How we can measure the our FF signa

Question

How we can measure the our FF signa

arslansharif (Industrial)

(OP)

3 Nov 17 19:02

How we can measure the our FF signal .means if i am calibrating a PT honeywell 800 how can i measure my output iscorrexct to the input .e.g in hart if my PT is 0 to 100bar i have give input 50bar i can measure 12mA output and in FF how i can measure with out any communicater e.g hart 475

danw2 (Industrial) · Answer 1 · 2017-11-03 20:54:27

I presume the ST800 has no local display.

Buy a local display. Unscrew the screw cover on the PT. Install the display. Configure the display using the LCD transducer function block. Read the values in the display.

arslansharif (Industrial) · Answer 2 · 2017-11-05 04:55:03

No i have std 810 which have display i want to measure the output FFwith any standard instrument .

danw2 (Industrial) · Answer 3 · 2017-11-05 15:00:48

Foundation Fieldbus has no analog output. That's why it's called a fieldbus.

I've heard that the communications modules are interchangeable on the ST800. The parts list from the user manual would infer that as well.

So if you're determined to get an analog HART output from the PT, convert it to HART with a replacement Comm module and terminal block.

If this exercise is to check calibration, using the display on the FF unit is as good a value as you'll get, because the local display shows digital values; the same value FF is providing the host. The ST series local display communicates to the xmtr digitally; the local display is not an analog local meter like the older tan/beige Honeywell's.

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How we can measure the our FF signa