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 |
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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”.
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| + 5 VDC |
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| “product 1” | |
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R1 = 200 Ω |
| 4.0 V (ε=0.9) | ||
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| To the input FTC1 |
R2 = 500 Ω |
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| 1.5 V (ε=0.4) |
| of the sensor |
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| “product 2” | |
R3 = 300 Ω | ||
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Figure 14: Adjustment of Emissivity at Input FTC1 (Example)
24 | MI |