Yokogawa MLD User Manual

IM 61A01A01-01E-A

2nd Edition

Model MLD (Digital

Model MLA (Analog)

Model MLA & MLD

User’s Manual

Loop Powered Process Indicators

IM 61A01A01-01E-A

)

IM 61A01A01-01E-A

Model

Suffix

Codes

Description

……………….

-A …………..

-C …………..

4 to 20 mA DC

1 to 5 VDC (MLA only)

2 ………..

2” Vertical Pipe (or wall mount)

/CF1

CSA Explosion Proof

Scale

Scale in Engineering units (MLA Only)

/SST /SSW

Stainless Steel tag screw att ac hed to housing Stainless Steel tag wired to housing

ANSI ½ NPT female, without blind plugs

Temperature

/T1

Low-Temperature (-50°C, MLA only with Option CF1)

1. PREFACE

The Model MLA and MLD field mounted indicators receive DC voltage or current signals from electronic transmitters and indicate process measurement values. This instruction manual gives instructions on handling, mounting, and wiring of the MLA (analog type) and MLD (digital type) indicators.

2. MODEL CODE AND SPECIFI CATIONS

STANDARD

Input Resistance: < 6.5 ohm (MLA-A 4-20mA),

< 13.5 ohm (MLA-B 10-50mA), ~4K ohm (MLA-C 1-5V)

Voltage Drop: 1.8V typ., 2V max. (MLD) Scale: Black. Analog single graduations 0-

100% standard. Digital 0-100.0% w/decimal standard.

Accuracy: ± 1.5% of full scale (MLA)

± 2.0% of full scale (MLA with /T1 Option) ± 0.05% of full scale (1999) ±1 count (MLD)

Operating Temperature Range:

-50 to 60°C (MLA with Options /CF1 and /T1)

-20 to 60°C (MLA/MLD with all other Options)

Temperature 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, baked polyurethane paint. Moss Green; NEMA 4X

Electrical

M20 x 1.5

Weight: 3.0 lbs (MLA), 2.7 lbs (MLD)

drift: ±0.3 Count/°C (MLD)

Resistance: Between input

Strength: Between input terminals

Nominal 2” (50mm) pipe mount or

DUST-IGNITIONPROOF

Connection: ½ x 14 NPT or

SPECIFICATIONS

: FM, CSA,

CL1, DIV1, GROUPS

CLII / III,

MODEL MLA &

MLA MLD

Input Signal

Mounting

Ex Protection Calibration /ENG Engineering Unit Calibration (MLD Only)

Face plate

Stain Steel Tag

Electrical Connection

Coating

Paint

MLD

……………….

-B …………..

1..............

/FF1

/WHT /SC

/1 /2 /3 /4

Field Mounted Loop Indicator (Analog) Field Mounted Loop Indicator (Digital)

10 to 50 mA DC (MLA only)

2” Horizontal Pipe

Optional Specifications

FM Explosion Proof

White scale or face plate (MLA Only)

ANSI ½ NPT female, 304 Stainless Steel blind plugs ANSI ½ NPT female, 316 Stainless Steel blind plugs ISO M20 female, without blind plugs ISO M20 female, 316 Stainless Steel blind plugs

/X1

Epoxy resin coating Polyurethane-Epoxy Anti-corrosion coating

/X2

/P1

Light Blue (RAL # 5012) Orange (RAL # 2008)

/P2 /P3

Red (Munsell # 7.5 R4/14) Mint Green

/P4 /P5

Silver (RAL # 9006) Yellow (RAL # 1018)

/P6 /P7

Gray (RAL # 7046)

IM 61A01A01-01E-A

OPTIONS Scale: MLA: Special range scale in Engineering Units (/SC).

Scale or Faceplate color: White on request (/WHT) Scaling: Digital: Special calibration in Engineering Units (/ENG). Max. value = 1999

Other Optional Items: Stainless Steel Tag (attached or wired to housing), Electrical Connections,

SUS316 Housing, /X1 or /X2 coatings and Paint.

ORDERING INSTRUCTIONS

1. Model and Suffix codes.

2. Option Codes

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; Up to 12 Characters.

DIMENSIONS

+ 7 hidden pages