IM100CZ04-E4
9
* Main causes:
These causes may arise independently or in mutual relations.
Generative cause in operation
Overpressure
Load pressure exceeding its limit applied.
Irregular thread
engagement
The metal pressure sensing surface mechanically
scratched or chipped off.
Metal fatigue
The metal sensing surface fatigued by the application
of changing or repeating pressure.
Corrosion
The pressure sensing surface corroded due to its
contact with corroding material.
Abrasion
The pressure sensing surface worn away due to the
mixture of fillers, etc.
Shrinkage
The pressure sensing surface deformed due to the
shrinkage of resin adhered to its surface as a result of
extruder cooling down.
Separation
The pressure sensing surface deformed or damaged by
resin adhered to its surface due to the removal of the
sensor while the resin is not yet melted or its melted
condition is imperfect.
Protrusion
The pressure sensing surface deformed or damaged
due to the protrusion of the push rod from the lead pipe
as a result of an external force applied by the screen
changer, etc.
Contact
The pressure sensing surface deformed due to the
forced contact of the sensor outer side with the hole
inner surface as a result of the finish of the hole inner
surface.
Generative cause in mounting and removing
Impact
The pressure sensing surface deformed due to its strong
strike with solid material.
Dropping
The pressure sensing surface or its circumference
scratched or deformed due to sensor dropping.
Handling
After the resin attached to the sensor tip is heated by a gas
burner, etc. for its removal at the time of inspection, the
pressure sensing surface scratched with a metal brush, etc.
Excessive
tightening
The diaphragm deformed or damaged as the push rod
pushes the diaphragm from the inside as a result of the
deformation of the sensor flange by excessive tightening
torque.
9. EXPLANATION OF EACH
TERMS
Term Explanation
Rated pressure
The maximum pressure which satisfies the
specification. There are stipulated pressure ranges.
Rated output
Value obtained by subtracting the output at no-load
from that at the rated pressure load. Electrically, it is
output voltage per Volt in DC (mV/V) obtained
through the bridge circuit when rated pressure is
applied. At an application voltage of 10 V from the
converter, a voltage of mV
10 is output.
Accuracy
The maximum error including linearity and
hysteresis.
Linearity
The maximum error from a reference line (straight
line without error) when pressure-loaded in the
pressure rise direction continuously from no-load to
the rated pressure.
Hysteresis
The maximum difference between pressures at the
same point in the rise and fall directions when the
same pressure is loaded.
Repeatability
The difference between measured values obtained
each time when pressure-loaded three times
repeatedly from no-load to the rated pressure within
a short period of time*.
Temperature effect
on zero point
Zero-point output variation when the diaphragm
temperature changes by 10
C.
Temperature effect
on output
(sensitivity)
Output sensitivity (span) variation when the
diaphragm temperature changes by 10
C.
Allowable
overpressure
The high limit of overpressure within a short period
of time* at which the accuracy can be guaranteed
even after the pressure returns to the rated pressure
when overpressure-loaded.
Limit overpressure
The high limit of overpressure within a short period
of time* at which no diaphragm is damaged when
overpressure-loaded. However, no accuracy is
guaranteed after the pressure returns to the rated
pressure.
*
Short period of time: From several seconds to several minutes.
