User's Manual

Commissioning
Page 22
AdvancedDSP level calculation routine
Under certain installation conditions, the product level calculation can be done more accurately when the
AdvancedDSP level calculation routine is enabled.
In that case the calculated level is less sensitive for obstructions in the microwave path, like equalisation
holes in stilling well, welding seams and multipath effect from tank shell. Make sure that obstruction zones
are well defined (refer to section 3.4.4: Obstruction reflections).
It is advised to enable AdvancedDSP level calculation with the following antenna installation conditions:
• F08 antenna : when distance to tank shell is less than 0.15 times tank height;
• W06 and T06 antenna : when distance to tank shell is less than 0.1 times tank height;
• Stilling well antenna : always;
• RoD antenna : always.
3.4.3 Level check
Refer to figure 3.4. Check if there is a valid level reading. It is no problem if the value is incorrect, as long as
there are no error status messages. Two common error status messages are discussed below.
1) Level reading 999999999 with level status FL. Check error code item
EE
(this is an indexed item!).
If
EE
reads 07901, the maximum safe fill height (item
SF
) is set too high. Request for the “Antenna
minimum ullage“ (item
AU
). The following relation is valid: SF + AU < PR.
Either distance
PR
is not correct or the maximum safe fill height (
SF
) is too large for this installation.
2) If there is a “Warning code” present, check warning code item
WC
(this is an indexed item!).
If
WC
reads 07000, the reflected signal is not so strong that its peak rises above a threshold setting.
Lower the product zone threshold (or another zone threshold where the peak is found). Refer to section
3.4.4 for more information on zones and thresholds.
Item Name Description
W2
= Protection level 2 Enter password 2 (default password: ENRAF2)
RL
= Reference level Format according to item
LD
. The reference level is the actual
level in the tank (obtained from e.g. manual dip)
EX
Exit With the exit command, the actual level value in item
RL
is
written in NOVRAM. Only then the value of item
RL
will be used
with the next
AR
command
W2
= Protection level 2 Enter protection level 2 (default password: ENRAF2)
CM
Commissioning mode Enter the commissioning mode to accept the reference level
AR
Accept reference With this command, the 973 SmartRadar LT accepts the value
of the reference level and internally re-calculates the distance:
radar position (item
PR
). After the controlled reset, by the
EX
command, the level reading is available.
EX
Exit Exit protection level
With this procedure, the 973 SmartRadar LT now measures the level value, given in item
RL
, and all relative
level changes will be followed by the instrument.