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Operation
4.5 Inputs FTC
The three inputs FTC1, FTC2, and FTC3 are used for the external control of the unit.
The inputs FTC1, FTC2, and FTC3 are controllable via the DataTemp Multidrop
Software!
4.5.1 Emissivity Setting (analog)
The FTC1 input can be configured to accept an analog voltage signal (0 to 5 VDC) to provide real time
emissivity setting. Each input can support one head. The following table shows the relationship between
input voltage and emissivity:
Table 2: Ratio between Analog Input Voltage and Emissivity
Example:
This process requires setting the emissivity:
for product 1:
for product 2:
Following the example below, the operator needs only to switch to position "product 1" or "product 2".
Figure 21: Adjustment of Emissivity at FTC Input (Example)
4.5.2 Emissivity Setting (digital)
The electronics of the sensors contains a table with 8 pre-installed settings for emissivity. To activate
these emissivity settings, you need to have the inputs FTC1, FTC2, and FTC3 connected. According to
the voltage level on the FTC inputs, one of the table entries will be activated.
0 = Low signal (input at 0 V)
28
Emissivity value (analog input)
Emissivity value (digital input)
Ambient Temperature Compensation
Trigger/Hold/Laser
Table 1: Use of the external inputs
U in V
0.0
Emissivity
0.1
0.90
0.40
+ 5 VDC
R1 = 200 Ω
4.0 V (ε=0.9)
R2 = 500 Ω
1.5 V (ε=0.4)
R3 = 300 Ω
Rev. B2 Feb 2017
FTC1 FTC2 FTC3
x
x
x
x
0.5
...
4.5
5.0
0.2
...
1.0
1.1
"Product 1"
To the FTC1
input
"Product 2"
x
x
XR
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