The linear resistance to current module plugs directly into our eTape®
sensors. The module is designed to convert the variable resistance output of the eTape®
liquid level sensor to a linear output current between 4 mA and 20 mA DC +/- 5%. Applying the output current of the module to a microcontroller, PLC or other current monitoring device can more accurately measure and monitor the liquid level output of the sensor.
The module is calibrated using a five-point calibration process at 0%, 25%, 50%, 75% and 100% of full scale. Connect the e-Tape sensor to be calibrated using the 4-pin socket.
(1) Hold down the calibration button while powering on the module. The red calibration LED will light up solid.
(2) With the sensor not submerged in liquid, press the calibration button once. The LED will flash slowly after a couple of seconds. Once the LED stops flashing, the zero point of the sensor is calibrated.
(3) Add liquid to submerge the eTape sensor to 25% level and press the calibration button again. The LED will flash slowly and once the LED stops flashing the 25% is calibrated. Repeat step 3 for the 50%, 75% and 100% levels. Following the 100% calibration, the LED will flash fast for several seconds. Once the LED stops flashing and stays off, the module and eTape are now calibrated. The module can be reset and recalibrated by repeating the process. Note: The calibration process can be done in reverse so that the measurement output is reversed (4mA output for high level and 20mA output for low level).datasheet 4-20mA