RayTek MI3 - Digital Emissivity Selection and Ambient Temperature Compensation

Inputs
44 Rev. G Nov/2015 MI3
Figure 25: Adjustment of Emissivity at FTC Input (Example)
7.2 Emissivity (digital)
Function:
emissivity (digital control)
Signal:
digital low/high
Terminal:
FTC1-3, GND
The box electronics 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 (0 V)
1 = High signal (from 5 V to VDC)
A non-wired input is considered as not defined!
Table entry
Emissivity
(Examples)
FTC3
FTC2
FTC1
0
1
2
3
4
5
6
7
1.100
0.500
0.600
0.700
0.800
0.970
1.000
0.950
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Figure 26: Digital Selection of Emissivity with FTC Inputs
The values in the table cannot be changed through the control panel.
7.3 Ambient Temperature Compensation
Function:
Ambient Temperature Compensation
Signal:
0 to 5 VDC
Terminal:
FTC2, GND
“product 1”
“product 2”
4.0 V (ε=0.9)
1.5 V (ε=0.4)
To the FTC input
of the box
R1 = 200 Ω
R2 = 500 Ω
R3 = 300 Ω
+ 5 VDC