The SZM-4 magneto electric tachometer consists of an indicator and a sensor. Using a journal type wide-angle instrument as an indicator, it has the advantages of good vibration and impact resistance, stable indication, and high reliability. Connected through transmission lines without the need for an external power source, it can measure the speed of various power equipment from a distance.

Specification

Speed measurement range: 0-1500r/min (speed ratio 1:1)

0-3000r/min (speed ratio 1:2)

Accuracy level: 1.5 level (20 ± 5 ℃)

Working environment: Temperature -25~55 ℃

Relative humidity 5-100% (including frost)

Additional temperature error: When the temperature changes by 10 ℃, the additional indication error shall not exceed 1.2% of the upper measurement limit.

Resistant to mechanical force: able to withstand transportation shock with acceleration of 10g and impact frequency of 60-100 consecutive impacts per minute for 1000 times.

Weight: Indicator 590g Sensor 330g

Dimensions: Indicator ø 107 × 97mm Sensor ø 64 × 66.5mm.

Working principle

Sensors are mainly composed of permanent magnets and induction coils, with the permanent magnets connected to the power equipment through a flexible shaft. When the permanent magnet is driven to rotate, it induces a current in the coil, which is transmitted to the indicator through a wire. After voltage reduction and rectification, it drives the wide-angle ammeter to indicate the measured speed.