TVOC 2 MANUAL
Ion Science Ltd
Page 14 of 32
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Installation – Hazardous location
Warning:
The label on the enclosure details both Zone 1 and Zone 2 certifications. The appropriate section of the Intrinsically
Safe label should be covered up or blocked out to reflect the type of installation. For Non-intrinsically Safe applications
the label should be covered completely. For Zone 2 applications without safety barriers the ia certification details
should be blanked out. For Zone 1 or Zone 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.
Entry parameters for Zone 2 only, nA (non-sparking) areas:
Input (Power)
Ui = 24V
Output (4-20 mA)
Ui = 35V
For information only: please see Intrinsically Safe operation certificate before installation.
The wiring of Zone 2 systems is identical to the wiring showing for non-intrinsically Safe applications. The only
difference is the requirement to ensure that the power supply used provides 24 V or less in normal operation.
Entry parameters for Intrinsically Safe, Zone 1 or Zone 2 installations:
Input (Power)
Ui = 18V
Ii = 800mA
Pi = 1.2W
Ci = 0
µ
F Li = 0mH
Output (4-20mA)
Ui = 30V
Ii = 200mA
Pi = 1.2W
Ci = 0
µ
F Li = 0mH
For information only please see Intrinsically
Safe certificate before installation
Ion Science Ltd suggest using Zener barriers for IS approved applications. Use competent installation engineers and
ask them for installation and application advice.
Warning:
Intrinsically Safe (IS) and Zone 2 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 2 fuses may not be replaced in the field.
•
If a fuse is blown TVOC 2 will require inspection by Ion Science Ltd or an Ion Science Approved Service Centre
before it is used in an IS application.
WARNING
– Potential
Electrostatic Charge Hazard
The unit should be installed and maintained to avoid the build-up of electrostatic charge on the front label:
Do not install TVOC or TVOC 2 where they will be brushed by fabric.
Clean only with a damp cloth.
WARNING
– Cable glands or blanking plugs must be fitted.
WARNING -
DO
NOT
REMOVE
OR REPLACE
FUSE
WHEN
ENERGI
ZED
CAUTION
– The unit must be installed with the opening in the sensor housing pointing downwards.
