GE TransPort PT900 User Manual page 141

7.3.4 Programming the ERROR LIMITS Menu (cont.)
To program the ERROR LIMITS menu, complete the following steps:
1. In the VELOCITY section, enter the desired MIN LIMIT and MAX LIMIT
values in the appropriate text boxes. If the measured velocity is outside
these limits, the E3: VELOCITY RANGE message is displayed on the
measurement screen.
2. In the AMPLITUDE section, enter the desired MIN LIMIT and MAX LIMIT
values in the appropriate text boxes. If the amplitude discriminator
measures a signal amplitude outside these limits, the E5: AMPLITUDE
message is displayed on the measurement screen.
ERROR
3. In the SOUND SPEED [+|-] section, enter the desired maximum percentage
of variation allowed from the sound speed programmed in the FLUID menu
(the default value is 20%). If the fluid sound speed exceeds the
programmed nominal value by more than this percentage, the E2: SOUND
SPEED ERROR
4. In the ACCELERATION section, enter the desired upper limit value in the
text box. If the measured velocity changes by more than this limit from
one reading to the next, the E6: CYCLE SKIP ERROR message is displayed
on the measurement screen.
5. In the COMPRESSION RATIO section, enter the desired upper limit value in
the text box. If the ratio of the correlation peak value to the secondary
peak value exceeds this limit, the E4: SIGNAL QUALITY ERROR message is
displayed on the measurement screen.
6. In the SOUND SPEED VARIATION RATE section, enter the desired upper
limit value in the text box. If the speed of sound varies by more than this
limit from one reading to the next, the E2: SOUND SPEED ERROR message
is displayed on the measurement screen.
7. In the SIGNAL LOW LIMIT section, enter the desired low limit value in the
text box. If the SNR (Signal to Noise Rate) is less than this limit or the
signal cannot be found when the flow is started, the E1: LOW SIGNAL
ERROR message is displayed on the measurement screen.
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TransPort PT900 User's Manual
message is displayed on the measurement screen.
Chapter 7. Configuring the Transmitter
125