Nivus osm-f, Operation Instruction Manual

Page: 88 / 103

Instruction Manual
OCM F
Page 88 OCM F - Rev. 04 as of 18.02.2014
®
11 Troubleshooting
Error Possible reasons Correction
No indication of flow
(>0<or >----<) Connection Check connection between sensor cable and ter-
minal strip. Check connection boxes, connections
for sensor cable extension or air compensation
element for correct connection or moisture. Sensor
cable connected to appropriate terminal clamp strip
(Ex or Non-Ex)?
Sensor Check sensor installation (towards flow direction,
horizontal installation).
Check sensor for soiling, sedimentation, silting (

to be removed) or mechanical damage or sensor
body and cable (

replace sensor).
Flow level measure-
ment
Important:
no flow level

no flow velocity meas-
urement possible!!
In case of Doppler level measurement: check sen-
sor for horizontal installation. Check sensor func-
tion in menu >I/O - >v-Histogram<.
In case of external level measurement: check func-
tion and signal transmission (cables, clamp con-
nections, short circuits and contact resistances).
In case of measurement with pressure cell: check
compensation channel at sensor body for obstruc-
tions. Remove yellow cap from filter element.
Check level measurement parameter "Fixed value“
in case measuring in full channel without using
level measurement.
Transmitter Call up error memory. Depending on error mes-
sages take the respective measures (check cables,
plug and socket connections, sensor installation).
Negative flow direction Check installation direction of the sensor, rotate
sensor if required.
If the flow direction is reversed only occasionally
and the measurement fails subsequently

set
min. value to -6,0 m/s in menu CAL-Flow vel. –
min. + max. value.
Programming Completely check the transmitter parameter set-
tings.
Display >Error Doppler
Sensor< Connection Check cable connection. Wiring on terminal strip
switched? Cables firmly connected to plugs (re-
tighten screws, pull at cable ends)? Insulation of
single wires unintentionally clamped in?
Communication Communication to sensor disturbed. Can be
checked by choosing menu I/O >Doppler-Info<.
Sensor should be indicated in the first line of the
following screen. Check cables for interruption or
loose connection. Check sensor for mechanical
damage.