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Check out Veris Accelabar which uses proprietary nozzle and pitot technology for flow conditioning so that it needs no upstream or downstream flow conditioning. Wide turndowns require multiple DP transmitters. I do not know how low temperatures are handled (more on the DP sampling side than...

I thought maybe a steam guy would answer this, but if no one in 6 days tries, I'll offer some observations. I'm not a steam guy I've only gotten involved to some extent when someone put a DP flow meter on a steam line. Here are several steam issues I've run into or heard of. 1. Does the...

There must be a dozen text books out there. Search for process instrumentation text. I've noticed that there's a trend towards 'renting' for a semester, which is the rental of a printed version for the one or two I looked at. Bela Liptak's 3 volume set of "Instrument Engineer's Handbook(s)"...

When you expect a number, and there's a problem you have to use numbers to investigate the problem. You have provided no numbers. Is the value a total, like liters? or 1,000's of liters? What value/number do you get that does not meet your expectations? What number did you expect? Why would a...

You're probably already aware that all devices on a Multidrop RS-485 network need to use the same serial settings, baud rate, parity stop bit, and data word size and each device needs a unique Slave ID. It appears that these devices do not have a mechanical means of changing the serial...

It sounds to me like there's a fault in the field wiring going back to the I/O card, that fault being 'high voltage' on the wrong wire that easily destorys the I/O module. a. Inspect the repair of the damaged cable for isolation of each conductor from the other and continuity of the color...

Assuming a pneumatic actuator and positioner, the cause can be either a malfunctioning positioner/valve/actuator or a mistuned loop is providing a control signal that is 'hunting'. If the valve tracks the input signal with precision and the loop hunts, then the tuning is too agressive. If the...

How timely an inquiry. An article from 2 months ago on this site addresses that very topic: https://control.com/technical-articles/the-difference-between-wet-and-dry-contacts/the-difference-between-wet-and-dry-contacts/

Go to this page https://www.asco.com/en-us/Pages/solenoid-valves.aspx#/#flt=e30%3D - click on Operating Environment and check Hazardous - click on Voltage and check 12DC - click on Standard and Regulations and check a rating to see the number of 12VDC solenoid valves available for hazardous...

RS-232 is point-to-point ONLY, so it can only be used for single master, single slave. Multiple slaves need to run on a multidrop RS-485 bus. A master with an RS-232 port would need an RS-232/485 converter for a multi-drop RS-485 network. RS-485 bus wiring is 'daisy chain' wiring: Rx to Rx...

Those terms have no standardized meanings. They are marketing terms, so it depends on how the vendor uses the terms. Honeywell uses the term 'High Level analog input' for 0/4-20mA or 0/1-5Vdc analog inputs. With respect to those levels, thermocouple mV or an RTD circuit are "low level"...

Thanks for the update. The Tecweigh Tecnetics' web site did not list communications manuals, only the basic FC20 controller user manual.

I'm curious what value representing which variable did you write to (4)1025? I can't make sense out of 1025 from the register listing in the manual provided.

>There was a marsharing cabinet (I actually saw that stenciled on Yokogawa PLC cabinets at a couple of sites in Malaysia--marsharing That made my day. You can't make this stuff up. Life is stranger than fiction.

As udshred points out, you need to decode the model number which is stamped on the nameplate, which Rosemount refers to as ordering information in their manuals. The digit after the 3051CD is the range code, as shown in the screen shot from the manual. If you power it up and check it via...

The older OPC DA reported data when the data moved outside a noise band around the last reported point; data within the noise was not reported. I missed that webinar on the basics of OPC UA, but I'll assume OPC UA does the same thing as OPC DA. Your explanation does not mention missing data...

Use the on-line Modbus poll user manual at the link above. Scroll down to section 5 Read/Write Definition where it shows the set-up parameters and right at the top is the Slave ID setting.

In other HMI products, an X-Y plot is produced by specifying one array for the X axis and another array for the Y axis. Historically, it was called an X-Y plot, as opposed to a Y-t trend.

There is no means of assigning a slave ID in Modbus Poll because Modbus Poll is a Modbus Master/Client program. on-line Modbus poll user manual Modbus master/client software applications NEVER have a slave ID because they are not slaves. You need a Modbus Slave application if you need to...

I'm on page one, and you're page 8. The typical application for DRS is hydrostatic liquid level measurement, where the slave goes up top and measures the vapor space pressure (in your case a vacuum) and the master is mounted down low and measures the combined vessel pressure and hydrostatic...