Vaisala DM70 Technical data

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.

response from ambient to dry conditions exceptionally fast.

The DM70 is tted with the Vaisala DRYCAP 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 datalogging capability. It can also be used as a tool for reading the output of xed Vaisala dew point transmitters, like the DMT242, DMT142, DMT152 and DMT340.

The DM70 displays one to three parameters at a time,

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 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 specically developed for SF The B and C probe models have an additional Sensor Purge feature that heats and dries the sensor, making the

Hand-Held Dewpoint Meter DM70

gas.

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.

Technical data

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)

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

www.vaisala.com

Sensor. The

(see graph)

Dew point accuracy vs. measurement conditions

180S

Technical data

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 IEC751 1/3 class B

OTHER VARIABLES AVAILABLE

Dew point converted to atmospheric pressure, ppm volume and ppm weight concentration, absolute humidity, mixing ratio, relative humidity

Measured variables, DMP74B and DMP74C (for SF6 gas) probes

DEW POINT

Measurement range (typical) -70 ... +30 °C (-94 ... +86 °F) Accuracy (B and C probe) -60...+20 °C ±2 °C (±3.6 °F)

(see graph)

Dew point accuracy vs. measurement conditions

Dotted line: For DMP74C the ±2 °C accuracy range is limited to -50 °C T

when

used in SF6 gas. 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

TEMPERATURE

180M

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 IEC751 1/3 class B

OTHER VARIABLES AVAILABLE

Dew point converted to atmospheric pressure, ppm volume and ppm weight concentration

All probe models

Operating temperature -10 ... +60 °C (+14 ... +140 °F) Operating pressure

DMP74A, DMP74B 0 ... 20 bara (0 ... 290 psia) DMP74C 0 ... 10 bara (0 ... 150 psia)

Sample ﬂow rate no effect for measurement accuracy Measured gases non-corrosive gases Probe material (wetted parts) Stainless steel (AISI 316L) Sensor protection Sintered ﬁlter (AISI 316L)

partno: HM47280

Mechanical connection G1/2” ISO228-1 thread

with bonded seal ring (U-seal) Housing classiﬁcation IP65 (NEMA 4) Weight 350 g

MI70 indicator, general

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 Max. no of probes 2 Power supply Rechargeable NiMH battery pack with AC-adapter

or 4xAA size alkalines, type IEC LR6

Analog output 0...1 VDC

Output resolution 0.6 mV PC interface MI70 Link software with USB or serial port cable Datalogging capacity 2700 points Alarm Audible alarm function Operating temperature range -10...+40 °C (+14…+104 °F) Storage temperature range -40 ... +70 °C (-40 ... +158 °F) Operating humidity range 0 ... 100 % RH, non-condensing Housing classiﬁcation IP54 Housing materials ABS/PC blend Weight 400 g Battery operation time with DMP74 probe

continuous use 48 h typical at +20 °C (+68 °F)

data logging use up to a month, depending on logging interval Electromagnetic compatibility EN 61326-1, Generic Environment

Accessories

Connection cables for ﬁxed Vaisala dew point transmitters

for DMT242 transmitter 27160ZZ

for DMT340 series 211339

for DMT152 transmitter 219980

for DMT142 transmitter 211917ZZ MI70 Link software with USB cable 219687 MI70 Link software with serial port cable MI70LINK Analog output cable 27168ZZ 10 m (32.81 ft) extension cable for probe 213107SP

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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.