Vaisala DMP248 Manual de usuario descargar pdf (Pagina 4)

Flexible configuration &

reliable performance

INSTALLATION

The standard procedure for

installation is to insert the probe

through a ball valve directly into the

process itself. The benefits of direct

installation is faster response, easy

installation, and cost effectiveness.

The ball valve enables the probe to

be installed or removed without

draining or shutting down the

process, whether it be a pipe

system, tank or test chamber.

The probe may also be installed

after a ball valve to a so called "leak

position". The probe can then be

equipped with a special bleed

screw through which the process

gas will flow steadily past the

sensor into open air. This bleed

position is recommended for

improving response time when the

Options and accessories

The DMP248 transmitters can be tailored for your application

SERIAL INTERFACE

MODULES

Often several transmitters are

connected to one bus, or a

transmitter is connected to a

computer or some peripheral

device. This can be done easily

via the serial interface. All

DMP248 transmitters have an

RS 232C interface as a standard

feature. The transmitters can also

be fitted with an RS 485/422

interface module or a digital

current loop module as an option.

POWER SUPPLY MODULE

The power supply module can be

used when only mains voltage

(115/230 VAC) is available.

DISPLAY/KEYPAD COVER

The display/keypad option

displays the measurements at the

point of installation. It also makes

the DMP248 transmitters simple

and easy-to-use: the menus help

the user to configure and operate

the transmitter.

ALARM RELAYS

For applications where adjustable

on/off alarm control is needed, the

alarm relay option is the solution.

Alarm relays include two SPCO

(single pole change over) type

relays with 8A / 230V contacts.

They are easy to adjust with a

display keypad or through RS 232.

probe can not be installed into the

main stream of the process.

However, in some cases the probe

cannot be installed into the process.

This may be the case for small

diameter pipes and in very high

temperatures or dirty processes.

Using a sample cell, to which the

probe can be fitted, a

representative sample of

pressurized process gas can be

measured outside the process.

Additional components (e.g. filter,

cooling coil) may be used between

the process and the sample cell.

For applications where the gas

cannot be vented (e.g. non-

pressurized processes, toxic gases)

or a total solution for the sampling is

needed, a configurable sample

system may be purchased. The

sampling system serves as a

controlled method for continuous

monitoring of a representative

sample of gas. The sampling

system would operate within the

sensor’s specifications and ensure a

clean environment enhancing the

sensor’s performance.

Filter options: a standard sintered

filter (left) or a stainless steel filter

for vacuum applications.

SAMPLING SYSTEMS

For aggressive applications, a

configurable sampling system,

DSS10, may be ordered for

additional control of the sampling

gas. This will protect the sensor

from extreme conditions related to

high temperatures and particulates

in the carrier gas.

SAMPLE CELL

The DMP248 probe fits directly to

the sample cell, which can be used

for sample flow measurements.

BALL VALVE SET

The ball valve set enables direct

installation of the probe into the

process without causing process

downtime.

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