Hi,

My Honeywell ST3000 Pressure Transmitter sends more than 20 mA while the pressure is normal. Can anyone Help me? I don't have HART communicator to check the Fault Number.

 

My crystal ball is too hazy today and I failed clairvoyance 101 so I'll have to provide conventional reference material links.

The higher than 20mA output is the classic fail-safe mode, which indicates a critical fault.

The critical faults are listed in table 49 in the ST3000 HART users manual document # 34-ST-25-17, here:
http://tinyurl.com/qxp3hng
(Open the Documents tab, then read the listings carefully, the titles are deceptively similar)

If you get the parts to repair the transmitter, the critical fault needs to be cleared via HART after the repair, and the transmitter then needs to be re-configured. So you need HART access if you're going to attempt a resurrection.

If your transmitter is HART (check be sure, there lots of Honeywell DE models out there that are not HART), you do not necessarily need a HART handheld communicator to talk to it.

A USB HART modem costs 300 to 500 USD depending on brand and Pactware is a free Windows app. The DTM file that Pactware needs to talk to the ST3000 series can be downloaded from the Honeywell site, here:

https://www.honeywellprocess.com/en...mitters/st-3000-series-900/Pages/default.aspx

or here:
http://tinyurl.com/mmk9ajz

The DTM download file includes an installation guide and a link for Pactware download.

The replacement parts are a substantial percentage of the cost of new transmitter. Depending on how old the transmitter is and the service it's seen, it might be time to just get a new one.

 

Thank you for your beneficial information.

I downloaded all necessary files and Library of ST3000 and I have HART adapter. I can connect to some other transmitters from other manufacturers, but I can not connect to ST3000. I tried with 3 different PC2HART adapter. do you have any idea and can you advise me? and I downloaded 3 different Library of ST3000 including HART5, HART6 and Advanced HART Lib. how can I know which one is for my transmitter?

thank you for your consideration.

 

1) Did you check the code in model part number on the stainless ID label to confirm that the transmitter is HART and not DE? HART does not communicate with a DE transmitter.

Honeywell HART transmitters were shipped from the factory with Blue colored screw covers, but the tan/brown/beige screw covers interchange with the blue screw covers, so screw cover color is not proof of the transmitter's protocol.

2) The loop needs 250 ohms of resistance to support HART (or DE). If you're testing on the bench, you'll need a resistor in the loop.

3) Some Manufacturers customize their versions of Pactware. I believe E&H limits communication with only its brand transmitters unless a Software upgrade is purchased. I know Krohne and Vega Pactware versions talk to Honeywells without an upgrade or license fee.

4) Pactware DTMs install into a known location, but you have to initiate the installation from the downloaded file.
Once the DTMs install, then when you open Pactware, go to View > Device Catalog.

The Device Catalog window opens and you click the "Update Device Catalog" button at the bottom.

A pop-up screen asks, "Do you want to create a new Pactware Device Catalot", and you answer "Yes" (it adds any new DTMs to any exisiting DTMs in the catalog).

5) I don't know how you could tell whether your transmitter is HART 5 or HART 6. Install all the libraries. If there are duplicate DTMs they'll overwrite any existing DTMs. It's too bad Honeywell packs everything into one huge folder, but given their inability to post individual documents in a timely and reasonable manner, you have be thankful that the files are accessible at all.