Suppliers of Inductive Proximity Switches, Capacitive Proximity Switches, Optical Proximity Switches, Magnetic Proximity Switches, Electronic Speed Switches, Pull Cord Switches, Belt Sway Switches, Heavy Duty Limit Switches, a comprehensive range of Process Control Instruments & Automation Components. These products are widely used in automobile, electronics, pharmaceutical and food industries.

1. Maitry Instruments & Control
Shop No. 42, 1st Floor, Akshar Shopping Center, Road No. 1,
Udyognagar, Udhana, Surat - 394 210, Gujarat, India
www.maitryinstruments.com
Mobile: +(91)-9825570174, Mail id:- mailtryst@yahoo.in
Belt Monitoring Switches
For Protection of Conveyors
Electronic Speed Switches :
Protection against Zero / Under / Over speed condition
Features
= Under / Over / Zero speed protection.
= Cast Al / Poly carbonate / Polyester enclosure.
= Multi range model for reducing inventory. Range 5 to
5000 RPM selectable.
= Built in initial start up Nuisance time delay.
= Contact 1 NO+1NC, 2 NO+2NC.
= 4 to 20 mA retransmission output.
= IP65 grade protection.
= Digital display models.
= Non contact type sensor probe. Size :
M18/M30/M50/M80
= Intrinsically safe model available.
= Sensor probe with extension stand.
Electronic Belt Loading Monitor
Model : BLM5511
Application
= To monitor load as well as well as speed of the conveyor.
SELECTION TABLE
Please follow the nomenclature as below.
ESM 4411 - TD - CA - 55 - 11 - 30
BASIC TYPE PROBE SIZE
ESM4410 - Speed Indicator M18, M25, M30, M50
ESM4411 - Under speed monitor
OUTPUT CONTACT COMBINATION
ESM4412 - Over speed monitor
11-1 NO + 1 NC
ESM4413 - Under + Over speed monitor
22-2 NO + 2 NC
ESM4414 - Under speed with extension stand
PROTECTION GRADE
OPERATIONAL FEATURES IP 30, IP55, IP 65
TD - Built in initial bypass Delay ENCLOSURE TYPE
NTD - Nuisance Delay MS - Sheet Metal CA - Cast Aluminum
NITD - Combined Nuisance + Initial Delay PL - Plastic / Poly carbonate
DD - Digital Display SS - Stainless Steel for Chemical
S - Selector switch for multi range.
Heavy duty Limit Switches
Model - HLS 802
Features
= Heavy duty enclosure for dusty environment.
= Cast Al / cast iron.
= Robust spring to absorb the belt impact.
= Grade of protection IP65.
= Heavy duty contacts 16 Amp @ 240VAC
= Contact combination 1No + 1NC / 2NO + 2NC / 4 NC
= Retaining type Screws.

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Belt Monitoring Switches
For Protection of Conveyors
Pull Cord Switch
Features
= Heavy duty enclosure for dusty environment.
= Cast Al / cast iron / Poly carbonate enclosure.
= Retaining type screws.
= Heavy duty contacts 16 Amp rating 240VAC,
= Contact combination 1NO+1NC / 2NO+2NC.
= Manual reset.
= Models available with junction box / with indicating
lamp / with mechanical flag.
Ordering Code
S B S 3 0 - 1 - C A - T B - F - L -
flag
Basic Enclosure Indicator
Model CA - Cast Al.
Indicating
PL - Poly Carbonate
1 + 1 NO + 1 NC Lamp
CI - Cast Iron
2 + 2 NO + 2 NC
With Junction Box
Belt Sway Switch
Features
= Heavy duty enclosure for dusty environment.
= Cast Al / cast iron / Poly carbonate enclosure.
= Ball / bush bearing options for roller & cam shaft.
= Grade of protection IP65.
= Heavy duty contact 16 Amp @240VAC
= Contact combination 1 NO+1NC / 2NO+2NC.
= Auto reset type.
= Retaining type screws.
= Robust spring to absorb the belt impact.
Ordering Code
S B S 4 0 - 1 - C A - T B - L - D
Basic Model With Indicating
1- 1 No. + 1 NC Junction Lamp
2- 2 No. + 2 NC Box
Handle roller
Enclosure & shaft with
CA - Cast Aluminum ball bearings
PL - Poly Carbonate
CI - Cast Iron

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Signal Isolaters & Converters
Specifications
l Din Rail mounted signal converter / isolator is available in
different input.
l 0-5mVDC / 0-20mVDC / 0-50mVDC / 0-100mVDC / 0
10mADC / 0-20mADC / 4-20mADC / 0-5 VDC / 1-5
VDC / 0-10VDC / 0-5Amp / 0-1 Amp or customer
specified, up to 3 outputs are available with all port
isolation i. e. supply to input / supply to output / input to
output and output to output channel isolation.
l Unit is available in 24VDC, 110VAC and 230VAC supply.
Level Sensors
Rf Admittance Type Ultrasonic Sensors
l Three Element Coat Guard Technology l Size : M18/30
Ignores material build - up on Probe l Supply : 24VDC
l Applications : Sand levels, Cement, Lime l Output : 0-10 VDC / 4-20 mA
etc. l Sensing Dia : 600mm /1500mm
l Supply : 24 VDC, 230 VAC
l Output : 2No+2NC
Photo Electric Level Sensor
l Infrared Sensor for liquid Level detection
l Ex-proof
l Supply : 24 VDC
Vibrating Fork Type l Output : PNP/NPN Type
l Suitable for highly dusty environment l Dimension : 3/8 x74 mm
l Mounting Material : Polysulphone
Rotating Paddle Type
l Motor torque adjustable
Magnetic Level Switch
l Special Clutch mechanism to protect Motor
l 2,3,4 point Switching Available
l Sealed bearing for Rotating shaft.
Rotary Encoders
Encoder is light sensor that detects and converts mechanical means the number of pulse which is output from 1 revolution
transfer or displacement into electric signal. It detects the of the rotating shaft of rotary encoder. In case of incremental
position, speed, angle by means of converting analog signal encoder, it can be indicated in the number of rotating slits, in
generated from a revolution of the shaft into digital signal by case of Absolute encoder, it can be indicated in number of
the internal fixed circuit. divisions or bit High resolution from 100 to 6000 P/R
Output Circuit Types : Power Voltage : 5 VDC/24 VDC
1) Open Collector 2) Push Pull Output 3) Line Driver Outer Diameter : 30,40,48,58 mm
Output Channels Shaft Diameter : 6mm, 8mm
1. A,B Phase
The output signal of A, B phase are output with 90 of phase
difference. It is the signal to discriminate the rotation
direction.
2. Z Phase
One Z phase is output per one rotation, which is called origin
signal.
Resolution (Pulses per Revolutions)

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Inductive Proximity Switches
Intelligent Sensors in Automated Processes
Maitry Instruments & Control offers you a Miniature Sensors
Our miniature sensors with short circuit protection
wide range of high quality Proximity Switches. M 8 x 30 mm & M 12 x 30 mm with LED Indication
these are used in all areas of control & Types of Inductive Proximity Switches
AC Proximity Switches - Type PS 12
automation such as Machine Tools, Packaging, These are available in 2 wire and 3 wire as shown. These
Injection Moulding, Automobile Industries, switches are to be connected in series with the load.
Process Industries, Textile Industries and Operating Voltage : 110VAC/240VAC/90-240VAC
other Automated Systems. Logic : NO/ NC/CO
Load : up to 500 MA
Operating Principle
The LC oscillator circuit generates the electromagnetic field
over the active face, energy is drawn from oscillator. resulting 2 Wire 3 Wire
p p
RED
damping of the oscillator. This Change is detected by the RED
GREEN
electronic circuit to give output signal. IPS BLACK IPS BLACK
Advantages LOAD LOAD
LOAD
l Non Contact Operation l Corrosion Resistance
N N
l High Operating Frequency l IP 67 Grade of Protection
l Bounce Free Operation l Repeat accuracy ± 0.02 mm
l Vibration Resistance l Long Life
Enclosure DC Proximity Switches - Type PS 13
Proximity Switches are available in Tubular shape made of These are available in 3 wires as shown. Special models of 2
BRASS , S.S., M.S. Other odd Shape Switches or as per wires and 4 wires are available on request
customer requirement can be made available on request. Operating Voltage : 5V to 30V DC (up to 220V DC on request)
Operating Temperature Logic : NPN / PNP
Operating Temperature of Proximity Switches is O0c to 55 c. Load : up to 400 MA
Temperature up to 1000c can be manufactured on request.
Protection
AC Switches are protected against transients and surges. DC 3 Wire + 3 Wire +
NPN PNP
Switches are protected against Short Circuit and Reverse RED LOAD RED
Polarity. IPS GREEN IPS GREEN
BLACK BLACK
Mounting LOAD
In case of Flush Mounting the sensing distance is limited to
_ _
0.8 times of the sensing distance for Non Flush Type.
3xd
d d d
2xsn
d
Dimensional & Technical Specification
Size Sensing distance Load Current
Steel
Steel mm in mm in ma
Flush Non Flush For AC For DC
Ø 6.5 1 - - 250
Tubular Switches : Enclosure Type M8 1.5 2 - 250
Size 12 18 24 30 36 50 M12 2.5 3.5 250 250
DC 50 70 65 70 70 65 M18 5 7 400 250
AC 80 70 70 70 70 65 M30 10 12 400 250
M 36 15 18 400 250
M50 15 20 400 400
LED
M80 30 35 - 400
17X17X36 7 - 250
20X20X38 7 - 250
L 26X12X40 3.5 - 250
A/F 40X40X112.5 13 20 400 400

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Inductive Proximity Switches
Intelligent Sensors in Automated Processes
M5 x 30 M8 x 45 M18 x 80
M30 x 80 M12 x 50 M50 x 80
20 x 20 x 38 17 x 17 x 36
40 x 40 x 112-5 20 x 20 x 50 26 x 12 x 40 20 x 16 x 12
8 x 8 x 40 Gap Size : 10 mm 40 x 40 x 112.5
50 x 25 x 10 50 x 22 x 42 T Shape : 10 mm 25 x 25 x 65
Capacitive Proximity Switches
l Adjustment Sensitivity
l Size : M18, M30
l Supply : 10-30 VDC/ 240 VAC
l Logic : PNP / NPN / NO / NC
l Enclosure : Brass / Plastic

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Optical Proximity Switches
Diffuse Scan Sensor
Maitry Instruments & Control offers
Optical Proximity Switches with
modulated infrared beam consisting of a
transmitter and a receiver. The state-of-the-art
17 x 50 x 55
modulation and detection circuit ensures M18 x 55 M12 x 60
reliable operation of sensors in hostile
environment and are unaffected by Through Scan Sensor
temperature variation and stray light.
Applications
These are widely used for sensing metals and non-metals like
wood, glass, paper and water, etc.
These switches are used for automation in various industries
like pharmaceutical machines, packaging machines, food
processing, textile machines, conveyor systems, Automobile M18 x 75
engineering industries, Chemical Plants, Cement Plants,
17 x 50 x 55
Safety and Security appliance.
Specifications Retro - Reflective Sensor
l Supply : 10-30 Volts DC
l Output : NPN or PNP type
l O/P Current : 200 mA (Max.)
l No Load Current : 5 - 10 mA approx.
l Drop across switch : Less than 1 Volt
l Switching frequency : 100 Hz., 2KHZ
l Protection : Reverse Polarity and 17 x 50 x55
M18 x 55
Short Circuit Protection
Fork/Slot Sensor
60 x 20 x15
Fork Gap : 50, 5, 20, & 3 mm. 70 x 50 x15 70 x 50 x15
90 x 70 x 15
Magnetic Proximity Switches
Any Shape/ Any Size
2 Wire, 3 Wire D. C. version Available

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Switching Mode Power Supplies
Maitry Instruments & Control Offers you a wide Salient Features
range of high quality Switching Mode Power l Low cost, high reliability.
Supplies. These are used in all areas of control and l High efficiency and high working temperature
automation such as Machine tools, Packaging, l Compact size, lightweight
Injection Moulding, Automobile Industries, l 100% full load burn - in test.
Process Industries and other Automated Systems. l Short circuit / overload protected / over voltage
protected.
l Built-in EMI filter, low ripple noise.
Specification
Input voltage : 90 to 270 AVC
Input frequency : 47 to 63 Hz
Inrush current : Cold start Limited by NTC
thermistor
Overload protection : Constant voltage, constant
current
105% to 120% output
foldback limiting.
Holdup time : Greater than 20 m sec.
High voltage test : I / P to O / P 3 KV 1 min.,
162 x 96 x 105 130 x 70 x 55 I /P to O/P 1.5 KV 1 min.
Safety standards : As per UL 1012 requirement
Model Available EMC & EMI : Tested for FCC class A
5VDC upto 20 Amp Cooling : Natural Cooling
12VDC upto 20 Amp Noise suppression : By means of heavy duty
24VDC upto 20 Amp EMI and RFI filter
48VDC upto 10 Amp can with stand 2 kV noise
60VDC - 5 Amp between Line & N, L &
Combination Models Earth, N &E.
are also available. Operating Temperature : 0 to 55 0C
I/P voltage surge protection : By means of proper rating
MOV
140 x 80 x 65
Electromagnetic Vibrator Controllers
For Bowl / Liner feeders New Advance Version (CVCF)
Constant voltage, constant frequency controllers for smooth
vibration and constant feed rate irrespective of change in
supply voltage and frequency for Genset application.
Specification
Supply : 230 / 41 5 VAC 2 phase 50 Hz
Current : 3/6/10/15/30 Amp
Voltage setting : Via potentiometer / 4 to 20 mA
control signal 144 x 96 x 115
Retransmission O/p : 4 to 20 ma for PLC 144 x 72 x 115 96 x 96 x160
Protections : Overload and fast acting fuses.
144 x 144 x 80 160 x 160 x 240

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Digital Timer
On Delay / Int / Cyclic Mode
Specifications
Display : Single / Double Display type
Setting : By front key pad / Thumbwheel type
Reset : On front / power ON reset
Output : 2 C/ O relay contact 5 Amp / 230VAC
Supply : 230V / 110VAC +/- 10 %, 50 Hz
Size : 48 X 48, 72 X 72, 96 X 96, 48 X 96
Range : 0-9999 / Hr. sec / min
Optional : Auto reset
Single set / dual set point
Memory facility
Weekly Timer
Common Features :
l RTC Format Display 00.00 to 23.59
l Bright red 0.56" seven segment display for time
indication
l User-friendly programming using tactile switches
l Program enable provided
l Memory back-up in case of power failure for one week
l Operating Voltage range : 85V to 265V AC.
l 1 C/O relay rated for 10A @ 250V AC / 28V DC
(Resistive)
l Dimension : 72 x 72 x 85 mm
l Program Steps : 4 / 8 /30
Digital Counters
Event / Preset / Length Counters
Specifications
Setting : Keypad / Thumbwheel
Range : 999999 counts
Display : Single /Double
Input : PNP / NPN Proximity, Limit switch,
Encoder or 230VAC pulse
Output : 1 C/ O, Relay, 5 Amp / 230VAC
Reset : Manual / Auto reset selectable by key pad
(Reset time selectable by keys in auto mode)
Supply : 230C / 110VAC +/- 10 %, 50 Hz
Size : 48 X 48, 72 X 72, 96 X 96
Optional : Reset on back terminal
Dual set point
Programmable scale factor
Up-down counter ( for encoder input)

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Digital Rpm Indicator / Controllers
Specifications
l Display : Single / Double
l 4 digit non-contact (RPM indicator)
l Bright red.0.5 seven segment display
l Range: 1 RPM to 9999 RPM
l Accuracy : +/- 1% of FS
l User programmable speed limit trip point with keypad
l 2 C/O relay output rated for 5A @ 240VAC /28VDC
(Resistive)
l Accepts NPN /PNP proximity switch inputs
l Input : 1 pulse per revolutions / Scale Factor
l Supply 110V / 230VAC
Dimensions: 48 X 96, 72 X 72, 96 X 96
Alarm Annunciator
Specifications
Microprocessor based 8 / 16 /32 channel alarm annunciator
accept input from potential free contacts, power supply
available 230VAC or 24VDC or customer specify flashing rate
55/60 flash per minute, front key switch available for
ACCEPT and TEST as well same function is available on back
panel for remote operation, additional power contact through
relay is available for alarm signal to connect warning light /
hooter etc.
Micro-processor Based Scanner
Specifications
l Micro processor Based Scanner is available in 8 /16
channel, sensor input available universal T/C type or
RTD or analog signal (0-5V / 1-5V / 0-10mA / 4-20mA
or resistance potentiometer) or mixed input sensors,
individual channel input and high / low alarm is
programmable from front key.
l Available in 90-270 VAC or 24 VDC supply.
l Isolated communication port for RS232 or RS 485
l Inbuilt 16 Relay output ( High or Low )
l Individual alarm indication LED ( 16 Channel )
l User programmable
l Alarm logic
l Relay grouping
l Sensor break logic
l Channel name 8 Character
l Alphanumeric LCD display
l Units display

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AutoTuned PID Controllers
Basic Features Multi-input and multi - range performance
= Includes a new processing system, Expert PID,
remarkably improved PID control efficiency; overshoot
and undershoot are controlled effectively.
= The keylock function can avoid erroneous operation
resulting from set values or parameter settings.
= High/Low alarm available as basic feature.
Features :
= PID, ON/OFF, Manual & PID modes. =Universal input.
= Relay/SSR/Analog output.(Current & Voltage)
= Size : 48x48, 48x96, 72x72, 96x96 =Heating /Cooling output available.
= Auto tuning facility. =Retransmission output.
Temperature Sensors
Types of Thermocouples : 'K' (Chromel - Alumel ) ,'J' (Iron-
Constantan). 'T' (Copper-Conslantan), 'E' (Chromel-
Constantan), 'R' (Pt-Pt-13%-Rh) ; 'S' (Pt-p 10%-Rh), 'B' (Pt-
13%-Rh-Pt-6%-Rh) in Simplex. Duplex and Triplex.
Types of Resistance Temperature Detectors : Pt-50, Pt-100,
Pt 500, Pt-1000, NI-100, Cu-2000 in Simplex, Duplex and
Triplex.
Types of Insulations : Ceramic Insulation and Mineral
Insulation.
Types of Junctions : Grounded, Ungrounded (Isolated), Selection of Thermocouple Type as per temperature
Types of Sheaths : Mild Steel, SS-304, SS-316, SS-310. SS- Temp. range Resolution
446. Inconel -600, Inconel - 800. Titanium. Cast- Iron, in C Type of Thermocuple in C
Nickel, Ceramic (610), Recrystlised Alumina (KER-710), etc. - 40 to 760 'J' (Iron-Constantan) 1
Shapes & Sizes : Asper your requirement or application.
- 40 to 1260 'K' (Chromel-Alumel) 1
Mounting Accessories : Thermocouple and RTD
connectors, BSP / NPT / UNF/ Metric threaded Male - 184 to 371 'T' (Copper-Constantan) 1
Female adjustable ferrule fitting in Mild Steel/ Stainless - 50 to 1741 'R' ( Pt-Pt-13%-Rh) 1
Steel-304/316/Brass etc. All type of flanges available as per - 50 to 1767 'S' ( Pt-Pt-13%-Rh) 1
standard table and as per your requirement or application
- 200 to 550 ( 100 othms RTD Pt-100 Bullb) 1
considering pressure in Mild Steel, Carbon Steel, Stainless
Digital Temperature Indicator / Controllers
Specifications
Input sensor
a. Thermocouple : Iron-constantan (Fe / con)-up to 4000C
Chrome l- Alumel (Cr /Al)-up to 12000C
Platinum-Platinum-Rhodium (Pt/Pt-Rh-13%)
up to 16000C
b. RTD : Resistance Temperature Detector ( Pt-100) low
temperature & up to 4000C
Accuracy : +/-0.5% of FSD
Compensation : Cold junction compensation automatic for all
thermocouple models
Relay Output : One change over relay contact 5 Amp / 230VAC
rating
Control Action : ON-OFF or time proportional
Control version : Single set point or Dual set point
Power Supply : 230VAC+/-105.50Hz
Max. Ambient temp.: 550C
Setting : Keypad / Knob / Push to set
Size : 48 X 48, 72 X 72, 96 X 96,48X96

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Solid State Relays & Relay Modules
Maitry Instruments & Control offers wide range of solid
state relays. Solid state relay is a static electronic switch
Input (Control)
unlike in an electromechanical relay where switching Specifications Min. Max. Units
takes place between two moving contacts, Switching Control Voltage Range 3 32 VDC
in SSR takes place across the junction of semiconductor
75 240 VAC
device. Devices are Triac or Thyristor for AC switching & 0 0
Transistor for DC switching. In most SSRs galvanic Input Current -40 C < ta < 80 C 20 mA
separation is achieved by Optocouplers equipped with Turn off Voltage - 30 c < ta < 80 C 1 VDC
integrated trigger circuit. (optotriac) provide the 4 VAC
switching function required for the corresponding load Turn on Voltage - 40 C < ta < 80 C 75 260 VAC
type. Isolation ( Input to Output, 10 OHMS
Maitry Instruments & Control Manufacture SSRs Input to case Output to case )
from current rating 2A to 150 Amp. Output (load)
Output Voltage : 240 v or 600 VAC.
DC output relays with rating 110 VDC 10 Amp. to 100Amp. Specifications Min. Max. Units
Output Current rating
with heat sink 0.05 10 25 AMPS
15,40,60 RMS
Load Voltage rating 25 480 VAC
Relay Modules
Relay modules are available like 2/4/8/16 channel with ( RMS )
base with fuse protection, Relay O/p = 1C/o / 2C/o Frequency rang 47 70 Hz
contacts. Surge Current rating
( 20ms ) at 40 amp type 425 AMP
Over voltage rating
( transisent peak ) 1200 V Peak
Thyristrised Power Controller
For the electrical heating system to control the temperature at Energy conservation + Better results
the set point by switching contractors has many
disadvantages, such as wear and tear, limited life of General Specification
contractor, noisy operation. Besides these it has limited Input : Single/Three phase AC 50 Hz.
accuracy due to limitation of speed of operation, hence loss Output : 0-95% of rated input. (lockable
of power. All above mentioned disadvantages are eliminated 50-100%)
by SCS Thyristor Controller. Control Signal : Local-Multiturn potentio meter.
Applications Ambient Temperature : 450 C Max.
l All types of Electrical Heating Systems. Standard Capacities
l Infrared Ovens. Single Phase up to 10 kw
Three Phase up to 200 kw
l Vacuum Brazing Furnace.
l Continuos Annealing / Bell Furnace.
Salient Features
l From medium to higher capacity
or single / three phase load
l Sturdy and Rugged Design.
l Facility of Local and Remote Operation.
l Good accuracy over full range.
l Better external noise immunity.
Standard Protections
Built-In
l Adjustable over current limit.
l dv / dt protection by RC snubber.