Yokogawa Pneumatic Retractables RF20H - Manual (Page 17)

IM 12B06K05-E-E
17
7. Trouble shooting
Refer to the instructions and warnings in the specified chapters.
7.1 Holder does not move from the "service" position to the "measuring" position
possible reason measure
no compressed air check pneumatic tubes (chap. 6.4, 4.6)
pressure too low pressure must be between 4 and 6 bar (chap. 4.6)
no sensor Installing the sensor (chap. 4.7)
loose sensor tighten sensor (chap. 4.7)
7.2 Holder does not move from the "measuring" position to the "service" position
possible reason measure
no compressed air check pneumatic tubes (chap. 6.4, 4.6)
pressure too low Pressure must be between 4 and 6 bar (chap. 4.6)
Insertion rod or protection cage is blocked. • Preparing the system (chap. 4.1)
• Holder remains in “measuring” position
• Removing the cleaning chamber with process
connection (chap. 6.5)
• Removing the insertion rod (chap. 6.7)
7.3 Incorrect position reply
possible reason measure
pneumatic tubes are connected incorrectly check pneumatic tubes (chap. 6.4, 4.6)
7.4 No position reply
possible reason measure
no compressed air check pneumatic tubes (chap. 6.4, 4.6)
pressure too low pressure must be between 4 and 6 bar (chap. 4.6)
drive unit defect Replacing the drive unit (chap. 6.10)
7.5 Frequent contamination of sensor
possible reason measure
cleaning pipes incorrectly connected check cleaning pipes (chap. 4.5)
cleaning liquid pressure too low raise cleaning pressure.
cleaning chamber is blocked pressure must be between 1 and 4 bar (chap. 4.6)
cleaning liquid not adequate choose adequate cleaning liquid
cleaning period too short extend cleaning period
cleaning interval too long reduce cleaning interval