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Failure
Broken primary element
Broken chip
Pin detachment
Pressure over 200% of the span vs factory zero @ RT
Preload loss exceeds -30 % of span vs factory zero @ RT
Primary or front end stage error
Overvoltage
Undervoltage
Program sequence error
Overtemperature on electronics
Error in RAM memory
Error in ROM memory
Error in CPU
Analog output error
Tab� 10�2� - Failures, effect on electrical output and reset * See Fig. 10.1 - Output levels
In the H series melt sensors, no hardware feedback have been implemented.
Alarm and Saturation values burst mode
No special requirements are defined for the burst mode.
Alarm and Saturation values in multidrop mode
If the device is in multidrop mode, the NAMUR levels are no longer achievable. Instead the fail safe condition is
indicated by the field device status and by the additional diagnostics.
Mainteinance and troubleshooting
To maintain the device in the designated category it must be used only by skilled people and strictly following
the present safety instructions and the operating manual regarding the mechanical installation, the electrical
connection, the maximum rated and environmental conditions.
Visual inspection of the process front end membrane and of the pitch of the thread
The activity evaluates abnormal abrasion or wearing due to uncorrect mounting or by aggresive process mate-
rials. The thread pitch inspection must assure the sensor integrity to avoid fluid outcoming from the extrusion
chamber or poor sealing of the sensor mounted in its side.
Periodicity: every 1 year.
Installation hole check
The activity evaluates the hole profile and dimensions in order to avoid failures or sensor bad functioning.
Periodicity: every 2 years.
Sensor calibration check
The activity evaluates the sensor transduction characteristic curve. This is implemented by applying known pres-
sure and checking the output detected values.
Periodicity: every 2 years.
Pressure channel occlusion check
The activity evaluates the presence of eventual occlusions of the pressure channel which will lead to improper
functioning. At any new installation or re-installation use anti-seize compound paste in order to avoid grip of the
thread.
26
Analog
output
HIGH
Send sensor to factory for repair
HIGH
Send sensor to factory for repair
HIGH
Send sensor to factory for repair
HIGH
Switch off and on; if error persists send to factory for repair
HIGH
Switch off and on; if error persists send to factory for repair
HIGH
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
LOW
Switch off and on; if error persists send to factory for repair
80636B_MAN_HMF - HWF_05-2022_ENG
How to reset
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