Yokogawa RAKD User Manual
Page 49
<8. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
8-3
IM 01R01B30-00E-E 5th edition January 01, 2013 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
Intrinsic safe power supply for the electronic transmitter :
The power supply for the electronic transmitter is an associated apparatus that may not be installed in the haz-
ardous area, and it may not exceed the safety relevant maximum values for voltage, current and power of the
electronic transmitters as specified above.
For example the type RN221N-B1 (option (U__) according certificate PTB 00 ATEX 2018 can be used.
Intrinsic safe power supply for the limit switches :
The power supply (transmitter relay) for the limit switches is an associated apparatus that may not be installed in
the hazardous area, and it may not exceed the safety relevant maximum values for voltage, current and power of
the connected limit switch as specified above.
For example the type KFA6-SR2-Ex... (option (W2_) according certificate PTB 00 ATEX 2081 (230V AC supply)
or the type KFD2-SR2-Ex... (option (W4_) according certificate PTB 00 ATEX 2080 (24V DC supply) can be
used.
Temperature specification:
Table 8-1
Configura-
tion
Max.
ambient
temperature
Max.
process tem-
perature
Temperature
class
Transmitter
4-20mA /
Pulse
65°C
65°C
T6
50°C
80°C
45°C
100°C
T5
38°C
135°C
T4
Limit
switch(es)
type 2
65°C
65°C
T6
80°C
80°C
T5
59°C
100°C
100°C
100°C
T4
73°C
135°C
Limit
switch(es)
type 3
24°C
65°C
T6
37°C
80°C
T5
34°C
100°C
57°C
80°C
T4
54°C
100°C
48°C
135°C
For the configuration where a transmitter is combined with limit switches, the temperature class is determined by
the most restrictive combinations of maximum ambient temperature and maximum process temperature.
Description of limit switch type 2 and 3 see ATEX certificates from Pepperl & Fuchs:
- PTB 99 ATEX 2219X ( SC2-NO) for /K1 to /K3
- PTB 00 ATEX 2049X (SJ2-S.N) for /K6 to /K10