114
NO. INDICATION LIKELY REASON SOLUTION
11 Flow reading is
slow to react to
the set point or
unstable (jumps
up and down).
The instrument valve
PID loop parameters
were changed or not
properly set.
Use “Restore Valve PID”menu
selection to restore factory original
PID parameters settings (see Section
6.4.4).
The differential
pressure across
instrument is too
high.
Reduce differential pressure across
instrument inlet and outlet ports (see
Section 5 “Specifi cation” for
instrument pressure limits).
12 The Digital RS-232 or
RS-485
i communication
interface is not
responding on
commands from
Host PC.
The communication
interface wiring is
not correct.
Make sure the communication
port is wired according to selected
interface type (see Section 3.4 and
Figure 3).
1. The selected Host
PC communication
port is not active
or has different
number.
2. The instrument
has different RS-485
address (applicable
for RS-485 interface
only).
Make sure proper communication
port is selected and port settings
are correct. For RS-485
instruments make sure that each
device on the RS-485 bus has
unique address.
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