Omega Products LVC551 Installation Manual

APPROVED

INSTALLATION OF

Am OMEGA

One Omega Drive, Box 4047 Stamford, Connecticut 06907-0047 (203) 359-1660 Telex: 996404 Cable: OMEGA FAX: (203) 359-7700

LVC551

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INTRINSICALLY SAFE CONTROLS

This bulletin should be used by experienced personnel as a guide to the installation of the LVC551 intrinsically safe control. Selection or installation of equipment should always be accompanied by competent technical assistance. We encourage you to contact OMEGA for complete details.

IMPORTANT: BEFORE PROCEEDING

WIRE THE CONTROL, READ AND THOROUGHLY UNDERSTAND THESE INSTRUCTIONS.

When installed according to these instructions, the unit is intrinsically safe for Class I and II, Division

1, Groups A, B, C, D, E, F, and G

Electrical equipment connected to associated appartus should not use or generate more than 250V RMS.

LOCATION: The control must be situated in a non-

hazardous area where an explosive atmosphere will

not exist at any time. WIRING:

Intrinsically safe wiring must be kept separate from non-intrinsically safe wiring.

Intrinsically safe and non-intrinsically safe

wiring may occupy the same enclosure or raceway if they are at least 2 inches (50mm) apart and separately tied down. Inside panels, field wiring terminals for intrinsically safe circuits must be separated by at least 2 inches (50mm) from non-intrinsically safe terminals. Wire the control device(s) to the LVC551 relay

3. as shown in the specific application wiring diagram on reverse side. A separate rigid metallic conduit should be used to enclose the conductors of the intrinsically safe control circuit. An approved seal should be used at the point

4. where the intrinsically safe control circuit wiring enters the hazardous area.

INDUCTANCE AND CAPACITANCE: For intrin- sically safe wiring use 16 AWG TYPE MTW or 14 AWG TYPE THHN.

By using these types of wire in conjunction with the following distance recommendations, you will not exceed the 500 mh inductance for field wiring.

.45

mf maximum capacitance, and

INSTALL AND

Use the following chart to determine the limits of run:

Max. Sensitivity (K OHMS)

3.3

4.7

10 22 47

100

GROUNDING: Both tabs of the LVC551 provide an electrical connection for earth grounding. To insure grounding, use only metal screws and lockwashers. Do not use nylon or any other nonmetallic material to mount the unit in the enclosure.

NOTES:

Connecteions may be made to nonenergy

1. generating or storing hazardous location devices, such as switch contacts, noninductive resistance thermometer detectors thermocouples without necessitating a specific approval except when the device is mounted inside a tank subjected to pressure greater than

15 psi.

To prevent electrical shock, controller must be

2. mounted inside a tool accessible enclosure.

For guidance on the installation see ANSI/ISA

RP 12-6.

Distance (Ft.)

5000 3500 1750 1000

500 250

(RTD’s)

and

SPECIFICATIONS

CONTACT DESIGN: D PST: One normally open (N.O.) and one normally closed (N.C.)

CONTACT RATINGS: 8 Amperes resistive load at 250 Volts A.C. and 5 ampheres at 30 Volts D.C.

CONTACT LIFE: Electrical at rated load

50/60

10,000,000

minus

Hertz.

cycles.

50/60

15%,

seconds on rising level.

cycles. Mechanical

ELECTRONICS MODULE: Solid state components

epoxy encapsulated in nylon shell.

PRIMARY AC SUPPLY LINE:

(a) Voltage: Standard 120 VAC, optional 24,240 VAC

Watt.

lo%,

models, plus (b) Frequency: (c) Power:

SENSITIVITY: Operates from 0

maximum specific resistance.

TEMPERATURE: (Minus) -40 to (Mlus) + 120

degrees F. ambient. TERMINALS: Size 6 pan head screws with

captivated wire clamping plate. TIME DELAY: Standard,

= 100,000

Hz.

100,000 Ohm

SINGLE LEVEL SERVICE

ACTUATED

;;;nect

terminal palr 1-2 to (24, 120,240) VAC supply

LVC551

CONDUCTANCE

INTRINSICALLY SAFE CONTROLS

INSTALLATION OF

DIFFERENTIAL LEVEL SERVICE

ACTUATED:

;;;;ect

terminal pair 1-2 to

(24,120,240)

CONDUCTANCE

VAC supply

.‘-

Install sensitivity resistor between terminals RH-H and metallic jumper between termlnals H-L. Connect terminal L to the electrode.

Terminal G must be grounded to the tank If

metallic.

When the tank Is non-metallic, terminal G must be con-

nected to an additional electrode of length equal to

the longest electrode.

NOTE: Jumpers and resistors must be installed as

shown to insure proper operation.

r-----

--------pENcLosURE

/xq

Install sensltivity resistors between terminals RH-H

RL-L.

and Connect terminal H to high electrode and terminal L

low

electrode.

to Terminal G must be grounded to the tank If metallic. When the tank Is non-metallic, terminal G must be con-

nected to an additional electrode of length equal to the longest electrode.

NOTE: Jumpers and resistors must tie Installed as shown to Insure proper operation.

__--_--___-

NON-HAZAROOUS AREA

________---_- HAZARDOUS AREA

CLASS

fn$uam

NOTE: RESISTOR ’ MUST AS SHOWN TO INSURE PROPER

OPERATION

AWD 1

INSTALLED

DIVISION

c. A,

E. 0. 0.

_----

q--y-__

PILOT

SINGLE INPUT (NON-LATCHING)

CONTACT

ACTUATED:

l-2

Connect terminal pair

to (24, 120,240) VAC supply line. Install metallic jumpers between terminals RH-H and terminals H-L. Wire contacts 3-4 (normally open) and 5-6 (normally closed) into load circuits as required. Connect the pilot contact to terminals G-L. NOTE: Jumpers must be Installed as shown to insure proper operation.

-+-

DEWCC

_-__

NON-HAZARDOUS

-_-_-_-_-_-_-_-_-_

HAZARDOUS WC&W

CLISB A.

AREA

DlvlaI0M

2. A”0 1

AREA

F.I D.

1. C.

DUAL INPUT (LATCHING)

PILOT CONTACT

ACTUATED:

;;remect terminal pair 1-2 to

(24,120,240)

VAC supply

Install metallic jumpers between terminals RH-H and terminals RL-L.

5-6

Wire contacts 3-4 (normally open) and

(normally closed) into load circuits as required. Connect the latch pilot contact to terminals G-H and the unlatch pilot contact to terminals G-L. NOTE: Jumpers must be installed as

proper operation.

NON-HAZARDOUS AREA

______-_-_-_-_-_-- HAZARDOUS AREA

CLASS

EJW

DWISION 1,

1 AU0 1

D. do 6.

F.I

I II

shown to

I II

1 !46

insure~V

INC.

manner, either wholly or in part for any purpose whatsoever without written permission from OMEGA ENGINEERING, INC.

M1224/1290

manual+may

be reproduced in any