Digital LED RPM speedometer tachometer with Hall senzor review and wiring diagram

Good day here is my complete review , with schematic how to connect Hall proximity sensor to device CF5135B. I buy 3 pieces for start and here is my experience.In my review you see pros and cons, detailed instructions  how to plug and set this device with technical parameters.

I tried to run the speedometer for about 2 hours.After two hours, I found that the device was totally wrong, I will describe my mistake below where I give the correct scheme.Now the plus and minus of the device:

Here are the pros and cons of CF5135B spedometer tachometer:

Here is pros

  • Nice and solid design
  • Hall sensor can be extended
  • The end of the sensor hall has a twisting thread with nuts
  • Large LED display
  • Maybe have protection against reverse polarity (I plugged it completely opposite and it works)

Here is cons:

  • Poorly labeled wires may be mistaken when connecting, I will explain below
  • Supply voltage is 8-24V better would be 8-30V because it can not be used in 24V cars because charging is 29V (it’s not big minus)
  • This product has a lot of unnecessary and just a bit different versions

Price and buy:

Good price is under 10usd shipping include , this device can buy on aliexpress,ebay, amazon. But is carefull – watch photos closely  because many types of similar to this tachometer  for example with three wires yelow,red,black this review and tutorial does not describe this type

Detailed description CF5135B speedometer

 

Tachometer has black plastic box have clips for panel placement to electrical cabinet or other box. Display have 4 digits can buy Blue or Red its dimensions are around 67*32mm.

On the back of the speedometer is the range of speed measurement per minute and the range of supply voltage (8-24V) and consumption (40mA). Also the model name  CF5135B and down is wiring diagram that could be better.

Complete manual and schematic diagram:

Now I will describe how to properly integrate the RPM tachometer with hall proximity sensor:

My failure was that I was badly turned  the top-up display, then the order of the wires was exactly the opposite of the diagram and the device did not work (of course)

The RPM device must be rotated by the display down, then the correct wires according to the diagram on the back.

Here is a description of electrical wires on connector:

  1. + the positive power pole is connected to the brown wire for the magnetic sensor
  2. – negative power pole
  3.  speed sensor / blue wire from the sensor
  4.  Fourth position (nothing connect )
  5. speed / black sensor sensor

these are two verified circuit diagrams:

with electrical wire connections and power source
with electrical wire connections and power source
Schematic diagram CF5135B-z

 

Digital LED Tachometer RPM Speed Meter with Hall Proximity Switch Sensor NPN

Schematic for Hall proximity switch from ebay it’s like a baby is drawing it, in practice for laymen this diagram inappropriate .My schematic  is better:

Keep in mind that the HALL probe sensor only switches when the magnet is 1-10mm away.To test the wiring, run the magnet in front of the probe mthe speedometer on the LED display will show some value.

For information, here is a description of the hall sensor switch wires:

Brown: + Source 8-24V (36V max)

Blue: – Source 8-24V

Black: Signal inpuf from Hall senzor

Hall switch is model NJK-5002C , is compatible with RPM counter CF5135B

This forum is good info http://www.model-engineer.co.uk/forums/postings.asp?th=112167

 

Complete technical parameter od RPM counter speedometer CF5135B:

 

Blue /Red 4 Digital LED Tachometer RPM Speed Meter+Hall Proximity Switch Sensor NPN

  • Operating temperature: 0 to 50°C.
  • Red LED Specifications:
  • Power requirement:DC 8-24V
  • Measure range:10 ~ 9999RPM.
  • Error range: 0.1%
  • Clear zero:Automatic .
  • Clear zero time:About 10s.
  • Refresh frequency: 0.2-0.5S(120-1200RPM),0.25-0.06S(2400-9999RPM).
  • Response frequency:100HZ.
  • Measure indication:(RPM<5000,±2),(RPM>5000,±3).
  • Sign:NPN 5 wires normally open.
  • Display:5 x 2cm red LED.
  • Tachometer size:79 x 42 x 25mm.
  • Panel cutout size:76 x 39mm.
  • Hall proximity model:NJK-5002C .
  • Detected objects: Magnet.
  • Detection range: 1mm-10mm.
  • Proximity output current: 20mA(For the sensor).
  • Operating temperature: -10 to 60°C.
  • Sensor wiring:brown(Power+),black(Test+),blue(signal).
  • Sensor size: 60 x 10mm.
  • Sensor wire length:1.2M
  • Magnet:10x2mmFunction selection:
  • 1.Reset or manual reset on power.
  • 2.Store the data (no power).

 

Pacage include:
1 x Red LED tachometer
1 x NPN hall proximity sensor
1 x magnet

 

15 thoughts on “Digital LED RPM speedometer tachometer with Hall senzor review and wiring diagram”

  1. Hello, using this as a tacho on a boat; but misplaced the magnet. What type of magnet should I use in its place ? I had some neodymium magnets at home but they didn’t work with the sensor.

  2. Hello I have this all wired up the same as yours but when I turn on my motor the display only shows dashes across the screen. When I turn the motor off it goes back to zeros?
    But when I rotate the spindle buy hand it works fine?
    Any suggestions?

  3. Probably noise from the VFD. Keep the tacho wiring well away from the VFD leads. If possible use shielded wiring for the tacho (and the VFD if you can be bothered). You could also try wrapping the tacho power wiring around a ferrite core numerous times (close to the tacho) to reduce noise. Shield the wiring from the proxy if possible, keep it short and keep it away from the VFD and see if that helps. Have the proxy mounted on an Earthed metal plate if possible (e.g. an Earthed Aluminium bracket). Ensure the Motor is very well Earthed and if possible use proper shielded and Earthed VFD cable. .

  4. Hi,
    I bought two, they worked in the beginning and when I mounted them on the Tractor with an extension of the cable, they both did not work anymore. There is no display and at the interrupter the control lamp does not burn anymore. Why? I fed them with a 9V battery.

  5. Hi, is possible instead of using Hall proxinity sensor to take the signal form ignition coil? Does it works?

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