Instruction manual

NGA 2000 MLT Hardware
TECHNICAL DESCRIPTION
1 - 23
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
01/2007
1.6.1 MLT 3 (Gas purity measurement)
Special versions of MLT 3 are available with suppressed ranges for gas purity measurements and
measurements requiring physics thermostated up to 120 °C - see separate manual for gas
purity with suppressed ranges.
Example and short description of the main deviations from standard MLT 3:
Compared with “standard MLT 3 version” the “MLT 3 for gas purity measurement” can be
equipped with a divided front panel.
On the right side there is the operation front panel (analyzer) or a blind plate (analyzer module)
resp.
On the left side there is built-in one flow meter and as option one quick shutoff connector as sample
gas inlet.
Is the instrument is not equipped with a solenoid valve block, there can be built-in as option a
manual 4/2-way-valve to switch to sample gas, zero gas or span gas.
For more detailed informations use the special instruction manual for this application.
Fig. 1-22a: MLT 3 (example for gas purity measurement), front view
MLT3 (GAS PURITY MEASUREMENT)
Flow meter Operation front panelQuick shutoff connector
(sample ges input, option)
Manual 4/2-way-valve
(option)
Rosemount Analytical
NGA 2000
F3 F4 F5F2
F1
Additional to “standard MLT 3 version” (identical on the left part) the “MLT 3 for gas purity
measurement” is equipped with a solenoid valve block for the supply of sample gas, zero gas
and span gas, controlled by the analyzer. The control will be done with the relay outputs of I/
O Board “SIO” via an external connection cable “SIO ➞ Solenoid Valve Block” (pin
assignments look at Fig. 21-4).
The necessary gas connections are placed here too and are used and marked analyzer
specific (see Fig. 1-23). The outlet of the valve block is connected to the MLT 3 gas inlet.