Vaisala DM70 Handheld Dewpoint Meter

Features

  • Designed for industrial spot-checking and field calibration.
  • Three models: accurate measurement ranges from −60 to +60 °C (−76 … +140 °F).
  • Vaisala DRYCAP sensor with unique autocalibration function.
  • Sensor withstands condensation.
  • Data can be logged and transferred to a PC via MI70 Link software.
  • Traceable calibration (certificate included).
  • Fast response, enhanced by sensor purge option.
  • Variety of sampling cell options for connection to pressurized processes.
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Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Handheld Dewpoint Meter DM70 for spot-checking applications and field calibration offers accurate and fast measurement for industrial dew point applications, such as compressed air, metal treatment, additive manufacturing as well as food and plastics drying. 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 sensor withstands condensation and fully recovers from getting wet. The DM70 can also be used as a tool for reading the output of fixed Vaisala dew point transmitters, like the DMT132, DMT143 & DMT143L, DMT152, and DMT340.

Where direct measurement is difficult, the DM70 can be used with Vaisala’s sampling cells, or with Vaisala DRYCAP Portable Sampling System DSS70A. The DM70 includes an MI70 indicator and one of the following probe options for different dew point temperatures:

  • DMP74A -40…+60°C Td
  • DMP74B -60…+20°C Td
  • DMP74C -50…+20°C Td (for SF6 gas)

The optional MI70 Link Windows software in combination with a USB connection cable is used to transfer logged data and real-time measurement data from the DM70 to a PC.

Download free MI70 Link Windows® software here.

Dimension

Key Benefits

Get Data Quickly
Fast response time enhanced by sensor purge function ensures quick and accurate data.

Reliable Measurements
The sensor withstands condensation and fully recovers from getting wet.

Intuitive User Interface
Easy-to-use user interface, a clear graphical LCD display, and data-logging capability.

Specification

DMP74A Measurement Performance
Dew point
Measurement range (typical) −50 … +60 °C (−58 … +140 °F)
Dew point accuracy vs. measurement conditions
Accuracy (A probe) −40 … +60 °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 −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 DRYCAP 180S
Temperature
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
Dew point converted to atmospheric pressure, ppm volume and ppm weight
concentration, absolute humidity, mixing ratio, relative humidity.
Operating Environment, All Probe Models
Operating temperature −10 … +60 °C (+14 … +140 °F)
Operating pressure for DMP74A, DMP74B 0 … 20 bara (0 … 290 psia)
Operating pressure for DMP74C 0 … 10 bara (0 … 150 psia)
Sample flow rate No effect on measurement accuracy
Measured gases Non-corrosive gases
EMC compliance EN 61326-1, Basic environment
Mechanical Specifications, All Probe Models
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)
Weight 350 g (12 oz)
DMP74B & DMP74C (for SF6 gas) Measurement Performance
Dew point
Measurement range (typical) −70 … +30 °C (−94 … +86 °F)
Dew point accuracy vs. measurement conditions
Dashed line:
For DMP74C the ±2 °C accuracy range is limited to −50 °C Td when used in SF6 gas.
Accuracy (B and C probe) −60 … +20 °C (−76 … +68 °F) ±2 °C (±3.6 °F)
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]
−60 0 °C Td (−76 32 °F Td) 10 s [20 s]
Dew point sensor Vaisala DRYCAP 180M
Temperature
Measurement range −10 … +60 °C (+14 … +140 °F)
Accuracy at +20 °C (+68 °F) (−76 … +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
Dew point converted to atmospheric pressure, ppm volume and ppm weight concentration
MI70 measurement indicator
Operating Environment
Operating temperature −10 … +40 °C (+14 … +104 °F)
Operating humidity 0 … 100 %RH, non-condensing
Storage temperature −40 … +70 °C (-40 … +158 °F)
Inputs & Outputs
Max. no of probes 2
PC interface MI70 Link software with USB or serial port cable
Analog output 0 … 1 VDC
Power supply Rechargeable NiMH battery pack with AC adapter or 4 × AA size alkalines, type IEC LR6
Output resolution 0.6 mV
Accuracy 0.2 % full scale
Temperature dependence 0.002 %/˚C (0.01 %/˚F) full scale
Minimum load resistor 10 kΩ to ground
Mechanical Specifications
Housing classification IP54
Housing materials ABS/PC blend
Weight 400 g (14 oz)
Compatibility
EMC compliance EN 61326-1, portable equipment
Other
Menu languages English, Chinese, Spanish, Russian, French, Japanese, German, Swedish, Finnish
Display • LCD with backlight
• Graphic trend display of any parameter
• Character height up to 16 mm (0.63 in)
Alarm Audible alarm function
Data logging capacity 2700 real-time data points
Logging interval 1 s to 12 h
Logging duration 1 min … memory full
Resolution 0.01 %RH, 0.01 °C/°F, 0.01 hPa, 0.01 aw, 10 ppm / 0.01 %CO2
Battery Operation Time
Typical charging time 4 hours
Operation times Continuous use: 48 h typical at +20 ˚C (+68 °F)
Data logging use: Up to a month
Spare Parts & Accessories
Weatherproof hard plastic carrying case MI70CASE3
Soft carrying case MI70SOFTCASE
MI70 USB PC connection cable (for use with MI70 Link software) 1) 219687
Analog output signal cable 27168ZZ
Extension cable for probe (10 m (33 ft)) 213107SP
Portable sampling system with case (see separate DSS70A datasheet) DSS70A
Connection cables for fixed Vaisala dew point transmitters
For DMT242 transmitter 27160ZZ
For DMT340 series 211339
For DMT152, DMT132, DMT143, DPT145, and DPT146 transmitters 219980SP
1) Vaisala MI70 Link software for Windows is available at www.vaisala.com/mi70link

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