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MODEL 1054B pH/ORP
SECTION 8.0
DIAGNOSTICS AND TROUBLESHOOTING
SECTION 8.0
DIAGNOSTICS AND TROUBLESHOOTING
8.1 DIAGNOSTICS.
The Model 1054B has a diag-
nostic feature which automatically searches for fault
conditions that would cause an error in the measured
pH/ORP value. If such a condition occurs, the current
output and relays will act as configured in Section 4.8
and the fault flag and display will flash. A fault code
mnemonic will display at frequent intervals. If more
than one fault condition exists, the display will
sequence the faults at one second intervals. This will
continue until the cause of the fault has been correct-
ed. Display of fault mnemonics is suppressed when in
Set Mode. Selecting the
SHO
item will display a history
of the two most recent fault conditions unless
SHO
was
cleared. Refer to Section 4.8C.
NOTE
If the analyzer is in hold and a fault
occurs, the mnemonic
HLd
will display
during the fault sequence.
8.1.1 Fault Mnemonics.
Table 8-1 lists the fault
mnemonics and describes the meaning of each.
8.1.2 Temperature Compensation.
Table 8-2 is a
ready reference of RTD resistance values at various
temperatures. These are used for test and evaluation
of the sensor.
NOTE
Ohmic values are read across the RTD
element and are based on the manu-
facturer’s stated values (±1%). Allow
enough time for the RTD element to
stabilize to the surrounding temperature.
TABLE 8-1. Fault Mnemonics
Display Description
CAL
Warning to calibrate or clean sensor.
CHS
ROM failure (check sum error) (bad ROM chip).
COP
Computer not operating properly.
EEP
EEPROM write error (bad EEPROM chip).
FAC
Factory calibration required.
inH
Input shorted.
inL
Sensor miswired.
Display
Description
OId
Electrode worn out, coated, or non-immersed.
SEn
Sensor line error or wire length error.
SHt
Glass electrode cracked or broken.
SLP
Slope variance error.
tcH
/
trH
High temperature compensation error.
tcL
/
trL
Low temperature or shorted RTD.
Std
Standardization error.
TABLE 8-2. RTD Resistance Values
Temperature
Resistance
0 °C
100.00 ohms
10 °C
103.90 ohms
20 °C
107.79 ohms
30 °C
111.67 ohms
40 °C
115.54 ohms
50 °C
119.40 ohms
60 °C
123.24 ohms
70 °C
127.07 ohms
80 °C
130.89 ohms
90 °C
134.70 ohms
100 °C
138.50 ohms
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