GE TransPort PT900 - Transducer Problems and Diagnostic Parameters; Diagnostic Parameters Overview

Chapter 8. Error Codes and Troubleshooting
132 TransPort
®
PT900 User’s Manual
8.2.2c Transducer Problems
Ultrasonic transducers are rugged, reliable devices. However, they are subject to
physical damage from mishandling and chemical attack. Contact GE for assistance
if you cannot solve a transducer-related problem.
8.3 Diagnostic Parameters
If you suspect fluid, pipe, transducer or electrical problems with your PT900
system, the diagnostic parameters listed in Table 16 below are available to help
you troubleshoot the problem. To display these parameters, see “Displaying the
Diagnostics Parameters” on page 100.
Table 16: Available Diagnostic Parameters
Parameter Description Good Bad
Transit Time Up Transit time of upstream signal N/A N/A
Transit Time Dn Transit time of downstream signal N/A N/A
Delta T Difference between upstream and
downstream transit times
N/A N/A
Signal Quality
Up
Quality of upstream signal ≥1200 <400
Signal Quality
Dn
Quality of downstream signal ≥1200 <400
Amplitude
Discrete Up
Amplitude discriminator value of
upstream transducer
19~29 <19 or >29
Amplitude
Discrete Dn
Amplitude discriminator value of
downstream transducer
19~29 <19 or >29
Signal Noise
Rate Up
Signal to noise ratio of upstream
signal
≥4<4
Signal Noise
Rate Dn
Signal to noise ratio of downstream
signal
≥4<4
Gain Up Upstream gain in db 9~85 <9 or >85
Gain Dn Downstream gain in db 9~85 <9 or >85
Peak Up Peak value of upstream correlation
signal
N/A N/A
Peak Dn Peak value of downstream
correlation signal
N/A N/A
Peak Percent Up % of peak of upstream signal N/A N/A
Peak Percent Dn % of peak of downstream signal N/A N/A