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464

P1-P2
Description
The eTape sensor is a solid state, continuous (multi-level) fluid level sensor for measuring levels in
water, non-corrosive water based liquids and dry fluids (powders). The eTape sensor is
manufactured using printed electronic technologies which employ additive direct printing
processes to produce functional circuits.
Theory of Operation
The eTape sensor's envelope is compressed by hydrostatic pressure of the fluid in which it is
immersed resulting in a change in resistance which corresponds to the distance from the top of
the sensor to the fluid surface. The eTape sensor provides a resistive output that is inversely
proportional to the level of the liquid: the lower the liquid level, the higher the output resistance;
the higher the liquid level, the lower the output resistance.
Specifications
Sensor Length: 14.1" (358 mm) Resolution: < 0.01“(0.25 mm)
Thickness: 0.015" (0.381mm) Actuation Depth: Nominal 1” (25.4 mm)
Width: 1.0" (25.4 mm) Reference Resistor (Rref): 2250 , ±10%
Active Sensor Length: 12.4" (315 mm) Connector: Crimpflex Pins
Sensor Output: 2250 empty, 400 full, ±10% Temperature Range: 15°F - 150°F (-9°C - 65°C)
Resistance Gradient: 150 /inch (59 /cm), ±10% Power Rating: 0.5 Watts (VMax = 10V)
Sensor Output
The eTape can be modeled as a variable resistor (400 – 2250 Ω ± 10%). The typical output
characteristics of the eTape sensor are show in the figure below:
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
2.10
2.20
2.30
2.40
0 1 2 3 4 5 6 7 8 9 10 11 12 13
Sensor Output (Kohms)
Liquid Level (Inches)
Typical eTape Sensor Output - PN 12110215TC-12
Milone Technologies, Inc - 17 Ravenswood Way - Sewell, New Jersey 08080 - Phone: (856) 270-2688
Email: info@milonetech.com Web: www.milonetech.com
eTape
Continuous Fluid Level Sensor
PN-12110215TC-12
TM
Connection and Installation
Connect to the eTape by attaching a 4 pin connector with pre-soldered wires to the Crimpflex
pins. Do not solder directly to the Crimpflex pins. The inner two pins (pins 2 and 3) are the
sensor output (Rsense). The outer pins (pins 1 and 4) are the reference resistor (Rref) which can
be used for temperature compensation. Suspend the eTape sensor in the fluid to be
measured. To work properly the sensor must remain straight and must not be bent vertically or
longitudinally. For best results install the sensor inside a section of 1-inch diameter PVC pipe.
Double sided adhesive tape may be applied to the upper back portion of the sensor to
suspend the sensor in the container to be measured. However, the liquid must be allowed to
interact freely with both sides of the sensor. The vent hole located above the max line allows
the eTape to equilibrate with atmospheric pressure. The vent hole is fitted with a hydrophobic
filter membrane to prevent the eTape from being swamped if inadvertently submerged.
Sample Circuits
Custom Applications
The eTape sensor can be manufactured in custom lengths to fit any application.
Contact Milone Technologies if you have an application that requires specific
length, configuration or output characteristics.
Technical Support
If you require technical support for the eTape liquid level sensor, please contact our technical
support department by email at: techsupport@milonetech.com.
Milone Technologies, Inc - 17 Ravenswood Way - Sewell, New Jersey 08080 - Phone: (856) 270-2688
Email: info@milonetech.com Web: www.milonetech.com
eTape
Continuous Fluid Level Sensor
PN-12110215TC-12
TM
P1-P2

464

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