Deltapilot M FMB50/51/52/53
26 Endress+Hauser
Oxygen applications Oxygen and other gases can react explosively to oils, grease and plastics. As a result, the following are some of
the precautions that must be taken:
– All components of the system, such as measuring devices, must be cleaned in accordance with the BAM
(DIN 19247) requirements.
– Depending on the materials used, a certain maximum temperature and maximum pressure must not be
exceeded for oxygen applications. The maximum temperature T
max
for oxygen applications is 60°C (140°F).
The devices suitable for gaseous oxygen applications are listed in the following table with the specification p
max
.
PWIS cleaning Special cleaning of the transmitter to remove paint-wetting substances, for use in paint shops → ä 53 ff
feature 570 "Service", version "HC".
The stability of the materials used must be checked before using them in the medium.
The protective cap of the process isolating diaphragm must be removed if necessary (FMB51/FMB52/FMB53).
Applications with hydrogen With regard to materials in which hydrogen formation takes place (e.g. digested sludge), hydrogen atoms can
diffuse through the metal process isolating diaphragm. This can result in incorrect measurement results.
Endress+Hauser offers process isolating diaphragms with a gold/rhodium coating for such instances.
→ Order via feature 170 "Material of the process isolating diaphragm", version "L".
Note!
To reduce the formation of hydrogen, you should not use galvanized assemblies.
Special measuring cells for
acids, alkalis or sea water
(not FMB50)
For acids, alkalis or sea water, Endress+Hauser offers process isolating diaphragms with a gold/platinum
coating.
Note!
With temperature exposure (up to 85 °C (185 °F)) there is an additional zero point deviation of 1,1 mbar
(0,0165 psi).
→ Order via feature 170 "Material of the process isolating diaphragm", version "N".
Order code for devices
1)
cleaned
for oxygen applications
1) Only device, not accessory or enclosed accessory
p
max
for oxygen applications
FMB50
2)
2) Feature 570 "Service" version "HB"
• Depends on the lowest-rated element, with regard to pressure, of the selected
components: over pressure limit (OPL) of the sensor or process connection (1.5
x PN)
3)
• Depends on filling oil
4)
3) → ä 10, "Measuring range" section and → ä 30 ff, "Mechanical construction" section
4) Oxygen applications possible with FKM seal and inert oil.
FMB51
2)
• Depends on the lowest-rated element, with regard to pressure, of the selected
components: over pressure limit (OPL) of the sensor or process connection (1.5
x PN)
3)
• Depends on filling oil
4)
• Depends on seal material
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