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Revision1.2ROMIII“‐L”&“‐LIQ”Installation&OperationManualPageNo.6of15
Construction - The monitor is housed in a rectangular aluminum box enclosure with six ½
NPT threaded entries and a windowed cover held in place by six bolts. There are two circuit
boards (Base board and Top board), the boards are encapsulated with only the wiring
terminals and signal LEDs protruding from the encapsulation. The input terminals are
separated from the intrinsically safe terminals by a metal partition. There on certain
installations, there may be also a small encapsulated Model #1910A 2-Wire Terminator.
This “terminator”,
is used to terminate the unused sensor input circuits. It is typically installed
vertically inside the ROM III enclosure at the lower left corner.
circuit board the 1910 Terminator. The 1910 is mounted inside the ROM III enclosure and is
used terminate the end of a string of output circuits. The Model #1910A 2-Wire
Terminator is typically installed vertically inside the ROM III enclosure at the lower left
corner
Ratings - The ROM III operating voltage is 9 – 30 Vdc, 1A. The ROM III is rated for use in an
ambient temperature range of -40°C to +70°C.
Entity Parameters: TB2
Uo (Voc ) = 11.8V, Io (Isc ) = 36.2mA, Po = 110mW, Co (Ca ) = 400nF, Lo (La ) = 3.8mH
Vt = 11.8 V, It = 185 mA, Po = 0.546W, Co (Ca ) = 400nF, Lo (La ) = 3.8mH
Entity Parameters: TB3 (only one type connection can be used at one time)
Float Connections: Ui (VMAX) = 20V, Ii (IMAX) = 450mA, Pi = 1.0W, Ci = 0uF, Li = 0mH
Therm Connections: Ui (VMAX) = 20V, Ii (IMAX) = 250mA, Pi = 1.0W, Ci = 0uF, Li = 0mH
Optic Connections: Ui (VMAX) = 20V, Ii (IMAX) = 250mA, Pi = 1.0W, Ci = 0uF, Li = 0mH
Entity Parameters: TB4
AUX 1, 2, 3: Uo (Voc ) = 30 V, Io (Isc ) = 2.5mA, Po = 19 mW, Co (Ca ) = 400nF, Lo (La ) = 1.9H
AUX 1, 2, 3: Vt = 30 V, It = 7.5 mA, Po = 0.546W, Ca = 400nF, La = 1.9H
AUX OUT: VMAX = 20 V, IMAX = 50mA, Ci = 0nF, Li = 0mH
Specific Conditions of Use:
The enclosure is a potential electrostatic hazard. To prevent the risk of electrostatic sparking,
the surface should only be cleaned with a damp cloth.
4. Top Only ROM III Onboard Monitor
The ROM III monitor can be configured for top only (overfill) operation. A terminal block
connection is provided to disable the retain (bottom) circuitry. Top only ROM III configuration
will provide the advantages of 2 wire sensors and advanced diagnostics with the ability to
install retain sensors at a later date. This terminal block is located at the top of the unit, and
is labeled TB4A. A jumper wire is installed between the terminals to DISABLE the retain
(bottom) circuitry. It is pre-wired at the factory if the proper system is ordered. DO NOT
connect anything to the retain (bottom) sensor terminals.
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