Atec DMT348 User Manual
www.vaisala.com
DMT340 Series Dewpoint and Temperature
Transmitters for Very Dry Conditions
The display shows measurement trends,
real time data and history.
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
MODBUS protocol support
▪
(RTU/TCP)
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 auto- calibration makes the
transmitter perform a calibration
and adjustment by itself while the
measured process is running. If
the measurement accuracy is not
confirmed, 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
the user to monitor measurement
trends and one-year history.
The optional data logger with realtime 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 configurable 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.
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.
The Vaisala DRYCAP® HandHeld
Dewpoint Meter DM70 is ideal for field
checking DMT340 transmitters.
The DMT342 probe is installed using
a flange or sampling cell. The small
probe is ideal for integrating into larger
equipment.
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.
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
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"
Dimensions
Dimensions in mm (inches)
Flange intersection
Sampling cell HMP302SC
45°
ø24.5
M6
ø
36 (1.42)
ø
32 (1.26)
45°
16 (0.63)
45°
1/8"-27 NPT
41(1.61)
58.7 (2.31)
1/8"-27 NPT
71.5 (2.81)
81 (3.19)
ø12.5 (0.49)
71 (2.80)
92.5 (3.64)
ø12 (0.47)
Dimensions
Dimensions in mm (inches)
M22x1.5 or
(4.72)
NPT 1/2"
(6.69)
170
Ø12
(0.47)
(1.61)
41
120
9(0.35)
M6
7 (0.28)
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