eTape® liquid level sensors



The eTape® is a solid-state sensor with a resistive output that varies with the level of fluid (liquid or powder).  It does away with clunky mechanical floats and easily interfaces with electronic control systems.  The eTape® sensor envelope is compressed by the hydrostatic pressure of the fluid in which it is immersed.  This results in a change in resistance that corresponds to the distance from the top of the sensor to the surface of the fluid.  The sensor's resistive ouput is inversely proportional to the height of the liquid.  Therefore, the lower the liquid level, the higher the output resistance.  Conversely, the higher the liquid level, the lower the output resistance.


Product datasheets

Standard eTape Datasheet

Chemical eTape Datasheet


Specifications

Nominal Length

8-inch

12-inch

24-inch

32-inch

Sensor Length

10.2" (259 mm)

14.2" (361 mm)

26.0" (660 mm)

34.2" (869 mm)

Active Length

8.4" (213 mm)

12.4" (315 mm)

24.34" (618 mm)

32.4" (823 mm)

Sensor Output

400 - 1500 ohms ±20%

400 - 2000 ohms ±20%

400 - 4000 ohms ±20%

400 - 5000 ohms ±20%

Ref Resistance

1500 ohms ±20%

2000 ohms ±20%

4000 ohms ±20%

5000 ohms ±20%

 

Thickness: 0.015" (0.381mm) 

Width: 1.0" (25.4 mm)

Actuation Depth: Nominal 1” (25.4 mm)

Resistance Gradient: 150 ohms/inch (60 ohms/cm)

Power Rating: 0.5 Watts (VMax = 10V)

Resolution: < 0.01“(0.25 mm)

Connector: Male Crimpflex Pins

Temperature Range: 15°F - 150°F (-9°C - 65°C)


Sensor Output

The eTape® can be modeled as a variable resistor. The typical output characteristics of the sensor are show in the figure below.