Vaisala HUMICAP MMT310 Manuel de service télécharger pdf (Page 41)

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DMT340 Series Dewpoint and Temperature

Transmitters for very dry conditions

The Vaisala DRYCAP

Dewpoint and

Temperature Transmitter Series

DMT340 is designed for industrial

low humidity applications. Typical

applications include compressed air

drying and metal treatment. The

device is very reliable, easy to use

and economical to maintain.

Stability in low dew points

The Vaisala DRYCAP

Sensor is

immune to particulate contamination,

water condensation, oil vapor

and most chemicals. Since the

sensor withstands condensation,

its performance is unmatched for

low dew point applications that

experience water spikes in the

process. The sensor recovers rapidly

from contact with free water.

Patented auto-calibration

The stability of the DMT340 is

due to the unique auto-calibration

function, patented by Vaisala.

The display shows measurement trends,

real time data and history.

The auto-calibration makes the

transmitter perform a calibration

and adjustment by itself while the

measured process is running. If

the measurement accuracy is not

conrmed, corrections are made

automatically. The procedure is

so quick and corrections are so

minor that it will go unnoticed.

This ensures low maintenance and

high performance. To continue

performance at the highest level, the

transmitter can be sent to Vaisala

for a NIST traceable calibration.

Calibration intervals depend on the

application; in normal conditions, a

NIST traceable calibration in every

two years is recommended.

Graphical measurement

trend and history display

The DMT340 can be ordered with a

large numerical and graphical display

with a multilingual menu. It allows

Features/Beneﬁts

▪

Measures dew points from

-60 °C to +80 °C (-76 ... +176

°F) with the accuracy of ±2 °C

(±3.6 °F)

▪

Vaisala DRYCAP® Sensor

provides accurate, reliable

measurement with excellent

long-term stability and fast

response

▪

Withstands condensation

▪

Unique auto-calibration feature

▪

Optional alarm relays, local

display and mains power

supply module

▪

Compatible with Vaisala

DRYCAP® Hand-Held Dewpoint

Meter DM70

▪

NIST traceable (certiﬁcate

included)

▪

3 analog outputs and a serial

interface, WLAN/LAN

the user to monitor measurement

trends and one-year history.

The optional data logger with real-

time clock makes it possible to

generate more than four years of

measured history and zoom in on any

desired time or time frame.

The display alarm allows tracking

of any measured parameter, with a

freely congurable low and high limit.

Versatile outputs and

(wireless) data collection

The DMT340 can be connected to a

network with an optional (W)LAN

interface, which enables a (wireless)

Ethernet connection.

The Vaisala DRYCAP

HandHeld

Dewpoint Meter DM70 is ideal for field

checking DMT340 transmitters.tt

For serial interface also the USB

connection, RS232 and RS485 can

be used. Additionally an alarm relay

option is available.

The transmitter can have up to three

analog outputs. Galvanic isolation of

supply power and analog outputs are

also offered.

The recorded measurement data

can be viewed on the display or

transferred to a PC with Microsoft

Windows

software.

Easy installation

The DMT340 has a variety of features

to choose from. Units are delivered

installation-ready.

Dimensions

Dimensions in mm (inches)

Probe speciﬁcations

DMT342 with Small Size

Flanged Probe

Pressure range 0 ... 50 bar/0 ... 725 psia

Mechanical durability up to 250 bar/

3625 psia

Probe diameter 12 mm/0.5 inch

Installation

Flange 36 mm/1.4 inch

Sampling cell HMP302SC

The DMT342 probe is installed using

a flange or sampling cell. The small

probe is ideal for integrating into larger

equipment.

Flange intersection

Sampling cell HMP302SC

36 (1.42)

32 (1.26)

41(1.61)

ø12 (0.47)

1/8"-27 NPT

9(0.35)

7 (0.28)

71.5 (2.81)

92.5 (3.64)

81 (3.19)

71 (2.80)

58.7 (2.31)

(

)

ø24.5

ø12.5 (0.49)

1/8"-27 NPT

Dimensions

Dimensions in mm (inches)

Probe speciﬁcations

DMT344 with Probe for

High Pressures

Pressure range 0 ... 50 bar/0 ... 725 psia

Mechanical durability up to 100 bar/

1450 psia

Probe diameter 12 mm/0.5 inch

Installation

Fitting Body M22 x 1.5

Fitting Body NPT 1/2"

The DMT344 features a threaded

connection for extended pressures

with different fitting body options. It is

ideal for permanent installations into

pressurized or vacuum processes.

NPT 1/2"

170

120

Ø12

M22x1.5 or

(6.69)

(4.72)

(1.61)

(0.47)

Dew Point

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 122 123

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Vaisala HUMICAP MMT310 Manuel de service Page 41

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