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MODEL 54e pH/ORP SECTION 8.0
TROUBLESHOOTING
TABLE 8-1. Diagnostic Messages
Diagnostic Messages Description of problem
"Cracked glass failure" Broken or cracked glass electrode
"Zero offset error" * Reference electrode poisoned.
"High reference imped" 1. Coated reference electrode (Sensor cleaning recommended)
2. Sensor out of process.
"Temp error high" 1. Open or shorted RTD
"Temp error low" 2. Temperature out of range
"Calibration warning" 1. Calibration suggested due to change in glass
2. Sensor out of process
"Old glass warning" 1. Glass electrode worn out
2. Sensor out of process
"Lo slope error"* 1. Worn out electrode
"Hi slope error"* 2. Improper buffer calibration (check buffer accuracy, wait for stabilization in buffers)
3. Plugged liquid junction/coated glass
"Sensor line open" 1. Open wire between sensor and controller.
2. Distance between sensor and controller is too long.
"Failure - EEPROM" 1. Defective CPU board. Notify Rosemount
"Failure - CPU" if cycling power does not clear the fault
"Failure - Factory"
"Failure - ROM" Bad "ROM" chip on CPU board
"Field cal needed" Output 1 and 2 need adjustment
"Hold mode activated" All relays open and outputs set to default values
(operator activated)
"High input voltage" Open connection from preamplifier to controller.
"Low input voltage" Open connection from glass electrode to preamplifier.
"High reference voltage" 1. Sensor not in process
2. Coated Sensor
3. Open wire between preamplifier and controller.
"Simulating Output 1 or 2" The indicated output or alarm is being tested. see Section 5.4
"Simulating Alarm 1, 2, 3, or 4"
"Feed limit alarm 1, 2, or 3" Indicated alarm has been on for longer than it's limit and has been turned off.
* Off line error messages will not initiate fault condition, and will display only once. The message will clear from
the screen when a key is pressed.
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