Teledyne 4020

Description

TAI Model 4020 uses a field proven FID detector to measure THC in various streams. This instrument is ideal for monitoring hydrocarbon contamination in high purity bulk gases. When coupled with Teledyne’s unique separation column, the 4020 is also diverse enough to be applied in hazardous locations for the detection of volatile hydrocarbons in cooling water for process leak detection and environmental compliance.

Applications

• Monitoring the purity of oxygen, argon, nitrogen and other blanketing gases in the manufacture of microcircuits • Monitoring hydrocarbon contamination in air liquefaction and other gas production processes • Gas purity certification • Detecting trace hydrocarbons in ambient air • Detecting atmospheric pollutants • Monitoring for fuel leakage or toxic solvents • Monitoring hydrocarbons in CO2 feed streams in the food/beverage industry

 

General

Dimensions                                   17.65″ wide x 8.81″ high x 13.25″ deep

 

Panel Cutout                                17.5″ wide x 8.95″ high

 

 

History

– under construction –

Documentation

– under construction –

Drawings

– under construction –

Parts

– under construction –

Troubleshooting

4020 Troubleshooting

I have good news … the Teledyne 4020 can be dual fuel without mechanical or pneumatic modification.  This is in stark contrast to the Rosemount 400A that does require a different fuel restrictor and different capillary.

That being said, you’ll have to do some important tasks when changing fuels.

Let’s do this (going from PURE fuel to MIXED fuel):

  • Set the fuel to 10 psig and attempt to light the flame. If that doesn’t seem to work, go up to 13 psig.
  • Once lit, do a quick test with zero gas and span gas just to see that it responds (we don’t care what it reads, just that it does read)
  • Extinguish the flame (as we really don’t know how hot we’ve made it inside the burner; see the “The next steps” below)

Let’s do this (going from MIXED fuel to PURE fuel):

  • Set the fuel to 2 psig and attempt to light the flame. If that doesn’t seem to work, go up to 3 psig.
  • Once lit, do a quick test with zero gas and span gas just to see that it responds (we don’t care what it reads, just that it does read)
  • Extinguish the flame (as we really don’t know how hot we’ve made it inside the burner; see the “next steps”)

The next steps:

  • Find a set of needle tip probes for your voltmeter.  We have to see where the temperature actually plateaus at once we get lit.
  • Find a set of ‘mini-grabber’ clips to test the Preamp Board output signal
  • Call RIGAS for the rest of the procedure.

Teledyne 4020 THC analyzer is a great hydrocarbon analyzer but has one flaw!  This flaw only shows up as an annoyance when you are monitoring a process AND controlling off of the 4020’s output signal.  The flaw is in the software; the hardware is fine.

Here is the scenario: your process is looking good with about 11ppm of THCs.  Then a small upset occurs in your process and the hydrocarbon readings start to climb (they can climb slow or fast, it doesn’t matter).  At some point, the analyzer has to change its gain on the Preamplifier Board (a.k.a., preamp board) to avoid signal saturation; this is “normal” when the process readings change.  Depending on the configuration of the preamp board (there are about eight different configurations) will determine when it actually changes gain. For the sake of this example, let’s say that it changes gain at 20 ppm … at that magic moment of gain change, the analyzer blips, hiccups, or spikes, whatever you want to call it.  The spike can be significant maybe up to 60, 80, or even 100ppm.  When your DAS or PLC sees that (errant) spike, your process may end up getting tripped on (falsely) high hydrocarbons.

Solution: ensure that your PLC doesn’t enact a trip on a spike but is coded to perform signal averaging of the process signal (value).

The “real” solution: the OEM needs to improve their code such that the output is held for a few seconds during the gain change.  The analyzer knows when it’s going to do the change so it can certainly “hold last known value” until the spike dissipates (only a few seconds is necessary).

This is a short list of activities that we perform on your analyzer:

1. First, we do AS-FOUND testing:

is anything broken inside?

does it power up?

does the case heater work?

are the displays working?

does it light?

does it respond to calibration gases?

does it seem to be contaminated?

do the regulators and gauges work correctly?

do the analog outputs work?

2. We test all of the restrictors and test them for performance against the OEM’s specifications.

3. We replace out-of-specification restrictors

4. We do a clean up of the interior

5. We repair anything that is broken (with your authorization)

6. We reassemble, light, test, calibrate, and run for 24 hours on a data acquisition trend

7. We attach calibration stickers and optimized pressure settings stickers

8. We write up a service report

9. Then it’s boxed up and shipped according to your specifications

If you get the analyzer back and find that something is not quite right, PLEASE CALL US. It could be as simple as a loose coax cable or ribbon cable … certainly something out of our control after it leaves our facility.

We sincerely appreciate your business and trust in our company.

 

Keywords: Teledyne 4000 Series THC analyzer 4020 troubleshooting total hydrocarbons