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SENSORS / LIQUID/FLOW / 12" CHEMICAL ETAPE LIQUID LEVEL SENSOR WITH TEFLON JACKET
DESCRIPTION
The Chemical eTape Liquid Level Sensor is a solid-state sensor with a resistive output that
varies with the level of the fluid. It does away with clunky mechanical floats, and easily interfaces
with electronic control systems. What separates this from our other eTape Liquid Sensor is
the Teflon (FEP) jacket that is rated for use in chemical, petroleum, and food safe
applications
The eTape sensor's 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 output is inversely proportional to
the height of the liquid: the lower the liquid level, the higher the output resistance; the higher the
liquid level, the lower the output resistance.
This is a very unique sensor, we haven't seen anything else that is affordable and accurate for
measuring liquid level. This particular sensor is the 12" model, we also include a 4-pin
connector and 560 ohm resistor. The connector is so you don't have to solder directly to the
delicate pins: instead, just solder to the connector and plug it onto the sensor.
Since the sensor is resistive, it is easy to read it using a microcontroller/Arduino ADC pin. Check
the tutorials tab for a quick-start pointer.
New Products 4/9/2014
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12" Chemical eTape
Liquid Level Sensor
with Teflon Jacket
PRODUCT ID: 1786
1 IN STOCK
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DESCRIPTION
TECHNICAL DETAILS
TECHNICAL DETAILS
Dimensions:
305mm x 25mm / 12" x 1"
Weight: 5g
Sensor Length: 361mm / 14.2"
Thickness: 0.38mm / 0.02"
Tech Specs:
Sensor Output: 400-2000Ω ±20%
Ref. Resistance: 2000Ω ±20%
Actuation Depth: Nominal 25.4mm / 1"
Resistance Gradient: 60Ω/cm / 150Ω /inch
Power Rating: 0.5 Watts
Temperature Range: 15°F - 150°F / -9°C - 65°C
Chemical eTape Datasheet
We don't have a detailed tutorial for this sensor but it acts very much like a thermistor so we
suggest checking out that tutorial for background, and then following these instructions:
Connect pin #2 of the sensor to ground, then pin #3 to a 560 ohm resistor. The other side of
the 560 ohm resistor to VCC (3.3V or 5V for example) to create a resistor divider. The ADC pin
connects to the point between the resistor and sensor.
// the value of the 'other' resistor
#define SERIESRESISTOR 560
// What pin to connect the sensor to
#define SENSORPIN A0
void setup(void) {
Serial.begin(9600);
}
void loop(void) {
float reading;
reading = analogRead(SENSORPIN);
Serial.print("Analog reading ");
Serial.println(reading);
// convert the value to resistance
reading = (1023 / reading) ‐ 1;
reading = SERIESRESISTOR / reading;
Serial.print("Sensor resistance ");
Serial.println(reading);
delay(1000);
}
Then look in the App Note for the conversion between resistance and liquid level.
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