TVOC MANUAL
Ion Science Ltd
Page 14 of 32
5
Installation
5.4.2 Intrinsically Safe (IS) applications: Entry parameters
Input power
Ui = 18V
Ii = 800mA
Pi = 1.2W
Ci = 0
m
F
Li = 0mH
4-20mA power
Ui = 30V
Ii = 200mA
Pi = 1.2W
Ci = 0
m
F
Li = 0mH
For information only please see ATEX certificate before installation
Ion Science Ltd suggest using the following Zener Barriers for IS approved applications. Use competent
installation engineers and ask them for installation and application advice.
POWER SUPPLY: Suggested barriers for INLET power supply
Manufacturer
Manufacturers pt no.
Type
Cable length estimate
Fuchs
Z715
Zener barrier
~ 1115 meters
Fuchs
KFD2-SD2-EX1.1065
Galvanic isolator
~ 1217 meters
MTL
7715P+
Zener barrier
~ 772 meters
Stahl
9901/01-158-270-101
Zener barrier
~ 500 meters
Stahl
9143/10-156-065-10
Galvanic isolator
SIGNAL OUTPUT: Suggested barriers for 4-20mA OUTLET
Manufacturer
Manufacturers pt no.
Type
Fuchs
Z728
Zener barrier
Fuchs
KFD2STC4-Ex1
Galvanic isolator
MTL
MTL7787
Zener barrier
MTL
MTL5042
Galvanic isolator
Stahl
9001/01-280-110-141
Zener barrier
Stahl
9160/13-11-11
Galvanic isolator
NOTE
·
All cable lengths are estimated for zone 1 IIC installation of the equipment
·
Using 1mm
2
C.S.A conductor S.T.P cables with capacitance per meter of 250pF/m, L/R ratio of
25uH/
W
conductor resistance at 20
°
C of 18.4
W
/km.
·
Calculation assumes cables are at 50
°
C.
WARNING! Intrinsically Safe (IS) applications
·
Units should not be powered using non IS power supplies prior to installation in an IS application.
·
If non IS power is supplied the unit will require inspection by Ion Science Ltd or an Ion Science
Approved Service Centre prior to installation in an IS application.
·
TVOC fuses may not be replaced in the field.
·
If a fuse is blown TVOC will require inspection by Ion Science Ltd or and Ion Science Approved Service
Centre before it is used in an IS application.
