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Scaling the analogue current output
This set of functions allows users to set up a scale. The minimum (4 mA) and maximum (20 mA) values of an analogue current output should ideally lay within the
device’s active measuring zone, as the device will freeze when the signal is lost.
Refer to the measurement limits chart for each probe type in the introduction.
Example procedure 2 (using EView2):
To personalise a measurement scale:
Select “Level” as the current output parameter for the scale to be set up from the tank bottom.
Select 4 – 20 mA current range with an error output at 22 mA.
Choose suitable minimum and maximum values for scaling.
Step
Action
Data entered / value set
1
Open the “DEVICE SETTINGS” window of the device in EView2
The device settings are read and displayed
2
Select the “Outputs” tab
3
Select the "Current generator mode" from the drop-down list within the
"Current output" section.
This field currently displays “Distance”
4
Use the mouse to scroll down (to) the data set field. Click on the new value. This field now displays “Level”
5
Select the “Error indication” drop-down list.
“Hold – last measured value” message is displayed in this field
6
Use mouse to scroll down data set field. Click on the new value.
This field now displays “22 mA”.
7
Select the „Assignment of 4 mA” data field.
This field currently displays “0.000 mm” (0 inch).
8
Enter the new value.
This will give the level that corresponds to the minimum output of 4 mA.
This field now displays “1000.000 mm” (39.37 inch).
9
Select the „Assignment of 20 mA” data field.
This field currently displays “6000.000 mm” (236.22 inch)
(std. default: 6000 mm).
10
Change to 9850 mm (387.8 inch).
This will give the level that corresponds to the maximum output of 20 mA.
(and sets max. output at the top dead zone limit)
This field now displays “8850.000 mm” (348.425 inch).
11
Press the “Send” button in the bottom right corner for the MicroTREK to
accept the new value.
12
Press the “X” button to quit the configuration menu.