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From Zambia

4 Digital LED Display Tachometer RPM Speed Meter Panel Inductive Hall Proximity Switch Sensor NPN RPM Test Meters(Red)

3.6
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Product ID: 513513827
Brand:
walfront
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About the item

  • ✔【Good Stability】Good stability, high precision and strong anti-interference ability.
  • ✔【Convenient To Install】The external appearance adopts standard size and convenient to install.
  • ✔【Input pulse signal】 NPN/PNP open collector ,contact switch, contactless switch, level pulse.
  • ✔【Input signal voltage】 low level: -30V -0.6 V, high level: 4-30V.
  • ✔【Measuring range】 frequency: 9999Hz, 999.9 HZ, 99.99 KHZ, automatic sw selection.
Descriptions: Digital LED tachometer adopts the latest A/D conversion chip and the high stability benchmark IC, adopts electronic chip component, reasonable circuit design. It can be applied to the measurement of voltage, current and external sensor to measure temperature, pressure, displacement and other physical quantities. Suitable for all kinds of digital instrument display. Specifications: Measurement accuracy: ±0.1% Display mode: 0.56"LED Display refresh rate: >3 times/sec Working power supply: DC8-24V, 30mA, measurement range: 10-9999RPM Hall proximity switch : magnetic Appearance size: 80 x 42 x 25mm/3.14 x 1.65 x 0.98inch LED display(Optional): red, blue Weight: 80g(red),105g(blue) Overrange display: the first one shows "1" or "-1", and the latter three do not show Precautions: 1. Connect the plug correctly according to the wiring diagram 2. Should avoid strong electromagnetic interference and it is better to use shielded wire or double stranded wire for measuring conductors 3. The counting signal of the counter and the switch of the zero clearing signal input or the circuit shall be as close as possible to the terminal of the counter to make the signal line as short as possible 4. Avoid with other such as: high voltage wires or power wires and so on with same tube or twisted trace line, in order to avoid unnecessary interference.If necessary, please use the shielded wire, shielding layer connect the"+" of the count terminals 5. It is not recommended to use a mechanical switch or micro switch because they have a relatively short life span and can be counted by mistake after long time. If you use a mechanical switch or a micro switch, please try to use a better quality, so as not to miscount, and strongly suggest a magnetic control switch
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