Ion Science Hydrosteel 7000 - Manual (Page 13)

Hydrosteel 7000 MANUAL Ion Science Ltd
Page 13 of 43
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Electrical connections (IS) with safety barriers
Yellow Connector
Thermocouple
junction box Thermocouple
2
3
E SCREEN
+V RD
0V BK
Red Connector
SA
FE
A
RE
A
1
SCREEN
+V RD
0V BK
1
E
3
2
SCREEN
0V BK
+V RD
2
E
3
1
Blue Connector
Hydrosteel 7000
0V
+V
BK
RD
4-20mA 1
0V
+V
0V
RD
BK
Power
+V
BK
RD
4-20mA 2
Control equipment
Installation
Ion Science Ltd suggest using the following or similar safety barrier or IS isolator for IS approved
applications. The system must be designed by a suitably trained engineer and approved by the local safety
authority.
Power Supply:
Suggested barriers for INLET power supply
Manufacture Manufactures pt. no. Type Cable length estimate
m
Pepperl & Fuchs KFD2-VD-Ex1.1835 Galvanic Isolator
560
Stahl 9175-10-16-11 Galvanic Isolator
335
MTL Ltd MTL4023 Galvanic Isolator 365
MTL Ltd MTL7728P Zener barrier 288
Turck MK72S06-EX Galvanic Isolator 686
* Note

All cable lengths are estimated for Zone 1 IIC installation of the equipment

Using 1 mm
2
C.S.A. conductors S.T.P. cables with capacitance of 250 pF/m, L/R ratio of 25 uH/

conductor resistance at 20

C of 18.4

/Km

Calculation assumes that cables are at 80

C (maximum operating temperature).
Signal Output
Suggested barriers for 4-20mA OUTLET
Manufacture Manufactures pt. no. Type
Pepperl+Fuchs Z728 Zener barrier
Pepperl+Fuchs KFD2STC4-Ex1 Galvanic isolator
MTL MTL7787 (dual channel) Zener barrier
MTL MTL5044 (dual channel) Galvanic isolator
Stahl 9001/51-280-110-141 Zener barrier
Stahl 9160/13-11-11S Galvanic isolator
WARNING! Intrinsically safe (IS) applications
HY7K fuses may not be replaced in the field.
If a fuse is blown the Hydrosteel 7000 will require inspection by Ion Science Ltd or and Ion Science Approved
Service Centre before it is used in an IS application.