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)
The DMT347 probe is ideal for tight
spaces with thread connection. The
small probe is installed using the
Swagelok
®
connectors.
Probe Specifications
DMT347 with Small Sized Probe
Pressure range 0 ... 10 bar/0 ... 145 psia
Mechanical durability up to 10 bar/
145 psia
Probe diameter 12 mm/0.5 inch
Installation
Fitting Body R 3/8" ISO
Fitting Body G 1/2" ISO
Fitting Body NPT 1/2"
Dimensions
Dimensions in mm (inches)
(3.31)
84
(1.61)
41
)74.0(
21 Ø
ISO Gor
”2/1
”2/1 TPN
/ ”8/3 OSI
Hex 22 mm
(0.87)
The DMT348 is ideal for installations
in pressurized processes where the
probe needs to be removed while the
process is running. The probe depth is
adjustable.
Probe Specifications
DMT348 with Probe for
Pipeline Installations
Pressure range 0 ... 40 bar/0 ... 580 psia
Adjustable length 41 ... 149/371 mm/
1.61 ... 5.87/14.6 inch
Installation
Fitting Body R1/2" ISO
Fitting Body NPT 1/2"
Ball Valve Set BALLVALVE-1
Sampling Cell DMT242SC or
DMT242SC2
Dimensions
Dimensions in mm (inches)
/ 448 (17.6)
215.5 (8.48)
/ 410 (16.1)
Ø
13.5 (0.53)
191 (7.52)
R1/2” ISO7/1
41 (1.61) - 149 (5.87) / 41 (1.61) - 379 (14.9)
Ø
12 (0.47)
41 (1.61)
35 (1.37)
Optional filter for low pressures
(for all models)
Technical Data
Measured Parameters
DEW POINT
Sensor Vaisala DRYCAP®180M
Measurement range -60 ... +80 °C (-76 ... +176 °F) Td
For continuous use -60 ... +45 °C (-76 ... +113 °F) Td
Accuracy
up to 20 bar/290 psia ±2 °C/±3.6 °F see the accuracy
graph below
20 ... 50 bar/290 ... 725 psia additional inaccuracy +1 °C Td
Dew point accuracy vs. measurement conditions
Response time 63% [90%] at +20°C gas temperature
Flow rate 1 l/min and 1 bar pressure
-60 ... -20 °C Td (-76 ... -4 °F Td) 5s [10s]
-20 ... -60 °C Td (-4 ... -76 °F Td) 45s [10min]
TEMPERATURE
Measurement range 0 ... +80 °C (+32 ... +176 °F)
Accuracy ±0.2 °C at room temperature
Temperature sensor Pt100 RTD Class F0.1 IEC 60751
RELATIVE HUMIDITY
Measurement range 0 ... 70 %RH
Accuracy (RH <10 %RH, at + 20 °C) ±0.004 %RH + 20 % of reading
PPM
Measurement range (typical) 10 ... 2500 ppm
Accuracy (at + 20 °C, 1 bar) 1 ppm + 20 % of reading
Other measurement parameters available (depends on model)
mixing ratio, absolute humidity, pressure dew point calculated
to 1 bar, temperature difference (T-Td), water vapor pressure
Operating Environment
Operating temperature
for probes -40 ... +80 °C (-40 ... +176 °F)
Mechanical durability Up to +180 °C (+356 °F)
for transmitter body -40 ... +60 °C (-40 ... +140 °F)
with display 0 ... +60 °C (+32 ... +140 °F)
Storage temperature range -55 ... +80 °C (-67 ... +176 °F)
Pressure range for probes See probe specifications
Sample flow rate No effect
Measured gases non corrosive
Complies with EMC standard EN61326-1, Electrical equipment
for measurement, control and laboratory use - EMC requirements;
Industrial environment.
Inputs and Outputs
Operating voltage 10 ... 35 VDC, 24 VAC
with optional power supply module 100 ... 240 VAC 50/60 Hz
Power consumption @ 20 °C (U
RS-232 max 25 mA
2 x 0...1V / 0...5V / 0...10V max 25 mA
U
out
2 x 0...20 mA max 60 mA
I
out
display and backlight + 20 mA
during sensor purge + 110 mA max
Analog outputs (2 standard, 3rd optional)
current output 0 ... 20 mA, 4 ... 20 mA
voltage output 0 ... 1 V, 0 ... 5 V, 0 ... 10 V
Accuracy of analog outputs at 20 °C 0.05 % full scale
Temperature dependence of the
analog outputs ± 0.005 %/°C full scale
External loads
current outputs R
0 ... 1V output R
0 ... 5V and 0 ... 10V outputs R
Max wire size 0.5 mm
Digital outputs RS-232, RS-485 (optional)
Service connection RS-232, USB
Relay outputs 0.5 A, 250 VAC, SPDT (optional)
Ethernet interface (optional)
Supported standards 10/100Base-T
Connector RJ45
Protocols Telnet
WLAN interface (optional)
Supported standards 802.11b
Antenna connector type RP-SMA
Protocols Telnet
Security WEP 64/128,WPA
Authentication / Encryption
Open / no encryption
Open / WEP
WPA Pre shared key / TKIP
WPA Pre shared key / CCMP (a.k.a. WPA2)
Optional data logger with real-time clock
Logged parameters max. three with trend/min/max values
Logging interval 10 sec (fixed)
Max. logging period 4 years 5 months
Logged points 13,7 million points per parameter
Battery lifetime min. 5 years
Display LCD with backlight, graphic
Display menu languages English, Chinese, Spanish, German,
24VDC)
in
< 500 ohm
L
> 2 kohm
L
> 10 kohm
2
(AWG 20) stranded wires recommended
L
trend display of any parameter
French, Japanese, Russian, Swedish,
Finnish
77
71
(2.80)
(3.03)
Mechanics
Cable bushing M20x1.5 for cable diameter 8 ... 11mm/0.31 ... 0.43”
Conduit fitting 1/2”NPT
User cable connector (optional) M12 series 8 pin (male)
option 1 with plug (female) with 5 m / 16.4 ft black cable
option 2 with plug (female) with screw terminals
USB-RJ45 Serial Connection Cable order no. 219685
Probe cable diameter 5.5 mm
Probe cable lengths 2 m, 5 m or 10 m
Housing material G-AlSi 10 Mg (DIN 1725)
Housing classification IP 65 (NEMA 4X)
Dimensions
Dimensions in mm (inches)
(2.80)
71
(3.03)
77
(7.20)
183
(6.65)
169
(4.57)
116
DRYCAP® is a registered trademark of Vaisala.
(3.78)
96
(0.28)
7
Ø
www.vaisala.com
Please contact us at
www.vaisala.com/requestinfo
Scan the code for
more information
TYPE APPROV ED PRODUCT
CERTI FICATE NO.: A-11440
Ref. B210952EN-C ©Vaisala 2012
This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifications — technical included — are subject
to change without notice.
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