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level sensor problem

2/18/2019 4:12 PM	Rate (0)
Richardphd Posts: 2 Rating: (0)	Hello A Logo plus AN2 coupled to a 4 to 20mA level sensor and a solenoid valve is used to control the water level in a tank. However when the independent power supply to the level senor failed the tank overfilled. Presumably because 0mA was interpreted as low level. Is there an exemplar diagram available for a fail-safe design, whereby in the event of 0mA from the level sensor the solenoid remains closed? Many thanks Richard
Richardphd Posts: 2 Rating: (0)
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2/18/2019 4:20 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/13/2025 Posts: 35957 Rating: (4501)	Hello Richardphd, first of all, welcome to the forum. In this case, you have to select the sensor type 0-20 mA instead of 4-20 mA and convert your measuring range accordingly. Then you can evaluate the value to less than 4 mA. Write which physical measuring range the sensor has and I'll give you an example. 4 mA =? 20 mA =?

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2/18/2019 4:45 PM	Rate (0)
Richardphd Posts: 2 Rating: (0)	Thanks for the quick response. It is a Deeter LVCS2, i.e. with a 500 mm sensing range as per attached data sheet. Attachment Deeter-LVCS-Liquid-Level-Sensor-LVCS-1-LVCS-2-LVCS-3-LVCS-4---Spec-Sheet.pdf (269 Downloads)
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2/18/2019 5:02 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/13/2025 Posts: 35957 Rating: (4501)	Here's the example. Attachment Different_ settings_for_4-20mA_sensor_0BA8.Standard.zip (268 Downloads)

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This contribution was helpful to 1 thankful Users Richardphd

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