27
51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter
P64 – P66 indicate temperatures that the transducer has
been exposed to:
Should the platinum temperature sensing element become
damaged, "PtErr" will be displayed. Refer to
Section 1.8,
Diagnostic Error Codes,
for a listing of all the error codes.
P70
Echo Map
P70 displays the number of echoes being detected by the
transmitter. Entering P70 will save the current echo map,
and the distance and amplitude of each echo can be indi-
vidually displayed.
If more than one echo is detected, then the Measuring
Window can be manually moved to one of the echoes
displayed in the echo map:
1. Press the ENTER
key to enter into the echo
map
2. Press the UP
or DOWN
keys to select the
proper echo (the display indicates the distance of
the selected echo)
3. Press the ENTER
key to load the selected
echo into the 338 transmitter
Parameters P71 through P73 display data concerning the
Measuring Window. These are readout only parameters.
P74 Signal to Noise Ratio
P74 gives an indication of the ratio between the return
ultrasonic signal received by the transducer and the
amount of electrical and acoustic noise that is also being
received.
Parameter
Units
Description
P64
° F or ° C Current temperature of the transducer
P65
° F or ° C
Maximum temperature the transducer has
been exposed to
P66
° F or ° C
Minimum temperature the transducer has
been exposed to
Parameter
Description
P71
Distance of the Measuring Window
P72
Amplitude of the echo in the Measuring Window
P73
Position of the echo (in milliseconds)
S/N Ratio
Measurement conditions
Over 70
Excellent
Between 70 and 30
Good
Under 30
Unreliable
Number of
echoes in
the echo map
ENTER
YY serial number
of the echo
xx value of
DIST or AMPL
ENTER
UP, DOWN
UP, DOWN
NEXT
NEXT
NEXT
70:_ _xx
yy: xxxx
(distance)
yy: xxxx
(amplitude)
yy: xxxx
(distance)
yy: xxxx
(amplitude)
