GE TransPort PT900 - Error Limits Configuration Details

Chapter 7. Configuring the Transmitter
TransPort
®
PT900 User’s Manual 125
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
ERROR
message is displayed on the measurement screen.
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
message is displayed on the measurement screen.
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.