APG LPU-2127 user manual - Manual (Page 12)

LPU-2127 Rev. A5, 1/14
12
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Operation (continued)
MODE DESCRIPTION PARAMETERS
4 Response Time Range = 1-3
Default = 1
1 = 3.3 ft/min (1m/min)
2 = 15ft/min (4.5m/min)
3 = >15 ft/min (4.5/min)
Mode 4 is used to select the desired response time. The response time
adjustment is the limit to which the LPU-2127 can keep up with different rates
of change. The response time parameter automatically sets internal filter
parameters for the programmed rate of change. More filter equates to a steadier
output. The most filter is used in setting 1, the least in setting 3.
MODE DESCRIPTION PARAMETERS
5 Fail-safe Range = 0 - 2
Default = 1
0 = hold last
1 = 22 mA
2 = 3.75 mA
Mode 5 sets the output condition that the sensor will revert to in the event of
a loss of echo condition. If this mode is set to 0, the sensor will hold the last
reading until the signal is regained. If set to 1, the output of the sensor will go
to 22 mA If set to 2, the output will go to 3.75 mA.
MODE DESCRIPTION PARAMETERS
6 Fail-safe Units = Seconds
Delay Range = 5-9999
Default = 15
Mode 6 sets the delay, in seconds, before the output will show a loss of echo
condition. When the LPU does not receive an echo, it will hold the last valid
condition for the number of seconds entered in Mode 5. When this time has
expired, the display and output will change to their fail-safe settings.
Most applications do not require the user to manipulate modes beyond 6.