Page 24 SITRANS Probe LU (HART) – OPERATING INSTRUCTIONS A5E32337695
Operation
To measure how much space remains in the vessel, select Space:
• Space returns a reading for the distance between current level and process full
level (Span)
To measure the distance from the transducer face to the current level, select Distance.
1
3. Set response time to maximum filling/emptying rate (P003:
Measurement Response)
Set P003 to a measurement response speed just faster than the maximum filling or
emptying rate (whichever is greater).
Slower settings provide higher accuracy; faster settings allow for more level fluctuation.
(For more detail on measurement response, see
P003 Measurement Response
, on
page 32.)
4. Select type of measurement units required (P005: Units)
Notes:
• Setting P001 resets Span (P007), unless Span has previously been set to a different
value. Span is set to Empty distance minus 110% of Blanking
1
, unless Operation is set
to distance measurement (P001 = 3). In this case, Span is set to the same value as
Empty (P006).
• Changing P001 may reset Output Function (P201): this applies to HART only.
1.
Blanking distance is 0.25 m (10"). See
Blanking Distance
on page 89 for more details.
Values
1* slow 0.100 m/minute
2 medium 1.000 m/minute
3 fast 10.000 m/minute
Values
1*meters
2
centimeters
3
millimeters
4
feet
5
inches
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