Cerabar S
28 Endress+Hauser
Oxygen applications Oxygen and other gases can react explosively to oils, grease and plastics, such that, among other things, the
following precautions must be taken:
– All components of the system, such as measuring devices, must be cleaned in accordance with the BAM
(DIN 19247) requirements.
– Dependent on the materials used, a certain maximum temperature and a maximum pressure for oxygen
applications must not be exceeded.
The devices suitable for gaseous oxygen applications are listed in the following table with the specification p
max
.
Silicone-free applications Special cleaning of the transmitter to remove paint-wetting substances, for use in paint shops → ä 81
"Ordering information PMC71", feature 80 "Seal", version "L" and "M".
Ultrapure gas applications Endress+Hauser also offers devices for special applications, such as ultrapure gas, cleaned from oil and grease.
No special restrictions regarding the process conditions apply to these devices.
→ ä 79, "Ordering information PMC71", feature 80 "Seal" or → ä 85, "Ordering information PMP71",
feature 90 "Fill fluid".
Applications with hydrogen With regard to materials in which hydrogen formation takes place, hydrogen atoms can diffuse through the
metallic process isolating diaphragm. This can result in incorrect measurement results.
Endress+Hauser offers process isolating diaphragms with gold-rhodium coating for this application.
→ ä 83 "Ordering information PMP71" and → ä 87 "Ordering information PMP75", feature 60 "Membrane
material" version "6".
Order code for devices
1)
cleaned for oxygen
applications
1) Only devices, not accessories or enclosed accessories.
p
max
for oxygen applications T
max
for oxygen
applications
PMC71 – ********2**,
Devices with sensors, nominal value < 10 bar
(150 psi)
Over pressure limit (OPL) of sensor
2), 3)
2) → ä 79 ff "Ordering information", feature 40 "Sensor range; Sensor over pressure limit (= OPL)
3) PMC71 with PVDF thread or flange p
max
= 15 bar (225 psi)
60 °C (140 °F)
PMC71 – ********2**,
Devices with sensors, nominal value ≥ 10 bar
(150 psi)
30 bar (450 psi) 60 °C (140 °F)
PMP71 – *********N** Dependent on the lowest-rated element,
with regard to pressure, of the selected
components: over pressure limit (OPL) of
the sensor
1)
, process connection (1.5 x PN)
or fill fluid (160 bar (2400 psi))
85 °C (185 °F)
PMP75 – **********N** Dependent on the lowest-rated element,
with regard to pressure, of the selected
components: over pressure limit (OPL) of
the sensor
1)
, process connection (1.5 x PN)
or fill fluid (160 bar (2400 psi))
85 °C (185 °F)
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