Emerson ROSEMOUNT 5081-A Instruction Manual page 107

MODEL 5081-A
15.2.8 EECHECSUn
EE Chksum Error means a software setting changed when it was not supposed to. the EEPRoM may be going bad. Call
the factory for assistance.
15.2.9 EEOF
EE Buffer Overflow means the software is trying to change too many background variables at once. Remove power from
the transmitter for about 30 seconds. If the warning message does not disappear once power is restored, call the factory
for assistance.
15.2.10 EE Error
EE Write Error usually means at least one byte in the EEPRoM has gone bad. try entering the data again. If the error
message continues to appear, call the factory for assistance.
15.2.11 bAd gnd
this warning message means there is a problem with the analog circuitry. Call the factory for assistance.
15.2.12 FACtCAL
this warning message means the transmitter requires factory calibration. Call the factory for assistance.
15.2.13 SLOPE HI or SLOPE LO
once the two-point (manual or automatic) pH calibration is complete, the transmitter automatically calculates the sensor
slope at 25°C. If the slope is greater than 62 mV/pH the transmitter displays the SLOPE HI error. If the slope is less than
45 mV/pH, the transmitter displays the SLOPE LO error. the transmitter will not update the calibration.
1. Check the buffers. Inspect the buffer solutions for obvious signs of deterioration, such as turbidity or mold growth.
Neutral and slightly acidic buffers are highly susceptible to molds. Alkaline buffers (pH 9 and greater), if they have been
exposed to air for long periods, may also be inaccurate. Alkaline buffers absorb carbon dioxide from the atmosphere,
which lowers the pH. If a high pH buffer was used in the failed calibration, repeat the calibration using fresh buffer. If
fresh buffer is not available, use a lower pH buffer. For example, use pH 4 and pH 7 buffer instead of pH 7 and pH 10
buffer.
2. Allow adequate time for temperature equilibration. If the sensor was in a process liquid substantially hotter or colder
than the buffer, place it in a container of water at ambient temperature for at least 20 minutes before starting the cali-
bration.
3. If manual calibration was done, verify that correct pH values were entered.
4. Verify all wiring connections, including connections at a junction box.
5. Check the pH sensor for cleanliness. If the sensor looks fouled or dirty, clean it. Refer to the sensor instruction manu-
al for cleaning procedures.
6. Replace the sensor.
SECTION 15.0
TROUBLESHOOTING
101