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The Interface Solution Experts
THZ
2
&
TDZ
2
Programmable Smart HART
Temperature Transmitter and Display
Installation in Hazardous
Locations’
This page contains information for the THZ
2
and TDZ
2
instruments when used within an intrinsically-safe
system.
The diagram on the following page must be used for
units that are to operate in areas requiring intrinsically-
safe instrumentation.
Refer to the
Special Conditions
outlined below before
proceeding with installation.
Special Conditions of Use
The following instructions must be adhered to when
the THZ
2
and TDZ
2
are used in hazardous ‘Classified’
locations and potentially explosive atmospheres.
I. Intrinsically Safe (Ex ia) Applications
(Zones 0 and 1)
1. The Models THZ
2
and TDZ
2
Temperature
Transmitters shall be installed in a final enclosure
rated for a minimum of IP20.
2. For Zone 0 installations, the final enclosure shall
not contain more than 10% in total of aluminum,
magnesium, titanium and zirconium, or 7.5% in total of
magnesium, titanium and zirconium.
3. For Zone 1 installations, the final enclosure shall
not contain 7.5% in total of magnesium.
4. Wiring must be rated for 85°C.
II. Type N (Ex n) Applications (Zone 2)
1. As Category 3 equipment, the Models THZ
2
and
TDZ
2
Temperature Transmitters shall be installed in
an enclosure which maintains an ingress protection
of IP54 and meets the enclosure requirements of
EN60079-0 and EN60079-15.
2. The Models THZ
2
& TDZ
2
Temperature
Transmitters shall contain external transient protection
to prevent the supply voltage from exceeding 46.2V
including tolerance.
3. Wiring must be rated for 85°C.
Safety Concerns
For your safety, read the following information carefully
before proceeding with installation.
WARNING:
EXPLOSION HAZARD – FOR
DIVISION 2 HAZARDOUS LOCATIONS. DO
NOT DISCONNECT EQUIPMENT WHEN A
FLAMMABLE ATMOSPHERE IS PRESENT.
WARNING:
SUBSTITUTION OF COMPONENTS
IS NOT ALLOWED AS IT MAY IMPAIR THE
INTRINSIC SAFETY (ZONES 0 & 1, DIVISION 1)
OF THE UNIT AND/OR THE NON-INCENDIVE/
TYPE N (DIVISION 2, ZONE 2) CIRCUIT. DO NOT
OPEN THE UNIT WHEN EITHER ENERGIZED OR
WHEN AN EXPLOSIVE GAS/DUST ATMOSPHERE
IS PRESENT. DISCONNECT POWER BEFORE
SERVICING. READ AND UNDERSTAND THE
MANUFACTURER’S INSTALLATION AND
OPERATING PROCEDURES, AND ADHERE TO
ALL APPLICABLE ELECTRICAL CODES, SAFETY
INSTRUCTIONS AND REGULATIONS.
AVERTISSEMENT –
RISQUE D’EXPLOSION. NE
PAS DEBRANCHER TANT QUE LE CIRCUIT EST
SOUS TENSION, A MOINS QU’IL NE S’ AGISSE
D’UN EMPLACEMENT NON DANGEREUX.
WARNING:
END-USER MUST MARK EITHER
CHECKER BOX ON THE INSTRUMENT ID
LABEL WITH THE INTENDED APPLICATION
– INTRINSICALLY SAFE OR TYPE N / NON-
INCENDIVE.
