Wiring And Connections; Allowable Supply Voltages; Maximum Power; Output Signal And Load Resistance - GE Masoneilan 12420 Instruction Manual & Safety Manual

Figure 8 – Terminal board
Standard version with clamp (Ref. #90)
W
5.4.2.
IRING AND CONNECTIONS
All wiring and connections must be done in accordance with EN/IEC 60079-14, EN/IEC 61241-14 and/or local and national codes
for hazardous area installations.
A
5.4.3.
LLOWABLE SUPPLY VOLTAGES
Electrical connections on terminal board must respect polarity + and –, as well as maximum allowable supply voltages given
below. Connect the instrument to the ground using the ground terminals internally and externally to the case.
Supply Voltage
U (VDC)
Explosion proof
Intrinsic Safety
M
5.4.4.
AXIMUM POWER
3 W into 12400 case
O
5.4.5.
UTPUT SIGNAL AND LOAD RESISTANCE
♦ AO_1 and AO_2
Response (scan) time: <60ms
Power interruption without causing reset: <100ms
Power-Up time: < 1s
Compliance with NAMUR NE-43 specification
standard level measurement: 3.8mA to 20.5mA

Low or high failsafe signals (severe fault): < 3.6mA or > 21mA

♦ Maximum load resistance
For AO_1 and AO_2: R max (Ω) = U (V) – 10 (V)
♦ DO_1 and DO_2
There are two independent isolated output switches with open collectors. 1A maximum output signal. A load resistance must
be used in series to limit maximum current. 30 VDC across switch terminals and 1 A cannot exist simultaneously; doing so will
result in failure of the digital output circuit.
16 | GE Oil & Gas
AO_1
MIN MAX
10 V 40 V
10 V 30 V
Imax (A)
Figure 9 - Terminal board
Japanese version with screws (Ref. #90A)
AO_2 DO_1/DO_2
MIN MAX MIN
10 V 30 V 0.5 V
10 V 30 V 0.5 V
R
load
U
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MAX
30 V
30 V
Figure 10