DM70 Handheld Dewpoint Meter B010162EN-G

DM70 Handheld Dewpoint Meter
for Spot-Checking Applications
• Designed for industrial spotchecking and field calibration
• Three models: accurate
measurement ranges from -60 to
+60 °C (-76 ... +140 °F)
• Vaisala DRYCAPâ Sensor with
unique autocalibration function
• Sensor withstands condensation
• Data can be logged and
transferred to a PC via MI70 Link
• Traceable calibration (certificate
• Fast response, enhanced by
Sensor Purge option
Vaisala DRYCAPâ Handheld Dewpoint Meter DM70 offers accurate and fast
measurement for industrial dew point applications, such as compressed air, metal
treatment and plastics drying.
Intuitive User Interface
Vaisala DRYCAPâ Technology
DM70 is fitted with the Vaisala DRYCAP
Sensor. The sensor provides reliable,
stable and high-performance dew point
measurement. Autocalibration detects
on-line possible measurement
inaccuracies and automatically corrects
dry-end drift in the calibration curve.
• Compact, small and light
• Intuitive user interface
• Low maintenance need due to
superior long-term stability
• Sensor withstands condensation
and fully recovers from getting wet
DM70 measures dew point temperature
accurately over a wide measurement
range. The probe may be inserted
directly into pressurized processes, and it
responds rapidly from ambient to
process conditions. The DM70 meter is
suitable for direct process dew point
measurement in a wide temperature and
pressure range. For more demanding
applications, DM70 can be used with
Vaisala sampling cell adapters or with
Vaisala DRYCAPâ Sampling System
Three Probes to Choose From
Three probe models, all with
autocalibration, are available. The A and
B models are both general purpose
probes. The C model is specifically
developed for SF6 gas. The B and C
probe models have an additional Sensor
Purge feature that heats and dries the
sensor, making the response from
ambient to dry conditions exceptionally
DM70 has a versatile and easy-to-use,
menu-based user interface, a clear
graphical LCD display, and datalogging
capability. It can also be used as a tool
for reading the output of fixed Vaisala
dew point transmitters, such as DMT242,
DMT132, DMT143, DMT152 and DMT340.
DM70 displays one to three parameters
at a time, either numerically or
graphically. Several humidity units can be
selected. In addition, DM70 includes
conversion from gas pressure dew point
to ambient pressure dew point. An
analog output is also available.
MI70 Link
The optional MI70 Link Windows
software and the USB connection cable
form a practical tool for transferring
logged data and real time measurement
data from the DM70 to a PC.
DM70 Technical Data
Measurement Performance,
DMP74A Probe
Dew Point
Dew Point
Measurement range (typical)
-50 ... +60 °C (-58 ... +140 °F)
Dew Point Accuracy vs. Measurement Conditions
Accuracy (A probe) -40 ... +60 °C
Measurement Performance,
DMP74B and DMP74C (for SF6 gas) Probes
±2 °C (±3.6 °F)
(see graph)
Response Time
Flow rate 0.2 m/s, 1 bar pressure,
+20 °C (+68 °F)
63% [90%]
0 → -40 °C Td (32 → -40 °F Td)
20 s [120 s]
-40 → 0 °C Td (-40 → 32 °F Td)
10 s [20 s]
Dew point sensor
Vaisala DRYCAPâ 180S
Measurement range (typical)
-70 ... +30 °C (-94 ... +86 °F)
Dew Point Accuracy vs. Measurement Conditions
Dotted line:
For DMP74C the ±2 °C accuracy range is limited to -50 °C Td when used in SF6
Accuracy (B and C probe) -60 ... +20 °C ±2 °C (±3.6 °F)
(see graph)
Response Time
Flow rate 0.2 m/s, 1 bar pressure,
+20 °C (+68 °F)
63% [90%]
0 → -60 °C Td (32 → -76 °F Td)
50 s [340 s]
Measurement range
-10 ... +60 °C (+14 ... +140 °F)
-60 → 0 °C Td (-76 → 32 °F Td)
10 s [20 s]
Accuracy at +20 °C (+68 °F)
±0.2 °C (±0.36 °F)
Dew point sensor
Vaisala DRYCAPâ 180M
Typical temperature dependence
of electronics
±0.005 °C/°C (±0.005 °F/°F)
Temperature sensor
Pt100 RTD Class F0.1 IEC 60751
Other Variables Available
Dew point converted to atmospheric pressure, ppm volume and ppm weight
concentration, absolute humidity, mixing ratio, relative humidity
Measurement range
-10 ... +60 °C (+14 ... +140 °F)
Accuracy at +20 °C (+68 °F)
±0.2 °C (±0.36 °F)
Typical temperature dependence
of electronics
±0.005 °C/°C (±0.005 °F/°F)
Temperature sensor
Pt100 RTD Class F0.1 IEC 60751
Other Variables Available
Operating Environment, All Probe Models
Operating temperature
-10 ... +60 °C (+14 ... +140 °F)
Operating pressure for DMP74A,
0 ... 20 bara (0 ... 290 psia)
Operating pressure for DMP74C
0 ... 10 bara (0 ... 150 psia)
Sample flow rate
No effect for measurement accuracy
Measured gases
Non-corrosive gases
EMC compliance
EN61326-1, Generic Environment
Mechanical Specifications
Probe material (wetted parts)
Stainless steel (AISI 316L)
Sensor protection
Sintered filter (AISI 316L)
Mechanical connection
G1/2” ISO228-1 thread
with bonded seal ring (U-seal)
IP rating
IP65 (NEMA 4)
350 g
Dew point converted to atmospheric pressure, ppm volume and ppm weight
MI70 Measurement Indicator
Battery Operation Time
Operating Environment
Typical charging time
4 hours
Operating temperature
-10 ... +40 °C (+14 … +104 °F)
Operation Times
Operating humidity
0 ... 100 % RH, non-condensing
Continuous use
48 h typical at +20 ˚C (68 °F)
Storage temperature
-40 ... +70 °C (-40 ... +158 °F)
Data logging use
up to a month
Inputs and Outputs
Max. no of probes
Power supply
Rechargeable NiMH battery pack with
AC adapter or 4xAA size alkalines,
type IEC LR6
PC interface
MI70 Link software with USB or serial
port cable
Analog Output
0...1 VDC
Output resolution
0.6 mV
0.2 % full scale
Temperature dependence
0.002 %/˚C full scale
Minimum load resistor
10 kΩ to ground
Mechanical Specifications
Housing classification
Housing materials
ABS/PC blend
400 g
EMC compliance
EN61326-1, Portable Equipment
Menu languages
English, Chinese, Spanish, Russian,
French, Japanese, German, Swedish,
• LCD with backlight
• Graphic trend display of any
• Character height up to 16 mm
Audible alarm function
Data logging capacity
2700 real time data points
Logging interval
1 s to 12 h
Logging duration
1 min ... memory full
0.01 %RH, 0.01 °C/°F, 0.01 hPa,
0.01 aw, 10 ppm / 0.01 %CO2
MI70 dimensions in millimeters (inches)
Spare Parts and Accessories
Weatherproof Carrying Case
Soft Carrying Case
MI70 Link software with USB cable
MI70 Link software with serial port cable
Analog output cable
10 m (32.81 ft) extension cable for probe
Portable Sampling System
(see separate data sheet)
Connection Cables for Fixed Vaisala Dew Point Transmitters
For DMT242 transmitter
For DMT340 series
For DMT152, DMT143, and DMT132 transmitters
Probe dimensions in millimeters (inches)
Published by Vaisala | B010162EN-G © Vaisala 2017
All rights reserved. Any logos and/or product names are trademarks of
Vaisala or its individual partners. Any reproduction, transfer, distribution
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prohibited. All specifications — technical included — are subject to
change without notice.
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