Limit Switch

 

The limit switches is a transducer which converts a mechanical position contact into electrical switching contact. Limit switches may also be called as micro switches. The main function of a limit switch in a control valve is for sensing the ON –OFF position of a valve system remotely. The limit switch is attached to a control valve as shown below

The limit switch is attached to the actuator yoke by a suitable bracket at a required position. The lever connected to the stem will touch the limit switch roller that will make a change in the switching contact either NO or NC. This change in contact can be utilized for alarming, controlling, remote indication etc. Limit switches can be

Mechanical limit switches

Proximity limit switches working on electro-magnetic induction

Inductive or capacitive type limit switches

Photo electric limit switches

Parameter setting of  E+H LT

https://atomic-temporary-28241129.wpcomstaging.com/2018/04/29/parameter-setting-of-eh-fmp51-gwr-lt/

Siemens LT parameter setting

https://atomic-temporary-28241129.wpcomstaging.com/2018/04/29/parameter-setting-of-siemens-probe-lu-ultra-sonic-level-transmitter/

Parameter setting of KTek LT

https://atomic-temporary-28241129.wpcomstaging.com/2018/04/29/parameter-setting-of-ktek-mt-5100-gwr-lt/

Analysis of Pump Vibration

https://atomic-temporary-28241129.wpcomstaging.com/2018/06/08/analysis-of-motor-pump-vibration/

HART Communication

https://atomic-temporary-28241129.wpcomstaging.com/2018/06/17/hart-communication/

Instrumentation tube fittings

https://kishorekaruppaswamy.wordpress.com/2018/03/28/instrumentation-tube-fittings/

Radar LT non contact type

https://kishorekaruppaswamy.wordpress.com/2018/03/19/radar-non-contact-level-transmitter-working-and-parameters/

Rosemount GWR parameter setting

https://kishorekaruppaswamy.wordpress.com/2018/03/15/parameter-setting-of-rosemount-gwr-5300-series-lt/

Offset calculation GWR

https://kishorekaruppaswamy.wordpress.com/2018/02/14/offset-calculation-for-a-guided-wave-radar-level-transmitter/

Temperature transmitter types

https://kishorekaruppaswamy.wordpress.com/2018/02/13/temperature-transmitter-classification-tree/

Flow transmitter types

 

https://kishorekaruppaswamy.wordpress.com/2018/02/13/flow-transmitter-classification-tree/

Level transmitter types

 

https://kishorekaruppaswamy.wordpress.com/2018/02/13/level-transmitter-classification-tree/

Pressure  transmitter types

 

https://kishorekaruppaswamy.wordpress.com/2018/02/13/pressure-transmitter-classification-tree/

Piping and Instrument diagram

https://kishorekaruppaswamy.wordpress.com/2018/02/04/pid/

Smoke detector working

https://kishorekaruppaswamy.wordpress.com/2018/02/02/smoke-detector-working-principle/

 

Conductivity transmitter working

https://kishorekaruppaswamy.wordpress.com/2018/02/02/conductivity-transmitters/

Gas detector working

https://kishorekaruppaswamy.wordpress.com/2018/02/01/gas-detector-working-point-gas-detector/

Flame detector working

https://kishorekaruppaswamy.wordpress.com/2018/02/01/flame-detector-working-principle/

Units and conversion

https://kishorekaruppaswamy.wordpress.com/2018/01/05/units-and-its-conversion/

Specific gravity

https://kishorekaruppaswamy.wordpress.com/2018/01/05/specific-gravity-of-selected-liquidsgases-and-saturated-waterfor-different-temperatures/

Instrumentation Interview questions

https://kishorekaruppaswamy.wordpress.com/2018/01/03/instrumentation-interview-questions/

Temperature transmitter calibration

https://kishorekaruppaswamy.wordpress.com/2017/12/20/temperature-transmitter-calibration/

Pressure transmitter calibration

 

https://kishorekaruppaswamy.wordpress.com/2017/12/19/pressure-transmitter-calibration/

Magnectostrictive LT calibration

https://kishorekaruppaswamy.wordpress.com/2017/12/19/magnetostrictive-level-transmitter/

Hazardous area classification

https://kishorekaruppaswamy.wordpress.com/2017/12/17/hazardous-area-classification/

Excel short keys

https://kishorekaruppaswamy.wordpress.com/2017/12/16/excel-short-keys/

Digital electronics

https://kishorekaruppaswamy.wordpress.com/2017/12/14/digital-electronics/

Thermocouple mV conversion chart

https://kishorekaruppaswamy.wordpress.com/2017/12/14/thermocouple-temperature-mv-conversion-chart/

Foundation field bus

https://kishorekaruppaswamy.wordpress.com/2017/11/20/foundation-fieldbus/

Rosemount 3051 series transmitter

https://kishorekaruppaswamy.wordpress.com/2017/11/20/rosemount-3051-series-transmitters/

Hydrogen sulphide

https://kishorekaruppaswamy.wordpress.com/2017/11/20/hydrogen-sulphide-h2s/

Root cause Analysis

https://kishorekaruppaswamy.wordpress.com/2017/11/20/root-cause-analysis/

Shore Key Line up

https://kishorekaruppaswamy.wordpress.com/2017/09/28/how-to-line-up-interface-level-transmitter/

pH Analyser

https://kishorekaruppaswamy.wordpress.com/2017/09/27/ph-analyzer-working-principle-and-calibration/

Mathematic Formula

https://kishorekaruppaswamy.wordpress.com/2017/09/24/important-mathematical-formulas/

India

https://kishorekaruppaswamy.wordpress.com/2017/08/15/india/

Oil in Water Analyser

https://kishorekaruppaswamy.wordpress.com/2017/08/13/oil-in-water-analyzer/

BSW Analyser

https://kishorekaruppaswamy.wordpress.com/2017/08/13/bsw-analyzer/

Capacitive Level Transmitter

https://kishorekaruppaswamy.wordpress.com/2017/08/12/capacitance-type-level-transmitter/

LRV and URV Level Transmitter

https://kishorekaruppaswamy.wordpress.com/2017/08/11/lrv-and-urv-of-interface-level-transmitter/

Instrument Loop Diagram

https://kishorekaruppaswamy.wordpress.com/2017/07/28/instrument-loop-diagrams/

Laser Level Transmitter

https://kishorekaruppaswamy.wordpress.com/2017/05/20/laser-level-transmitters/

Turbine Flow Transmitter

https://kishorekaruppaswamy.wordpress.com/2017/05/20/turbine-flow-meter/

Zero Suppression and Elevation

https://kishorekaruppaswamy.wordpress.com/2017/05/18/zero-suppression-and-elevation/

Bently Nevada 3500 VMS

https://kishorekaruppaswamy.wordpress.com/2017/04/08/bently-nevada-3500-vms/

Control Valve Servicing

https://kishorekaruppaswamy.wordpress.com/2017/04/08/smp-of-a-control-valve/

Safety Integrity Level

https://kishorekaruppaswamy.wordpress.com/2017/02/23/safety-integrity-level-sil/

Instrumentation Working Principle

https://kishorekaruppaswamy.wordpress.com/2017/02/22/instrumentation-working-principle-continued/

Instrumentation Gland Sizes

https://kishorekaruppaswamy.wordpress.com/2017/02/15/instrument-gland-sizes/

LRV and URV of DP level transmitter

https://kishorekaruppaswamy.wordpress.com/2017/01/02/lrv-and-urv-determination-for-d-p-type-level-transmitter/

Instrumentation working principle continued

https://kishorekaruppaswamy.wordpress.com/2017/01/02/instrumenation-working-principle/

Level measurement using Pressure gauge

https://kishorekaruppaswamy.wordpress.com/2016/06/10/level-measurement-using-pressure-gauge/

Tips and tricks in field Instrumentation

https://kishorekaruppaswamy.wordpress.com/2016/04/18/tips-and-tricks-in-field-instrumentation/

Data Communication Protocol

https://kishorekaruppaswamy.wordpress.com/2016/03/10/data-communication-protocols/

Pressure Unit Conversion

https://kishorekaruppaswamy.wordpress.com/2016/02/19/pressure-unit-conversion/

Calibration of  GWR level transmitter

https://kishorekaruppaswamy.wordpress.com/2016/02/19/calibrationtheory-and-initialization-of-gwr-level-transmitter-rosemount-5300-and-ktek-5100/

Control Valves

https://kishorekaruppaswamy.wordpress.com/2016/02/18/control-valves/

ERS Level transmitter Parameters

https://kishorekaruppaswamy.wordpress.com/2016/02/18/calibration-and-initialization-of-electronic-remote-seal-level-transmitter-rosemount-3051ers/

Calibration of wet leg tube Level transmitter

https://kishorekaruppaswamy.wordpress.com/2016/01/16/calibration-and-initialization-of-wet-leg-impulse-tube-rosemount-3051cd-series-lt/

Calibration of capillary type Level transmitter

https://kishorekaruppaswamy.wordpress.com/2016/01/15/calibration-and-initialization-of-rosemount-3051cd-capillary-type-level-transmitter/

mV conversion chart

https://kishorekaruppaswamy.wordpress.com/2015/02/27/942/

Gulf JOB

https://kishorekaruppaswamy.wordpress.com/2013/09/18/contact-details-for-gulf-jobs/

 

Reynolds Number

https://kishorekaruppaswamy.wordpress.com/2012/11/28/reynolds-number/

Calibration of displacer type LT

https://kishorekaruppaswamy.wordpress.com/2012/11/16/calibration-procedure-of-displacer-type-level-transmitter/

My profile

https://kishorekaruppaswamy.wordpress.com/2012/06/20/click-here-then-photo-and-view-profile/

Chemical hazard pictogram

 

https://kishorekaruppaswamy.wordpress.com/2012/04/04/chemical-hazard-pictograms/

RTD conversion chart

https://kishorekaruppaswamy.wordpress.com/2012/02/17/calibration-of-dp-type-transmitter-with-actual-pressure/

Ingress Protection

https://kishorekaruppaswamy.wordpress.com/2012/01/18/ingress-protection/

 

To know more about Instrumentation and Control,

 

or

 

https://atomic-temporary-28241129.wpcomstaging.com/2012/09/30/basic-instrumentation-and-calibration/