Other Troubleshooting - General - Emerson Rosemount FCL-01 Reference Manual

Reference Manual
00809-0200-3412
10.6.4 pH readings are moderately noisy and tend to wander
Potential cause
pH readings that are moderately noisy (±0.1 pH) and tend to wander are probably caused
by bubbles getting trapped against the pH sensor.
Although the overflow sampler is designed to allow bubbles to escape before they reach
the pH sensor, and the sensor itself is designed so trapped air bubbles don't interfere with
the measurement, bubbles may occasionally be a problem.
Recommended actions
10.7

Other troubleshooting - general

Problem
Current output is too low.
Alarm relays do not operate properly.
10.7.1 Current output is too low
Load resistance is too high. Maximum load is 550 Ω.
10.7.2 Alarm relays don't work
Recommended actions
Rosemount FCL 56
1. Shake the sensor to dislodge the bubbles.
2. If bubbles remain a problem, contact the factory.
1. Verify the relays are properly wired.
2. Verify the relays are properly configured.
See Section
Current output is too low
Alarm relays don't work
Troubleshooting
October 2023
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