Re: Thermo Fischer FHT 6020 Radiation Monitor

["Smith, Martin via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Keith,

Yes Brendan did create the StreamDevice EPICS support that we use at APS for about 30 - 40 units.

I believe that the displays we have are MEDM though. I helped him to set up the hardware interface 

for the IOC. One thing that we have found with these units is that if they see any vibration they will go 

into a local alarm although they do not trip the alarm relays. Not sure if the vibration is related to the 

probes or the control unit but I would suggest that you test this; we did not apparently and found out

after installation.

Another thing that we did here at APS was to create a RS232 device between the Moxa terminal 

server and the FHT 6020 to allow only certain commands through to the device since this is for radiation

safety. We did not want anyone to have the ability to remotely change settings on the FHT 6020 so

by design that must be done locally only by a qualified Health Physics (HP) technician. Brendan or I can

get you more information about this if you are interested.

APS HP group is currently looking at another device from Berthold but I don't recall which one it is. 

I can find out if you are interested though.

Marty Smith

APS / ASD Controls Group

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Baker, Keith (DLSLtd, RAL, LSCI) via Tech-talk <tech-talk at aps.anl.gov>
Sent: Friday, March 14, 2025 6:14 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Thermo Fischer FHT 6020 Radiation Monitor

 

Hello,

I have posted a few questions here in recent years asking about Radiation Monitors and had lots of helpful replies.

 

We are finally about to borrow a Thermo Fischer FHT 6020 for evaluation, so I would like to get an example EPICS IOC running.

I believe these monitors are in use or have been tested at ISIS, SLAC and Australia, perhaps elsewhere, so I was wondering who had the most up to date or complete driver they could share with me, please?

I found an asyn driver in SLACs EPICS repository and edl files. Is this my best choice to start with?

 

Does anybody use StreamDevice? (Brendan Chandler at APS mentioned this a few years ago.)

Has anybody created CSS opi files? (I could try running an eld->opi converter as a starting point.)

 

The monitor only seems to have an RS232 port, so I was wondering how different sites connect with this? Perhaps a local IOC with serial port, an RS232->RS485 adapter for more remote connections, or a local terminal server?

We don’t need to daisy chain the monitors. We’ll have dedicated wiring and IOC for each.

 

Any recommendations appreciated.

Thanks.

Keith Baker

Diamond Light Source

 

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