Emerson Process Management 3081 pH/ORP Section Troubleshooting, Factory Assistance and Repairs

MODEL 3081 pH/ORP	SECTION 12.0
	TROUBLESHOOTING

SECTION 12.0

TROUBLESHOOTING

12.1WARNING AND FAULT MESSAGES

12.2CALIBRATION ERRORS

12.3TROUBLESHOOTING - GENERAL

12.4TROUBLESHOOTING WHEN A DIAGNOSTIC MESSAGE IS SHOWING

12.5TROUBLESHOOTING WHEN NO DIAGNOSTIC MESSAGE IS SHOWING

12.6SYSTEMATIC TROUBLESHOOTING

12.7DISPLAYING DIAGNOSTIC VARIABLES

12.8TESTING THE TRANSMITTER BY SIMULATING pH

12.9FACTORY ASSISTANCE AND REPAIRS

12.1 WARNING AND FAULT MESSAGES

The Model 3081 pH/ORP transmitter continuously monitors the measurement loop (sensor and transmitter) for conditions that cause erroneous measurements. When a problem occurs, the transmitter displays either a warning or fault mes- sage. A warning alerts the user that a potentially system disabling condition exists. If the condition causing the problem is not corrected, there is a high probability that the system will soon fail. A fault alerts the user that a system disabling con- dition exists. If a fault message is showing, all measurements should be regard- ed as erroneous.

When a WARNING condition exists:

1.The main display remains stable; it does not flash.

2.A warning message appears alternately with the temperature/output display. See Figure 12-1. See Section 12.4 for an explanation of the different warn- ings and suggested ways of correcting the problem.

When a FAULT exists:

1.The main display flashes.

2.The words FAULT and HOLD appear in the main display.

3.A fault message appears alternately with the temperature/output display. See Figure 12-2. See Section 12.4 for an explanation of the different fault mes- sages and suggested ways of correcting the problem.

4.The output current will remain at the present value or go to the programmed fault value. See Section 8.3 Output Ranging for pH Measurements, or Section 10.3 Output Ranging for ORP Measurements for details on how to program the current generated during a fault condition.

5.If the transmitter is in HOLD when the fault occurs, the output remains at the programmed hold value. To alert the user that a fault exists, the word FAULT appears in the main display, and the display flashes. A fault or diagnostic message also appears.

6.If the transmitter is simulating an output current when the fault occurs, the transmitter continues to generate the simulated current. To alert the user that a fault exists, the word FAULT appears in the display, and the display flash- es.

FIGURE 12-1. Warning

Annunciation

When a non-disabling problem occurs, a warning message appears alternately with the temperature/ out- put display.

FIGURE 12-2. Fault Annunciation

When a disabling condition, a fault, occurs, the display appears as pic- tured above. To further alert the user that measurements are in error, the display flashes. Diagnostic mes- sages appear in the temper- ature/output area on the screen.

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