989

Mounting position

vertical ± 5°

Self-consumption

Ammeter 0,3...1,2 VA
Voltmeter 1,5...4,0 VA

Environmental Conditions

Climate class

2 according to VDE/VDI 3540

Temperature

Reference range +18 ... +28°C
Working range -25 ... +55°C
Storage -40 ... +70°C

Relative humidity

≤ 80 % (without condensation)

  • Reed frequency meter:

           Type
    Measuring range Voltage [V] Reed quantity FQ 72   FQ 96 FQ 144
    47...53 Hz  110, 230 13
    47...53 Hz  400, 500 13
    57...63 Hz 110, 230 13
    57...63 Hz 400, 500 13
    45...55 Hz 110, 230 21 -
    45...55 Hz 400, 500 21 -
    55...65 Hz 110, 230 21 -
    55...65 Hz 400, 500 21 -

     

    Double Reed frequency meter:

          Type
    Measuring range Voltage [V] Reed quantity FQD 96
    FQD 144
    2 x 47...53 Hz 110, 230 2 x 13

    2 x 47...53 Hz

    400, 500 2 x 13
    2 x 57...63 Hz 110, 230 2 x 13
    2 x 57...63 Hz  400, 500 2 x 13
    2 x 45...55 Hz 110, 230 2 x 21
    2 x 45...55 Hz  400, 500 2 x 21
    2 x 55...65 Hz 110, 230 2 x 21
    2 x 55...65 Hz  400, 500 2 x 21

     

Ordering Information

The following data must be provided when ordering:

Instrument type
Measuring range and voltage
Number of reeds


Order examples:

FQ 96; 55 ... 65 Hz; 110 V; 21 reeds
FQD 96; 2 x 47 ... 53 Hz; 230 V; 2 x 13 reeds

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