SMAR ld301, Инструкция по эксплуатации и техническому обслуживанию

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LD301 – Operation and Maintenance Instruction Manual
5.6
Fig. 5.2 – Sensor Rotation Stopper
Pull the main board out of the housing and disconnect the power supply and the sensor connectors.
REASSEMBLY PROCEDURE
SENSOR
When mounting the sensor ( 27 ), it is recommended to make use of a new set of gaskets (19 & 20)
compatible with the process fluid. The bolts, nuts, flanges and other parts should be inspected for
corrosion or other eventual damage. Damaged parts should be replaced.
O_RINGS AND BACKUP RINGS FOR HIGH PRESSURE
High pressure transmitters A5, M5, M6 and High static pressure H2,
H3, H4, H5 and the sensors with tantalum diaphragm that use Buna-N
or Viton O-ring must use a metallic backup Ring (
28 ) to prevent
extrusion of O-ring. Do not use the backup O-Ring when using Teflon
O=Rings or flanges that have Kynar insets (PVDF).
Avoid bending the backup ring and inspect it for knits, cuts etc. Be
careful when mounting it. The flat side, which shines more than the
beveled side shall be mounted against the O-ring (Figure 5.3).
For these models, when teflon O_ring is used, it must be a special
“SPRING LOADED” O_ring. See the spare parts list for the appropriate
part number.
Gaskets should be lightly lubricated with silicone oil before they are fitted into their recesses. Use
halogen grease for inert fill applications. The flanges should then be positioned in order to press them
in place.
Procedure for tightening the flange screws:
With the flanges holding the O-Rings in place, insert the four bolts ( 18 ) and tight the nuts ( 24 ) finger
tight, making sure the flanges remain parallel all the time.
•
Tighten one nut till the flange seats;
•
Tighten the nut diagonally across with a torque of approximately 3 Kgfm (20 ft. lbs);
•
Tighten the first nut with the same torque;
• Verify the flanges alignment;
•
Check torque on the four bolts.
WARNING:
Do not assemble with power on.