Cerabar M, Deltabar M, Deltapilot M Installation
Endress+Hauser 13
4.4 General installation instructions
• Devices with a G 1 1/2 thread:
When screwing the device into the tank, the flat seal has to be positioned on the sealing
surface
of the process connection. To avoid additional strain on the process isolating diaphragm,
the thread should never be sealed with hemp or similar materials.
• Devices with NPT threads:
– Wrap Teflon tape around the thread to seal it.
– Tighten the device at the hexagonal bolt only. Do not turn at the housing.
– Do not overtighten the thread when screwing. Max. torque: 20 to 30 Nm (14.75 to
22.13 lbf ft)
4.4.1 Mounting sensor modules with PVDF thread
Risk of damage to process connection!
Risk of injury!
‣ Sensor modules with PVDF process connections with threaded connection must be
installed with the mounting bracket provided!
Material fatigue from pressure and temperature!
Risk of injury if parts burst! The thread can become loose if exposed to high pressure and
temperatures.
‣ The integrity of the thread must be checked regularly and the thread may need to be re-
tightened with the maximum tightening torque of 7 Nm (5.16 lbf ft). Teflon tape is
recommended for sealing the ½" NPT thread.
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