3D TRASAR
5500 - Installation & Operation Manual
521-OM0108.88
Copyright
2009 Nalco Company
9-6
Technical Help
(630) 305-CHEM
Problem
Possible Cause(s)
Solution
Conductivity
(uS/cm) is
displayed as
dashes.
A Conductivity Sensor Error is active.
Check the conductivity probe
connections in the controller. Replace
probe if all connections are seated
tightly and the error persi sts after power
off/on.
A Temperature Sensor Error is active.
Check the conductivity connections in
the controller. S ince the RTD is
embedded in the conductivity probe,
replace the conductivity probe if all
connections are seated tightly and the
error persists after power off/on.
Value of -999 is
logged in datalog.
The measurement is invalid.
A sensor error or some other conditi on
is present, which is causing the
measurement to be invalid. Check the
active alarm list on the display. F or
Bio-Index, -999 is logged for the first 2
hours after powerup, which is normal
and requires no resolution. F or Scale
Index, this will occur after the learning
period and immediately after power
cycle.
Confusing numbers
are logged in the
datalog in the relay
status fields.
The numbers correspond to the relay state.
The relay states are :
129 Auto on
128 Auto off
65 Manual on
64 Manual off
33 Failsafe on
32 Failsafe off
16 Forced off
9 Flow failsafe on
8 Flow failsafe off
0 Not controlled
