Technical Manual MIVI 9612
Réf. 254-30/0
11
2.3. Practical advices
Torque at the mounting screws: 9 N.m
±
1 at the M6
×
100 screws, or 22 N.m
±
1 at the M8 screws
(for the high pressure design).
Tightness is assured by a O-ring (2 for sanitary model). Connections of ground of the sensor and
electronics must be equipotential.
Warning :
Each sensor is equipped with a guard tube in order to protect the vibrating rod. This protector must
be left on the sensor at the time of the assembly on the mounting flange. The fluid renewal is done
through the slits of the protector. He has not to be removed unless when the sensor is used in particular
conditions : on pot mounting, sanitary use, very viscous and fibrous fluids.
WARNING !
In this case, the mounting / removing of the sensor must be made with precaution, in order to
avoid to bend the vibrating rod.
A ring, with the same dimensions of the protector’s base must be placed on the head of the
sensor in order to maintain the O-ring.
IMPORTANT :
•
As soon as the sensor is removed, screw immediately its guard tube.
•
IP 67 rightness is only obtained when firmly screwing either the cable connectors, their replacing
caps, and the cable glands.
•
The minimal bending radius at the flexible pipe (electric outlet) is of 100 mm. Less radius can
generate leakage, then failure.
2.4. Checking
In case of subnormal operation, check the following points:
•
Electrical connections (connectors, cables, power supply…)
•
Remove the sensor from the process and clean it
•
Check that the vibrating rod is not bent.
When powered, check with the finger that the vibration is existing at the rod end. At this
moment, the viscosity information has to increase.
2.5. Sensor wiring
Repère câble
Correspondance
Couleur
A
Receiving coil
Blue
B
Brown
C
Driving coil
Transparent
D
Black
E
PT100
Red
F
Yellow
J
NTC
Green
K
White
/
Shielding
