Flow Sensor Setting Instructions

Switching Point

Setting with flow off

  1. Install the sensor in the flow duct and apply power. Wait for ready state.
  2. Carry out the potentiometer adjustment so that the red LED lights up.
  3. When the medium begins to flow, at least one green LED should light up.

 

Setting with flow on

  1. Install the sensor in the flow duct and subject it to flow. Apply power. Wait for ready state.
  2. Carry out the potentiometer adjustment so that two green LEDs light up.
  3. If the flow is interrupted, the red LED should light up.

Setting for flow below threshold

This adjustment is only possible if the flow rate lies within the measuring range of the chosen sensor.

  1. Install the sensor in the flow duct and apply power. Apply the specified flow. Wait for ready state.
  2. Set the potentiometer so that the red LED just lights up.
  3. When the flow increases, the red LED is extinguished, the yellow LED lights up and the sensor switches.

Setting for flow higher than threshold

This adjustment is only possible if the flow rate lies within the measuring range of the chosen sensor.

  1. Install the sensor in the flow duct and apply power. Apply the specified flow. Wait for ready state.
  2. Set the potentiometer so that the first green LED lights up.
  3. If the flow rate decreases the green LED will extinguish first, then the yellow LED then the relay drops out and the red LED will light up.

The switch point for flow velocity is set at the switching amplifiers SKZ. and SKM. with two potentiometers for coarse and fine adjustment. If the flow velocities are higher than the detection limit of the connected sensor, flow failure or reduction will be displayed once the medium flow velocity has dropped back within the sensor detection range.

Time delay and limit temperature of medium

Desired values can be set by means of a potentiometer located on the switching amplifier.
Values are indicated on a scale for SKZ... models. All other models have a 20 step setting potentiometer. Turning clockwise increases time or temperature values.
If the set time lag has not yet elapsed, the yellow LED will remain alight, even though the red LED indicates flow failure.

Setting Instructions For Flow Sensors

Analogue output

The SKM 420 GA supplies a current intensity which depends on the flow speed. The output current range is defined from 4 mA to 20 mA. The dependence between flow speed and output current is non-linear. The detection range is adjusted over two potentiometers: "Range ( ) and "Compensation" ( ). The lowest value (>4 mA, 1. green LED) is set with the "Compensation" potentiometer at the smallest flow speed to be monitoring and the highest value (20 mA, 5. green LED) is set with the "Range" potentiometer at the highest flow speed to be monitored. The graph shows the characteristic lines obtained with the different settings.

Setting Instructions For Flow Sensors

Product search

This product search tool allows you to find the most appropriate sensor to suit the application, with selections for medium (liquid, gas, glycol), power supply, flow rate, supply voltage, output type, connection type, temperature range and ATEX category.

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