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Assuming you know which wiring terminals are used for the 4-20mA output, a field test will confirm whether it is an active or passive output. Use a DVM set on the DC milliameter setting. Connect the DVM probes to the two analog output terminals. If the meter shows any current in the...

It depends. A four-wire device is usually (and historically) an active output, powered by the device's internal DC power supply. But many of the 4-wire Coriolis meters (Coriolis is line powered, not loop powered) of the last decade offered a choice of active or passive 4-20mA outputs...

An LR250 should read the echo from a high dielectric liquid like water. A couple things come to mind. The LR250 is designed for liquid level measurements. The LR260 is designed for solids level measurements. Are you sure you have an LR250? Does the stainless steel nameplate say SITRANS...

Modbus serial communications has its own standard/document https://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf

My mistake, I thought the LR460 was the device at the top, but it isn't, that's the AI. You are correct in connecting the HART communicator as shown in your graphic in post #5.

1. Wiring The HART communicator should not be part of the loop or 'inside' the current loop. The HART communicator wants to see the voltage drop across the loop resistance; the communicator is not designed to pass loop current (I hope it hasn't been damaged by your trying to drive loop current...

Be aware that there is an entire category of 2-wire loop powered devices that constitute a major exception to the use of a 24Vdc-power-supply-on-the-inputs rule: 2-wire, loop powered valve positioners. Connecting a 24Vdc power supply directly to the (+)/(-) input terminals of a 2-wire loop...

No, the sensor will not fail. A 2-wire, loop powered field transmitter will power up and operate, regulating the loop current (in proportion to how it is configured and whatever it senses) when a 24V dc power supply is connected, with the correct polarity. This is frequenty done on a bench...

check out the example for temperature and pressure compensation for a single loop controller, here link

The diagram below from an Emerson valve document, link for a 6352 or 6353 regulator installation shows that 'bottom side' of the regulator diaphragm (or the left side in this particular illustration) is at atmospheric pressure. If the removeable vent is leaking fuel, then the diaphragm is...

An RTD AI card generates a constant current and detection of the interruption/opening of the current circuit and reporting a fault is quite common. RTDs can intermittently fail internally due to expansion from heat where the fault can be intermittent and disappear when the RTD cools.

If you're talking about displaying video by referring to HDMI ports, then that's out of my HMI experience. If you're talking about displaying a static graphic, then most graphical HMI's (as opposed to text only) have some means of displaying a static graphic image on the screen. Calling the...

Can you confirm that when you bench tested and got correct operation of the flowmeter, you were not using lined pipe? Is the converter remote mounted or mounted on the flowtube? If remote, is the cable connecting the flowtube to the converter factory cable or a substitute? Is the converter AC...

The purpose of a control valve is to create a pressure drop to regulate the outlet pressure or the flow rate, depending on application. One means of dropping pressure is to use a smaller-than-line-size valve body and given that smaller-than-line-size valve bodies cost less, a...

> since the fouling of level gauge and associated piping is not a result of freezing Is the wax formation that causes the fouling a result of the chemistry going on in the processs?

The UP arrow key: The procedures are slightly different between the 2500 and 3200. I don't have a document for original 3000 (the model in the thread title). Here are images of the text (this forum did not allow images back in 2010) UDC 3200 reset-to-defaults

> There's another tank of the same dimension with the same model radar transmitter. It's also in water service and works fine still now. What about swapping the bad boy radar with the working radar on the other water tank and vice versa? If the tanks and radar nozzles are the same, the...

You can't find a specification value for a magmeter's electrode resistance because no one cares what that value is except the manufacturer's electronics designer. What are you really asking about? The minimum conductivity of the liquid in the magmeter tube? That's a number spec'd by the...

Very interesting that the spike = 2^32 counts. I seriously doubt that any commercial flow meter flow signal works 4.2GHz. Every one I've encountered uses a flow rate frequency rate in the low KHz range (up to 10KHz or less). There's no way the flow rate pulse train = 2^32 counts for one...

It isn't clear what causes the spike value in the flow rate or where that fault occurs in the system. A flow rate spike from a pulse/frequency signal would have to be either a momentary high frequency pulse train that is electrically within the range of the flow computer's sensing input that...