Diagnostics And Troubleshooting; Diagnostics; Fault Mnemonics; Rtd Resistance Values - Emerson Rosemount 1054B Instruction Manual

MODEL 1054B pH/ORP

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.
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.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
SECTION 8.0
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.
TABLE 8-1. Fault Mnemonics
Display
OId
SEn
SHt
SLP
tcH/trH
tcL/trL
Std
TABLE 8-2. RTD Resistance Values
Temperature
0 °C
10 °C
20 °C
30 °C
40 °C
50 °C
60 °C
70 °C
80 °C
90 °C
100 °C
DIAGNOSTICS AND TROUBLESHOOTING
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.
Description
Electrode worn out, coated, or non-immersed.
Sensor line error or wire length error.
Glass electrode cracked or broken.
Slope variance error.
High temperature compensation error.
Low temperature or shorted RTD.
Standardization error.
Resistance
100.00 ohms
103.90 ohms
107.79 ohms
111.67 ohms
115.54 ohms
119.40 ohms
123.24 ohms
127.07 ohms
130.89 ohms
134.70 ohms
138.50 ohms
SECTION 8.0
39