LM14 Inductive Proximity Switch

The LM14 NO Inductive Proximity Switch is a sensor that detects the presence of metallic objects using inductive sensing technology. It remains open (NO) when no object is detected and closes upon detecting a metallic object, making it useful for non-contact object detection in industrial automation applications.
 

FEATURES

Compact volume

High precision of repeated location

Diversified exterior structures

Long service life

Wide voltage range

Many output forms

With short-circuit protection

With inverted connecting protection

Dust proof, vibtation proof, water proof and oil proof

Good performance of anti-interference

High on-off frequency

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Working principle inductive proximity switch

 

Inductive proximity switch is composed of three parts: oscillator, switch circuit and magnified output circuit. The oscillator will generate an alternating electric field. When hemetal object approaches this electric field and reaches the induction distance, whirlpool will generate in metal object, resulting in attenuation of vibrati on and then stop. The changeof vibration and stop of oscillator is treated by begid stage magnified circuit and convertedto switching sign, triggering driving con-contact detection.

 

 

Application illustration of proximity switch

 

 

 

Features of proximity switch

 

Item Explanation Features About detected object
the size of detected object and detection distance

If the detected object is square metal sheet with constant thickness(t=1mm), detect at detection distance X when change its side length dmm.

When the detected object is bigger than standard detected object, on the main, the detection distance is constant.

According to different machine type, sometimes the features will be different with that mentioned on the left.

To through type, the detection object is like cylinder metal bar.

About detected object

When the material of detected object is non magnetic metal, the distance of action should deseend. But when the foil material is approximaterly thicker than a.01mm, the detection diatance willbe the same as that of magnetic object. lf the film plating is extremely thin or non-conductive, detection cannot be conducted.

The effect of cladding material ,when detected object has cladding material, take note of the changing of detection diatance.

the thickness of detected object and detection distance

Detect at detection distance Xmm (front detector) when change the thickn ess of the assigned standard detected object 1mm.

For more than 1mm thick magnetic metal like iron, on the main, the detection distance will not chaneg.

About ambient weather

In order to maintain reliable action and long service life, please avoid the (outdoor) occasion beond the stiplatedambient temperature. Do not drench it with water-soluble cutting lubricant when it is used with cover, althouththeproximity sensor is waterproof. Do not use in the occasion swith chemical agents, especially strong base, acid, nitric acid, hot strong sulfuric acid and so on.

the effects resulted from the thickness of detected object and cladding material

Because the detection to standard detected object will be effected by its shape, size, material, and various caldding material, confirm through detection distance Xmm measurement

The effects resulted from detection distance and cladding material of the metal excluded iron will be different according to different machine type.

On the main, the machine type which detects all the metals will not be effected by cladding material.

About maintenance and overhaul

In order to keep the proximity sensor to work stably for long time, the ollowing regular examinations should be performed just like general control.

1.Check the installation position of detected object and proximityseensor if any deviation, loosening of deformation exiss.

2.Check the attached wires and connecting parts if any loosening, bad contact or wire breaking off exists.

3.Check if there is any metallic powder accumulation or not.

4.Cherck if the temperature condition and surrounding environment condition are mormal or not.

5.Cherck if the detection distance is normal or not.

 

 

Series Connection And Parallel Connection

 

 

 

Model LM14
Dimension
Sense distance 3mm±10%
Flush type DC10~30VDC NPN NO LM14-3003NA
NC LM14-3003NB
NO+NC LM14-3003NC
PNP NO LM14-3003PA
NC LM14-3003PB
NO+NC LM14-3003PC
Two-wire system NO LM14-3003LA
NC LM14-3003LB
AC90~250VAC NO LM14-2003A
NC LM14-2003B
NO+NC LM14-2003C
Sense distance 8mm±10%
Non-flush type DC10~30VDC NPN NO LM14-3005NA
NC LM14-3005NB
NO+NC LM14-3005NC
PNP NO LM14-3005PA
NC LM14-3005PB
NO+NC LM14-3005PC
Two-wire system NO LM14-3005LA
NC LM14-3005LB
AC90~250VAC NO LM14-2005A
NC LM14-2005B
NO+NC LM14-2005C
Output current DC 200mA
AC 300mA
Output voltage peak DC type below 3V、Two wire type below 3.9V、 AC below l0V DC<3V, AC<10V
Consumption current DC type 8mA at 12V, 15mA at 24V, AC below 10mA DC<15mA, AC<10mA
Standard detected object 15×15×1 (A3 iron)
Repeatability 0.02
Response frequency 300Hz/25Hz
Ambient temperature -25℃-+75℃
Insulation resistance ≥50MΩ
Shell material Metal
Protection grade IP67
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