Auxiliary Calculation Function; Fluid Flow Direction Setting; Rate Limit Function Setting - YOKOGAWA Admag TI Series User Manual

5.5

Auxiliary Calculation Function

5.5.1

Fluid Flow Direction Setting

The arrow indicated on the surface of the sensor indicates a fluid flow direction. At shipment from
the manufacturing factory, a flow rate is measured assuming that the arrow direction is forward.
By changing the parameter settings, this product can measure the flow rate, assuming that the
reverse direction is forward against the arrow direction.
The setting can be configured with the following parameter.
Menu path
Display
F
OUNDATION
Fieldbus
Block Relative
Name Index
STB 88
From the table below, select the fluid flow direction.
Selection
Display
Forward
Reverse
5.5.2

Rate Limit Function Setting

If the rate limit function is used, it becomes possible to reduce noises that cannot be all cleared
only by lengthening the damping time constant. When a step signal or a sudden signal due to a
slurry fluid is input, this function judges whether the signal is a flow rate signal or a noise signal.
This judgment is made based on the high/low limit value (rate limit value) and the rate limit
function continuation time (dead time), causing the noise signal over the rate limit value to be cut
off.
The rate limit value should be specified with the percentage (%) for the span of the process value
PV-mapped in Subsection 5.1.2. If the rate limit function is not used, set "0" to the dead time.
The setting can be configured with the following parameters.
Menu path
Display
F
OUNDATION
Fieldbus
Block Relative
Name Index
STB 89
STB 90
STB 91
Device setup ► Detailed setup ► AUX calculation ► (see below)
Device Configuration ► STB ► Device Configuration ► Configuration ► AUX Calculation
► (see below)
Parameter
Display
Flow direct Flow Direction
F
OUNDATION
Fieldbus
Forward The arrow direction of the sensor is forward.
Reverse The reverse direction of the arrow of the sensor is forward.
Device setup ► Detailed setup ► AUX calculation ► (see below)
Device Configuration ► STB ► Device Configuration ► Configuration ► AUX Calculation
► (see below)
Parameter
Display
Rate limit Rate Limit
Dead time Dead Time
Noise filter Noise Filter
<5. Functions>
F Fieldbus
OUNDATION
Description
F Fieldbus
OUNDATION
Description
Specifies the fluid flow
direction.
Description
Specifies the rate limit value.
Specifies the dead time.
Specifies the noise filter (rate
*1
limit value and dead time).
IM 01E21A02-03EN
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