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We must have found different manuals on the web. The manual I found for the Druck DPI 610 (User manual - K0415) shows that the Druck sources a pressure, powers a loop powered transmitter, and reads and displays the 4-20mA loop current. The wiring for powering the loop (current sourcing) from...

No, the DP across an orifice plate will diminish as the static pressure equilibrate in its closed volume when the valves are closed. Let me venture a guess as to why you're asking - a DP transmitter indicates a flow when the valves are shut off. Several things to consider: - the DP...

> There's no option with the card to turn off the flow control, Isn't flow control done in Windows by a setting in Device Manager? control panel > system > Hardware > Device Manager > ports > communications port COMx > port settings > flow control

The limitation is a HART 5 limitation, according to the HART Foundation's HART Communication Application Guide, my copy dated March 2010. "The multidrop mode of operation requires only a single pair of wires and, if applicable, safety barriers and an auxiliary power supply for up to 15 field...

The diagram on page 4 of the Modbus Application Protocol Specification V1.1b shows the client initiating a request, the server processing the request and initiating a response, and then the Client receiving the server's response. While the standard might not explicitly state that the master...

> 24v DC i/p is given from PLC I'm confused. An I/P should be connected to a PLC analog output that is compatible with the I/P's input; typically a 4-20mA output. If you are connecting 24Vdc to the I/P input, then remove the power supply. An I/P is not a 4 wire device designed to operate...

The Whessoe 01146 spec sheet says ATEX approval: - Category: Ex II 2(1)G - Marking: EEx d[ia]IIB T6 I read that as a flameproof design, EX d, with some element that is intrinsically safe [ia]. On a servo gauge, the I/S element is likely to be an I/S 4-20mA output. But apparently...

Intrinsic Safety is one approach to dealing with electrical apparatus in hazardous areas. Principles are covered in the vendors' engineering guides. Omega's Intrinsic Safety Circuit Design http://www.omega.com/temperature/z/pdf/z131-148.pdf MTL Cooper Crouse Hinds Principles of...

One might assume that any HART enabled analog input card would be able to deal with the primary variable from a field transmitter, just like a non-HART enabled AI card gets the process variable via a 4-20mA signal. The AI card's connection to the HART field device makes the AI card the portal...

In 30 years, I have never encountered a blind or illiterate PLC technician. If the techs at your plant can see and read, wouldn't a label on each rack, something simple along the lines of Rack 0, Rack 1 or Rack 2, eliminate the mystery of which rack is which?

The manual says that the module defaults to Modbus RTU on power-up (pg 45). The mode can be changed from Modbus to character based (pg 33). The AA characters (in the character string) represent the module address in the character based comm mode. That would indicate that character based...

The thermocouple law of intermediate metals says that junction terminal strips for thermocouples need not be made of thermocouple metals, as long as the terminals are isothermal and have no temperature difference between the terminals. Don't believe me, Google law of intermediate metal

A bulged out diaphragm is the condition that appears from hydrogen ion migration, when hydrogen ions on the process side pass through the diaphragm and recombine into hydrogen gas on the fill fluid side of the diaphragm. I've read warnings about the high nickel content of Hastalloy C276 and...

Software and RS-232 in today's world means using a USB/RS-232 converter, unless you're using an older PC. The software probably defaults to COM 1 and it's not likely that a USB/RS-232 converter is on COM 1. A USB converter's RS-232 COM port installs as a virtual COM port on a Windows box...

Moisture on the face of a transducer is a known problem with ultrasonics. The temperature of the air in the tank is below the dewpoint temperature of the relatively moist air over the water so water condenses. Some people tell me that applying a water repellent spray, like Rain-x, a...

> What do large EMS companies do when they have multiple devices from different companies to monitor? I'm just a one man show so I do it my way - I enter the slave ID number in the column next to the device's tag name in the spreadsheet. I even have a 'physical location' column. Seems to...

My memory of serial printers was that they needed flow control - small buffer memories and comparitively long execution times to empty the buffer onto paper (from quite some time ago). I haven't a clue how a serial/ethernet converter handles hardware flow control. Conversion to X-on X-off...

250 ohms is a low load value for an analog output. It only takes 5Vdc to drive 20mA through 250 ohms. If that's the active output capability of your AO, then, yes, that's why your positioner won't light up. 5Vdc < 9.7Vdc minimum required. The Load Power Supply ratings that you provided...

The Metso ND9000 spec says: Load voltage: up to 9.7 VDC/20 mA, (corresponding 485 ohms) So when you look at the PLC's analog output (AO) spec, you look for the load resistance that the AO can drive. Most active, powered, sourcing analog outputs will drive a loop resistance of at least...

>based on the FTDI chipset. I second the nomination of the FTDI chipset. Just today I installed a USB/RS-232 converter with an FTDI chipset on a Windows 7 box and it worked immediately, just like the others I've installed in the past 6 or 7 years. In contrast, last week a colleague got...