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Several years ago an Emerson rep noticed that a DP was close coupled to the manifold for an averaging pitot tube and was concerned that the conducted heat would degrade the performance and kill the transmitter. But it had already run satisfactorily for some time. Emerson investigated wrote up...

Spray paint the tube black with 'exhaust' spray paint and use IR to measure the skin temperature.

> is transferred data manipulated like this? Yes. The precision of a measurement or calculation can be lost if a that value has to be represented merely as a whole number, so scaling factors are very commonly used to provide greater precision in the interpretation of the data. It is not...

Whoops, my mistake. You are reading from the correct default register. I finally found the regular manual with the default slave register map and the internal temperature is indeed at 31003 The key is that the register value is an integer that is 50 times the display value, which is...

You're probably reading the wrong register. From http://www.datanab.com/docs/MBus_IO/MBus_IoFlash/help/index.html (what appears to be the documentation for the programming for unit) "Modbus Register Addresses The modbus registers use a 16 bit signed integer data format by default, which...

Modbus is a protocol, a set of rules for transferring real-time data from the slave to the master/client or what you call a host. Modbus accomplishes data transfer when the Master sends a Function Code (FC) command to the Slave. The Function Code typically 'reads' some data from the slave by...

Your link is for an Output board that might (maybe) could drive a valve actuator, depending on the actual actuator. It also has various motor drive outputs. Pressure needs to be measured with a pressure transducer/transmitter whose electrical output signal will be read by your Arduino as an...

Temperature values frequently have a low scale or high scale burn-out or failsafe value setting, and it's common to see that when a sensor is disconnected because disconnection is a fault/bur-out/failsafe condition. But burn-out is full scale up value or full scale down value; it is not a 32...

Data types/formats There are four IEEE784 formats for 32bit floating point (real) values (a value with some number of digits to the right of the decimal point). A 32 bit word consists of four 8 bit bytes. A Modbus register, frequently called a 'word' in Modbus vernacular, is 16 bits. If one...

A command is a Function Code sent by the Master/Client. I would interpret a limitation of "10 commands per second" as meaning that the master/client can not execute any given Function code command more often than every 100mS. Executing another Function Code command 100mS after another would...

At least one vendor of piezo-resistive technology smart pressure transmitters 'characterizes' each sensor element over the range of spec'd operating temperature while applying various reference pressures and recording the resulting pressures, which is the unique characterization data set for...

For a potential future purchase of hundreds I'd think you'd run own evaluation installing a one of each side by side in the same tank and determine the installation, setup, operational and performance differences for yourself, and do a test on one a tank considered "problematic". If you...

Are you using the term 'wet leg' for a remote seal DP transmitter? Probably not, one doesn't 'pump up' seal capillaries without some dedicated effort (vacuum evacuation and backfill). It isn't clear to me how you have a wet leg on the level's process bottom side that does not pollute itself...

The STD924 has a factory range of 0-1,000mbar (LRL = 0.0mbar, URL = 1,000mbar) with a 100:1 turndown for a potential minimum span of 10mbar, or 0-10mbar (LRV = 0.0mbar, URV = 10mbar). Configuring the range depends on the exact model. Most ST3000 series had Honeywell's embedded DE protocol...

What material is in the vertical impulse lines between the orifice plate and the transmitter?

Good job, Curt. I second all your suggestions. They go right to the heart of the problems that show up here time and time again.

Here's what the 3051 manual says about saturation level: 2.9.1 Configuring alarm and saturation levels In normal operation, the transmitter will drive the output in response to pressure from the lower to upper saturation points. If the pressure goes outside the sensor limits, or if the...

The Sepam manual gives part numbers for digital connecting cables (RJ45). I have no idea whether those cables are conventional Ethernet cables or not. The analog output signal connection from the options board to the PLC analog input can be any shielded twisted pair cable. Whatever the...

If you're talking star topology, you must be talking multidrop RS-485. Multidrop over RS-485 is supposed to have very short "stub" wiring at a node junction where the 485 signal comes in, Tees to the device, and then goes out again to the next device down the line. The stub Tee...

No, you do not use any RS-485 communication module for a 4-20mA output signal. 4-20mA is an analog signal which uses the MSA 141 analog output module Your statement, "to use the MS 141 communication module and the Modbus RS 485 2 wires interface and configure the relay by entering the...