Deviation Alarm which detects the difference of the water level
The dust eliminator is used at sand basin of sewage treatment plant. It is controlled to operate by comparing the water levels. Across the filter, water levels are compared and the dust eliminator is operated when the difference becomes greater. We are considering to use a deviation alarm that accepts signals from 2 sets of 2-wire type level sensors. Two relay outputs are used for alarming “water-level difference normal” and start operating the dust eliminator at “water-level difference abnormal”. It is also required the current loop supply as there is no power source available where sensors are installed.
We propose the combination (Figure 1) of Deviation Alarm (model: AYDV) and Current Loop Supply (model: M5DY). Level sensors are powered by M5DY, and their signals are transmitted to AYDV. Select AYDV’s both output 1 and 2 as below, and set their setpoint separately.
Relay; SPDT or transfer contact coil energized with deviation > set point
The dust eliminator is used at sand basin of sewage treatment plant. It is controlled to operate by comparing the water levels. Across the filter, water levels are compared and the dust eliminator is operated when the difference becomes greater. We are considering to use a deviation alarm that accepts signals from 2 sets of 2-wire type level sensors. Two relay outputs are used for alarming “water-level difference normal” and start operating the dust eliminator at “water-level difference abnormal”. It is also required the current loop supply as there is no power source available where sensors are installed. 
We propose the combination (Figure 1) of Deviation Alarm (model: AYDV) and Current Loop Supply (model: M5DY). Level sensors are powered by M5DY, and their signals are transmitted to AYDV. Select AYDV’s both output 1 and 2 as below, and set their setpoint separately.