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EUROLUBE EQUIPMENT AB
PART NO 53417
ANALOGUE LEVEL SENSOR
2
Some general information about the sensor technology that we’re using:
The 4-20mA current loop is a common method of transmitting sensor information in many industrial process-monitoring applications. A sensor
is a device used to measure physical parameters such as temperature, pressure, speed, liquid fl ow rates, etc. Transmitting sensor information
via a current loop is particularly useful when the information has to be sent to a remote location over long distances (1000 feet, or more). The
loop’s operation is straightforward: a sensor’s output voltage is fi rst converted to a proportional current, with 4mA normally representing the
sensor’s zero-level output, and 20mA representing the sensor’s full-scale output. Then, a receiver at the remote end converts the 4-20mA
current back into a voltage which in turn can be further processed by a computer or display module.
Installing the sensor consists of a few steps. They can be a bit complicated if you are not used to handling the system.
Read these steps before doing anything!
Connect the sensor as described in the first page.1.
Ensure that the breathing tube is exiting in the sealed connection box with hygroscopic filter. En-
sure that the indicator on the circuit board lights up when the sensor is connected. Do not put the
sensor in the tank yet!
Adjusting the meter range2.
Depeding on what sensor you have in your hand, an adjustment might be needed. Different suppliers of these sensors have dif-
ferent meter ranges. The sensor we used when we first introduced this system has a meter range of 0.400. This is why this is the
default value in the software. We have now in stock sensors that has both 0.400 and 0.500. This needs to be changed in the tank
module depending on which sensor you’ve got. For example, if the sensor is labelled “RANGE 0~5mH2O” it means it needs to be
changed to 0.500.
Do this by right-clicking the sensor in the Neighborhood and choosing Properties. At the bottom
of the window is a value called MeterRange. Change this to reflect the sensor you are currently
using. Repeat for all sensors.
Calibrating the zero level of the sensor.3.
There are two ways to do this, either using the PC (slow process, not very accurate) or, from the keypad (faster, somewhat more
robust). We strongly recommend using the keypad. Start by hanging the sensor outside the tank in the same height as the bottom
of the tank.
Using the PC3.1.
Look at the symbol in Neighborhood and see how many percent it shows in the tank when the sensor is outside the tank. Right-
click and choose Properties, then adjust the value Zero Offset. For example, if the sensor is showing 5%, type Zero Offset -0.1 to
decrease the reading and wait 1-2 minutes and observe the change in the sensor symbol. Repeat until it shows as close to 0% as
possible. However, the update frequency on the PC makes this a slow process and not very accurate.
Using the keypad3.2.
Start by going into the SETUP-meny on any keypad in the system. (Type SETUP followed by Enter,
then the password and then Enter).
In order to calibrate the sensor, we need to know how much the sensor is differing from the normal
value (4.00mA). We are now going to view the sensor reading in real time, from the tank module by
using what we call a “Fast Menu” code. Do this by typing at the Adress promt:
XXXX0Y61
Where XXXX = the address of the tank module and Y = the port# in the tank module. So if you for
example want to view port 2 on tank module 8002 you would type:
You will now see the current sensor signal in mA, something like this:
This tells us that the sensor is showing a little too much and we need to adjust it DOWN.
If the sensor is showing “Sensor out of scale”, it means that we need to adjust it UP.
Indicates when
sensor is present.
(Sensor connects here)
I=4.12mA 0.5%
*** CH2 Signal**
Addr:80020261
Address[CODE]
Reel:SETUP ‡
EXIT STOP CE ENT
PASS:_ ‡
Enter password
