Yokogawa MLD - Manual (Page 2)

IM 61A01A01-01E-A
Model Suffix Codes Description
MLA
MLD ……………….
………………. Field Mounted Loop Indicator (Analog)
Field Mounted Loop Indicator (Digital)
Input Signal
-A …………..
-B …………..
-C ………….. 4 to 20 mA DC
10 to 50 mA DC (MLA only)
1 to 5 VDC (MLA only)
Mounting
1..............
2 ……….. 2” Horizontal Pipe
2” Vertical Pipe (or wall mount)
Optional Specifications
Ex Protection
/FF1
/CF1 FM Explosion Proof
CSA Explosion Proof
Calibration /ENG Engineering Unit Calibration (MLD Only)
Face plate /WHT White scale or face plate (MLA Only)
Scale /SC
Scale in Engineering units (MLA Only)
Stain Steel Tag
/SST
/SSW Stainless Steel tag screw attached to housing
Stainless Steel tag wired to housing
Electrical
Connection
/0
/1
/2
/3
/4 ANSI ½ NPT female, without blind plugs
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
Temperature /T1 Low-Temperature (-50°C, MLA only with Option CF1)
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)
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 SPECIFICATIONS
STANDARD SPECIFICATIONS MODEL MLA & MLD
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 drift: ±0.3 Count/°C (MLD)
Insulation Resistance: Between input
terminals and case 100 Mohm at 500 V DC
Dielectric Strength: Between input terminals
and case: 1000 VAC for 1 minute.
Mounting: Nominal 2” (50mm) pipe mount or
surface.
Explosion Protection Type: FM, CSA,
EXPLOSIONPROOF CL1, DIV1, GROUPS
A,B,C,D, DUST-IGNITIONPROOF CLII / III,
GROUPS E,F,G
Case and Cover: Die cast aluminum, baked
polyurethane paint. Moss Green; NEMA 4X
Electrical Connection: ½ x 14 NPT or
M20 x 1.5
Weight: 3.0 lbs (MLA), 2.7 lbs (MLD)