Malfunctions; Troubleshooting - Samson 2479 Mounting And Operating Instructions

8 Malfunctions

8.1 Troubleshooting

Malfunction
Temperature at the
sensor or the flow rate
exceeds the set point.
EB 3132-3 EN
Possible reasons
Insufficient pressure pulses on the oper-
ating diaphragm
Foreign particles blocking the plug
Seat and plug are worn or leak.
Valve too large for control task (flow
rate) or too small (differential pressure)
Defective operating diaphragm
Seat and plug are worn or leak.
A safety device (e.g. STL or STM) has
been triggered.
Sensor installed in the wrong location.
Sensor installed incorrectly.
Recommended action
Î Clean the control line and screw fittings.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Î Replace the damaged seat and plug.
Î Contact SAMSON's After-sales Service.
Î Check the sizing.
Î Change K /C coefficient, if necessary or in-
VS V
stall a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Replace damaged diaphragm.
Î Clean the seat and plug.
Î Replace the damaged seat and plug.
Î Contact SAMSON's After-sales Service.
Î Check plant. Unlock safety device (where nec-
essary).
Î Change the mounting position.
Î Immerse the temperature sensor with its entire
immersion depth in the process medium.
Î Avoid an installation site where idle times or
heat buildup can occur.
Malfunctions
8-1