AQ M-Tech AB Ultrasound Controller Manual 23
Example: Level Switch 1 detecting liquid, Level Switch 2 connected but not set, Level Switch 3
need to be calibrated, Level Switch 4 not existing, Relay1 closed.
SETTINGS
Through the SETTINGS-menu the parameters of the Level Switch can be set.
Select SET Type AND Technique to set it to either Type: KS,MK,MS,LS, Technique: ECHO or Type: RS,
Technique: WR or Type KS,MK,LS Technique WR or Type: MK Technique: Dual or No Level Switch.
Select SET DISTANCE to reflecting wall to set it between 46mm (minimum) and 600mm (maximum).
This parameter is needed if the “ECHO” technique is chosen and should be set to actual distance.
It does not have to be exact, just use the nearest value. If Technique is set to WR this setting is
not needed.
Select SET FILTER to set the filter-time between 0,5s 1s 2s or 4s. It determines how fast the Level
Switch detects air or liquid.
Select SET Jacket to set the distance in mm between jacket and container. Set it only if the
container has a jacket.
Select SET FREQUENCY to set the measurement frequency. This setting is dependent of the
container wall material and thickness. Usually it can be set to Auto unless a particular frequency is
known to be the best. 1=1,3MHz, 2=1,5MHz, 3=1,7MHz, 4=2,0MHz or 5=2,2MHz). Changing the
FREQUENCY does not change the calibration.
Select SET RELAY to set how the relays should act. Each relay have one normally open contact
(at power off and when sensor is not connected the relay is open).). There are four relays and
each relay can be controlled independently by any Level Switch. Choose between Closed with air
or closed with liquid. It is also possible to set one relay to be controlled by two Level Switches.
Example (pump filling a container): LS1 is placed high and LS2 is placed low on a container.
The relay is set to: Open LS1 Liq, Closed LS2 Air. When liquid level drops below LS2, the relay closes
(starting the pump to fill the container). When liquid level rises to LS1, the relay opens (stopping
the pump).
Example (pump emptying container): LS1 is placed high and LS2 is placed low on a container.
The relay is set to: Open LS2 Air, Closed LS1 Liq. When liquid level rises to LS1, the relay closes
(starting the pump to empty the container). When liquid level drops to LS2, the relay opens
(stopping the pump).
Container with jacket
In a container with a jacket the small space between the container and the jacket is filled with
liquid to regulate the temperature of the inner container. This is a special case when a Level
Switch KS can use the Technique set to WR and Jacket set to the distance between the jacket and
container walls. Measurements will then be made on the inner container using the WR technique.
The space between the jacket and container must be filled with liquid.
CALIBRATION
Select CALIBRATION to calibrate the Level Switch. Each Level Switch must be calibrated after
installation. Calibration must be done both for liquid and for air. The order or the time between the
calibration of air and liquid is of no importance.
A new calibration has to be done if the Level Switch is moved and should be done if the
temperature or the liquid properties has changed significantly since the last calibration. To see
how well the Level Switch behaves at different temperatures or with a different liquid the
measurement data can be checked.
To Next Page
Loading...
Need help?
General