Rosemount Manual: MLT 3 Addendum for Suppressed Ranges in Gas Purity Applications-4th Ed. | Rosemount Manuals & Guides

Instruction Manual

90002929_ML T 3
12/2007

Addendum

MLT 3 (Suppressed Ranges - Gas Purity)

for Instruction Manual

NGA 2000 Hardware Manual for MLT

th

4

Edition 12/2007

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Instruction Manual

90002929_ML T 3
12/2007

Emerson Process Management (Rosemount Analytical) designs, manufactures and tests
its products to meet many national and international standards. Because these
instruments are sophisticated technical products, you MUST properly install, use, and
maintain them to ensure they continue to operate within their normal specifications. The
following instructions MUST be adhered to and integrated into your safety program when
installing, using and maintaining Emerson Process Management (Rosemount Analytical)
products. Failure to follow the proper instructions may cause any one of the following
situations to occur: Loss of life; personal injury; property damage; damage to this
instrument; and warranty invalidation.

• Read all instructions prior to installing, operating, and servicing the product.

• If you do not understand any of the instructions, contact your Emerson Process

Management (Rosemount Analytical) representative for clarification.

• Follow all warnings, cautions, and instructions marked on and supplied with the
product.

Addendum ML T 3 Gas Purity

ESSENTIAL INSTRUCTIONS

READ THIS PAGE BEFORE PROCEEDING!

• Inform and educate your personnel in the proper installation, operation, and
maintenance of the product.

• Install your equipment as specified in the Installation Instructions of the
appropriate Instruction Manual and per applicable local and national codes.

Connect all products to the proper electrical and pressure sources.

• To ensure proper performance, use qualified personnel to install, operate, update,
program, and maintain the product.

• When replacement parts are required, ensure that qualified people use replacement
parts specified by Emerson Process Management (Rosemount Analytical).
Unauthorized parts and procedures can affect the product’s performance, place the
safe operation of your process at risk, and VOID YOUR W ARRANTY. Look-alike
substitutions may result in fire, electrical hazards, or improper operation.

• Ensure that all equipment doors are closed and protective covers are in place,
except when maintenance is being performed by qualified persons, to prevent
electrical shock and personal injury.

The information contained in this document is subject to change without notice.

1st Edition 05/2004 2

nd

Edition 1 1/2004 3

rd

Edition 08/2007

4th Edition 12/2007

Emerson Process Management
GmbH & Co. OHG

Industriestrasse 1
D-63594 Hasselroth
Germany
T [phone]
F [phone]
Website: www.EmersonProcess.com

Instruction Manual

90002929_ML T 3
08/2007

Addendum ML T 3 Gas Purity

T able of Contents

1. Technical Description 1 - 1

1.1 Front View 1 - 1

1.2 Rear View 1 - 2

1.3 Internal Construction 1 - 3

1.3.1 Internal Gas Paths 1 - 4

2. Start-up 2 - 1

2.1 Installation Site 2 - 1

2.2 Gas Conditioning (Sample Handling) 2 - 1

2.2.1 Fine Dust Filter 2 - 2

2.2.2 Pressure Sensor 2 - 2

2.2.3 Gas Flow 2 - 2

2.3 Gas Connections 2 - 2

2.3.1 MLT 3 with solenoid valve block 2 - 3

3. Switching On 3 - 1

4. Calibration Procedure 4 - 1

4.1 Measurement 4 - 1

4.2 Calibration 4 - 1

4.2.1 Test Gases 4 - 2

4.2.2 Purge Time 4 - 2

5. Maintenance 5 - 1

6. Technical Data 6 - 1

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I

Addendum ML T 3 Gas Purity Instruction Manual

90002929_ML T 3

08/2007

II

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Instruction Manual

90002929_ML T 3
12/2007

Addendum ML T 3 Gas Purity

1. Technical Description

The ML T 3 analyzer for suppressed ranges in the gas purity application is part of the NGA 2000
MLT family . The MLT 3 is enclosed in a 19 " housing with thermostat control (55 °C). The physical
part (photometer bench, sensors etc.) is separated from the electronic part
(see also Fig.1-3)
The ML T 3 gas analyzer for N2O, CO2 or PO2 gas purity can measure in two measuring modes:

1. absolute range: 0 - 100 % CO2/ N2O / PO2 (paramagnetic oxygen)

2. suppressed range: 95 or 98 - 100 % CO2 / N2O / PO

Suppressed ranges, like 95 or 98-100 % CO2, N2O or PO2 , are strongly influenced by pressure,
temperature, flow and ambient CO2 and water vapor. Special means are necessary to keep these
factors as constant as possible to reduce their influence on the measurement.
An internal pressure regulator, capillary , pressure, temperature and flow sensor are provided to
control flow and allow compensation for temperature and barometric pressure variations.
A special calibration procedure is necessary to achieve the requested suppressed range (see
chapter 4). Purge of the optical bench with constant CO2 and H2O is requested (0.1-0.2 l/min).
The installation of the complete analytical equipment (MLT 3 gas analyzer, sample handling
system and calibration gases [zero and span gas] ) should be in an air conditioned room or at least
in a well ventilated room to fulfill the permissible ambient temperatures (20 to 30 °C).

2

1.1 Front View

The front panel of the analyzer is the operating front panel (see Fig. 1-1).
Measured values and the entire operating procedure are displayed on a LC display. The
operation and programming of the instrument is performed by using the four cursor keys, the
ENTER key and the five soft keys (see separate ML T Software Manual).
The MLT 3 front panel for gas purity measurements is identical with the standard MLT 3 front panel.
The internal mounting is described later under "Internal Construction" (see Fig. 1-3, 1-4).

F 3F 1 F 2 F 4 F 5

NGA 2000

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Fig. 1-1: MLT 3 (1/1 19" housing), front view

1 - 1

Addendum ML T 3 Gas Purity

1.2 Rear View

Network connection (RJ 45 socket)

Instruction Manual

90002929_ML T 3

12/2007

IN

Ch 1

OUT

IN

Ch 2

OUT

optional PCB [SIO/DIO e.g.]

Input 230/120 V ac (UPS 01 T)

Gas connections

Fig. 1-2a: MLT 3 (standard version), Rear view

See Figures 1-2a and 1-2b for differences between the "standard ML T 3" and the "MLT 3 for
gas purity measurement". The "ML T 3 for gas purity measurement" is equipped with a

solenoid valve block for the supply of sample, zero and span gas, which is controlled by the
analyzer. The control is done with the relay outputs of I/O Board "SIO" via an external
connection cable "SIO => Solenoid V alve Block" (pin assignments see Fig. 21-4 in the
standard ML T manual).The gas connections are shown in Fig. 1-2b and are marked specific
to the application. The outlet of the valve block is connected to the gas inlet of the ML T 3.

Sub.-min. D, 9 pole

(to Solenoid Valve Block)

NETWORK

DIGITAL I/O

Sub.-min. D, 9 pole

(connection to PCB “SIO”)

!

Inlet Pressure:
min. 20 psig
max. 25 psig

Span gas

Out (Outlet)

230/120 V

50/60 Hz

max. 240 VA

Sample gas

Purge Gas Connections

(Purge Gas Inlet & Outlet)

Purge IN

IN (Inlet)

ANALOG I/O SERIAL I/O

Zero gas

OUT (Outlet)

Purge OUT

PCB "SIO" Sample Gas Connections

Input 230/120 V ac (PS UPS 01 T) Solenoid Valve Block

(Gas Inlet & Outlet)

Fig. 1-2b: MLT 3 (gas purity measurement), Rear view

1 - 2

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Instruction Manual

90002929_ML T 3
12/2007

Addendum ML T 3 Gas Purity

1.3 Internal Construction

The photometer assembly and physical parts is located on the left side (front view) while the
electronic part with interconnection board and PCBs is located on the right.

Gas connections

(Gas inlet via valve

block, gas outlet,

Purge inlet/outlet, 1/4")

Pressure

Sensor

Flow

Sensor

Heating

Unit

Solenoid valve block

(zero, span & sample gas inlet, 1/8 ")

Power Supply

(UPS 01 T)

Card cage
(electronic

boards)

Pressure
regulator

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Photometer bench

(MLT 3, suppressed range)

Fig. 1-3: MLT 3 (gas purity measurement), Top view

Fan

Operating Front Panel

(MLT 3 analyzer)

1 - 3