5.3. VMID Measurement Point
5.3.1. How the VMID Measurement Point Functions
The VM24 is equipped with an electronic measuring point detector. Metra offers a
type VMID measurement point, which is made of magnetic stainless steel and has
an inbuilt memory with an individual serial number (17).
The serial number stored inside the measurement point is a unique 16-digit hexadec-
imal number, e.g. “
000000FBC52B”
.
Each measurand can be easily and reliably allocated to a specific measuring point.
To read the serial number, contact is made through the sensor's magnetic base.
The maximum permissible operating temperature for the VMID is 80 °C.
5.3.2. Mounting the VMID Measurement Point
A VMID measurement point is mounted onto the machine using two component
epoxy adhesive. For an accurate vibration transmission, Metra recommends the fol-
lowing adhesive:
•
LOCTITE Hysol 3430 without filler for even surfaces
•
LOCTITE Hysol 3450 with filler for uneven surfaces
Before applying the adhesive ensure that all residues of grease have been thor -
oughly removed from both contact surfaces. The two component adhesive can be
applied directly onto the chosen surface. The adhesive takes 5 minutes to harden
and after 15 minutes the first measurement can be taken.
For protection against dust and humidity according to IP67 please put the supplied
protective plastic cap on the VMID measurement points when no measurements are
taken.
13
Figure 17: VMID Measuring point
