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Description
:
Inductive proximity switches are ideally suitable for no
contact sensing of metallic objects. As inductive sensors work on
electromagnetic principle, they are inherently resistant to dust,
humidity and oil in industrial environment. Besides Proximity detection,
continuous development in the field has led to new applications
such as distance measurement with Analogue Types. Low power consumption
,availability in wide range of packages and low unit price has made
them very popular in industry.
Standard
Barrel Types
Housings of standard inductive ranges are made of Nickel coated
brass barrels. They are widely used in non-corrosive atmospheres. |
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Limit
Switch Style Blocks.
With housings moulded in engineering plastic material these switches
replace mechanical limit switches. KATLAX offers Models with multiaxes
sensing to adopt design flexibility.
Flat
Types.
These models in engineering plastic are best fit for conveyor belt
applications to overcome z-axis limitations. They virtually substitute
mechanical micro switches.
Slotted
Types.
Designed for RPM measurement and zero speed detection these slotted
versions are also available in engineering plastic housings.
Design
And Principle
KATLAX Inductive Sensors are no contact type electronic sensors
comprising of three components oscillator, comparator and output
stage. Catalogue specifies sensing distance for Fe ST-37 grade steel
plate and necessary Correction Factor must be considered for different
metals. ( refer table 1 ).
Operation
The oscillator creates high frequency electromagnetic field which
radiates from sensing face of the sensor. When damped with metallic
object, eddy currents are induced in metal causing change in amplitude
of oscillations. This signal is conditioned to change Schmitt trigger
output and state of output amplifier. Analogue DC output voltage
and current are available in addition to standard PNP/NPN switching
outputs.
Definitions....
Sensing
distance(Sn) :
Distance at which output signal is triggered when standard target
is moved towards sensing face.
Standard
target :
Square plate st-37 /Fe length of the side equal to sensing face
diameter.
Correction
factor(C.F.) :
If target differs from standard test target, then the applicable
published sensing distance must be multiplied by appropriate correction
factor.
| MATERIAL |
C.F. |
| Mild Steel |
1.00 |
| Stainless
Steel |
0.70 |
| Brass |
0.45 |
| Aluminum |
0.35 |
| Copper |
0.25 |
Hysteresis(H) :
Difference in distance between operate and release points given in terms
of percentage of sensing distance. KATLAX switches are designed for
3% to 15% over its range of operating conditions.
Repeatability(R)
:
The repeatability of actual switching point of two successive switching
within 8 hours.
Temperature
:
The normal temperature range between 0 to 70 Deg.C.
Switching
Frequency (F) :
Highest frequency at which proximity sensor can be switched.
Mounting
Instructions :
For Cylindrical
Forms :
Shielded :
Sensor can be mounted flush in the metal.
Unshielded
: There must be space equal
to diameter of sensing head with no metal interference.
For Limit
Switch Styles :
40Block type switches : Mounting should be done as shown.
Electrical
and Mechanical Specifications :
Supply Voltage(Vb)
:
Maximum ripple of 10% of supply voltage should not be exceeded.
Voltage
Drop(Vd) :
Maximum voltage drop measured across conducting output.
Current
Consumption(Ia) :
Maximum current drawn by switch.
Output Load
Current(IL) :
Maximum current switch can sink or source should not be exceeded.
Output Protection
:
KATLAX switches are protected against
BACK EMF,
REVERSE POLARITY,
& INDEFINITE OUTPUT SHORT- CIRCUIT.
Magnetic
Fields :
Strong Magnetic Fields may push proximity switch into latching condition.
e.g. Induction Furnaces. Protective screening is recommended in such
cases.
Cable Length
:
KATLAX standard proximity switches are furnished with 3m Cable. Longer
lengths add capacitive coupling on output leading to switching limitations
and /or noise problems.
Status :
KATLAX switches are provided with LED indication.
Protection
Class :
KATLAX Proximity Switches are approved for IP67 class of protection
against ingress of water at specified pressure and time conditions.
Electrical
Configurations :
NAMUR SENSORS
These low current two wire sensors developed at KATLAX are approved
by CMRI., Dhanbad for INTRINSICALLY SAFE AREA APPLICATIONS as per IS
5780-1980 and can be operated in Ex-PROOF areas Gr I,IIA,IIB,IIIC .
DC/AC SWITCHING
SENSORS
These high output current driving capacity sensors are manufactured
to operate over wide range of supply conditions 10 to 30 Vdc / 40 to
250Vac.
ANALOGUE
SENSORS
These are available in standard process contol protocol viz. 4-20 mA.
/0-10V output proportional to target distance.
- Metallic or Plastic with Cylindrical, Flat, Slot or Customized
Mounting, Certified for IP 67, Short Circuit, Overload, Polarity
reversal Protection.
- Reflex, Retro-reflective, Through Beam, Colour Mark.
Range :
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