KROHNE CORIMASS G-MFM 4085 EN - Manual (Page 13)

13
Ex Temperature Classes for Insulated/Heated Meters
Process Temperature Temperature Class
65°C T5
100°C T4
130°C T3
Optional 150°C T3-T1
If remote meters are insulated (see figure 13), it is imperative that the insulation does not rise
above the square plate mentioned above and a thermal insulation adapter must be purchased
from Krohne and fitted as shown.
Figure 13
1.3.2 Electrical Trace Heating
The use of electrical heating tape is illustrated in figures 14,15,16 and 17. The use of self-
limiting tape is ideal, but other types of electrical heating may be used. Any thermostat should
be fitted to the adjacent pipework, if this is done it should be firmly fixed with no loose wires or
connections that could vibrate. If only pipework and flanges are insulated, two turns of heating
tape should be tightly applied to the flanges and covered in insulation as shown. All heating
tapes should be tightly fixed with no areas that could vibrate. Between the flanges the heating
tape should be secured to the converter neck, but insulated from it (figure 16) or run back to the
first clamp and then in a loop to the opposite clamp (figure 17). Krohne can supply a list of
electrical heating tape suppliers, if required. If the meter case is insulated then heating tape
may be applied tightly under the insulation. It is recommended that the heating tape be applied
axially and continuously taped down (figure 15).
Figure 14
Figure 15
Figure 16