# \#instrumentation **URL:** https://forumautomation.com/tag/instrumentation/17.md [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) --- ## [CHANGES MADE BY THE TRANSDUCER IN OUR TECHNOLOGY](https://forumautomation.com/t/changes-made-by-the-transducer-in-our-technology/5986)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [February 25, 2019, 12:50pm UTC](https://forumautomation.com/t/changes-made-by-the-transducer-in-our-technology/5986 "2019-02-25T12:50:27Z")
\*\*TRANSDUCER\*\* A transducer is an electrical device which converts one form of energy to another. Transducer deals with different types of energies such as mechanical, light energy, chemical, … --- ## [How to program a VFD?](https://forumautomation.com/t/how-to-program-a-vfd/14334)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [August 21, 2026, 2:07pm UTC](https://forumautomation.com/t/how-to-program-a-vfd/14334 "2026-08-21T14:07:56Z")
How to Program a VFD: Step-by-Step Guide A simple guide to VFD programming—from checking wiring and entering motor nameplate data to setting speed reference, acceleration/deceleration, and performing a safe test run. Id… --- ## [Online pH Analyzer Shows 4.3 While Laboratory Measurement Shows 6.9](https://forumautomation.com/t/online-ph-analyzer-shows-4-3-while-laboratory-measurement-shows-6-9/14319)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [August 13, 2026, 4:25pm UTC](https://forumautomation.com/t/online-ph-analyzer-shows-4-3-while-laboratory-measurement-shows-6-9/14319 "2026-08-13T16:25:45Z")
Online pH Analyzer Shows 4.3 While Laboratory Measurement Shows 6.9 A wastewater tank normally operates at pH 7.0. The online pH analyzer suddenly indicates 4.3, while laboratory testing shows 6.9. The transmitter output… --- ## [What is a Modbus list?](https://forumautomation.com/t/what-is-a-modbus-list/14241)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 10, 2026, 8:00am UTC](https://forumautomation.com/t/what-is-a-modbus-list/14241 "2026-07-10T08:00:25Z")
What is a Modbus list? --- ## [Double Acting Cylinder Control Valve Actuator Slow Response](https://forumautomation.com/t/double-acting-cylinder-control-valve-actuator-slow-response/14229)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 5, 2026, 8:35am UTC](https://forumautomation.com/t/double-acting-cylinder-control-valve-actuator-slow-response/14229 "2026-07-05T08:35:20Z")
Double Acting Cylinder Control Valve Actuator Slow Response A refinery uses a 12-inch globe control valve with a double acting pneumatic cylinder actuator to regulate reactor feed flow. During normal operation, the DC… --- ## [Radar Level Transmitter Showing False High Level During Heavy Rain](https://forumautomation.com/t/radar-level-transmitter-showing-false-high-level-during-heavy-rain/14204)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 27, 2026, 5:05am UTC](https://forumautomation.com/t/radar-level-transmitter-showing-false-high-level-during-heavy-rain/14204 "2026-06-27T05:05:44Z")
Radar Level Transmitter Showing False High Level During Heavy Rain I’m facing a strange issue with an 80 GHz radar level transmitter installed on a diesel storage tank. During heavy rain, the level suddenly jumps fro… --- ## [Pressure Transmitter Signal Fluctuating Randomly](https://forumautomation.com/t/pressure-transmitter-signal-fluctuating-randomly/14206)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 27, 2026, 5:04am UTC](https://forumautomation.com/t/pressure-transmitter-signal-fluctuating-randomly/14206 "2026-06-27T05:04:49Z")
Pressure Transmitter Signal Fluctuating Randomly I’m dealing with an intermittent issue on a pressure transmitter. The process pressure is stable, but the transmitter output randomly fluctuates for a few seconds befo… --- ## [Flowmeter Showing Zero but Product Is Flowing](https://forumautomation.com/t/flowmeter-showing-zero-but-product-is-flowing/14207)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 20, 2026, 4:53am UTC](https://forumautomation.com/t/flowmeter-showing-zero-but-product-is-flowing/14207 "2026-06-20T04:53:23Z")
Flowmeter Showing Zero but Product Is Flowing We have a magnetic flowmeter that suddenly started showing zero flow on both the local display and DCS. Operators can clearly see that product is moving through the line, an… --- ## [Why does a control valve fail even after calibration?](https://forumautomation.com/t/why-does-a-control-valve-fail-even-after-calibration/14175)
**Author:** [@autoviks](https://forumautomation.com/u/autoviks)\ **Replies:** 0\ **Last updated:** [June 6, 2026, 5:53am UTC](https://forumautomation.com/t/why-does-a-control-valve-fail-even-after-calibration/14175 "2026-06-06T05:53:36Z")
Hi all, I’ve come across situations where a control valve still doesn’t perform properly even after proper calibration. In some cases, the valve shows issues like unstable flow, delayed response, or incorrect positioni… --- ## [Explain the Benefits of the 2080-LC20-20QBB Controller in Industrial Automation](https://forumautomation.com/t/explain-the-benefits-of-the-2080-lc20-20qbb-controller-in-industrial-automation/11670)
**Author:** [@shraddha123](https://forumautomation.com/u/shraddha123)\ **Replies:** 1\ **Last updated:** [June 6, 2026, 5:50am UTC](https://forumautomation.com/t/explain-the-benefits-of-the-2080-lc20-20qbb-controller-in-industrial-automation/11670 "2026-06-06T05:50:17Z")
The selection of an appropriate control system may have a significant impact on improving productivity, streamlining procedures, and guaranteeing uninterrupted operations in the quickly changing field of industrial aut… --- ## [Why Did HART Multiplexer Fail During PLC System Migration?](https://forumautomation.com/t/why-did-hart-multiplexer-fail-during-plc-system-migration/14126)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 28, 2026, 1:29pm UTC](https://forumautomation.com/t/why-did-hart-multiplexer-fail-during-plc-system-migration/14126 "2026-05-28T13:29:30Z")
A refinery upgraded its aging Distributed Control System to a modern PLC based automation platform while keeping the existing smart transmitters and HART multiplexer infrastructure for diagnostics and predictive maint… --- ## [Why Ratio Control System Caused Reactor Temperature Fluctuation?](https://forumautomation.com/t/why-ratio-control-system-caused-reactor-temperature-fluctuation/14127)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 28, 2026, 1:28pm UTC](https://forumautomation.com/t/why-ratio-control-system-caused-reactor-temperature-fluctuation/14127 "2026-05-28T13:28:41Z")
Why Ratio Control System Caused Reactor Temperature Fluctuation? A chemical plant used a ratio control system to maintain the correct proportion between reactant A and catalyst flow entering a reactor. The process nor… --- ## [Why Wrong I/O List Created Major Commissioning Delay?](https://forumautomation.com/t/why-wrong-i-o-list-created-major-commissioning-delay/14128)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 28, 2026, 1:27pm UTC](https://forumautomation.com/t/why-wrong-i-o-list-created-major-commissioning-delay/14128 "2026-05-28T13:27:56Z")
Why Wrong I/O List Created Major Commissioning Delay? An EPC contractor was executing a large refinery automation project involving more than 2500 instrumentation signals connected to a new DCS and Safety Instrumente… --- ## [What is the difference between 4 20mA and HART?](https://forumautomation.com/t/what-is-the-difference-between-4-20ma-and-hart/14115)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 22, 2026, 5:00pm UTC](https://forumautomation.com/t/what-is-the-difference-between-4-20ma-and-hart/14115 "2026-05-22T17:00:09Z")
What is the difference between 4 20mA and HART? --- ## [Is it okay to bypass a safety device?](https://forumautomation.com/t/is-it-okay-to-bypass-a-safety-device/13955)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [March 27, 2026, 5:38pm UTC](https://forumautomation.com/t/is-it-okay-to-bypass-a-safety-device/13955 "2026-03-27T17:38:58Z")
Is it okay to bypass a safety device? --- ## [Mag Flowmeter Showing Zero Flow – What Do You Check First?](https://forumautomation.com/t/mag-flowmeter-showing-zero-flow-what-do-you-check-first/13813)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 2\ **Last updated:** [January 6, 2026, 10:39am UTC](https://forumautomation.com/t/mag-flowmeter-showing-zero-flow-what-do-you-check-first/13813 "2026-01-06T10:39:43Z")
Mag Flowmeter Showing Zero Flow – What Do You Check First? An electromagnetic flowmeter on a cooling water pipeline suddenly indicates zero flow, even though the pump is running and the process is clearly flowing. Power… --- ## [Which flow meter can reliably measure water flow despite the presence of pelleted material in the water?](https://forumautomation.com/t/which-flow-meter-can-reliably-measure-water-flow-despite-the-presence-of-pelleted-material-in-the-water/12150)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\ **Replies:** 3\ **Last updated:** [December 29, 2025, 10:08am UTC](https://forumautomation.com/t/which-flow-meter-can-reliably-measure-water-flow-despite-the-presence-of-pelleted-material-in-the-water/12150 "2025-12-29T10:08:55Z")
What type of flow meter would measure water flow regardless of pelleted material flowing through the water? Which type of flow meter would accurately measure water flow in a 3" diameter pipeline, despite the presence o… --- ## [Vortex flow meter](https://forumautomation.com/t/vortex-flow-meter/3041)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:04am UTC](https://forumautomation.com/t/vortex-flow-meter/3041 "2025-12-29T09:04:49Z")
Vortex flowmeters are used to measure pressure in the pipeline, creating vortices in the flow channel using a stationary object (Bluff body). The vortex flowmeters are used for measuring gases and liquids in pipeline … --- ## [Vortex flowmeter](https://forumautomation.com/t/vortex-flowmeter/2876)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:03am UTC](https://forumautomation.com/t/vortex-flowmeter/2876 "2025-12-29T09:03:08Z")
When a fluid moves with high Reynolds number past a stationary object (a “bluff body”), there is a tendency for the fluid to form vortices on either side of the object. Each vortex will form, then detach from the object … --- ## [Which is better thermocouple compensation cable or extension cable?](https://forumautomation.com/t/which-is-better-thermocouple-compensation-cable-or-extension-cable/13741)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [December 6, 2025, 2:27pm UTC](https://forumautomation.com/t/which-is-better-thermocouple-compensation-cable-or-extension-cable/13741 "2025-12-06T14:27:50Z")
Which is better thermocouple compensation cable or extension cable? --- ## [What is a flame scanner in a boiler?](https://forumautomation.com/t/what-is-a-flame-scanner-in-a-boiler/13742)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [December 6, 2025, 2:26pm UTC](https://forumautomation.com/t/what-is-a-flame-scanner-in-a-boiler/13742 "2025-12-06T14:26:47Z")
What is a flame scanner in a boiler? --- ## [Can I Use a Normal Shielded Cable Instead of Thermocouple Extension Wire for Connecting a Thermocouple?](https://forumautomation.com/t/can-i-use-a-normal-shielded-cable-instead-of-thermocouple-extension-wire-for-connecting-a-thermocouple/13740)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [November 28, 2025, 10:05am UTC](https://forumautomation.com/t/can-i-use-a-normal-shielded-cable-instead-of-thermocouple-extension-wire-for-connecting-a-thermocouple/13740 "2025-11-28T10:05:15Z")
Can I Use a Normal Shielded Cable Instead of Thermocouple Extension Wire for Connecting a Thermocouple? --- ## [Inaccurate Flow Measurement in Electromagnetic Flow Meter](https://forumautomation.com/t/inaccurate-flow-measurement-in-electromagnetic-flow-meter/12247)
**Author:** [@automation\_engineer6](https://forumautomation.com/u/automation_engineer6)\ **Replies:** 3\ **Last updated:** [November 27, 2025, 8:33am UTC](https://forumautomation.com/t/inaccurate-flow-measurement-in-electromagnetic-flow-meter/12247 "2025-11-27T08:33:47Z")
Symptoms: The flow meter reading is erratic or significantly deviates from the expected flow rate. The flow meter shows zero flow when there is actual flow in the pipe. The displayed flow rate fluctuates rapidly. --- ## [What are inert electrodes?](https://forumautomation.com/t/what-are-inert-electrodes/12683)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [October 14, 2024, 12:57pm UTC](https://forumautomation.com/t/what-are-inert-electrodes/12683 "2024-10-14T12:57:17Z")
What are inert electrodes? --- ## [What are the two standards for cable termination?](https://forumautomation.com/t/what-are-the-two-standards-for-cable-termination/13513)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [September 7, 2025, 11:56am UTC](https://forumautomation.com/t/what-are-the-two-standards-for-cable-termination/13513 "2025-09-07T11:56:25Z")
What are the two standards for cable termination? --- ## [Basics of PLC timers | Types of PLC timer](https://forumautomation.com/t/basics-of-plc-timers-types-of-plc-timer/2568)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 4, 2017, 5:52pm UTC](https://forumautomation.com/t/basics-of-plc-timers-types-of-plc-timer/2568 "2017-11-04T17:52:12Z")
PLC timers are instructions that provide the same functions as on-delay and off-delay mechanical and electronic timing relays. A PLC timer provides a preset delay to the control actions. In general, there are three type… --- ## [Performance Concerns in Industrial Pressure Measurement: WIKA’s Pressure gauge](https://forumautomation.com/t/performance-concerns-in-industrial-pressure-measurement-wika-s-pressure-gauge/13427)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [August 9, 2025, 6:57am UTC](https://forumautomation.com/t/performance-concerns-in-industrial-pressure-measurement-wika-s-pressure-gauge/13427 "2025-08-09T06:57:54Z")
WIKA is a well-known brand around the world for pressure measurement, yet some users have complained about some of their pressure gauges. One problem that keeps coming up is that gauges breakdown because of mechanical… --- ## [What is Hydra Step Drum Level Indicator?](https://forumautomation.com/t/what-is-hydra-step-drum-level-indicator/13369)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 26, 2025, 6:22am UTC](https://forumautomation.com/t/what-is-hydra-step-drum-level-indicator/13369 "2025-07-26T06:22:42Z")
What is Hydra Step Drum Level Indicator ? --- ## [Is 4-20mA signal AC or DC?](https://forumautomation.com/t/is-4-20ma-signal-ac-or-dc/13329)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 19, 2025, 5:17am UTC](https://forumautomation.com/t/is-4-20ma-signal-ac-or-dc/13329 "2025-07-19T05:17:08Z")
Is 4-20mA signal AC or DC? --- ## [How to amplify Pneumatic Signal?](https://forumautomation.com/t/how-to-amplify-pneumatic-signal/2707)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 23, 2017, 3:08pm UTC](https://forumautomation.com/t/how-to-amplify-pneumatic-signal/2707 "2017-11-23T15:08:17Z")
Pneumatic signal: In a pneumatic system, information is carried by the pressure of the gas in a pipe. Raising the pressure at the one end will propagate down to the other end such that in a system transducer varies th… [Next page](https://forumautomation.com/tag/instrumentation/17.md?match_all_tags=true&page=1&tags%5B%5D=instrumentation)