KROHNE BM 70 M Series, Installation And Operating Instructions Manual

Page: 25 / 110

BM 70 M 25
Weights:
Meter size Standard antenna Length Weight
DN (mm) ANSI (“) Type
∅
A (mm)
∅
A (“)
f (mm) f (“) kg lbs
200 8 4 200 7.87 335 19.19 30 66.14
80 3 1s 76 2.99 420 16.54 18 39.68
100 4 2s 100 3.94 620 24.41 19 41.89
150 6 3s 152 5.98 820 32.28 25 55.12
200 8 4s 200 7.87 820 32.28 32 70.55
* Hastelloy: + 30 mm (1.12”)
7.2 Replacement of the signal converter
Always disconnect from power source before commencing work!
Hazardous-duty systems
Before replacing the signal converter (instrument "head") in the hazardous
location, make absolutely certain that there is no explosion hazard (gas-free
certificate). Allow the prescribed waiting time of 27 minutes to elapse before
opening the housing!
1. Remove safety lock (see Sect. 9.3) with machinist's wrench, size 4 mm, and unscrew cover
from the terminal box with the special wrench. If a sunshade is fitted, remove this first (see
Section 6.1.9).
2. Disconnect all cables from the terminals in the terminal compartment, see Section 7.6.
3. Remove the 4 Allen screws M (Allen key size 5 mm) and lift off the signal converter.
The flange unit (incl. waveguide window) will remain tight, also on pressurized tanks.
Caution
On pressurised tanks, do not on any account remove the 4 screws H connecting
the waveguide window to the BM 70 M flange!
DANGER TO LIFE!
4. Install the new BM 70 M signal converter.
5. Check power voltage and fuse(s) (refer to instrument nameplate) and change or replace if
necessary, see Sect. 9.2 and 9.3.
6. Reconnect all cables in the terminal compartment as described in Sect. 7.6.
7. Check against the attached report on settings whether the factory-set parameters are correct
for your application. If not, reset the parameters as described in Sect. 8.
8. Subsequently, record the empty-tank spectrum, see Sect. 8.6.12.
Important
Ensure that the screw thread of the covers on the terminal and electronic
compartments is well greased at all times.