Magnetic Sensor, A normal one; Produces an output according to presence of magnetic field. These sensors contains a contact NO or NC or Both NO+NC. Near around the magnetic periphery, Sensor’s contact changes its state. While Out of the magnetic periphery it regain its normal state. The state of the contact depend upon the presence of magnetic field; As these sensors does not hold its state.
Magnet has two poles ‘North‘ & ‘South‘. But normal magnetic sensors can not distinguish the pole. The state of the contact of the sensors always remains the same near the magnet; irrespective to its pole.
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In a GIF :
MAGNETIC BI-STABLE SENSOR BY PROSIS
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- BI-STABLE means 2 stable states
- SCHALETR means switch
According to the name; This magnetic sensor is having 2 stable states. This sensor is specially designed to distinguish the poles of the magnet, On each pole; It behaves differently. Sensor’s contact get closed near to the south pole of the magnet While its contact remains opened near the north pole.
It also holds its contact’s state even after the removal of magnetic field.
BI-STABLE MAGNETIC SENSOR’S WORKING
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In a GIF :
It is an arrangement of series connection in which senor & DC bulb are connected in a series such that positive supply first passes through the sensor & then; through the DC bulb.
- When a South pole reaches near to the sensor; Its contact get closed Which results bulb starts glowing. Contact remains closed even when a magnet goes out from the sensor; Signal get Hold. Moving near the south poles again & again; does not produces any changes in its contact. Contact remains closed !
- When a North pole reaches near to the sensor; Its contact get opened which results bulb stops glowing. Contact remains opened even in the absence of the magnet; Again signal get hold. Moving the north poles again & again; does not produces any changes in its contact. Contact remains opened !
SPECIFICATIONS OF MAGNETIC BI-STABLE SENOSR BY PROSIS
Power Supply
- Sensor can get work on both power supplies AC as well as DC . Max. Rated AC supply is; 130VAC
- Max. Rated DC supply is; 180VDC.
- Max. Power consumption is 10VA
- Max. Current Rating is 1 Amps
- Number of Wires : 2 Wires
Dimensions
- Length : 150mm(approx.)
- Diameter : 18 mm
APPLICATIONS OF MAGNETIC BI-STABLE SENSOR
In lift system
Magnetic Bi-stable sensors are used to detect the floor level. As discussed, sensor can distinguish the north & south pole of the magnet & it also holds the state according to magnet pole.
Floor level are marked with small magnets in an alternate manner, Such that north pole, south pole, north pole, south pole. Due to alternate pattern, sensor produces alternate pattern signal to micro pressor. According to stored program & total feedback, microprocessor calculates the floor level.
SUMMARY
- The content discusses two types of magnetic sensors: normal and bi-stable.
- Normal magnetic sensors, including reed switches, change their contact state based on proximity to a magnetic field but cannot distinguish between the poles of a magnet.
- In contrast, bi-stable magnetic sensors by PROSIS can identify north and south poles, having two stable states and retaining their contact state even after the magnet’s removal.
- Magnetic bi-stable sensors are utilized in lift systems to detect floor levels by recognizing the alternating magnetic poles.