Ultrasonic Level Transmitter
ULM84 Series User Manual
Dec.2020
Page 21 of 21
FAHM Co.
Industrial Automation
Doc. ULM84 Rev.99-12
“No Echo” screen (Refer to Figures 9 or 22)
No fluctuation, but wrong displayed value
FAHM Co.
FARABOARD HOUSHMAND MIHAN
Main Office: Unit 8, 4
th
Floor, No.37, Tohid St., Tehran, Iran
Tel: +98 21 66123710-3, Fax: +98 21 66123714
Factory: San’at 2
nd
St, Garmsar Industrial Zone.
Tel: +98 23 34557295, Fax: +98 23 34557296
E-Mail:
"No Echo"
screen
Liquid is over range
Wrong / unreasonable Deadband setting
(refer to P06 Dead band)
Power supply mismatch
Poor liquid surface
reflection
Bubbles on liquid surface
Floating things on liquid
surface
Uneven surface
Unsuitable enviromental
conditions
Faulty Proble; unable to transmit waves
Decreased Probe
sesetivity
High temp. or overpressure
Probe surface damaged
Used for a long time
Water inside
transmitter
Wrong data
but no
fluctuation
Distance is
correct, but
wrong level
Probe hight parameter is wrong.
Distance is
half real
value
No obstacle
Increase the Deadband
Change device location
Transmitter is tilted
Tank ambient is
not air
Change Sound Speed parameter
Distance is a
scaled value of
actual value
Deadband is wrong.
Liquid is inside
Deadband
Probe in the center
of a dome tank
Change installation
location
