KROHNE BM 70 A_P EN - Manual (Page 32)

Installation and operating instructions BM 70 A/P Page: 32 11/00
7.6 Materials of construction
Check the materials of the antenna, extension, flange, gaskets, and PTFE (contained in all versions)
for compatibility with the product!
7.6.1 Signal converter
Housing: Aluminium with electrostatic powder coating to DIN 55990-3.
Sight window: Glass
7.6.2 Flange system
(Antenna, extensions and flange or flange plating)
Available materials for BM 70 A/P flange systems (in contact with the product):
DIN No. AISI equivalent
Versions mit horn antenna or Wave-Guide:
Stainless steel 1.4571 316 Ti
Stainless steel 1.4435 316 L
Hastelloy C4 2.4610 -
Hastelloy B2 2.4617 -
Titanium 3.7035 -
Tantalum - -
Monell 400 2.4360 -
Inconell 600 2.4816 -
(Information on other materials supplied on request)
Wave-Stick:
In the versions with PTFE flange plate, only PTFE is in contact with the product (no metal in contact
with the tank contents)
Flange made of stainless CrNi steel 1.4571 / 316 Ti
7.6.3 Seals and gaskets
Responsibility as to suitability rests solely with the user.
Available materials for internal device seals and gaskets in the flange system in contact with the
product:
Material Temperature resistance
FFKM (Kalrez 4079 or Parofluor V8545-75) 250°C/482°F (safety limit 280°C / 536°F)
DuPont Kalrez 2035 210°C/410°F
Viton (FPM) 200°C/392°F
FEP-coated 200°C/392°F
7.7 Process connection
The process connection is by way of standard flanges sized DN 50-200 or equivalent ANSI sizes
(dependent on the version). Various hygienic connections are additionally available for the Wave-
Stick (DIN 11851, Tri-Clamp, SMS).
Refer to Section 7.2 for further information on the various versions.