GE Masoneilan 12420 - 5.4.2. Wiring and Connections; 5.4.3. Allowable Supply Voltages; 5.4.4. Maximum Power; 5.4.5. Output Signal and Load Resistance

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5.4.2.
WIRING 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.
5.4.3.
ALLOWABLE 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)
AO_1 AO_2 DO_1/DO_2
MIN MAX MIN MAX MIN MAX
Explosion proof
10 V
40 V
10 V
30 V
0.5 V
30 V
Intrinsic Safety
10 V 30 V 10 V 30 V 0.5 V 30 V
5.4.4.
MAXIMUM POWER
3 W into 12400 case
5.4.5.
OUTPUT 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)
Imax (A)
♦ 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.
Figure 8 – Terminal board
Standard version with clamp (Ref. #90)
Figure 9 - Terminal board
Japanese version with screws (Ref. #90A)
R
load
U
Figure 10