6
Echotel Model 919 Ultrasonic Level Switch
2.6
Configuration
Configuration for Model 919 relay units is made by selecting either HL (high level), or LL (low level)
via the two-position switch on the PC board. Figure 11 can be used for proper failsafe configuration.
Configuration for the all voltage version is made by selecting either DRY-ON for high level failsafe, or
WET-ON for low level failsafe. Figure 12 can be used for proper failsafe configuration.
NO
CM
NC
Energized
De-energized
Energized
De-energized
"HL"
(High level
failsafe)
"LL"
(Low level
failsafe)
Mode
Level
Relay
Current
NO
CM
NC
NO
CM
NC
NO
CM
NC
Energized
De-energized
Energized
De-energized
between
7 and 500 mA
between
7 and 500 mA
less than 7 mA
less than 7 mA
"DRY-ON"
(High level
failsafe)
"WET-ON"
(Low level
failsafe)
Mode
Level
Load
Current
Figure 11
Failsafe Relay Configuration
Figure 12
Failsafe All voltage Configuration
