IM100CZ08-E9
9
7. TROUBLESHOOTING
Problem Possible
cause
Indication pointer
completely defects
to the left or right.
•
No indicator input circuit connected.
•
No 4-conductor shielded cable connected.
•
The defective connector used (standard or water
resistant connector).
•
Wires disconnected or shorted.
•
No internal sensor wiring connected.
•
The fiberglass coated cable immersed into water or
exposed to high temperature, resulting in
deteriorated insulation resistance.
•
No rated output set to the PCT-300 (different gain).
•
The double gain selector switch turned ON.
•
The strain gauge deteriorated due to exposure to
high temperature.
•
No zero adjuster adjusted.
•
Digital display
overflows or
underflows.
No pressure is
indicated under
pressurized
condition.
•
Irregularly tapped hole for installing the CZ-200P.
(The sensor tip strongly contacting with the tapped
hole.)
•
The diaphragm deteriorated, deformed or
damaged.*
•
Mechanical Lead pipe deformation by external
force.
Pointer or indication
fluctuates during
relay actuation.
•
No measures for relay spark killing taken.
•
No 4-conductor cable shield perfectly wired or
grounded.
•
The PCT-300 located near magnetically operated
relays.
Pressure indication
is fluctuated.
•
Value different from the sensor rated output set
to the rated output setter for the PCT-300.
•
The diaphragm deteriorated, deformed or
damaged.*
•
The sensor exposed to hot or cold wind.
•
Some potential against the earth generated
(Two-point grounding, etc.).
Normal operation
was performed, but
no reading was
received after a
while or the reading
varied and was
unstable.
•
Imperfect connecter contact.
•
The lead pipe deformed by external force.
•
The diaphragm deteriorated, deformed or
damaged.*
•
The fiberglass coated cable immersed into water or
exposed to high temperature, resulting in
deteriorated insulation resistance.
•
The sensor exposed to hot or cold wind.
•
The extruders now in unstable operation or
temperature rise.
Indication fluctuates
from the beginning.
•
The sensor tip forcibly tightened due to the small
tapped hole.
•
The lead pipe cover contacting with the barrel, etc.
Resin leakage.
•
The sealed surface deformed or scratched.
•
Foreign material (carbide, etc.) attached on the
sealed surface.
•
Low sealed surface accuracy
(parallelism, axis, etc.).
•
No screw threaded down to the extreme end.
•
Tightened at less than appropriate torque or not
tightened.
No threads
regularly engaged
(no screw removed).
•
No screw threaded down to the extreme end.
•
Not threaded as conforming to the standard.
•
The screw with burrs used.
•
Tightened at excessive torque.
•
Tightened at temperature different from the initial
tightening temperature.
•
Foreign material attached on the threaded section,
or stained.
Indication of
thermocouple is
lower value.
•
A protecting tube of thermocouple compensating
leads and thermocouple connector are damaged,
deformed, or broken down.
For taking measures, also refer to
3. HANDLING OF THE
PRESSURE SENSOR
on page 2. The converter is described on a
basis of the PCT-300. The operation of the PG500 and REX-PG410
may differ from that of the PCT-300 described here.
For the cause of diaphragm deterioration, deformation or
damage, refer to the
* Main causes
on page 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.
Diaphragm
Flange (Packing/Sealing surface)
[Flat tightening or tapered tightening surface]
Sensor pressure sensing part
8. SPECIFICATIONS
Pressure
measurement
section
•
Specification
Sensing block construction:
4-side adhesion-type strain gauge, Wheatstone bridge
Rated pressure:
Fixed nut type: 10 MPa, 20 MPa, 35MPa, 50 MPa, 70 MPa, 100 MPa,
150
MPa
Loose nut type: 0.5 MPa *, 1 MPa, 2 MPa, 3 MPa, 5 MPa, 10 MPa,
20 MPa, 35MPa, 50 MPa, 70 MPa, 100 MPa
* However, this range can be used when combined with the
CT-300 (the ZK-872 specification), PG500 or REX-PG410
The SUPRON diaphragm specification type is not available to the
range of 5 MPa or less and 150 MPa.
Rated output:
1.0 to 1.8 mV/V
[Calibration temperature: At diaphragm temperature of 150
°
C]
0.5 to 0.9 mV/V (For the “0.5 MPa” range)
[Calibration temperature: At diaphragm temperature of 150
°
C]
The output of each sensor becomes a specific value within the
range of 1.0 to 1.8 mV/V.
Bridge impressed voltage:
10 V DC (When using PCT-300 or CT-300),
7.7 V DC (When using PG500 or REX-PG410)
Accuracy:
SUS630 diaphragm specification type
[At diaphragm temperature of 150
°
C]
:
The range of 70 MPa or less:
±
1.0 % of span
The range of 100 MPa or more:
±
2.0 % of span
SUPRON diaphragm specification type
The range of 70 MPa or less:
±
1.0 % of span
More than 480
°
C of 10 MPa, 20 MPa and 70 MPa range:
±
2.0 % of span
The range of 100 MPa:
±
2.0 % of span
480
°
C or more:
±
4.0 % of span