Intrinsically Safe (Is) Applications - ION TVOC Instrument User Manual

TVOC MANUAL
5 Installation
WARNING!
The label on the enclosure details the IS and nA certifications. The appropriate section of the ATEX label
should be covered up or blocked out to reflect the type of installation. For Non ATEX applications the label
should be covered completely. For ATEX zone 2 applications with out safety barriers the ia certification
details should be blanked out. For Zone 1 or 2 IS applications with safety barriers the nA certification details
should be covered.
This will prevent safety discrepancies and or mis-use in the future should the equipment be moved or the
site be re-defined as a hazardous area.
5.4.2 ATEX nA (Non sparking) applications for Zone 2 areas only: Entry parameters
Input power
4-20mA power
For information only please see ATEX certificate before installation
The wiring of ATEX nA systems is identical to the wiring showing for non ATEX applications. The only
difference is the requirements to ensure that the power supplied used provides 24v or less in normal
operation.
5.4.3 Intrinsically Safe (IS) applications: Entry parameters
Input power
4-20mA power
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
Pepperl+Fuchs
Pepperl+Fuchs
MTL
Stahl
Stahl
SIGNAL OUTPUT: Suggested barriers for 4-20mA OUTLET
Manufacturer
Pepperl+Fuchs
Pepperl+Fuchs
MTL
MTL
Stahl
Stahl
NOTE
 All cable lengths are estimated for zone 1 IIC installation of the equipment
2
 Using 1mm C.S.A conductor S.T.P cables with capacitance per meter of 250pF/m, L/R ratio of
25uH/ conductor resistance at 20C of 18.4/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
5 to 24Vdc 80mA max
8-35Vdc. 22mA
Ui = 18V Ii = 800mA
Ui = 30V Ii = 200mA
Manufacturers pt no.
Z715
KFD0-SD2-EX1.1065
7715P+
9901/01-158-270-101
9143/10-156-065-10
Manufacturers pt no.
Z728
KFD2STC4-Ex1
MTL7787
MTL5042
9001/01-280-110-141
9160/13-11-11
Page 13 of 28
Pi = 1.2W Ci = 0F
Pi = 1.2W Ci = 0F
Type Cable length estimate
Zener barrier
Galvanic isolator
Zener barrier
Zener barrier
Galvanic isolator
Type
Zener barrier
Galvanic isolator
Zener barrier
Galvanic isolator
Zener barrier
Galvanic isolator
Ion Science Ltd
Li = 0mH
Li = 0mH
~ 1115 meters
~ 1217 meters
~ 772 meters
~ 500 meters