Endress+Hauser RMS621 - Process Error Messages

RMS621 Trouble-shooting
Endress+Hauser 55
9.3 Process error messages
Display Cause Remedy
Config error:
• Pressure
• Analog temperature
• Temperature RTD sensor
•Analog flow!
• PFM pulse flow!
• Applications!
• Limit values!
•Analog outputs!
• Pulse outputs!
• Pressure mean value
• Temperature mean value
• Flow mean value
• Flow differential pressure (DP)
• Flow splitting range
• Flow DP: no computation
• Incorrect or incomplete programming or loss of
calibration data
• Contradictory terminal assignment
• Error in computation
• No computation takes place due to the incorrect
configuration
• Check whether all necessary items have been
defined with plausible values.
(→ Section 6.3.3 Main menu - Setup)
• Check whether there is contradictory input
assignment (e.g. flow 1 assigned to two
different temperatures).
(→ Section 6.3.3 Main menu - Setup)
Wet steam alarm The steam status calculated from the temperature
and pressure is near
(2 °C / 3.6 °F) the saturated steam curve
• Check the application, devices and connected
sensors.
• Change the limit function if you do not need the
“WET STEAM ALARM”.
(→ Set point settings, Section 6.3.3)
Temp. outside steam range! Measured temperature outside the permitted
steam value range. (0 to 800 °C (32 to 1472 °F))
Check settings and connected sensors.
(→ Input settings, Section 6.3.3)
Pressure outside steam range! Measured pressure outside the permitted steam
value range. (0 to 1000 bar (0 to 14504 psi))
Check settings and connected sensors.
(→ Input settings, Section 6.3.3)
Temperature exceeds sat. steam range! Measured or calculated temperature outside the
saturated steam range (T>350 °C (662 °F))
• Check settings and connected sensors.
• Set "superheated“ steam and carry out
measurement task with three input variables
(Q, P, T).
(→ Application settings, Section 6.3.3)
Steam: condensate temperature Phase transition!
Measured or calculated temperature corresponds
to condensate temperature of the saturated steam.
• Check application, devices and connected
sensors.
• Measures for process control: increase
temperature, reduce pressure.
• Possibly imprecise temperature or pressure
measurement; purely computed transition from
steam to water which does not really occur.
Compensate inaccuracies by setting an
offset for temperature (approx. 1-3 °C (1.8-
5.4 °F)).
Water: boiling temperature Measured temperature corresponds to the boiling
temperature of the water (water evaporates!)
• Check application, devices and connected
sensors.
• Measures for process control: reduce
temperature, increase pressure.
Signal range error "channel name" "signal name" Current output signal below 3.6 mA or above
21 mA.
• Check whether the current output is scaled
correctly.
• Change the start and/or end value of the
scaling