Samson EB 2111 - Page 50

8-2 EB2111/2121/2123 EN
Malfunctions
Malfunction Possible reasons Recommended action
Temperature regulators for heating applications·Type1 and Type4
Temperature at the
sensor does not reach
the set point
Regulatorinstalledagainsttheow
Î Install the regulator so that the direction of
owmatchesthedirectionindicatedbythe
arrow on the body.
Safety device (e.g. safety temperature lim-
iter) has been triggered
Î Checkplant.Ifnecessary,unlocksafety
device.
Regulator or K
VS
/C
V
coefcienttoosmall
Î Checkthesizing.
Î ChangeK
VS
/C
V
coefcient,ifnecessaryor
installadifferentsizedregulator.
Î ContactSAMSON'sAfter-salesService.
Insufcientheatingenergyavailable Î Draw up an energy balance.
Foreign particles blocking the plug
Î Remove foreign particles.
Î Replace damaged parts.
Î ContactSAMSON'sAfter-salesService.
Sensor installed incorrectly.
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.
Sensor installed in the wrong location. Î Changethemountingposition.
Strainer blocked Î Cleanthestrainer.
Slow control response
Time constant is too large for the control
loop
Î Fill the thermowell with thermal paste or
remove the thermowell.
Î ContactSAMSON'sAfter-salesService.
Sensor installed incorrectly.
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.
Loud noises Highowvelocity,cavitation
Î Checkthesizing.
Î Install larger regulator, if necessary.
Leak between control
thermostat and valve
Couplingnuttightenedincorrectly
Î Checkthespeciedtighteningtorque(see
'Tightening torques' in Annex).