<7. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
7-10
IM 01R01B30-00E-E 8th edition November 01, 2019-00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
7.3 Intrinsically safe ATEX RAKD for use in zone 2 (/KS3)
The RAKD with /KS3 is a unit with protection "ic".
It
may be used in hazardous areas of zone 2 (category 3G).
This version is same hardware as intrinsically safe "ia" type (/KS1).
Type of protection:
Intrinsically safe Ex ic IIC T6...T4 Gb
Data of electronic transmitter:
Ambient temperature:
-25 °C to +65 °C
Safety relevant maximum values:
Supply (current output):
Maximum voltage:
U
i
= 30 V
Maximum current:
I
i
= 100 mA
Maximum power:
P
i
= 750 mW
Inner inductance:
L
i
= 0.73 mH
Inner capacity:
C
i
= 2.4 nF
Pulse output:
Maximum voltage:
U
i
= 16 V
Maximum current:
I
i
= 20 mA
Maximum power:
P
i
= 64 mW
Inner inductance:
L
i
= 0 mH
Inner capacity:
C
i
= 0 nF
Fig. 7-7
Protection circuit for a power supply to meet the maximum values
Data of limit switches:
Safety relevant maximum values:
Table 7-3
Standard /K1 to /K3
Fail-safe /K6 to /K8
Type 2
Type 3
Type 2
Type 3
Ui [V]
16
16
16
16
Ii [mA]
25
52
25
52
Pi [mW]
64
169
64
169
Ci [nF]
150
150
30
30
Li [µH]
150
150
100
100
current limitation
R1
S1 = 200 mA F
+
Po = 0.7 W
to
I o = 100 mA
D 1 = 27 V 5 % 24V DC
U o = 28.35 V
“ic”
voltage
C o= 260 nF
limitation
L o = 8.0 mH
-
R 1= 300 Ω, 5 %, 3 W
RAKD
