Omega SBG25872, SBG41705, SBG25873, SBG22445 User Manual

SBG22445, SBG25872, SBG25873 (Non-Latching), SBG41705 (Latching) Solid-State Relays for Intrinsic Safety Use

Instruction Sheet M1773/0794

DESCRIPTION

The OMEGA State Relays are used as "intrinsically safe switching circuits in hazardous locations, with non-voltage- producing sensors. When installed in accordance with this manual, these field sensors are suitable for Class I, Division 1, 2, Groups A, B, C and D, and Class II, Division 2, Groups E, F and G as defined by Article 500 of the National Electric Code.

UNPACKING

Remove the Packing List and verify that you have received all equipment. If you have any questions about the shipment, please call the OMEGA Customer Service Department at 1-800-622-2378 or (203) 359-1660. When you receive the shipment, inspect the container and equipment for any signs of damage. Note any evidence of rough handling in transit. Immediately report any damage to the shipping agent.

NOTE

The carrier will not honor any claims unless all shipping material is saved for their examination. After examining and removing contents, save packaging material and carton in the event reshipment is necessary.

ASSOCIATED EQUIPMENT Caution: The intrinsically safe relays can be installed in panel assem-

blies in Class I, Div.2, Groups A, B, C and D or in a non-hazardous location. Only the sensor's terminals provide an intrinsically safe switch circuit (Fig. 1, 2). (Exia) means associated equipment "Appareilage connexe", located in safe area.

MOUNTING AND ENCLOSURE CONSIDERATION

• Field wiring of intrinsically safe circuits is to be segregated from

non-intrinsically safe wiring by use of suitable barriers, separate wireways or trays (see Fig. 3).

• Intrinsically safe and non-intrinsically safe connection points should

be located sufficiently apart to prevent any possibility of bypassing or miswiring during installation or servicing of equipment.

• The enclosure shall contain a cautionary statement as follows:

"CAUTION: ANY SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC SAFETY".

• The mounting plate must be grounded to ensure intrinsic safety.

Resistance between the plate and earth ground should be less than one ohm. (See Figs. 4 and 5 for recommended selection of grounding hardware and refer to Article 250 of the National Electrical Code for methods and practice.)

INSTALLATION OF SENSOR SWITCH AND ASSOCIATED FIELD WIRING

• The nature of the sensor switch must be that it is a non-voltage-

producing, essentially resistive termination or other device specifically examined and approved for use with the intrinsically safe solid-state relay.

• The conductors of the intrinsically safe circuit should be sealed in a

rigid metal conduit at the point where the wiring enters the hazardous area. The wiring and sensor switch should be such that conductive dusts in the hazardous area will not close the circuit.

• Hazardous area field wiring will store energy due to distributed

capacitance and inductance in proportion to its length. It is therefore recommended that the characteristics of the cable be known and judged against the length of run and atmosphere of exposure. The following chart is presented as a guideline in determining the limits of reactance for signal loops in the hazardous area wiring for the intrinsically safe solid-state relays.

SBG22445, SBG25872, SBG25873 and SBG41705 Solid-

Important: Read carefully and completely before installing or connecting the solid-state relays.

WARNING

3 mH 10mH 20mH

GROUP

A & B

C D

CAPACITANCE

0.1 µF

0.2 µF

0.3 µF

Product must be maintained and installed in strict accordance with the National Electrical Code. Failure to observe this warning could result in serious injuries or damages.

INDUCTANCE

Fuse F1

Input

VAC

Fuse

Sensor Switch

Note: For 120V application, only one fuse is required in the ungrounded circuit of the input line.

Load

(EXIA)

Non-Hazardous Location

Hazardous Location

Fig. 1. Connection Diagram

(All Models Except SBG41705)

VAC

Sensor Switch

Load

Latching Solid-State

Relay SBG41705

Off

LOAD

Non-Hazardous Location

Hazardous Location

Fig. 2. Connection Diagram: Model SBG41705

Earth

Ground

(2 Places)

Common

Earth-

Grounded

Mounting

Plate

Intrinsically Safe Wiring To Sensors

Note: All intrinsically safe wiring must be segregated from non-intrinsically safe wiring.

Resistance to ground must be from bracket to earthing member to insure integrity of system. (Must be below one ohm.)

Non-Intrinsically

Safe Wiring

Multiple

Units

Fig. 3. Multiple units grouped on a common, earth-grounded mounting plate.

Intrinsically Safe

Solid-State Relays

Example: Typical values of capacitance for a twisted pair of copper wires is between 20 and 60 pF per foot. Using the maximum value of 60pF/ft, Groups A & B could have a run of 1500+ feet with safety. Inductance of a typical twisted pair is between 0.10 and 0.20 µH/ ft, thus making a cable run in this example essentially determined by the capacitance.

• Whenever possible, the actual measured parameters should be

used in making the determination of allowable length.

• Shielded cable is not required, but if used in the application, the

shield must be returned to ground, the same point at mounting tab.

#10 Screw

#10 Lockwasher*

Mounting

Plate

*(Lockwashers to be internal or external tooth type)

#10 Lockwasher*

#10 Nut

Fig. 4. Unit Mounting Detail

• Non-intrinsically safe wiring cannot be run in conduit or open

raceways together with intrinsically safe wiring.**

• Refer to Fig 6 for detailed connection to terminal studs. All

hardware, including terminal lugs, is supplied with unit.

• Fusing of the solid-state relays to be in accordance with

Fig. 1. Fuse F1 to be 6 amps slo-blo, 120 VAC for 120V line voltage; 250 VAC for 240 V application.

Note: All intrinsically safe wiring to intrinsically safe solid-state

relays must be segregated from non-intrinsically safe wiring.

Stud Cover

Terminals

Nylon

Stud Nuts

Stud

Cover

Terminals

Nylon

Stud Nuts

Mounting

Plate

Lockwasher*

Nut

Lockwasher*

Screw

Lockwasher*

Nut

Terminal Lug

Notes:

1. *(Lockwasher to be internal or external tooth type)

2. Grounding hardwre to be #8 or larger and S.S.

Fig. 5. Mounting Plate Grounding Detail

HEX Nut

Anti-Vibrational

Lockwasher

(Tighten assembly to between 3 and 5 in-lbs.)

Terminal Lug

(Closed Ring Type)

Terminal Stud

Fig. 6 Recommended method of connection to electrical terminals. All terminal hardware, including lug, supplied with unit.

Latching

Solid-State Relay

Non-Latching

Solid-State Relay

Fig. 7. Mounting of protective cover over sensor-connected terminals of unit.

7/32" Dia. (5.5 mm)

2-5/8"

(66.6 mm)

Mounting

Tab

(76 mm)

1-5/8"

(41.3mm)

2-1/4"

(55mm)

3-1/8"

(79mm)

13/16"

(20.7mm)

Fig. 8.

Dimensions

Table 1. Specifications

Model

Number

SBG22445 SBG25872

SBG25873

SBG41705

Description

SSR for Intrinsic

Safety

Latching SSR

for Intrinsic

Safety

Line & Load

Voltage

Range

95 to

135 VAC

200 to

250 VAC

105 to

125 VAC

All AC voltage and current specifications are RMS values unless otherwise stated. Housing material is Polysulfone.

Load

Current

Max

0.3 A

Steady

State

Turn-On

Sensitivity

(Typical)

< 400 KΩ

< 25 KΩ

Turn-Off

Sensitivity

(Typical)

1 meg.

Ω

1 meg. Ω

Voltage

Loss

2 VAC

Operating

Temperature

Range

0° to +120°F

+32° to +120°F

Output

Leakage

Current Max.

6mA @

120 VAC 12 mA @

250 VAC

3 mA @

120 VAC

Switching Operation

SPST N.O. SPST N.C.

SPST N.O.

Weight

425g

P/N 158350