Yokogawa RAMC User Manual
Page 113
<10. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
10-21
IM 01R01B02-00E-E 10th edition January 01, 2013 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
10.8 Intrinsically safe NEPSI (China) certified RAMC (/NS1)
The RAMC with electronic transmitter (-E, -H) with or without limit switches is certified as intrinsic safe unit with
NEPSI approval.
Certificate Nr.
: GYJ101551
Type of protection
: Intrinsically safe Ex ia
Group
:
IIC
Temperature Class
: T6
Ambient temperature
: -25°C ... +70 °C
Safety relevant maximum values of electronic transmitter :
Maximum voltage
: U
i
= 30 V
Maximum current
: I
i
= 101 mA
Maximum power
: P
i
= 1.4 W
Inner inductance
: L
i
= 150 µH
Inner capacity
: C
i
= 4.16 nF
Data of limit switches option /K1 to /K10 :
The following table shows the maximum safety parameters for intrinsic safe limit switches according the certificate
NEPSI GYJ03201X :
Standard /K1 ... /K3
Ex ia IIC T6
Fail Safe /K6 .../K10
Ex ia IIC T6
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
max. ambient temp. [°C] for T6
49
28
49
28
max. ambient temp. [°C] for T5
61
40
61
40
max. ambient temp. [°C] for T4 - T1
89
68
89
68