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SM39SP Series gear speed sensor is a kind of advanced speed sensor, used for non-contact to detect the speed of gear, with electromagnetic interference resistance strong OC door output plastic square wave signal, through the pull resistance adjustment can be directly connected with TTL, CMOS logic circuit, and speed meter can form speed measurement, control system. The product adopts the standard round pipe waterproof structure, has the advantages of waterproof, dustproof, oil prevention and other advantages, can work reliably in the harsh environment, suitable for automotive, industrial control and other fields. Operational principle: The SM39SP series gear speed sensor adopts advanced detection technology, which can distinguish each tooth top and tooth valley of the rotary detection surface, and convert it into a periodic square wave of the corresponding rate.

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Gear speed sensor technical function:

(I) Basic performance:

1. Rated test distance: 3mm
2. Speed measurement range: 10 r / min (one tooth per turn) ~20,000 r / min (60 teeth per turn)
3, output waveform: square wave

4. Duty cycle: 0.5 ± 0.2
5, protection function: equipped with power reverse connection protection and output short circuit protection
6, working temperature: conventional products-40~ + 85℃, if there are special requirements, please customize, the maximum temperature can reach 150℃

Gear speed sensor electrical performance:

modelparameter	SM39SP-A	SM39SP-B
Operating Voltage (DCV)	4.5～6	8～26
Static power consumption current (mA)	≤20mA	≤28mA
Output of leakage current to time (uA)	≤15uATest condition: Output control voltage =6V	≤20uATest condition: Output control voltage =24V
Output low-level saturation voltage (V)test condition:Output current is 20 mA	≤0.4	≤0.1
Rising along time tr (us)	≤1.0	≤1.0
Drop line time tf (us)	≤1.0	≤1.0
OC door	The maximum control voltage is 6V, and the maximum continuous passing current is 25 mA	High breakdown voltage type, the maximum breakdown voltage is 160V;The maximum continuous passing current of 600 mA;Allowed maximum power consumption, 625 mW at 25℃, higher than 25℃,5 mW / ℃
LED work instructions	not have	have

Gear speed sensor protective performance:

Waterproof, dustproof and oil-resistant.

Gear speed sensor performance requirements of the tested gear:

1.Modulus: m 1;
2. Tooth shape: involute or trapezoidal cylindrical straight teeth;
3. Gear thickness: 3mm;
4.Gear material: magnetic conductive material

Gear speed sensor sensor wiring
The product adopts the electromagnetic shielding form of single point grounding, and the sensor shell is connected with the shielding line. The user should connect the screen cover layer to the system at the receiving end. The specific wiring form is shown in Figure (1).