# \#field-instrument
**URL:** https://forumautomation.com/tag/field-instrument/1.md
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## [Resistance measurement; 2, 3 or 4 wire connection – How does it work and which to use?](https://forumautomation.com/t/resistance-measurement-2-3-or-4-wire-connection-how-does-it-work-and-which-to-use/10459)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\
**Replies:** 0\
**Last updated:** [June 6, 2022, 6:01am UTC](https://forumautomation.com/t/resistance-measurement-2-3-or-4-wire-connection-how-does-it-work-and-which-to-use/10459 "2022-06-06T06:01:08Z")
What is 2 wire RTD? A single wire connects each end of the RTD element in a two-wire RTD. It’s the simplest wire arrangement. The computed resistance will encompass all elements of the circuit, implying a higher margin …
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## [Electromagnetic flow transmitter Troubleshooting](https://forumautomation.com/t/electromagnetic-flow-transmitter-troubleshooting/1959)
**Author:** [@shah](https://forumautomation.com/u/shah)\
**Replies:** 5\
**Last updated:** [December 29, 2025, 9:20am UTC](https://forumautomation.com/t/electromagnetic-flow-transmitter-troubleshooting/1959 "2025-12-29T09:20:35Z")
I have krohne IFC 050 magnetic flow convertor in service which measure flow of sodium sulphite. IFC 050 Convertor does not show flow measurement in his display when pipe have flow. No scaling problem. I clean electrode b…
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## [Maintaining pH Meter Accuracy: Importance and Methods of Verification](https://forumautomation.com/t/maintaining-ph-meter-accuracy-importance-and-methods-of-verification/11747)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\
**Replies:** 0\
**Last updated:** [January 31, 2024, 6:27pm UTC](https://forumautomation.com/t/maintaining-ph-meter-accuracy-importance-and-methods-of-verification/11747 "2024-01-31T18:27:17Z")
The primary pH meter validation and verification tests are: 1). Calibration 2). Accuracy 3). Precision 4). Linearity 5). Stability 1). Calibration The pH meter must be calibrated before usage for reliable readin…
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## [How fingerprint scanner works and how to choose the best fingerprint scanner?](https://forumautomation.com/t/how-fingerprint-scanner-works-and-how-to-choose-the-best-fingerprint-scanner/10460)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\
**Replies:** 0\
**Last updated:** [June 7, 2022, 3:34am UTC](https://forumautomation.com/t/how-fingerprint-scanner-works-and-how-to-choose-the-best-fingerprint-scanner/10460 "2022-06-07T03:34:45Z")
What is a fingerprint scanner? A fingerprint scanner is a device that uses a person’s fingerprints to identify and authenticate them in order to grant or deny access to a computer system or physical place. It’s a biomet…
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## [What are the Modbus request commands?](https://forumautomation.com/t/what-are-the-modbus-request-commands/2428)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Replies:** 0\
**Last updated:** [October 11, 2017, 1:49pm UTC](https://forumautomation.com/t/what-are-the-modbus-request-commands/2428 "2017-10-11T13:49:43Z")
Modbus masters sends request commands to modbus slaves, requesting slaves the datas on field variables or to write data to the slaves, not every request messages are the same. Major types of request command of modbus mas…
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## [How to store your Instruments properly?](https://forumautomation.com/t/how-to-store-your-instruments-properly/1266)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\
**Replies:** 0\
**Last updated:** [August 20, 2016, 7:11pm UTC](https://forumautomation.com/t/how-to-store-your-instruments-properly/1266 "2016-08-20T19:11:22Z")
Storage of Field Instruments. If you dont store your instruments properly it will malfunction during the operation. During shelf-life it should be stored properly. This steps are very important for instrument spare part…