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D
Antivirus and Microsoft security patch update in control systems
It is my impression from discussions with DCS operators that Honeywell periodically releases authorized updates as part of their paid/subscription services after having tested the updates . If you don't have paid service for your system then the testing is your responsibility.
David_2
Post #2
Nov 28, 2021
Forum:
General Automation Chat
D
Krohne Flowmeters - Low flow cutoff
No direct experience with "low flow cutoff in Krohne systems" but I'll make several observations The graphic appears to be an HMI batch screen. Are you saying that this a Krohne software/HMI product? If so, which one? There are any number of stand-alone batch controllers and who knows how...
David_2
Post #2
Nov 23, 2021
Forum:
Instrumentation & Measurement
D
Modbus for a Newby
The value is a 32 bit floating point (FP) value consisting of four 8 bit bytes. There are four IEEE754 word/byte order formats to produce a 32 bit FP value, as shown in the graphic below from vendor documentation. The terminology varies by vendor, some call it "endianness". Out of the...
David_2
Post #6
Nov 17, 2021
Forum:
General Automation Chat
D
Industrial grade headlamp
In the US, the hard hats seem to have a molded 'slot' on the each side. There are a number of LED flashlights that are designed to fit into the slot on the side of the hardhat. There are hundreds of models with straps that fit around a hard hat. There are even lamps rated for hazardous areas...
David_2
Post #2
Nov 16, 2021
Forum:
Safety
D
Foundation Fieldbus device communication establishment process explained for the layperson
At this link https://control.com/textbook/foundation-fieldbus-instrumentation/h1-ff-data-link-layer/ there's some discussion of comm management, albeit without any sample packets, just descriptive commentary. FF is not like the Modbus protocol where the standards are public and there are...
David_2
Post #2
Nov 16, 2021
Forum:
Distributed Control Systems - DCS
D
Orifice plate flowmeter
AGA 3.1 Orifice Metering of Natural Gas https://law.resource.org/pub/us/cfr/ibr/001/aga.3.1.1990.pdf
David_2
Post #3
Nov 16, 2021
Forum:
Sensors & Calibration
D
Thermocouple type
The description at the top right of the drawing, 2nd arrow down, "Type E Terminal head" is a fairly good indication that the element is a Type E.
David_2
Post #4
Nov 11, 2021
Forum:
Instrumentation & Measurement
D
How do devices archieve floating voltage?
A voltage measurement is inherently a differential measurement, the difference in potential between point A and point B, red probe (+) with respect to the black (COM) probe. It's easier to make voltage measurements 'above or below' ground with a battery powered, plastic-cased voltmeter because...
David_2
Post #2
Nov 9, 2021
Forum:
Electrical Engineering
D
Pressure Transmitter 4~20mA and 0-10V signals
Yes, a current loop signal is 'the same' throughout the loop, at the source and at the destination. Voltage signals 'drop' voltage over distance.
David_2
Post #2
Nov 8, 2021
Forum:
Instrumentation & Measurement
D
I have an issue in selecting the perfect location to install a Level Transmitter in a conical tank consists of agitator.
a sketch would help. Draw it with dimensions and take a photo of your sketch with your cell phone.
David_2
Post #2
Nov 5, 2021
Forum:
Instrumentation & Measurement
D
What is a "Flow meter adalah"?
In English, word order is important and if you'd written adalah flow meter (instead of Flow meter adalah) I would have proposed: A) Another flow meter vendor by the corporate name Adalah B) After residing in the Commonwealth of Massachusetts for 7 years, I could easily propose that a New...
David_2
Post #2
Nov 2, 2021
Forum:
General Automation Chat
D
Anyone have some experiences with Flowmeters?
You really need the E&H Promass 80 configuration manual: https://tinyurl.com/2ubt7xkm The Quick Setup Group navigation menu is shown on page 14. The System Units group is first, followed by the Measuring Mode Group. E&H calls the URV the "Value 20 mA", as shown in the Measuring Mode group...
David_2
Post #5
Nov 2, 2021
Forum:
Instrumentation & Measurement
D
Send ohms via such long cables...
An RTD input circuit does not 'send Ohms'. Most RTD analog inputs drive about 1mA of constant current through the RTD resistance and then read the voltage drop. A 150 Ohm resistance generates only 150mV of IR drop, a fairly low level signal to read over hundreds of meters of lead wire which...
David_2
Post #4
Nov 2, 2021
Forum:
Instrumentation & Measurement
D
Anyone have some experiences with Flowmeters?
It occurs to me that the situation is a number of flowmeters are being commissioned. The spreadsheet has a column for each point that has a 'maximum' expected flow rate. The flow meter has a 4-20mA output which is to be configured for 125% of that maximum flow rate so that in case the...
David_2
Post #4
Nov 2, 2021
Forum:
Instrumentation & Measurement
D
Anyone have some experiences with Flowmeters?
I'm lost. I've done lots of flow meters but I don't know what "max flow over 120%" means. Are you measuring gas or liquid? What is communication output of the flow meter? A digital protocol or 4-20mA? The typical flow restriction on a coriolis meter is when the pressure drop gets too high...
David_2
Post #2
Nov 1, 2021
Forum:
Instrumentation & Measurement
D
Pneumatics connectors, thread, sizes
This site illustrates differences between tapered NPT and BSPT threading and describes the straight thread BSPP. https://www.geminivalve.com/bsp-thread-vs-npt-fitting/ What the majority of tapered threaded fittings are depends on where in the world you are.
David_2
Post #2
Nov 1, 2021
Forum:
General Automation Chat
D
Radio communication status
a signal conditioner, ±5V input with a relay output, like the one here: https://api-usa.com/pdf/api/api1080g-1090g.pdf
David_2
Post #2
Oct 28, 2021
Forum:
General Communications Chat
D
Pressure and temperature compensation valve
You should be communicating with the manufacturer of the brand and model that you've tried, explaining how the valves you purchased don't function properly and inquiring as which models the vendor offers that can solve your problem.
David_2
Post #6
Oct 27, 2021
Forum:
Control Valves
D
Do inductive motor fields damage laptop's SSD (vs HDD)?
3-4 years ago, I would turn on my laptop when I got to work and go get a cup of coffee in the break room because it was a full 5 minutes before Windows desktop appeared and the HDD LED went from solid on to occasional blinking. The IT guy asked me if I wanted to change over to a SSD drive...
David_2
Post #3
Oct 27, 2021
Forum:
Motion Control
D
Pressure and temperature compensation valve
Link
David_2
Post #2
Oct 27, 2021
Forum:
Control Valves
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