• The sensors are suitable for installation without barriers in Class I Div. 2 Groups A, B, C, D; Class II Div. 2 Group G; and Class III

Div. 2, when installed in (or through the wall of) a suitable enclosure with provision for connection of rigid metal conduit per

the National Electrical Code, as acceptable to the local inspection authority having jurisdiction. In Div. 2 installations (without

barriers), observe Explosion Hazard warning at the beginning of this section.

• The sensors are suitable for installation without barriers in Class I Div. 2 Groups A, B, C, D when installed in (or through the wall

of) a suitable enclosure with provision for connection of rigid metal conduit per the Canadian Electrical Code, as acceptable to

the local inspection authority having jurisdiction. In Div. 2 installations (without barriers), observe Explosion Hazard warning at

the beginning of this section.

• Maximum non-hazardous area voltage that the Intrinsically safe barrier is connected to must not exceed 250 V.

• Control (Installation) Drawing p/n 35392 has been replaced by this document.

Wiring Connections

The SMI30 Series sensor is intrinsically safe ONLY when used with certified energy-limiting intrinsically safe barriers. Banner does not

manufacture such barriers; however, our applications engineers can refer you to suppliers of certified barriers that will interface with

Banner sensors. SMI30 Series sensors may be wired using Banner Current Amplifier Control Module CI3RC2. Note from the wiring

diagrams that the installation may be made with either a single barrier (2-wire hookup) or with a double barrier (3-wire hookup).

Emitter-only units (SMI30EQD, ESRQD, and EFQD) use the 2-wire hookup; all other models use either 2- or 3-wire hookup.

In the 2-wire configuration, the sensor will act as a current sink, drawing less than 10 mA in the OFF state and more than 20 mA in the

ON state. The user must provide a current sensing device (“current sensor” in the diagram) to convert the current to a logic level. In the

3-wire configuration, the output may be used directly to control loads of less than 15 mA.

In selecting the barrier, it is important to consider the barrier's resistance. The sensor must have at least 10 volts across the brown and

blue power leads for proper operation, and the barrier will cause a voltage drop due to its resistance. The formula that determines how

much resistance is allowed is: R = 40 (supply voltage – 10 volts).

If the supply voltage is 24 V dc, then the maximum resistance is 560 ohms. If the supply voltage is 18 V dc, then the maximum resistance

is 320 ohms. This includes the resistance of any current sensing device used (in the 2-wire configuration), so the barrier resistance must

be further reduced by the current sensor resistance.

Note that, in the 3-wire hookup, the positive load barrier is in series with the load. This will result in an apparent saturation voltage of

the output that is higher than the sensor output by the amount of I × R (current times resistance) drop through the barrier.

A “positive input” barrier is required for both supply and for load. The sensor’s blue (negative supply) lead is normally connected to the

ground terminal of the barrier.

The user is responsible for proper installation and maintenance of this equipment, and must conform with the certification

requirements relating to barriers and to maximum allowable capacitance and inductance of the field wiring. If in doubt about these

requirements, our applications engineers can refer you to the appropriate authority.

OUT

IN

OUT

BROWN

BLACK

INPUT

+

-

3

+

I.S.

+

-

+

+

Operating Voltage

18–30 V dc

25 mA dc

Barriers not required for Div. 2

30 V dc max. (See General Notes and Conditions

for Safe Use)

1

3

2

Safe area

Hazardous area

15 mA

max.

L

O

A

D

IN

V

SMI30 Series Sensor bottom view

(colors shown are for mating

cordset MBCC-312)

Blue

Busbar

G

Earth ground

(less than 1 ohm)

Note: Emitters have no output connection (no connection to black wire)

Black

Brown

IN

Figure 1. Wiring for 3-Wire Connections

SMI30 Series Sensor

P/N 35331 Rev. H

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