12
80636B_MAN_HMF - HWF_05-2022_ENG
CORRECT SEAL
contact surface
TRANSDUCER INSTALLATION
Installation procedure
1) Make sure the drilling procedure has been realized correctly. If the sensor is installed in a previously used
hole, make sure the hole is completely clean and free of any plastic residual.
2) Remove the protective cap from the sensor tip.
3) Lubrificate the thread with non-grip grease such as Neverseez (Bostik), or C5A (Felpro), or equivalent.
4) Insert firmly the sensor into the hole, first by hand and then with a wrench, 1/4 turn at a time.
Recommended torque: 50 Nm, the maximum is 56.5 Nm.
Removal (Fig. 6.1.)
To remove the transducer from its seat and carry on the working process, dummy plugs with identical mecha-
nical dimensions are available.
The dummy plugs differ by type of threading; max pressure range is 2000 bar for all rods.
The dummy plugs are available in the following versions: SC12 1/2-20UNF seat - SC18 M18x1,5 seat.
Brackets (Fig. 6.2.)
Models with flexible sheaths require the housing precise fixing. Suitable fastening brackets (SF18) are recom-
mended.
Remember that the fastening point must be vibration-free (vibrations affect the measurement) and that tem-
peratures must not exceed the maximum temperature range for the strain gauge housing (as stated on the
sensor technical sheet).
Extruder starting
Bring the system to working temperature with the transducer installed and without any pressure applied.
Wait until all the material is at the same temperature to prevent the transducer damage by semi-solid material.
Seat cleaning & Cleaning tool
As mentioned in the notes, the seat must be cleaned before the transducer installation.
The cleaning tool is a hard metal cutting tool specially designed to remove working materials residuals.
Recommended procedure (Fig. 6.3.)
The following procedure must be implemented with the material in a fluid condition.
1) Insert the tool in the seat and screw down the cutting rod (normally a 1/4 turn at a time).
2) Turn the pilot cutter clockwise until there is no resistance to cutting.
3) Repeat the procedure until the seat is completely clean.
For constructive reasons, the maximum torque applicable to the cutter is 15 Nm (1.5 Kgm).
If the hole occlusion requires higher torque for removal, use the drilling kit and follow the recommended
procedure.
The cleaning tool is available in the following versions: CT12 1/2-20UNF seat - CT18 M18x1,5 seat.
Fig� 6�3�
Fig� 6�2�
Fig� 6�1�
