Example

Prerequisites

Sensor: temperature sensor, measuring range -50 to 100°C

Temperature to be measured 25°C

Order of events with WindLGC

  1. The sensor converts the temperature from 25°C to a voltage value of 5.0 V.

  2. IDEC SmartRelay converts the 5.0 V to the standardized value 500.

  3. Using the sensor and measurement range data, IDEC SmartRelay ascertains the value 0.15 for the gain and the value -50 for the offset.
    According to the formula:
    Analog value = (standardized value x gain) + offset
    IDEC SmartRelay calculates as analog value:
    Analog value = (500 x 0.15) - 50 = 25

Order of events with IDEC SmartRelay

  1. The sensor converts the temperature from 25°C to a voltage value of 5.0 V.

  2. IDEC SmartRelay converts the 5.0 V to the standardized value 500.

  3. From the sensor and measuring range data you must establish the values for gain and offset.
    According to the formulas:
    Gain = (maxSensor
    - minSensor) / (maxnorm - minnorm)
    and
    Offset = minSensor
    - (Gain x minnorm)
    it follows that
    Gain = (100
    - (-50)) / (1000 - 0) = 0.15
    Offset = -50
    - (0.15 x 0) = -50

  4. According to the formula
    Analog value = (standardized value x gain) + offset
    IDEC SmartRelay calculates as analog value:
    Analog value = (500 x 0.15) - 50 = 25

Additional examples

 

Physical quantity

Electric quantity of sensor

Standardized value

Gain

Offset

Analog value

 

0 V

5 V

10 V

0

500

1000

 

0.01

 

0

0

5

10

 

4 mA

12 mA

20 mA

0

500

1000

 

10

 

0

0

5000

10000

 

0 mA

10 mA

20 mA

0

500

1000

 

1

 

50

50

550

1050

1000 mbar

3700 mbar

5000 mbar

0 V

6.75 V

10 V

0

675

1000

 

4

 

1000

1000

3700

5000

-30 °C

0 °C

70 °C

0 mA

6 mA

20 mA

0

300

1000

 

0.1

 

-30

-30

0

70