PLC Training in Chennai

Wiztech Automation Solutions
ISO 9001:2008 Certified

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P & FI Training


Any device with which a physical quantity such as flow, temperature, level, distance, angle or pressure could be measure is called an instrument. They may be simple like direct reading thermometers or they could also be multi-variable process analyzers. Instruments are used in all the manufacturing plants but their usage is many times more as a part of control system in refineries, factories and vehicles. The “control of processes” is the main branch of applied instrumentation. There are also hand-held devices to measure some desired variables.


A transmitter is a device which produces an output signal, mostly in the form of a (4 – 20) mA electrical current signal. There are others using voltage, frequency, pressure or Ethernet also. Signals transmitted could be for informational purposes or they could also be sent to a PLC, DCS, SCADA system, lab view or other types of computerized controller, where the signals are interpreted into readable values and used to control other devices and processes in the system.


P & FI Training at Wiztech Automation is offered in a detailed manner. Students are made to work practically with the pneumatics and Field instruments – their circuitry and I/O connection with PLC / DCS thereby making the students much conversant to work with a professional expertise.


These pneumatics and field instruments are connected with the input module or output module of PLC / DCS. It will produces 4-20 mA electrical current which is used measure pressure, temperature, flow, velocity of a particular object or liquid or semisolid particles in open or closed area.


A sensor is a converter that measures a physical quantity and converts it into a signal which can be read by an observer or by an (today mostly electronic) instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. A thermocouple converts temperature to an output voltage which can be read by a voltmeter. For accuracy, most sensors are calibrated against known standards.

Sensors are used in everyday objects such as touch-sensitive elevator buttons (tactile sensor) and lamps which dim or brighten by touching the base. There are also innumerable applications for sensors of which most people are never aware. The most widely used sensors measure temperature, pressure or flow. Applications include manufacturing and machinery, airplanes and aerospace, cars, medicine and robotics.


In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.

The most familiar form of switch is a manually operated electromechanical device with one or more sets of electrical contacts, which are connected to external circuits. Each set of contacts can be in one of two states: either "closed" meaning the contacts are touching and electricity can flow between them, or "open", meaning the contacts are separated and the Switch is non-conducting. The mechanism actuating the transition between these two states (open or closed) can be either a "toggle" (flip switch for continuous "on" or "off") or "momentary" (push-for "on" or push-for "off") type.


Limit Switches are electro-mechanical devices that consist of an actuator mechanically linked to a set of contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection. Our limit switches work in a variety of applications and environments because of their ruggedness, simple visible operation, easy installation and reliable operation.

Some other Pneumatic & Field Instruments are

  • Solenoid valve
  • Motor (AC/DC/SERVO)
  • Hydraulic piston/pump
  • Pneumatic piston/pump
  • Relay
  • Lamp

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