YOKOGAWA ZR202S, User Manual, Page: 5 / 163

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IM 11M13A01-04E
<Introduction>
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Precautions in Handling Explosion-proof Zirconia Oxygen Analyzer
The explosion-proof zirconia oxygen analyzer (Model ZR202S) are designed as explosion-proof
instruments.
When using either of these instruments in an explosion-susceptible hazardous area, note the
following and observe the given precautions:
Use only the supplied, the explosion-proof zirconia oxygen analyzer (Model ZR202S) and
accessories, or any explosion-proof certification may be invalidated.
For the details, refer to the system configurations in the manual.
CAUTION
Only trained persons use this instrument in industrial locations.
Explosion-proof Approval followings:
ZR202S-A (ATEX); Ex db IIB+H
2
T2 Gb, Ex tb IIIC T300°C Db
ZR202S-B (FM); Class I, Division 1, Groups B, C and D, Class II/III, Division 1,
Groups E, F and G, T2
ZR202S-C (CSA); Class I, Division 1, Groups B, C and D, Class II/III, Division 1,
Groups E, F and G, T2
ZR202S-D (IECEx); Ex db IIB+H
2
T2 Gb, Ex tb IIIC T300°C Db
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For the safe use of this equipment
WARNING
EXAxt ZR is very heavy. Be sure not to accidentally drop it. Handle safely to avoid injury.
Connect the power supply cord only after confirming that the supply voltage matches the rating of this
equipment. In addition, confirm that the power is switched off when connecting power supply.
Some process gas is dangerous to people. When removing this equipment from the process line for
maintenance or other reasons, protect yourself from potential poisoning by using a protective mask or
ventilating the area well
CAUTION
Requirements for explosion-proof use:
The ambient temperature is in the range of -20 to +55ºC. The surface temperature of the ZR202S is
not over the temperature class T2 (300ºC)*
* The surface temperature of the amplifier box does not exceed 70ºC.
Oxygen concentration of sample/reference /calibration gas shall not exceed that found in normal air,
typically 21 vol%.