Combustion, Gas and Liquid Analysis, Flame & Gas Detection - Recent Threads

GC 370 XA can't start and there is information on the screen "Rebooting system due no found to connected database"

Hadi Familiyanto — Thu, 24 Apr 2025 07:26:25 GMT

Dear Sir

We would like to ask about the GC 370 XA not working and the screen says Rebooting system due to no found to connected database, what is the problem with this GC?

Please help and support solving this problem

Repeatibility and Linearity in 5081-A Transmitter

farzan — Tue, 18 Jul 2023 22:42:10 GMT

I want to use 5081-A Transmitter along with 499ATrDO Dissolved oxygen sensor.

Our required calibrated range is 0-20 ppb.

In the transmitter 5081 datasheet (LIQ_PDS_5081/Rev.R Page#6) under the heading of General Specifications for 5081-A, it is defined as following:

Repeatibility (Input) = 0.1% of range

Linearity (input)= 0.3% of range

and above some input ranges are given in current units.

Now, we know that the sensor 499ATrDO has the range of 0.1 to 20 ppm (i.e. 20,000 ppb), so does it meant that the repeatability of the transmitter will be 0.1% of 20,000 ppb? and similarly linearity will be 0.3% of 20,000 ppb? This will result in a very high values for repeatability and linearity as our working range is only 20 ppb. Can you please explain this doubt?

Regards

RE: Repeatibility and Linearity in 5081-A Transmitter

farzan — Thu, 27 Jul 2023 01:58:25 GMT

HI Jacalyn

Thanks for the response.

What i understand that we need to consider the repeatability and linearity of transmitter and sensor both. in this case, if your point is take that Repeatibility is 0.1% of Range (which is 20,000 ppb) then the value comes out to be 20 ppb which is an extremely high value for a calibrated span of 20 ppb.

What would you suggest that the customer should consider this much error in the reading if he keeps the span to 0 to 20 ppb?

Regards

RE: Repeatibility and Linearity in 5081-A Transmitter

Jacalyn Saint Rudolph — Wed, 26 Jul 2023 21:31:05 GMT

The 499ATRDO sensor PDS dated 2019 has the following specifications (see pages 3-4):

Rosemount 499ATrDO (emerson.com)

The repeatability is 2% of reading at constant temp, and linearity is either 5% of reading or 3ppb, whichever is greater.

The 5081-A PDS, to the best of my understanding, refers to the full range. So even if you say you will calibrate to 20 ppb, it is declared as 0.1% of the transmitter range. Furthermore, it seems to have been written such that it applies to any amperometric sensor, whereas the specifications above is intended specifically for 499ATRDO.

RE: Use of Flame Simulator Model: FS-IR-975 and FS-HR-975

Brenna Roseth — Wed, 07 Dec 2022 14:45:55 GMT

While it is possible to have the FS-HR-975 carry out both scenarios for the 975HR and 975MR, it is only made to work within specification for the 975HR. The 975MR will likely still detect the simulator for the HR, but distances, ranges, sensitivities, etc. will not line up and may not work as expected. It is recommended to use the appropriate flame simulator for the corresponding detector for best performance.
- Kevin Stultz, Global Product Manager

Use of Flame Simulator Model: FS-IR-975 and FS-HR-975

Rodrigo Sandoval — Tue, 29 Nov 2022 18:46:08 GMT

Dear Experts

Flame Detector 975MR has a range of 4μm and 5μm to detect hydrocarbon-based fuel and gas fires

Flame Detector 975HR has a range of 2μm and 5μm to detect hydrogen fires

In order to have in stock just one flame simulator I want to acquire the Flame simulator model FS-HR-975 where according with the spectrum range is able to simulate Methane and Hydrogen spectrum.

I wonder if it's possible with one flame simulator FS-HR-975 carry out both scenarios?

I look forward to your advice and comments

Best regards

Rosemount™︎ 3300HTVP PERpH-X™︎ High Performance pH and ORP Sensor

Ahamed farid — Tue, 02 Nov 2021 08:43:22 GMT

Dears,

We use 3300HTVP pH to neutralize inclinator waste acidic liquids. Sensor is mounted directly to the process. There is no option for effluent disposal. The sensor is get damaged very frequently typically one or two weeks. I doubt some small particulates damaging the glass electrode. Operation maintain high flow for mixing chemicals. They are expecting pH reading with no lag. Kindly give a solution.

Kind Regards

Daniel Senior Fitting with Profiler plate

brian remley — Sun, 03 Oct 2021 23:36:00 GMT

Anyone has noise issues at flow rates coming from the conditioning plate or orifice fitting?

RE: Daniel Senior Fitting with Profiler plate

brian remley — Wed, 06 Oct 2021 23:10:10 GMT

Martin, so I looked up the Profiler but the information i see says "obsolete", I don't see anything for a replacement. I understand Daniel has or is changing ownership, not sure if this is now part of the problem. Do you have recommendations for a replacement?

RE: Daniel Senior Fitting with Profiler plate

brian remley — Mon, 04 Oct 2021 21:00:08 GMT

Thank you for this information

RE: Daniel Senior Fitting with Profiler plate

martin schlebach — Mon, 04 Oct 2021 15:43:56 GMT

Initially flow conditioning plates did not have the holes beveled which caused the gas to collapse behind the plate causeing noise at certain velocities. For the Daniel Profiler this as the standard for Orifice runs as it was thought that the noise wouldn't interfere with the measurement as it would with USMs. However the noise levels far exceeded the OSHA levels and as such all FCs had their holes beveled on the downstream as a minimum. CPA also found the same issues with their 50E and beveled the inlet and outlet of each hole as a standard. The plates will still generate some noise but the levels are below the 80 dB levels.

RE: Daniel Senior Fitting with Profiler plate

John Stephens — Mon, 04 Oct 2021 14:41:29 GMT

Definitely at high flow rates. I don't usually get too concerned with the noise unless it has an "odd" tone or the noise level increases and flow rates have not significantly changed. These usually mean that something is caught in the flow conditioner and a tube inspection is needed.

RE: Daniel Senior Fitting with Profiler plate

martin schlebach — Mon, 04 Oct 2021 14:29:34 GMT

a flow conditioning plate will generate noise if the holes are not chamfered, for orifice meters the Daniel Profiler was not initially chamfered since any noise created would not effect measurement. However as you have found out it's very annoying and the processes were changed to include breaking the edges of the downstream potion of the holes. Even with the chamferring there can be some noise generated at certain velocities.

RE: P/N clarification for PCA MAIN CPU for 700XA GC

Nishant Thankappan — Thu, 03 Jun 2021 12:44:28 GMT

Dear Otabek,

Please note that the part is interchangeable.

2-3-0710-007

Replaced by 7A00055G02 - XA CPU Board

Best regards,

Nishant

Nishant Thankappan | BDM – Analyzer Solutions & Detection

Emerson Automation Solutions | PO Box 17033 | Dubai | United Arab Emirates

T +971 4 811 8363 | F +971 4 886 5465 | M +971 529123807 | Nishant.Thankappan@Emerson.com

P/N clarification for PCA MAIN CPU for 700XA GC

Otabek N. Fayzullaev — Thu, 03 Jun 2021 12:19:38 GMT

Dear Sir,

Pls. confirm the part number interchangeability of PCA MAIN CPU for 700XA GC: "2-3-0710-007" vs. "7A00555G02".

Best regards,

Otabek N. Fayzullaev

Gas chromatography daniel 500

Mohammed .M — Fri, 23 Apr 2021 10:21:23 GMT

as chromatography

Dear all
we had issue regarding the Daniel® Danalyzer Model 500. Gas Chromatograph. failure C6 hexan,C2 please note the below.

Observed While we are facing issue with GC 500 (Error and Range out of limit in and deviation RF alarm Hexane, Ethane , Propane is showing Zero). What the step to solve this Issue

So kindly support to fix this issue .

RE: Gas chromatography daniel 500

Khadra Helminski — Fri, 23 Apr 2021 14:47:33 GMT

Hi Mohammed,
Thank you for contacting us. To troubleshoot the problem, our application support engineers may need more information about the analyzer. Please send a request to our support team at GC.CSC@Emerson.com and they will advise on the next steps to solve the problem.

best regards,
Khadra

RE: Converting Emerson 700XA Gas Chromatograph Status Signals to Modbus Holding Registers

jamie marsden — Thu, 04 Mar 2021 16:51:57 GMT

Hello Zazar, Please confirm what you mean by PID loop? Is this with regard to a Modbus function in our software?

Converting Emerson 700XA Gas Chromatograph Status Signals to Modbus Holding Registers

Shaiq Bashir — Mon, 08 Feb 2021 17:06:26 GMT

Dear Emerson Support

We have one 700XA Gas Chromatograph on which some of the boolean status are configured on Modbus Coil addressss (10000-19999). Some of the boolean status are as following:

No Sample Flow

Analyzer Failure

Low Carrier Pressure.

The flow computer that we have interfaced with this chromatograph supports only Holding Registers (40000-49999). Is it possible to change such status signals in Gas Chromatograph modbus map to Holding Registers?

RE: Converting Emerson 700XA Gas Chromatograph Status Signals to Modbus Holding Registers

zazar — Thu, 04 Mar 2021 12:11:42 GMT

hello you tell me how create pid loop

RE: Converting Emerson 700XA Gas Chromatograph Status Signals to Modbus Holding Registers

jamie marsden — Fri, 12 Feb 2021 12:56:25 GMT

Great, Thank you for confirming.

RE: Converting Emerson 700XA Gas Chromatograph Status Signals to Modbus Holding Registers

Shaiq Bashir — Fri, 12 Feb 2021 07:33:29 GMT

Thanks Jamie, it did the job.

RE: Converting Emerson 700XA Gas Chromatograph Status Signals to Modbus Holding Registers

jamie marsden — Mon, 08 Feb 2021 17:36:41 GMT

Hello Shaiq Bashir,

This can be done by changing the data type in the Modbus map from Boolean to Int , or create a new register of type int at an unused register address.

RE: gas chromatography

Nishant Thankappan — Sat, 28 Nov 2020 07:53:16 GMT

Hello Mohammed, please send send me an email with your contact details (nishant.thankappan@emerson.com) and we will reach out to you to understand the issue.
Will it be possible to share the sample and calibration CGM and report to see the peak separations and RF?
We also need GC configuration file to see the Time events etc.

Thanks and regards,

Nishant Thankappan

gas chromatography

Mohammed .M — Fri, 27 Nov 2020 16:15:41 GMT

Dear all
we had issue regarding the Daniel® Danalyzer[emoticon:7d377b609b6f44bf9290e3d8a0b9a733] Model 500. Gas Chromatograph. failure C6 hexan, please note the below.

Observed GC Hexane issue showing 0 value. While troubleshooting when it is calibrating from calibration gas Hexane value coming exactly 0.2 % alarm not coming. When it is keeping through Sample line Hexane value going to zero value again alarm giving in DCS and SVR also Hexane low value. Remaining all gas composition are coming exactly.

So could you please advise form emrson or roemont