Installation

5.4.1 Emissivity Setting (analog controlled)

The input FTC1 can be configured to accept an analog voltage signal (0 to 5 VDC) to provide real time emissivity setting. The following table shows the relationship between input voltage and emissivity.

U in V

Emissivity

0.0

0.5

4.5

5.0

0.1

0.2

1.0

1.1

 

 

 

 

 

Table 4: Ratio between Analog Input Voltage and Emissivity

Example:

The process requires the setting of emissivity:

for product 1: 0.90

for product 2: 0.40

Following the scheme below, the operator needs only to switch to position “product 1” or “product 2”.

 

 

+ 5 VDC

 

 

 

 

 

“product 1”

 

 

 

R1 = 200 Ω

 

4.0 V (ε=0.9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To the input FTC1

R2 = 500 Ω

 

 

 

 

 

1.5 V (ε=0.4)

 

of the sensor

 

 

 

 

 

 

 

 

“product 2”

R3 = 300 Ω

 

 

 

Figure 14: Adjustment of Emissivity at Input FTC1 (Example)

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MI

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RayTek MI Miniature Infrared Sensor operating instructions Emissivity Setting analog controlled