Spectrex 20/20MI - Mini Triple IR (IR3) Flame Detector User Manual
Page 51
Spectrex Inc. - SharpEye
TM
Mini IR3 Flame Detector Manual – TM 787100, Rev. D April 2011
43
Appendix B: Intrinsically Safe Connection For
20/20MI-XX-X-C
The 20/20MI-XX-X-C is intrinsically safe certified per ATEX Ex II 1GD, EEx ia IIC
T4. This model does not include the relay outputs.
In order to comply with the intrinsic safety requirements, barriers/ galvanic
isolators must be incorporated. This section will recommend types of barriers and
connection. To comply with Intrinsic safety requirements, any barriers/isolators
that will comply with parameters of the detector certification or lower and allow
proper operation of the detector will be acceptable.
The attached list is for example only.
a.
For power line
- MTL 5021, MTL5022, P&F KFD2-SL2-EX 1.B
b.
For 4-20mA output - MTL 7787, P&F KFD2-CR-Ex 1.30-300
c.
For RS-485 line
- MTL 7766AC
The Flame Detector limitation parameters, per input/output, are as follows:
Pin
Ref
Ui
Ii
Pi
Ci
Li
1 Vin
2 GND
30V 200mA 1W
0
0
3 4-20
mA
IN
4 4-20
mA
OUT
30V 200mA 0.5W
0
0
5 RS485A+
6 RS485B-
±12V 80mA 1W
0
0
7 Fault
relay
8 Fault
relay
rtn
30V X
X
0
0
9 Alarm
relay
10 Alarm
relay
rtn
30V X
X
0
0
11
Shield
0
0 0 0 0
12
EXT_BIT_SW 0
0 0 0 0