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Manual 35076 LESV II
Woodward 55
The LESV–Flow Sensor requires no special tools for operation or maintenance of the LESV–Flow
Sensor.
Installation and Site Acceptance Testing
Installation and use of the LESV–Flow Sensor must conform to the guidelines and restrictions included in
this manual. No other information is needed for installation, programming, and maintenance.
Functional Testing after Initial Installation
A functional test of the LESV–Flow Sensor is required prior to use in a safety system. This should be
done as part of the overall safety system installation check and should include all I/O interfaces to and
from the LESV–Flow Sensor position sensor element. For guidance on the functional test, see the Proof
Test procedure below.
Functional Testing after Changes
A functional test of the LESV–Flow Sensor is required after making any changes that affect the safety
system. Although there are functions in the LESV–Flow Sensor that are not directly safety related, it is
recommended that a functional test be performed after any change.
Proof Test (Functional Test)
The LESV–Flow Sensor must be periodically proof tested to ensure there are no dangerous faults present
that are not detected by on-line diagnostics. This proof test should be performed at least once per year.
Functional Verification (Proof) Test Procedure (Module Level)
The suggested transmitter proof test consists of a three-point calibration check (see table below). The
suggested proof test will detect 90% of possible DU failures in the LESV–Flow Sensor. This proof test
detects failure of the LESV–Flow Sensor as well as the transmitter.
Table 7-3. Suggested Proof Test
Step Action
1
Bypass the safety function and take appropriate action to avoid a false
trip.
2 Set the valve to its Zero position.
3
Stroke the valve through its full range of motion to its Full-scale
position to confirm full range of motion.
4 Return the valve to its Zero position.
5
Perform a three-point calibration of the transmitter over the full
intended working range.
6 Remove the bypass and otherwise restore normal operation.
This is referenced in the product FMEDA: WOO 17/07-039 R002.
Released