Dwyer PUX - Manual (Page 78)

9 - 37
(2) Check to judge whether ultrasonic receiving signal waveform is normal or
not
q Normal waveform
The receiving waveform above is free of noise,
and so normal measurement is allowed.
w Abnormal waveform
The above receiving waveform is not covered
within the range of the ultrasound waveform. It
is displayed as “CALCULATION ERROR” or
“RECEIVED SIGNAL ERROR”.
Check the pipe setting and sensor mounting
dimensions.
When ultrasonic receiving signal waveform is
weakened by the effect of rust in the pipe,
abnormal waveform may result. Raise the
transmission voltage and perform measurement.
(See page 6-12).
SYSTEM CHECK
DATA / 1DIV
CURSOR
UP STREAM WAVE
2 0
5 0 0 0
272
SOURCE
1 0 4 4 6
SOUND SPEED SOUND SPEED 1 5 2 1 m / s 1 5 2 1 m / s
Peak value of about
15000 to 20000
TIME / 1DIV TIME / 1DIV
5000
SYSTEM CHECK
DATA / 1DIV
UP STREAM WAVE
2 0
5 0 0 0
112
SOURCE
- 6 2 8 9
SOUND SPEED SOUND SPEED 1 6 6 9 m / s 1 6 6 9 m / s
CURSOR
TIME / 1DIV TIME / 1DIV
Receiving wave-
form is cut off.
Receiving
range
BULLETIN F-68