Burnout Settings in a Transmitter

Can you please explain what you mean by 'burnout setting' as I have not come across this.

Do you perhaps mean transmitter failure mode?

"Burn-out" is common terminology in thermal processing industries.

The term is used in the configuration of instruments or controllers to which thermocouples or RTD's connect, like field transmitters or analog inputs on PLC's, DCS's, single loop controllers, Process Automation Controllers (PAC's), indicators or recorders.

The term is used to define output action of the transmitter or the analog input function block in the event that the input loses its sensor signal, i.e. the sensor circuit goes to an open circuit condition. An open circuit infers that the input sensor, thermocouple or RTD, has "burned out", been disconnected or has had a signal wire cut. The loss of a valid sensor signal is indicated by driving the indicated input signal either full down scale or full up scale.

In heating applications, the loss of a sensor input is generally (not always) upscale burnout, which drives a controller's PID or ON/OFF output to zero because the PV (temperature) is too hot, hence the control output is reduced, presumably to safe levels.

Some digital indicators will 'flash' digits to indicate a fault. The signal disappears upscale or downscale on a recorder. Low or high alarms are tripped, depending on burn-out direction.

Ah! A sensor fault (i.e. <4mA or >20mA).

Well, most programmable electronic systems have a facility with which to raise an alarm should something like this happen.

for low trip - Burnout feature shall be upscale i.e., 20 mA

for high trip - Burnout feature shall be downscale i.e., 4 mA

this is because to ensure fail safe condition burnout feature shall be opposite of trip condition.

Hi, Guest

Basically this burn-out configuration it is depend on the process requirement?

Regards