EGE-Elektronik Spezial-Sensoren GmbH - Special-Sensors for Automation

Flow Sensors - Setting instructions

Switching output

Setting with flow off

1. Install the sensor in the flow duct and switch on the device. 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. Switch on the device. 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 probe.

1. Install the sensor in the flow duct and switch on the device. 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 probe.

1. Install the sensor in the flow duct and switch on the device. 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 with two potentiometers for coarse and fine adjustment. If the flow velocities are higher than the detection limit of the connected probe, flow failure or reduction will be displayed once the medium flow velocity has dropped back within the probe detection range.


Adjustment of the limit temperature

The desired values can be set using a potentiometer. The output is actuated when the set value is exceeded. At the same time, the corresponding LED lights up.


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. If the set time lag has not yet elapsed, the yellow LED will remain alight, even though the red LED indicates flow failure.


Automatic adjustment for SKM 522

Simultaneously pressing the two front buttons will open the programming menu. The automatic adjustment is selected with the FUNCTION button and started with the SELECT button. The adjustment is completed a few seconds later when at least the yellow LED lights up. Flow rate and temperature must be kept constant before and during the adjustment process. The function MAN. ADJUST can subsequently be used to manually modify the switching point.


Analog 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 "Adjust" . The lowest value (>4 mA, 1st green LED) is set with the "Adjust" potentiometer at the smallest flow speed to be monitoring and the highest value (20 mA, 5th 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.


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