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Lots written the topic: https://lmgtfy.com/?q=electric+actuator+duty+cycle It's not just duty cycle, it's also starts per hour and maximum on-time http://www.onyxvalve.com/uploads/docs/Duty_Cycle.pdf

Only the MRT model, DP technology, is used for dual remote seals for level. GRT is gauge pressure and ART is absolute pressure, neither of which is suitable for dual remote seals for level measurement. The document you reference is a spec sheet that does not have installation information on...

The IFX-2000 module spec sheet https://www.tokyokeiso.co.jp/english/products/download/tg/IFX-20000_TG-LD618E.pdf lists 11 proprietary protocols (of which Modbus is NOT one) used to communicate to field tank level gauges. You could check with the OPC server vendors to see if any of them have...

My Ethernet experience shows that the inability to ping a device means a packet/message will not get through. Have the rule changed.

Your accuracy value of 0.035% looks like a DP transmitter accuracy spec, which is different than the primary flow element's accuracy spec. It would highly unusual to find a DP meter run claiming 0.035% accuracy. Your report probably takes into account the combined DP and primary flow element...

You can calculate all you want, but the key factor is slave wake-up and response time, so in the end, the throughput rate is empirical - it is what it is at a given baud rate. And it assumes 100% functionality - one slave going off line invokes the master's time-out, which extends the total...

1. This RS-485 hub device appears to allow for a star type network by replicating the message at the RS-485 input on each of the four RS-485 outputs. Multiple hubs can be daisy-chained for more than 4 RS-485 outputs. I have not used this device; I just am aware of it...

You've got some great bedtime reading to look forward to. "Instrumenation Tubing and Their Connections" an ebook by Nirbhay Gupta http://www.scribd.com/doc/12725993/Instrumentation-Tubing-and-Their-Connections-Nirbhay-Gupta This is a blog on tubing installation...

Wika has Bimet thermometers with optional ATEX cert: ATEX directive Hazardous areas Ignition protection type “c” with instrument category 2G and 2D (marking, see instrument) https://en.wika.com/upload/DS_TM5402_en_co_94665.pdf

Vibration. Corrosion. Sabotage.

This is a conditional issue which depends on - the actuator (single vs double acting) - the PS-2 model - the control signal/power to the positioner according to Siemens PS-2 app note, "SIPART PS2 Valve Positioner Fail Safe Positions, ADPS2-2", June 2015 (there are earlier versions). PS-2...

A google search shows me that SynEnergy is an entire software suite of products for Oil & Gas, obviously licensed software. I have no knowledge of it, but when you mention DCS, it likely the DCS that uses Modbus to talk to whatever instrumentation is in the field, rather than SynEnergy dealing...

Krohne is an established, first tier, instrumentation manufacturer. Whichever 'system' you are dealing with, Krohne's documentation undoubtedly covers its Modbus Server/Slave functionality. What does the documentation say?

Sorry, but forum will not format in Courier fixed spacing, so the columns do not work. The data below is your message, decimal in one column, hex in the next column but the formatting is just all mashed together. Your decimal string: 15 0 2 0 1 1 0 field Decimal Hex Function...

What do you need a manual for? It's rare to find an ID label with that much configuration data. It's obviously a temperature controller. It's got two outputs, and since the heat/cool box isn't checked it's heat only. So follow the cable to the final control element to see whether it's relay...

If the existing controller does not have electrical values and a comm protocol for getting at the values, then you need to research 'industrial power monitors' (Google is your friend). The monitors all have some kind of industrial communications protocol (Modbus, Profibus, Ethernet/IP). Buy...

In my world, Modbus over USB is the exception, not the rule, so the devil, like always, will be in the details. Answer to your question number 1, I've never run into anyone using Modbus over USB. 1. I have no idea how you've implemented 'On each serial port a Modbus Master is created...

You haven't said why this project needs Modbus communications. You might be better off with manual control - using a multi-turn potentiometer to control the VFD output. If your approach is to "take an ethernet cord, cut off on end, and try to plug the data twisted pairs into the VFD" I think...

You are correct on several counts - the importance of fluid displacement and the need for understanding the importance when matching a diaphragm seal to a pressure element. The spec sheet for the seal lists its displacement. A distributor can probably find the pressure gauge displacement...

I suspect that the term 'fail' might well mean that the gauge will not meet its accuracy spec, for one reason or another, as opposed to failing to hold pressure. It could be that some 'unseen' component, like the grease used on the gauge internals is only rated to -40F. Grease gets to viscous...