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Contents
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Settings tab
To configure a sensor, go to "Main menu" >> "System tree" and click on the sensor element in the tree. A modal window with sensor properties will pop up. Change the needed settings and click "OK" or "Apply" at the bottom of the "Properties" window.
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All sensors include:
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Name |
The name is given by |
the system automatically. You can change it to anything you want. |
ID | System ID of the element |
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Type |
Examples: temperature, humidity, vibration |
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Class | Examples: analog, CAN, switch, discrete |
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Hardware port |
The external port number on the device panel to which the sensor is connected (if the sensor is external). |
All sensors have threshold controls:
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On In the picture above, the "Current value" equals 2441.5 0 and is represented by the small triangle. Currently, the triangle is red green because it is situated in an the "High alarmNormal" range above "High alarm level", which equals 20.0. Hence the sensor says that the "Current state" is "High alarmNormal". This value is used by the system's "Logic schemes" menu to notify the administrator or take action.
Hysteresis
Sensors have the option of setting the hysteresis state. Hysteresis can be a time, a value or it can be disabledisabled.
If the hysteresis is set in a time, the sensor will transit transmit to a new state with a delay of the specified number of seconds in the corresponding field. The time counting will begin from the moment when the measured value value of the sensor has left the current range.
Each state has its field. Which determines the time that the sensor value must continuously hold for the state to change to the specified.
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If you set the hysteresis by value, the sensor transition to a new state will occur when the measured value of the sensor exits beyond the current range, adjusted for the specified hysteresis value.
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You can calibrate the sensors. Use K and B coefficients. After the calibration, please, save the values in flash memory.
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To save sensor properties in the device's flash memory press " |
Tuning sensor readings by a linear formula "y = k * x + b"
Default settings
In rare cases, the sensor readings may be too high or too low. End sensor readings can be adjusted using the linear formula. Consider the following example of a temperature sensor:
We have the linear formula:
y = k * x + b
Where:
x = self determined temperature sensor reading
y = temperature sensor reading that have to be shown (true)
k, b = the coefficients in the formula
By default:
k = 1
b = 0
In this case:
y = 1 * x + 0
y = x
We have the following schedule:
The graph shows that for each value of x = y.
Sensor tuning
For proper tuning of the temperature sensor from example above, we will need additional diagnostic temperature sensor with more accurate readings. Using both sensors you need to measure the readings of the two sensors in the same place, at the same time. For a more precise determination of "k" and "b" values we should try to take two valuee of one sensor with a more distant values:
We measure two values of both sensors. For example:
When x = 25°C; y = 27°C
When x = 30°C; y = 31.5°C
Where
x = temperature sensor reading of Vutlan sensor
y = sensor reading of a more accurate testing temperature sensor
We put all the values in the formula, and we get two formulas::
k * 25 + b = 27
k * 30 + b = 31.5
Using simple math we find both values "k" and "b":
k = 0.9
b = 4.5
And we get the following formula:
y = 0.9 * x + 4.5
We can draw a graph for this formula:
We type in "k" and "b" values in sensor configuration panel.
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Example: Why do we need to use HysteresisLet’s say that we have a temperature sensor. Let’s say that we have set up threshold values. We have set the value 25.5 °C to be a threshold value between Normal/Alarm states. If the temperature drops just below 25.5 °C You will have a “Normal” state. If the temperature goes just above 25.5 °C You will have a “Warning” state. Sometimes the temperature may stay at 25.5 °C and jump up and down by 0.1-0.3 °C. In this case, You will get too many notifications that the sensor is showing a Warning or Normal state. In this case, we need to use a Hysteresis. If the type “time” is chosen, the system will wait for a specified time before the State of the sensor is declared. If type “value” is used, unless the temperature drops by a larger amount than specified, the sensor state will not be declared. |
Tuning the sensor value
Sensor readings can be tunned by a linear formula "y = k * x - b"
Example VT407 + HAT-100Q1 / AC current converter:
Metered current for HAT: from 0 to 100A (This means that the range equals 100, k = 100)
The output of VT407 is 0-5V (That means that the range is equal to 5)
"b" = the value that the sensor shows in WebUI when there's no current. Let's say that b = + 0.021
You should use the following formula for HAT: 100/5*(x-y)
The expression formula would be 20*(x-0.021)
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Point is used as a decimal separator (3.14) |
Charts tab
The charts tab shows the following:
Display chart for |
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Refresh data | Start | Poll a sensor |
Reset all charts | Reset all | Clears all saved data for the sensor. |
Export data | XML or CSV | Exporting data through WebUI does not work for more than a couple of days and is very rough. If you need detailed log data, use the logging of sensor values to the media. Note: Make sure no endpoint security services used in the network are not blocking the download of XML and CSV files. |
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Reset smoke sensors
If analog sensors like VT560 / Smoke detector/ sensor detects smoke or fire, it will go into “Alarm” mode. Alarm mode can only be switched off manually using the Reset smoke detectors panel or using the onboard sensor Analog sensor power reset is found in the “System tree” >> “Onboard”.
Child pages
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