Yokogawa MLD Operating Manual

IM 61A01A01-01E-A

4th Edition

Model MLD Loop Powered Process Indicator

User’s Manual

IM 61A01A01-01E-A

Model

Suffix Codes

Description

MLD Field Mounted Loop Indicator (Digital)

Input Signal

-A 4 to 20 mA DC

Mounting

1 2

2” Horizontal Pipe 2” Vertical Pipe (or wall mount)

Housing

/1 /2

Cast Aluminum Alloy - (Standard Housing) SUS316 Cast Stainless Steel and ASTM CF-8M

Electrical Connection

/00 /20

/30 /40

ANSI ½ NPT female, without blind plug ANSI ½ NPT female, 316 Stainless Steel blind plug ISO M20 female, without blind plug ISO M20 female, 316 Stainless Steel blind plug

Ex Protection

/FF1 /CF1

FM Explosion Proof CSA Explosion Proof

Optional Specifications

Coating

/X1 /X2

Epoxy resin coating Polyurethane-Epoxy Anti-corrosion coating

Paint

/P1 /P2 /P3 /P4 /P5 /P6

/P7

Light Blue (RAL # 5012)

Orange (RAL # 2008) Red (Munsell # 7.5 R4/14) Mint Green Silver (RAL # 9006) Yellow (RAL # 1018) Gray (RAL # 7046)

Calibration

/ENG

Engineering Unit Calibration (MLD Only)

Stainless Steel Tag

/SST

Stainless Steel tag screw attached to housing

Stainless Steel Tag

/SSW

Stainless Steel tag wired to housing

1. PREFACE

The Model MLD field mounted indicator receives a DC current signal from electronic transmitters and indicates process measurement values. This instruction manual gives instructions on handling, mounting, and wiring of the MLD indicator.

2. MODEL CODE AND SPECIFICATIONS

STANDARD SPECIFICATIONS

Voltage Drop:

1.8V typ., 2V max.

Scale: 0- 1999 w/decimal

Accuracy:

± 0.05% of full scale (1999) ±1 count

Operating Temperature Range:

-20 to 60°C

Temperature drift: ±0.3 Count/°C

Insulation

terminals and case 100 Mohm at 500 V DC

Dielectric

and case: 1000 VAC for 1 minute.

Mounting:

surface.

Explosion Protection Type:

EXPLOSIONPROOF A,B,C,D, GROUPS E,F,G

Case and Cover: Die cast aluminum or 316 Stainless Steel, baked polyurethane paint. Moss Green (Stainless Steel is unpainted); NEMA 4X

Electrical

M20 x 1.5

Weight: 2.7 lbs

ORDERING INSTRUCTIONS

Example Ordering Instructions:

MLD-A1/1/00/FF1/ENG/SST Field Mounted Indicator (Digital), 4 to 20 mA DC, 2” Horizontal Pipe, FM Explosion Proof 0-200 InH2O Scale in Engineering Units. Please specify Scale and Engineering units when ordering /ENG FT-201 Specify Tag Number when ordering /SST or /SSW

Resistance: Between input

Strength: Between input terminals

Nominal 2” (50mm) pipe mount or

FM, CSA,

CL1, DIV1, GROUPS

DUST-IGNITIONPROOF

Connection: ½ x 14 NPT or

1. Model and Suffix codes.

2. Option Codes

CLII / III,

IM 61A01A01-01E-A

DIMENSIONS

3. INSTALLATION

The Loop Powered Indicator can be mounted on a wall or a 2” pipe. The housing is a NEMA 4X Explosion Proof housing so it c an be mounted outside in the field.

Do not install the unit in the following conditions:

• Extreme Temperatures beyond the temperature rating of the instrument.

• High vibration areas above the vibration rating of the instrument.

• Extremely corrosive environments.

MOUNTING EXAMPLES