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4.1 Special conditions for use in Zone 0
The measurement of temperatures with the Ex-Pt 720 within
Zone 0 is only permitted if the following conditions are complied with:
- A stainless-steel sensor Type 0628 2232 or 0628 2432 is used.
- The sensors are to be grounded via the ground wire. When doing this
make sure there is a secure ground connection. The grounding terminal
is to be attached in such a way that it cannot be detached accidentally.
The ground connection must be established outside Zone 0 and before
taking the sensor into Zone 0. For more information with regard to appro-
priate grounding, please refer to, e.g. BG regulation BGR 132
(BG = Employer's Liability Insurance Association).
- The Ex-Pt 720 itself may not be taken into Zone 0.
- It must be absolutely ensured that the unit does not find its way
accidentally into Zone 0. In order to guarantee this, the carrying
strap of the unit must be attached additionally to the belt of the user
or to a loop attached to his belt. The length of the carrying strap
must be so adjusted that when the unit hangs freely on the carrying
strap, the Ex-Pt 720 maintains a spacing of 50cm to the bboundary
area of Zone 0.
- Should the unit be used in the optionally available leather case, the
carrying strap of the unit must still comply with the conditions for
attachment to the user's body.
5. Ex-Data
EC-test approval-no.:
Ex-designation:
Approved for Zone 1, equipment group II, gas group IIC explosions-endan-
gered gases, vapours or fog, temperature class T4.
Only the sensors specified in the approval certificate may be used. Sensor
no. 0628 2232 and 0628 2432 may be used in Zone 0 !
Report Job Identification No:
FM Marking:
Intrinsically safe for Class I, Division 1, Groups A, B, C, and D hazardous
(classified) locations temperature class T4 at a 50°C ambient and intrinsically
18
TÜV 01 ATEX 1757 X
II 2(1) G Ex ia IIC T4
3015067
I.S. Class I Div.1 A - D T4
Class I Zone 0 AEx ia IIC T4
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