Emerson 396PVP Diagnostics and Troubleshooting, Diagnostics & Troubleshooting

396P + 396PVP Sensors Instruction Manual	Section 6: Diagnostics & Troubleshooting
LIQ_MAN_396P_396PVP	August 2013

Section 6: Diagnostics and Troubleshooting

6.154e/56/1056/1057/1066/3081/4081/5081/XMT Diagnostics and Troubleshooting

Many Rosemount Analytical Instruments and Transmitters automatically search for fault condi- tions that would cause an error in the measured pH value. Refer to the applicable Instruction Manual for a complete description of the analyzer’s fault conditions.

Table 7-1, below, lists some of the diagnostic messages that indicate a possible sensor problem. A more complete description of the problem and a suggested remedy corresponding to each message is also listed.

TABLE 6-1. Troubleshooting with Advanced Diagnostics

DIAGNOSTIC MESSAGE	DESCRIPTION OF PROBLEM	REMEDY
“Calibration Warning”	1. Aged glass.	1. Perform buffer calibration.
CALIbrAtE	2. Sensor not immersed.	2. Be sure electrode measuring tip
		is in process.
“Cracked glass failure”	Broken or cracked glass.	Replace sensor.
6LASS fAIL
“High reference impede”	1. Liquid junction coated.	1. Clean sensor; replace if necessary.
rEF fAIL or rEF WjArn	2. Reference Cell gel depleted.	2. Replace sensor.
	3. Sensor not immersed.	3. Be sure electrode measuring tip
		is in process.
“Input voltage high”	pH input shorted or sensor	Check wiring. Replace sensor if
“Input voltage low”	miswired.	necessary.
“Old glass warning”	1. Glass electrode worn out.	1. Replace sensor.
6LaSS WjArn	2. Sensor not immersed.	2. Be sure electrode measuring tip
		is inprocess.
“Reference offset err”	Reference electrode poisoned.	Replace sensor.
(offline only)
Std Err
“Ref voltage high”	1. Reference shorted or sensor miswired.	Check wiring and installation.
“Ref voltage low”	2. Sensor not immersed	Replace sensor if necessary.
“Sensor line open”	1. Open wire between sensor and analyzer.	1. Check sensor wiring.
LInE FAIL	2. Interconnecting cable greater than	2. Relocate analyzer.
	1000 ft.
“Sensor miswired”	1. Open wire between sensor and analyzer.	1. Check wiring.
	2. Bad preamplifier.	2. Replace preamplifier. (Code 02 only)
“Temp error high”	1. Open or shorted RTD.	1. Replace sensor.
“Temp error low”	2. Temperature out of range.	2. Check process temperature.
tEMP HI
tEMP LO

Diagnostics and Troubleshooting 41