Mechanical flow switch LABO-RT-S

for liquidsprecisionhigh-pressure

A turbine acts as the primary sensor; its rotational speed is proportional to the flow rate. The rotational speed is detected by means of pre-tensioned Hall sensors, i.e. there are no magnets in the flow space. The integrated converter / counter make available an electronic switching output (push-pull) with adjustable characteristics (minimum/maximum) and hysteresis, which responds when an adjustable limit is fallen short of or exceeded. The switching value can be set to the currently existing flow using "teaching". Models with analog or pulse output are also available. Operation and programming The switching value is set as follows: ● Apply the flow rate to be set to the device. ● Apply an impulse of at least 0.5 seconds and max. 2 seconds duration to pin 2 (e.g. via a bridge to the supply voltage or a pulse from the PLC), in order to accept the measured value. ● When the teaching is complete, pin 2 should be connected to 0 V, so as to prevent unintended programming. The device has a yellow LED which flashes during the programming pulse. During operation, the LED serves as a status display for the switching output. In order to avoid the need to transit to an undesired operating status during the teach-in, the device can be provided ex-works with a teach-offset. The teach-offset point is added to the currently measured value before saving. The offset point can be positive or negative.