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Proximity Sensors: Response Time

FAQ No. FAQ01074

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Question

What is "Response time"?

Answer

When the sensing object moves at high speed and it passes continuously, the response of proximity sensor is important.

The response of proximity sensor is defined by response frequency and response time, please confirm satisfaction for movement speed or interval of sensing object.

The response of proximity sensor is defined by response frequency and response time, please confirm satisfaction for movement speed or interval of sensing object.

OFF delay time: the time from non detection of the sensing object to turning off

Generally, the ratio is as follows because of the circuit.

ON delay time : OFF delay time = 1 : 2

Response time is estimate by response frequency.

Actual ON delay time and OFF delay time is shorter than estimated time.

How to calculate estimated response time

t1: ON delay time (ms) = 1 ⁄ Response frequency (kHz) x (ON delay ratio)⁄(ON delay ratio + OFF delay ratio)

t2: OFF delay time (ms) =1⁄ Response frequency (kHz) x (OFF delay ratio)⁄ (ON delay ratio + OFF delay ratio)

Example: E2E-X3D1-N (Response frequency 1kHz)

t1: ON delay time (ms) =1/1 x ( 1 )/ ( 1+2) = 0.3ms

t2: OFF delay time (ms) =1/1 x ( 2 )/ (1+2)=0.7 ms