[dsg-hallb_gas] ALERT absolute pressure transmitter

[Brian Eng]

It can be converted after the fact (we usually do it on the cRIO itself rather than in EPICS), but if you know you want to read in a particular unit it saves a step to just get one that uses that. Since nothing they have outputs in mbar might as well get the 0-5 psig one since it has the lowest full scale.

I’d recommend getting 626-06-GH-P1-E4-S1

Which has a 4-20mA output rather than 0-10V, as the current output ones require only a 2-wire cable instead of 3 and you can tell if they’re disconnected or just reading 0 pressure.

On Feb 5, 2024, at 10:25 AM, Bob Miller via dsg-hallb_gas <dsg-hallb_gas at jlab.org> wrote:

Hi Marc,

I see your 626-08-GH-P1-E4-S5, and raise you to 626-06-GH-P1-E4-S5.  🙂

The one listed below for the LTCC is for the supply pressure.  The ALERT will run at about 1050 mbar, or 0.7 psi, so a 0-5 psi PT will be more accurate.

Can you convert the psi to mbar in Epics?  If not, then change to a -67 which is 0-0.5 Bar.


Thanks,
Bob
________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Monday, February 5, 2024 8:36 AM
To: Bob Miller <rmiller at jlab.org>; Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas at jlab.org>
Subject: Re: ALERT absolute pressure transmitter

Hi Bob,

Will the Dwyer 626 pressure sensors work for you?

Marc

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________________________________
From: dsg-hallb_gas <dsg-hallb_gas-bounces at jlab.org> on behalf of Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas at jlab.org>
Sent: Friday, February 2, 2024 12:45:52 PM
To: Bob Miller <rmiller at jlab.org>; Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas at jlab.org>
Subject: [dsg-hallb_gas] ALERT absolute pressure transmitter

Hi Bob,

I am waiting for the formal quote for the Alicat MFCs to put in the req. I am planning on ordering 3 +1 spare.

For the pressure transmitters, I think the ones we use on the LTCC should work:

 Dwyer 626-08-GH-P1-E4-S5<https://dwyer-inst.com/series626-628.html?utm_term=go_cmp-18506241757_adg-139893866097_ad-626055067638_kwd-298421221333_dev-c_ext-_prd-_mca-_sig-Cj0KCQiAwvKtBhDrARIsAJj-kTj7AJHIs3Q663ibWhQVIxmJguS_BFSyVF93XVi7n_V10KfmXr4VVykaAoJXEALw_wcB&utm_campaign=626+%26+628+-+Dwyer+Brand+Keywords&utm_source=google&utm_medium=cpc&hsa_acc=4712969374&hsa_cam=18506241757&hsa_grp=139893866097&hsa_ad=626055067638&hsa_src=g&hsa_tgt=kwd-298421221333&hsa_kw=dwyer%20pressure%20transducer&hsa_mt=b&hsa_net=adwords&hsa_ver=3&utm_content=brand&gad_source=1&gclid=Cj0KCQiAwvKtBhDrARIsAJj-kTj7AJHIs3Q663ibWhQVIxmJguS_BFSyVF93XVi7n_V10KfmXr4VVykaAoJXEALw_wcB>
accuracy = 0.25% of full scale
0 - 30 psig
1/4" NTP
0 - 10 V output

Let me know if this works for the system and I will order 3  + 1 spare.

Marc


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