Interested to Buy Any Domain ? << Click Here >> for more details...
why temperature transmitter is showing ambienttemp.but 21.5ma.
alarm AO showing at the display &how to sloves this problem.
- 2 Answers
- 6154 Views
- I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
When you need troubleshooting assistance you need to supply
certain critical information:
1) Has the device ever worked correctly before for some
time period and then failed?
Or is this a first time commissioning issue?
2) What is the brand name and model number of the device?
3) Because all devices have an input and an output, exactly
what each is (is your sensor one thermocouple, two
thermocouples, or one RTD?)
- You do tell us the output is 21.5mA.
4) What are the error codes or what the error symptoms?
- You mention the display shows ambient temperature
5) What you've done to troubleshoot the problem, like
substitute a known source (simulator) and the result
was . . . . ?
Evaluation:
ambient temperature: A short circuit (a wire) across the
terminal inputs of a thermocouple input will display near-
to-ambient temperature, specifically the temperature of the
terminal block connectors. The value is the cold junction
compensation (CJC) temperature.
Some high end transmitters will show the CJC temperature.
Is the display stuck on the CJC temperature, rather than
its input? Is there a short across the (+) and (-) input
terminals?
21.5mA is a very common fail-safe alarm level, outside the
normal 4-20mA range, but indicating that there is a serious
fault in the transmitter setup or operation. If the fail-
safe is configured for fail high, an open input (among many
other things) could cause the fault.
Smart transmitters generate an error code and save it. If
the transmitter has HART, the error code is in one of the
diagnostics registers, but a HART communicator is needed to
access the error code.
Carl Ellis
Measure First
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
what is basic difference between motion balance and force balance in pneumatic instrument?
what about your moleg in pogrees with company
What is mean by analytical instrumentation?
what is the reason while warning lamp is on while the engine is cranking?
hi! i want to know about mpse exam.
what is a vortex flow meter,mass flow meter and electromagnetic flow meter.particular use of this.means in which condition particular meter is used.
How many interlocks at turbine side?
what is your eligibility criteria for freashers?
What is the cascade control
control panel design guidelines
What is sensitivity in vibration probes..?
How to Calibrate Vortex Flow transmitter in field
I m appointed as an automation trainee engineer in small firm in that I am only the one , my company give me a project on s7-200 as i m beginner I don't know how to program so please send me the helpful site so that I complete my project before deadline....please help me out in this critical situation.
how pressurize drum calibrated ?
what effects a surging can produce in the compressor
