Siemens SITRANS LUT400 Operating Instructions Manual page 248

Symptom
Incorrect reading (mA
output and/or dis-
played value)
Relay not activating
Relay not activating
correctly
Page 240 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Cause
mA function not assigned to
correct measurement
When device configured for
flow: exponent or breakpoint
not correctly selected
Incorrect vessel or PMD dimen-
sions
Relay not programmed
Relay incorrectly assigned
Incorrect relay function
selected
Incorrect relay setpoints
Relay incorrectly assigned
Incorrect relay function
selected
Incorrect relay setpoints
Action
Check mA assignment. See Cur-
rent Output Function (2.5.1.) on
page 144.
Check configuration: if
sor Mode
set to FLOW, verify cor-
rect exponent [Flow Exponent
(2.15.3.2.) on page 192] and break-
points [Universal Head vs. Flow
(2.15.5.) on page 198].
For volume application: Verify ves-
sel dimensions. See Vessel Shape
(2.6.1.) on page 147.
For flow application: Verify PMD
dimensions. See PMD Dimen-
sions (2.15.4.) on page 195
Program relay.
Verify with simulation. See Simu-
lation (3.4.) on page 215.
Verify with simulation. See Simu-
lation (3.4.) on page 215.
Verify setpoints.
Verify with simulation. See Simu-
lation (3.4.) on page 215.
Verify with simulation. See Simu-
lation (3.4.) on page 215.
Verify setpoints.
2.1.2. Sen-
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