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Win-tech Modscan32 (run 5 minutes for free) http://www.win-tech.com/html/modscan32.htm Simply Modbus http://www.simplymodbus.ca/ Chipkin Modbus Scanner http://www.chipkin.com/cas-modbus-scanner take out any spaces the forum inserts into the URL

Rosemount (and others) sell battery powered wireless HART pressure transmitters that are also low power radios. Originally (2 years ago) I understood that the maximum sampling rate for direct connection (not through a repeater) to the wireless gateway is 4 seconds. That might have changed over...

More than you ever wanted to know about impulse tubing & installation: 1) Instrumentation Tubing and their Connections http://tinyurl.com/85vvrs4 http://preview.tinyurl.com/85vvrs4 2) Best Practice Guide Impulse Lines for Differential Pressure Flowmeters http://tinyurl.com/2colxrg...

The Kulite paper cited above, that provides calculations for using impulse tubing to isolate pressure transmitters has a new URL: http://www.kulite.com/docs/technical_papers/AN8401HeatTube.pdf (take out any spaces the forum inserts into the URL)

More than you ever wanted to know about impulse tubing installation: http://www.scribd.com/doc/12725993/23/Best-practices-for-impulse-tubing-installation page 34 A single instrument sensing line should not be used to perform both a safetyrelated function and a non safety-related function...

The issue of resistance in a HART loop typically arises when a new or replacement transmitter is fired up on the bench, not in the field where there's already a shunt/load resistor on the analog input. On the bench, the tech connects power supply leads to the transmitter signal terminals and...

Your stated range has changed from -0.1 to 0.4 bar (in the first post) to -0.4 to 0.1 bar. Make sure you know which range you're dealing with. >In the manufacturer specs for the ABB 261GS, its mentioned the min span for the instrument is 1.5 bar. My range, being - 0.4 bar to 0.1 bar, has the...

All pressure measurements are inherently differential, every pressure measurment is compared to a reference pressure. Absolute pressure references absolute zero (a hard vacuum) Gauge pressure references the local atmospheric pressure Differential pressure references whatever pressure...

A remote seal transmitter with filled capillaries is subject to pressure indication error induced and due to changing temperature, because each capillary and seal is a filled, closed system. I suspect that the difference in length of the capillaries might be an attempt to minimize the...

>What is the meaning of On-Off differential for Pressure switches & Temperature switches? Differential is more often called 'deadband' to avoid confusion with 'differential pressure', but I hear both terms are used in conversation. Deadband is the difference between the trip...

I don't know what that Moxa is or does and Moxa requires registration to see a spec sheet. Sorry, I can't help you.

Yes, you need a 250 ohm resistor to get 1-5Vdc signal for an analog input, but that's not why HART requires 250 ohms. When a transmitter is fired up on the workshop bench, the transmitter will light up and do its functions while connected directly to a suitable DC power supply with zero load...

What the engineering book formulas leave out is that the calculations for a real world calibration are based on the percentage of design maximum flow rate and the percentage of DP at the max flow rate. The square root calculation is done on a percentage value, not on a pressure value (in any...

Sometimes you just have to read the manual. Examples using RSLogix5000 are shown as screen shots. http://tinyurl.com/7l6s2wz

1) If your probe can talk Modbus, the documentation will say "Modbus". If it doesn't say "Modbus", there's no Modbus. 2) Modbus is master/slave protocol. If your instrument does talk Modbus (questionable at this juncture) it would be a Modbus slave. To make Modbus work, your data...

The failure to drive the output to 10V at 20mA is a classic symptom of insufficient voltage from the power supply. The operating voltage needed depends on the total loop resistance. The documentation for most 2 wire loop powered transmitters has either a chart that shows voltage versus...

The era when a transmitter integrated into a recorder has been gone for 30 years. Nowadays there are differential pressure transmitters and there are recorders, but they are separate devices. Get a standard 4-20mA output (not Fieldbus or Profibus) on a DP. The DP is 'loop powered' with a...

Interesting what's buried in a manual. I wonder whether the 475's 'simulate' mode includes modulating the HART output connection line during a simulation. It might or might not, since the assumption of a simulation is that the handheld is not connected to anything. So even if you 'force'...

Lots of selection out there. 1) Banner Engineering calls the field radios (device-1) node radios. "Flexpower" Node radios can be DC powered or battery powered. The central receiver radio with the Modbus output is called a Gateway radio (only one needed). Their Performance line of...