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All Gefran sensors are built in conformity to UNI EN ISO 9001: 2000
In case of malfunction, you can run a series of simple checks to identify the type of fault. If the problem is caused by a sensor
malfunction, the sensor MUST be returned to Gefran.
Only Gefran personnel are permitted to open the sensor.
Any repair attempted without Gefran's authorization will cause the warrantee expiry.
ELECTROMECHANICAL PROBLEMS
MALFUNCTION
NO SIGNAL
NO SIGNAL VARIATION
EXCESSIVE SIGNAL IMBALANCE
SIGNAL VARIATION AT
TIGHTENING
NO TEMPERATURE READ
FUNCTIONAL PROBLEMS
FAILURE
The sensor does not feel pressure and no
alarm signal is activated
The sensor is in alarm mode type
"HIGH"
The sensor is in alarm mode type
"LOW"
It's not possible
to carry out the operation of
CALIBRATION
It's not possible
to carry out the operation of
AUTOZERO
80618_MAN_IO-LINK IMPACT_12-2019_ENG
11. RESOLUTION PROBLEMS
POSSIBLE CAUSE
NO POWER SUPPLY
CONNECTION FAILED
BROKEN DIAPHRAGM
PLUG FORMED
OVERPRESSURE
ELECTRONICS MALFUNCTION CALIBRATION ON
INCORRECT INSTALLATION POINT
BROKEN THERMOCOUPLE
BROKEN TC WIRE
POSSIBLE CAUSES
Pressure channel occlusion
Output stage failure
Bridge broken
Detachment of pins
Failure on primary element
Pressure value above threshold
(2x FS)
Power supply cable /connector
broken
Sensor not connected
Sensor not powered
Bridge broken
Overvoltage
Undervoltage
Floating power supply
Program sequence error
Overtemperature on electronics
RAM, Flash, CPU error
• Input pressure out of range of
CAL activation
• Power supply cable /connector
broken
• Broken electronics
• Input pressure out of range of
AUTOZERO activation
• Broken electronics
POSSIBLE SOLUTION
CHECK POWER SUPPLY /
CONNECTIONS
CHECK HOUSING AND DIAPHRAGM
CHECK CALIBRATION
CHECK INSTALLATION HOLE
SEND IT TO THE FACTORY FOR REPAIR
MEANS OF RESEARCH
1. Power down and remove the sensor
2. Verify eventual occlusion of the channel under pressure. Clean any
residues and material caps
3. Reduce the process pressure below the F.S. value
4. Power the probe off-line and press gently with the finger on the
membrane; if the probe does not change output, send it to the Factory
for repair
1. Power down and remove the sensor
2. Power the probe again, if the problem persists, you should send
back the probe to the Factory for repair.
1. Power down and remove the sensor
2. Check that the power supply is connected.
If necessary, restore the power supply.
3. Check for continuity between the pins of the connector and the
power supply.
If necessary, replace the cable and the
connector.
4. Check if the power values are within the specifications indicated in
this manual. If necessary, replace the power supply.
5. Check for overheating of electronics
housing.
Remove the causes of overheating, wait
until it cools down and power the sensor
6. If the problem persists, you should send back the probe to the
Factory for repair.
1 - Stop the machine and make sure the pressure is zero
2 - Check the cable and connector and replace if necessary
3 - Do the following in sequence:
• RESET factory settings
• AUTOZERO
• CALIBRATION
4 - If the problem persists, you should send back the probe to the
Factory for repair.
1 - Stop the machine and make sure the pressure is zero
3 - Run RESET factory settings; if the difference in absolute value
between the read and theoretical zero signal is greater than FS limits,
see tab7.3, remove the sensor, check and clean its seat,
reinsert the sensor and rerun AUTOZERO.
4 - If the difference in absolute value between the read and theoretical
zero signal is less than FS limits (see tab 7.3), check the cable and
connector and replace if necessary
5 - If the problem persists, you should send back the probe to the
Factory for repair.
37
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