Obsolete Items


These are parts and analyzers that are no longer available or have become obsolete.  RIGAS is often able to still service these items, though.

Obsolete Items

As of September 30, 2023, the Rosemount 400A has been officially obsoleted by the OEM (Emerson – Rosemount Analytical) with NO OEM PARTS or FACTORY SUPPORT.   There is good news though;  RIGAS plans to support this analyzer for at least the next ten (10) years, and maybe longer.  If you are an end-user, you can help us help you by NOT throwing away good components (boards, regulators, etc.).  Everything is repairable.  Here are a few examples:

1. Main Electronics Board (pre-2009 vintage) – rarely fails. Shipping sometimes causes the big transformer to be ripped off the board

Fixable. We have new transformers.

2. 4-20 mADC card gets noisy or fails outright

Usually a few capacitors dry out causing the “charge pump” to misbehave. We replace the capacitors and fully test the board (includes linearity checks).

3. Backpressure regulator – the rubber diaphragm dries out, becomes brittle, and then it doesn’t regulate pressure very well.

We install a new diaphragm and relap the valve seat; the result is near PERFECT operation (very little seat leakage and great pressure control).

4. Ribbon cables – they get pinched or scraped.

We build our own cables.

5. Sample capillary – it gets clogged over time causing a lack of sensitivity.

It can be cleaned but we’d rather just replace the old capillary (and possibly reuse your old fitting);  capillaries are just soldered into a Parker-Hannifin, tube-end reducer, stainless steel fitting using a Silver bearing solder.

Additionally, if your application is unique, we can build a unique capillary.

6. Thermal insulation – it becomes unglued.

We replace the insulation where needed and/or reglue the old insulation.

7. Burner jet gets fouled causing false flame problems or noisy readings.

We make our own jets.

8. Burner contact gets old and brittle, and eventually breaks causing a total loss of analyzer functionality.

We make our own burner contacts (a.k.a., Hot Dogs).


So, in other words, just about everything is repairable.  So, let’s partner up and keep your analyzer running!

A side note:  Emerson-Rosemount does NOT have a replacement analyzer for the 400, 400A series.  RIGAS is toying with the idea of building a replacement analyzer and calling it the RIGAS 400R.  It will be VERY similar to the Rosemount 400A but maybe a little easier to operate.  We plan to change the display to read “ppm” rather than percent (%) of scale.  It will also have built in diagnostics for those key parameters that we always ask you about when you call in for technical support.  In the meantime, RIGAS does recommend the Teledyne 4020 THC analyzer (or one of the sister units, like the 4040).


This is a PROPOSED REPLACEMENT for Rosemount’s obsolete 42716489-V1 source. The 42716489-V1 became NLA (no longer available) August 2023. This was primarily due to the OEM’s closure of its Hasselroth Germany facility. RIGAS is taking advance orders for this item; the first batch is expected to ship mid December 2023 or sooner.

ORIGINAL INFORMATION ABOUT 42716489-V1: This is an infrared source (IR) for the MLT microchannel physics benches. Typically used for CO and CO2 measurements. Two wires. Reads approx. 20 ohms when new. Encapsulated (includes hermetically sealed BaF2 window and nitrogen filled cavity) infrared source with parabolic mirror;  with wire harness (two conductors) and plug (5 pins connector (2 wires, 2 blanks, 1 key; connects to PIC01 or XSP01). See specification sheet – cut sheet.

If you’re looking for somebody to at least attempt to repair your aging Signaflex Type RR Indicator-Controller then call us.  I have used these controllers when I worked at a power plant years ago.  I’ve attached a manual that I obtained recently.

You’ll probably discover that Bailey has been bought up by ABB.  ABB has purged all old information about this product line so you (we) are on our own.

This item usually NEVER fails. It’s an infrared (IR) emitting LED (light emitting diode) that is glued in to a holder specifically designed for the NGA-2000 PMD analyzer (paramagnetic oxygen analyzer).

You might be looking for the old P/N 778521 … this is no longer available from the OEM.   RIGAS manufactures a replacement case heater asembly (p/n: 65B0001).   Our unit uses a Dywer Instruments digital temperature controller which makes it more accurate and more stable than the original analog controller board.   Our assembly includes: heater, digital temperature controller, fan, RTD, bracket, power cable (harness), installation instructions, thermal fuse, and fan guards.  No new mounting holes are required;  our unit has the same footprint as the 778521 assembly.    One wire (for heater “on” indication) has to be relocated.

We build these on demand; it can take a week or two to manufacture.

The price from the OEM back in 2003 was approximately $1100.  Our unit sells for $1500.

Call us at 877-616-0600  and ask for p/n: 65B0001!!

This is an old mechanical, rotary drum & rocker switch, stream switcher. It was designed as a 5 streams or 10 streams unit.

Here are some part numbers that you might find in this unit:

  • 138515 operator’s manual,
  • 138520 operator’s manual,
  • 123770 front panel,
  • 117956 SLIDE RAIL,
  • 081810 manual.

This analyzer has fallen off of the proverbial radar! In its day, this was a very good analyzer. The main failure problem is its ZrO2 (zirconium oxide) sensing cell.

This analyzer was commonly referred to as “Ox in a box” (i.e., zirconium oxide based oxygen in a rack mountable chassis).

The unit was fabricated in Shannon, Ireland (a Rosemount factory back in the 70s, 80s, & early 90s).

The Rosemount OPM-2000 series opacity analyzers have been discontinued by the OEM since circa 2010. We had a good run of maintaining these analyzers to keep them viable for many years beyond their discontinuance but now we are at the point where we can’t purchase or produce parts. Call us to talk about replacement analyzers!

If you are contemplating a wholesale replacement of your COMS, remember to look at the following criteria:

  • Rosemount OPM series is out of production; OPM series is not supported with parts by OEM (Rosemount); OEM liquid crystal windows are no longer available;  OPM series is not supported technically by OEM (Rosemount) (mainly due to retirement of key individuals).
  • Any COMS replacement ‘should’ marry politely in to your existing COMS reporting system (this is a huge savings).  There will be some necessary minor adjustment to your data system to account for the differences between Rosemount’s daily zero & upscale checks verses the new analyzer’s daily routine; this is customarily performed by the customer’s IT or DCS programmers.  Assistance is provided by RIGAS during installation.

We have four options to consider:

  1. Complete new system
  2. Complete used system (with all proper certifications)
  3. Partial new system (new analyzers coupled to the Rosemount “L” Frame and blowers, and existing wires are utilized)
  4. Partial used system (used analyzers coupled to the Rosemount “L” Frame and blowers, and existing wires are utilized)

Please call us for additional information, consultation, or a quote.

Yes … NLA (no longer available). But, these analyzers are still VERY viable! The electronics are serviceable; the detectors can be replaced. Call us for information!

The OPM2000 series analyzers have been obsoleted for many years.

This is the bi-cell (photocell) in the 755 series paramagnetic oxygen gas analyzers. Its function is to determine the position of the test body (dumb bell) based upon the relative intensity of the light beam bouncing off of a mirror attached to the test body.

RIGAS has a replacement for this NLA (no longer available) part. Call us at 877-616-0600.

Your 755, 755G, 755A, 755R, and 755EX are NOT obsolete. As long as you don’t destroy your detector (dumb-bell assembly) we can maintain this unit for many. many years to come.

Original manufacturer: Beckman, Rosemount, Beckman Industrial

The 616239 is the source lamp (light bulb) for the 755 series paramagnetic oxygen gas analyzers. It was sold in kit form (the lamp and a set of instructions) as 616418.

RIGAS has a replacement for this NLA (no longer available) part. Call us!

Your 755, 755G, 755A, 755R, and 755EX are NOT obsolete. As long as you don’t destroy your detector (dumb-bell assembly) we can maintain this unit for many, many years to come.