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For accurate measurement, install the transmitter at a location where liquid level and
temperature fluctuations are minimal
.
3.5.7
Sealed Container Level Measurement: Single Flange Level Transmitter
Use a single flange diaphragm system for sealed container level measurement. Increase
the isolation tank and multiple shut-off valves. Periodically open the drain/vent valve to
clear off the residual gas and liquid in the guiding pressure tube for higher accuracy.
4
Electrical Connections
This section covers all electrical connection requirement. Electrical connection of the device
must be carried out by trained, qualified specialists authorized to perform such work by the
installation site.
WARNING
•
Connect all electrical cables when the power is switched off. If the device does not
have switch-off elements, then, overcurrent protection devices, lightning
protection and/or energy isolating devices must be provided by the customer.
•
The device must be grounded to a spot in accordance with regulations to protect
personnel against electric shocks.
NOTE
•
When using the measuring device in hazardous areas, installation must comply
with the corresponding national standards and regulations and the Safety
Instructions or Installation or Control Drawings.
4.1
Grounding of Measuring Device
•
Ensure proper grounding at control cabinet and pressure transmitter.
•
Ground terminals are provided on the either sides (inside and outside) of the terminal
box. Either one of these terminals may be used for grounding the transmitter.
•
Use shielded twisted pair cable to avoid ground loops.
•
Use internal ground terminals for direct grounding.
