Vaisala HMD70U Service Manual Page 80
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78
DM70 Hand-Held Dewpoint Meter
for Spot-Checking Applications
The Vaisala DRYCAP
®
Hand-Held Dewpoint Meter DM70
offers accurate and fast measurement for industrial dew point
applications, such as compressed air, metal treatment and
plastics drying.
Features/Benefits
▪
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 patented
autocalibration function
▪
Low maintenance need due to superior long-term
stability
▪
Sensor withstands condensation
▪
Fast response, enhanced by Sensor Purge option
▪
Easy-to-use user interface
▪
Data can be logged and transferred to a PC via
MI70 Link software
▪
Compact, small and light
▪
NIST traceable (certificate included)
The Vaisala DRYCAP
®
Hand-Held Dewpoint Meter 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.
Three probe models, all with auto-calibration, are
available. The A and B models are both general purpose
probes. The C model is specifically developed for SF
6
gas.
The B and C probe models have an additional Sensor
Purge feature that heats and dries the sensor, making the
Technical Data
response from ambient to dry conditions exceptionally
fast.
The 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.
The DM70 has a versatile and easy-to-use, menu-based
user interface, a clear graphical LCD display, and data-
logging capability. It can also be used as a tool for reading
the output of fixed Vaisala dew point transmitters, like the
DMT242, DMT132, DMT142, DMT152 and DMT340.
The DM70 displays one to three parameters at a time,
either numerically or graphically. Several humidity units
can be selected. In addition, the DM70 includes conversion
from gas pressure dew point to ambient pressure dew
point. An analog output is also available.
The DM70 meter is suitable for direct process dew point
measurement in a wide temperature and pressure range.
For more demanding applications, the DM70 can be used
with the Vaisala sampling cell adapters, or with the Vaisala
DRYCAP
®
Sampling System DSS70A.
Measured Variables, DMP74A Probe
DEW POINT
Measurement range (typical) -50 ... +60 °C (-58 ... +140 °F)
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 T
d
(32 -> -40 °F T
d
) 20 s [120 s]
-40 -> 0 °C T
d
(-40 -> 32 °F T
d
) 10 s [20 s]
Dew point sensor Vaisala DRYCAP
®
180S
Dew point accuracy
vs. measurement
conditions
- HUMIDITY / DEW POINT / 1
- PRESSURE / WEATHER 1
- ACC URATE 2
- Humidity 4
- Dew Point 4
- Mounting Options 9
- Graphical Display of 10
- History and 10
- Measurement Trends 10
- Outputs and Power Supply 10
- Options for Every Need 10
- Flexible Installation 11
- For Moderate Humidities 11
- Vaisala HUMICAP® 12
- Performance 12
- Measurement Trends and 12
- Real Time History 12
- 41 (1.6) 13
- 51 (2.0) 13
- 192 (7.56) 13
- 253 (9.96) 13
- 37.5 (1.48) 14
- 79.5 (3.13) 14
- 99.5 (3.92) 14
- Temperature Transmitters 16
- HMP361 for wall mounting 17
- HMP363 for confined spaces 17
- HMP364 for high pressure 17
- HMP365 for high temperature 18
- HMP367 for high humidities 18
- HMP368 for pressurized 18
- Transmitter 22
- Interchangeable Probe 24
- Fast, On-Site Calibration 26
- Measures both Humidity 26
- Resistant to Chemicals 28
- Vaisala INTERCAP 30
- Humidity and Temperature 30
- Transmitter Series HMW80 30
- HVACApplications 32
- Demanding Applications 34
- Unique Warmed Probe 34
- Vaisala HUMICAP® Sensor 34
- Chambers 36
- Probe HMP60 38
- Vaisala HUMICAP 40
- Probe HMP110 40
- Three Probes 42
- MI70 Link 42
- Reliable and Cost-ecient 47
- HVAC Products 47
- Fast and Easy-to-Use 48
- HMK15 Humidity Calibrator 50
- DTR500 Solar Radiation 54
- Versatile Outputs and 61
- (Wireless) Data Collection 61
- Easy Installation 61
- Probe Specifications 62
- Ensure dry 65
- Measure Humidity Directly 66
- DMT345, Accurate in Hot 66
- OEM Applications 70
- Low Maintenance 72
- Dewpoint temperature (°C) 75
- DMT132 Dewpoint Transmitter 76
- DEW POINT 77
- CALCULATED VARIABLES 77
- Indoor Applications 78
- 110 (4 .33) 79
- 85 (3.35) 79
- 33 (1.30) 79
- DSS70A Portable 82
- Sampling System 82
- Sampling Cells for 82
- Pressurized Processes 82
- Online Reliability 86
- Savings Across the Board 86
- Risk-Free, Greener 86
- Solution 86
- The Fruit of Experience 86
- Multiparameter Transmitter 88
- When Moisture is a Problem 89
- Knowledge is Power 89
- Literally 89
- Transmitter Series for Oil 90
- Moisture in Oil 90
- The Vaisala HUMICAP 91
- Hand-Held 91
- R1/2" ISO7/1 92
- Prevent it 95
- Transmitter for Oil 96
- Features/Benefits 100
- Technical Data 101
- 0 ... 2 % 102
- Interchangeable Probes 104
- Demanding OEM Applications 106
- GMM111 Carbon Dioxide Module 108
- Vaisala CARBOCAP 110
- Technology 110
- Two Sampling Methods 110
- Features/Benefi ts 112
- Demand-controlled Ventilation 114
- GMM112 Carbon Dioxide Module 118
- GMM20W Carbon Dioxide Module 120
- Pressure 122
- PTU300 Models 123
- Mechanics 126
- Accessories 126
- Dimensions 126
- IN CONTROLLED ENVIRONMENTS 127
- Take the Lab to the Field 130
- For more information, visit 131
- Standard PTB330TS 132
- PTB210 Digital Barometer 134
- Calculate 137
- Vaisala BAROCAP® 138
- Accuracy and Stability 138
- Applications 138
- Ideal for outdoor 140
- Carefree maintenance 140
- Operating Environment 142
- Available Options 142
- Figure 1 143
- Figure 2 with Process 143
- Valve Actuator and 143
- Test Jacks 143
- Measuring Acoustic 146
- Precipitation 146
- Wind Measurement 150
- Vaisala Service Offering 152
- Accredited Body 153
- Accredited Parameters 153
- Vaisala Filters 154
- Vaisala Filters continued 155
- Vaisala Contact Information 158
- ASIA AND PACIFIC 159
- NORTH AMERICA 159
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