LD301 – Operation and Maintenance Instruction Manual
5.4
DISASSEMBLY PROCEDURE
WARNING:
Do not disassemble with power on.
Figure 5.1 shows transmitter's exploded view and will help you to visualize the following:
SENSOR
In order to have access to the sensor (
27
) for cleaning purposes, the transmitter should be removed
from its process connections. The transmitter should be isolated from the process by means of
manifolds or valves; then, the drain (
23
) must be opened to vent any remaining pressure.
After this, the transmitter may be removed from the standpipe. The flange bolts (
18
) may now be
loosened crosswise, one at a time. After removing bolts and flanges (
17
), the isolating diaphragms will
be easily accessible for cleaning.
Cleaning should be done carefully in order to avoid damaging of the delicate isolating diaphragms. Use
of a soft cloth and a nonacid solution is recommended.
The oscillating circuit is a part of the sensor and the replacement of one implies replacing the other.
To remove the sensor from the electronic housing, the electrical connections (in the field terminal side)
and the main board connector must be disconnected.
Loosen the hex screw (8) and carefully unscrew the electronic housing from the sensor, observing that
the flat cable is not excessively twisted.
IMPORTANT:
The transmitters have a stopper that can be released to allow the sensor
to rotate more than one turn. See Figure 5.2.
CAUTION:
Do not rotate the electronic housing more than 180º without
disconnecting the electronic circuit from the sensor and from the power
supply.
ELECTRONIC CIRCUIT
To remove the circuit board (
6
), loosen the two screws (
5
) that anchor the board and hold the (
7
)
spacers in the other side to avoid losing them.
WARNING:
The board has CMOS components, which may be damaged by
electrostatic discharges. Observe correct procedures for handling CMOS
components. It is also recommended to store the circuit boards in
electrostatic-proof cases.
Summary of Contents for ld301
Page 14: ...LD301 Operation and Maintenance Instruction Manual 1 8...
Page 18: ...LD301 manual de Instru es Opera o e manuten o 2 4 Fig 2 3 LD301 Software Block Diagram...
Page 50: ...LD301 Operation and Maintenance Instruction Manual 4 16...
Page 55: ...Maintenance Procedure 5 5 Fig 5 1 Exploded View...
Page 62: ...LD301 Operation and Maintenance Instruction Manual 5 12...
Page 70: ...APPENDIX A...
