User guide

I-E67-84-1B February,2002 13-4
condition triggers the Fault icon to energize
and the Safe Mode outputs to enable (i.e., the
Analog Output One and Two currents are fixed
high or low based on the configured Safe Mode
levels). These diagnostic indicators provide
local and remote reporting capability.
Table 13-3 contains all the Error Codes
supported by the TB84PH Advantage Series
analyzer. Each entry lists the Error Code
number, displayed text string, and a short
description of the fault condition. See
Section 14, Troubleshooting, for resolving a
fault condition.
Table 13-3. Error Code Definitions
Error Text Description
Codes String
EC1 HI.PV.AD Over range Process Variable A/D.
EC2 LO.PV.AD Under range Process Variable A/D.
EC4 TC.PCB Toroidal conductivity board with pH/ORP/pION firmware.
EC5 DO.PCB Dissolved Oxygen board with pH/ORP/pION firmware.
EC6 TE.PCB Two-electrode conductivity board with pH/ORP/pION
firmware.
EC7 EC.PCB Four-electrode conductivity board with pH/ORP/pION
firmware.
Calibration Diagnostic Messages
The TB84PH Advantage Series analyzer performs
automatic efficiency and offset calculations
relative to a theoretically perfect
electrochemical and/or temperature sensor
during each calibration cycle. Calibration
history is retained for future interrogation
using the Edit Calibrate State. The
calibration constants that are displayed are
Efficiency and Offset for the Process Variable
and Slope and Offset for the Temperature.
An Efficiency of less than 60% or greater than
110% indicates a potentially bad process
calibration point or poor performing sensor.
Calibration values that yield Efficiency
values less than 40% or greater than 150% are
not accepted. In these cases, the text string
BAD.CAL (i.e., bad calibration) is displayed
in the secondary display region. The user is
returned to the beginning of the calibration
cycle after the bad calibration has been
reported.