Transmitter Yokogawa EJX430 Show IOP and Normal Again

I would call the manufacturer to see if any similar failures have been reported, and what may be the cause....then, if necessary, do a forensic investigation to determine cause of failure....IE: take it apart to see what failed....then come back with all pertinent information to determine cause, if not apparent...

http://www.yokogawa.com/fld/doc/manual/fld-ejx-manual-01en.htm

http://www.yokogawa.com/us/products/field-instruments/pressure-transmitters/gauge-pressure/ejx430a.htm

1) Yokogawa's EJA line is SIL 2/3 certified by TuV Nord, which testifies to its inherent ruggedness. The transmitter has advanced diagnostics. Given the frequency of failure you've encountered, what does the diagnostic data from the failures tell you?

2) Please clarify what "IOP reading" is, with a specific example of what g that is in this case.

3) In a voting situation , there are multiple transmitters each in its location.
3a) How many transmitters are involved at this process point?
3b) Is the one that fails from the same location where the previous failure occurred, or are the failures at different locations?

4). Please provide some details of the processs and environmental conditions:

- Max/min temperatures, ambient and process
- Process medium, what is it? How corrosive is it? Has it been tested for water content? pH?
- vibration at mounting location?
- pressure pulsations in process line? Frequency? Is xmtr output damped to limit pulsation?
- do the transmitters have lightning/surge protection/arrestors installed?
- were any of the xmtrs physically damaged by contact with wrenches, crow bars, or other solid objects at velocities above 0.0 m/s?
- was the area flooded in recent history?
- can water that condenses inside electrical conduit enter the transmitter or are there U trap installed to catch the condensation?
- how close is the nearest VFD installed to the transmitter?

we have verify in error log view it shows P sensor error.in a day 4 to 5 times the alarm is initiated , the voting system 2 of 3 ,we have replaced all of 3 transmitter temperature is between 35 degrees centi. seal pressure measured is .06bar range of transmitter 0 to5 bar , surge protection is installed at the marshalling cabinet . no vfd near by , no flood nor any water condensation, no vibration .

the process is recycle gas compressor hydrogen with some mixture of H2S , trubine driven compressor 13670rpm generally operating.

hope the data is sufficent

Full model number EJX430A-EAS4G-719DD , SURROUNDING I can say transmitter is installed near the compressor side where we have two make up gas compressor reciprocating plus this recycle gas compressor distance between them appoxi. 5mtrs all are in a roof shade and installed 3mtrs above the ground level.

Fluid composition? Temperatures? Pressures? Flowrates? Materials of construction of the pipework?

Please help the forum to supply the help required.

thanks I ahve to look into it

Ions in a gas? There are very few places near the Earth's surface where a plasma is to be found!

This is a common failure mode of the Yokogawa transmitters. We have had the same thing happen and have removed them from all critical functions. We now only use these transmitters in control situations.

We have approached Yokogawa about the problem and they are unable to explain the failure except to offer a new unit.

I personnally would start looking to a different brand.

Based on experience the EJA series are better than EJX series transmitters.