51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter
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P75 Actual Deadzone Distance
P05 is used to set the deadzone distance. P75 is a readout
only parameter that shows the actual deadzone value that
the unit uses for diagnostic purposes.
1.6.8 Open Channel Flow Head and Totalizers
P76
Head of Flow
Head is the "h" value used in the calculation formula
selected in P40. It is the distance from the zero flow eleva-
tion in the flume or weir, to the surface of the water. P76
displays the current head value based on the level in the
flume or weir, and the values that were put in for P40 –
P46. If the unit has not been set up for open channel flow,
P76 can not be viewed.
P77
Resettable totalizer (T1)
P77 displays the value of the resettable totalizer used for
open channel flow. To reset T1:
1. While in P77, press NEXT
+ DOWN
simultaneously
2. The display will indicate "t1 CLr"
3. Press ENTER
to clear (reset) the totalizer
P78
Non-resettable totalizer (T2)
P78 displays the value of the non-resettable totalizer used
for open channel flow.
1.6.9 Output Test Parameters
P80
Current (mA) output test
P80 can be used to test the mA current output from the
transmitter—to make sure it agrees with an external meter.
When entering P80, the actual mA current output will be
displayed. Press
to set any value between 3.8 and 20.5
mA. Check the mA current output by using either a multi-
meter or an external display. Return to the parameter
address (P80) by pressing ENTER
.
