Baker Hughes Masoneilan 12400 Series, Instruction Manual, Page: 8 / 17

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Cable temperature: must be mentioned if the ambient temperature is greater than 70°C:
Ambient Temperature Cable Temperature
75 °C 80 °C
80 °C 85 °C
6. ELECTRICAL CONNECTIONS and CONDUIT ENTRY
The type 12400 must be installed and put into service in conformance with EN/IEC 60079-14 and / or
national and local regulations applicable for explosive atmospheres.
6.1. Voltage supply allowable
Connect the wires to the instrument's terminals, taking care of complying with pola and -
and maximum voltage allowed mentioned in the table below. Make the earth connections with
the internal and external ground terminals.
Voltage Supply U (V)
AO_1 AO_2 DO_1/DO_2
MINI MAXI MINI MAXI MINI MAXI
Flameproof 10V 40V 10V 30 V 0.5V 30V
Intrinsic Safety 10V 30V 10V 30V 0.5V 30V
6.2. Maximum Power
3 W inside the 12400 housing.
6.3. Output current and loop resistor
o
AO_1 et AO_2:
3.8mA to 20.5mA for measurement
< 3.6mA or > 21mA in case of fault
o Maximum loop resistor
For AO_1 et AO_2 : R maxi (

) = U (V)
– 10 (V)
I max (A)
R charge
U
o
DO_1 et DO_2
Open collector output. Maximum current is 1A. A load resistor must be inserted in the loop
to limit the current to this maximum.
6.4. Intrinsic Safety entity parameters
AO_1: terminal identification: Primary OUT 4- 20 mA
Max. Input Voltage Ui 30 V
Max. Input Current Ii 125 mA
Max. Input Power Pi 900 mW
Max. Internal Capacitance Ci 2.0 nF
Max. Internal Inductivity
Li
500 µH