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electrical center b2c
XD Digital Tachometer with Hall Sensor, DC Motor Speed Meter, Digital Display RPM Gauge for Motor
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hall sensor tachometer,motor speed meter
Product Description
Overview
This high-precision digital tachometer adopts Hall sensor technology to measure motor rotational speed. It features 3 LED display color options, stable reading with ±0.1% accuracy, widely used for DC motor / 马达 speed monitoring. Matching Hall switch model: NJK-5002C, NPN normally open type.
Specifications
- Product Name: Digital Tachometer
- Power Supply: DC 8-24V, 40mA
- Display: 0.56" LED, 4-digit reading
- Measuring Range: 10 ~ 9999 RPM
- Accuracy: ±0.1% of reading ±1 digit
- Dimension: 804032mm
- Weight: approx. 80g
- Over-range indication: "LLLL" for below range; "HHHH" for over range
Package Options
- Green (Motor Tachometer)
- Blue (Motor Tachometer)
- Red (Motor Tachometer, Recommended)
- Tachometer Mount Bracket
Precautions
- Avoid strong electromagnetic interference. Use shielded or twisted pair cables for signal wiring. Do not route signal wires together with high-power cables to prevent interference.
- The matched Hall switch is 12mm diameter NPN normally open sensor. You can replace it with other NPN NO sensors.
- Firmly fix Hall switch and magnet. The installation gap between Hall sensor and magnet must be within 10mm. Vibration will cause unstable or jumping readings.
- Do not mount magnet on ferrous metal, it will interfere measurement. Magnet has polarity; reversed installation leads to no reading.
- Mechanical / micro switches are NOT recommended due to short service life and miscount risk. Magnetic Hall sensor is strongly recommended.
Troubleshooting
| Issue | Cause | Solution |
|---|---|---|
| Shows "LLLL" | 1. Hall sensor not connected2. No magnet detected / too large gap / misaligned3. Actual speed too low4. Defective Hall switch | Install Hall sensor & magnet correctly; test within measuring range; replace Hall switch |
| Shows "HHHH" | 1. EMI interference (e.g. inverter)2. Actual speed exceeds max range | Use shielded anti-interference Hall sensor, connect shield wire to Hall blue wire; test within range |
| Jumping / inaccurate reading | 1. EMI interference (inverter)2. Eccentric rotating disc3. Loosely fixed sensor/magnet | Use shielded Hall sensor; replace with concentric disc; firmly secure sensor and magnet |
Attribute Table
product_name: XD Digital Tachometer with Hall Sensor
product_type: Industrial Sensor & Meter
material: Plastic + Metal
display_type: 4-digit LED digital display
led_color: Red / Green / Blue
sensor_type: Hall Effect Sensor
hall_model: NJK-5002C
output_type: NPN Normally Open
operating_voltage: DC 8V-24V
current_draw: 40mA
measuring_range: 10~9999 RPM
measurement_accuracy: ±0.1% reading ±1 digit
product_size: 80*40*32mm
weight: 80g
mounting: Optional metal bracket
application: DC motor, motor speed measurement, RPM monitoring
FAQ
Q1: What sensor does this tachometer use?
A: It works with NJK-5002C Hall effect sensor (12mm NPN normally open). Other NPN NO hall sensors are compatible.
Q2: What power supply do I need?
A: DC 8V to 24V, working current 40mA.
Q3: What does "LLLL" / "HHHH" mean on screen?
A: LLLL = speed below measuring minimum limit. HHHH = speed over maximum measuring range. It can also be caused by bad wiring or sensor misalignment.
Q4: What is the maximum gap between hall sensor and magnet?
A: Keep distance ≤10mm. Magnet must be properly polarized, cannot attach to iron metal.
Q5: Can I use mechanical micro switch instead of hall sensor?
A: Not recommended. Mechanical switches have short lifespan and miscount. Hall magnetic sensor is preferred.
Q6: Will inverter affect reading?
A: Yes, inverters cause electromagnetic interference. Use shielded anti-interference hall sensor and shielded twisted cable.
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