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DP transmitter's Low side port connects to vapor/vacuum port. DP transmitter's High side port connects to the output of the N2 differential relay (constant flow regulator) anywhere along the line (can be at the top of the dip tube). Specific Gravity: 1129 kg/m3 / 1000 kg/m3 = 1.129...

That documentation is positively, pathetically poor. You're just going to have to experiment and compare what you read to what the device is currently configured as. There are two 0002 register addresses. Two different values cannot reside in the same 0002 register so the 'digital' is a...

I can tell you that Honeywell's 1st generation XYR5000 wireless base station had all values mapped to Holding registers as 32 bit Floating point values, even boolean values. It certainly appears that those values are mapped to the 4xxxx Holding Register memory area, even the switch and...

It is likely interpreted like this: The possible ranges can use spans from 100-2000 mbar. That means ranges can be from 0-100 mbar up to 0-2000 mbar A range of 0-200 mbar falls within the usable turndown range of the device.

The prolinxgateways site is gone, the link 404's. Arcom is so involved in IIoT that it would be a major project to find a HART-Modbus converter box. The Microcyber G0310 is a Modbus Master that populates HART variables so the HART side is a HART slave. Interesting concept if one has a...

I think Modscan (win-tech.com) still has a trial period to see if it works for you. Modscan's monitor mode interprets two of the 64bit FP formats, circled in red in the operating window, with 3 FP values in the monitor window (not connected, so values are not populated)...

Nice catch, Fred. I work so seldom in K, it never occurred to me.

Assuming your (4)0035 register is a signed, single integer and its interpretation is value * 10^-2, then 3102 = 31.02, which is not the same as 37.1 There's frequently an issue with one offset in the register addressing depending on whether registers are zero based or one based addressing...

Chipkin's Modbus for Field Technicians http://www.chipkin.com/files/liz/MODBUS_2010Nov12.pdf draft of Ron Hulsebus' forthcoming book - Modbus: The Manual http://www.enodenetworks.com/assets/docs/ModbusManualDraft.pdf Introduction to Modbus using (National Instruments) Labview...

Did you check under "ports" in Windows Device Manager to see which virtual COM port the replacement USB adapter installed on? The new one is likely a different COM port.

I misread your original post thinking it was a positioner on a modulating valve. When you mentioned 'servo' I realized it is different application. As to response rate, yes, a different PV response rate will affect the PID. The sensor's spec sheet should tell you what response the new one...

The device is known as a "positioner". I'd recommend not using the word 'transmitter' because that infers you're looking for an optional re-transmission signal representing the valve position back to the control system (which I don't think is the case). "Smart" positioners have a self...

A flow transmitter measures and reports the flow rate. A PLC does not control a flow transmitter because the flow transmitter just a flow rate reporter. A valve (in the pipe line) controls the flow. An actuator moves the valve stem to position the valve in order to adjust to a different flow...

A capillary seal pressure measurement is, by definition, a closed, filled system which is as much a thermometer, reflecting temperature changes, as it is a pressure measuring system. Capillary seal DP level measurements are inherently subject to error due to temperature variation. Even if...

FlowMate web site is pretty sparse on technical details; I could find a manual. The word 'Modbus' doesn't appear on the EcoZone page. The spec sheet mentions RS-485, it does have the word "Modbus," so the 485 bus might be for BacNet or some proprietary protocol. A 16 bit word probably infers...

No, connection like that is not possible, unless the device labeled splitter/repeater/hub is a specialized, custom programmed device designed to control the 485 bus traffic. The published Rule is that Modbus RTU over RS-485 can have one and only one master. Without a specialized bus...

And I took it the other way. Who knows? Maybe there'll be a reply that clarifies.

I presume your question is about process instrumentation, not test and measurement or scientific instrumentation. 1. Go download Tony Kuphalt's free pdf instrumentation training book from the link below https://www.ibiblio.org/kuphaldt/socratic/sinst/ It's massive, 3300 pages, quite...

Some analog-to-digital converter is needed for an analog field device to talk to a serial port. The SLC Programming will depend on the digital protocol that the converter uses. Modbus is a typical field device protocol. When the SLC500 was an active (not obsolete product), there was no...

If you read the replies, the OP discovered that the input circuit was looking for a voltage that a pot across a fixed voltage would supply. So one approach is to use a voltage input for that situation. Some other commercial solutions: 1. Motorized potentiometer Micronor MR267...