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266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
... 6 Installation
... Mounting recommendations
Fill level measurement on the steam boiler
(drum water level)
H High pressure side
L Low pressure side
1 Gas
Figure 22: Level measurement on the steam boiler
•
Mount the transmitter at the same height or below the
lowest level to be measured.
•
Connect the high pressure side '+' of the transmitter to the
bottom of the tank.
•
The low pressure side '–' of the transmitter up at the tank.
Above the maximum level, connect using a condensate
vessel.
•
Use the condensate vessel to ensure that the impulse line of
the low pressure side is always filled with liquid (condensate)
at a constant height.
2 Liquid
3 Condensate vessel
Temperature measurement
•
Mount the temperature sensor in the downstream pipe of
the primary element.
•
Consider the downstream straight pipe requirements.
•
If there is a significant difference between the temperature
of the measuring medium and the ambient temperature, the
measuring error caused by heat conduction must be
minimized by insulating the installation location accordingly.
•
Use class 'A' sensors to maximize accuracy.
•
The lengths of the protective tubes should be 15 to 20 times
the diameter of the protective tube for gas measurements
and 3 to 5 times the diameter of the protective tube for
liquid measurements.