Yokogawa MLA Specifications

Tag number.

General
Spe cifications

Model MLA & MLD
Loop Powered Process Indicators

The Model MLA and MLD field
mounted indicators receive
DC voltage or current signals by
electronic Transmitters and indicate
process measurement values.
Standard models are NEMA4X and
Explosion Proof.

STANDARD SPECIFICATIONS
MODEL MLA & MLD

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

< 13.5 ohm (MLA 10-50mA),
~4K ohm (MLA 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)
± 0.05% of full scale (1999) +1 digit (MLD)

Operating Temperature Range: -20 to 60°C
Temperature drift: ±0.3digit/°C (MLD)
Vibration: 1G @ 10-150Hz (MLA),

3G @ 10-150Hz (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.
Electrical Classification: NEMA4X, FM,
CSA, EXPLOSIONPROOF CL1, DIV1, GPS
A,B,C,D, DUST-IGNITIONPROOF CLII / III,
GPS E,F,G
Case and Cover: Die cast aluminum, baked
polyurethane paint. Dark green; NEMA 4X;
Optional SUS316 Stainless Steel

Electrical Connection:  NPT or M20
Weight: 3.0 lbs (MLA), 2.7 lbs (MLD)

(Weight is for standard Housing)

OPTIONS

Scale: Analog: Special range scale in

Engineering Units (/SC)
Digital: Laser faceplate available on request.
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, Electrical
Connections, SUS316 Housing, and /X1 or /X2 Paint.
/SST (limited to 12 Characters) or /SSW Tag

Model Suffix Codes Description

MLA ………………. Field Mounted Loop Indicator (Analog)
MLD ………………. Field Mounted Loop Indicator (Digital)
Input Signal -A ………….. 4 to 20 mA DC

-B ………….. 10 to 50 mA DC (MLA only)

-C ………….. 1 to 5 VDC (MLA only)

Mounting 1.............. 2” Horizontal Pipe

2 ……….. 2” Vertical Pipe (or wall mount)
Housing /1….….. Cast Aluminum Alloy –(Standard Housing)
/2.…….. SUS316 Cast Stainless and ASTM CF-8M
(/FF1 and /CF1 are pending.)
Electrical /00……..  NPT Female; No Plugs
Connection /10……..  NPT Female; (2) 304 SST Blind Plugs
/20……..  NPT Female; (2) 316 SST Blind Plugs
/30…….. M20 Female; No Plugs
/40…….. M20 Female; (2) 316 SST Blind Plugs
Explosion /FF1 FM Explosion Proof
Protection /CF1 CSA Explosion Proof
Paint Option /X1 Epoxy Resin Paint
/X2 Polyurethane-Epoxy(Anti-Corrosion Paint)
Options /ENG Engineering Unit Calibration (MLD Only)
/ WHT White scale or face plate (MLA Only)
/ SC Scale in Engineering Units (MLA Only)
/ SST SST Tag - Attached to Housing
/SSW

Model MLD (Digital) Model MLA (Analog)

SST Tag – Wired to Housing

ORDERING INSTRUCTIONS

1. Model and suffix codes.

2. Option codes.

3. Scale range and unit markings desired.

4.

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

Mounting