Atec DM70 User Manual

DM70 Hand-held Dewpoint Meter

for Spot Checking and Field Verification

FEATURES/BENEFITS

 New DRYCAP® polymer-based sensor provides

accuracy, reliability, long-term stability and

fast response
 Unique automatic self-calibration
 ± 2° C accuracy down to -58 °F (-50 °C )
 Data logging and transferring capabilities
 Multilingual, menu-based interface
 Numeric and graphical display
 Sample cell adapter for pressurized air lines

The DM70 provides a new level of fuctionality in hand­held dewpoint meters. It serves as an independent data
logger, and an integrated calibration reference for the
DMT242 and DMP246 transmitters.

The DM70 measures dewpoint temperature accurately in
a wide measurement range: from -58 °F to +140 °F
(-50 °C to +60 °C). It features a fast response time
between start-up and low or high process dewpoints.
The DM70 incorporates Vaisalas advanced DRYCAP
polymer-based technology, which enables reliable and
high performance dewpoint measurement. The probe
withstands condensation and may be placed directly in
pressurized spaces.

®

DM70 Hand-held Dewpoint Meter with

optional Sample Cell Adapter

Numerical and graphical measurement data

Measurement data can be displayed numerically or
graphically in the LCD display. One key press changes
the readout to a real time graphics display, so the user
will know when the dewpoint plateau is reached. The
graphic history shows the data curve from the time the
device was turned on. It is easily scalable in the display.

Data-logging & data-transferring capability

The DM70 can be used as an on-site data-logger. To
simplify operation, the DM70 has a sophisticated MI70
Link Windows® software program. It is a practical tool for
transferring logged data and real time measurement data
from the DM70 to a PC.

New Dewpoint Technology

The DRYCAP® measurement technology, with the
patented auto-calibration feature, provides revolutionary
long-term stability that results in a long calibration
interval. Another advantage is the sensors durability
against condensation.

The DM70 is calibrated at the factory against internation­ally traceable standards, and delivered with a calibration
certificate. It can also be sent to a Vaisala Service Center
for a traceable re-calibration.

Various Applications

Spot-checking instrument

The DM70 has a fast response time for temporary
dewpoint measurements. It can be used in industrial
dewpoint spot-checking applications, such as com­pressed air lines and plastic molding processes.

Field-calibration instrument

The DM70 can perform the one-point calibration check
in the process for Vaisalas DMT242 and DMP248 fixed
dewpoint transmitters. Transmitters can be connected to
DM70 with optional connection cables.

DSC74 Sample Cell Adapter

The DM70 can easily be connected to pressurized
processes by using the optional Sample Cell Adapter/
Quick Connector DSC74.

DM70KIT

The DM70 Kit includes:

 DM70 indicator + probe with rechargeable battery

and 115 VAC adapter
 MIK70 Link and analog output signal cable
 DMP74 Probe
 DSC74 Sample cell and quick connector
 Carrying case
 Certificate of calibration, traceable to NIST

100 Commerce Way, Woburn, MA 01801
Tel: 1-888-VAISALA (824-7252) Fax: [phone]
Email: [e-mail] Online: www.vaisala-usa.com

TECHNICAL DATA - DM70

DMP74 Dewpoint Measurement Probe
Measured variables

Dewpoint

Measurement range (typical) -76+140 °F (-60...+60 °C)
Accuracy -50...+60 °C ±3.6 °F (±2 °C)

see the graph below

70
60
50
40
30
20
10

0

-10

-20

-30

-40

-50

-60

-70

-80

Dewpoint temperature ( C)

-10

c

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r

u

c

c

A

n

i

o

p

w

e

D

0

20

Process temperature ( C)

d

T

C

2

±

<

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t

i

m

i

l

r

e

w

o

l

e

g

n

a

r

t

n

e

m

e

r

u

s

a

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m

t

40

3010

60

50

Response time
63% (90%) at flow rate 0.2 m/s, 1 bar pressure, +68 °F (+20 °C)

-58 to 32 °F T
32 to -4 °F T
32 to -40 °F T
32 to -58 °F T

(-50 to 0 °C Td) 10 s [35 s]

d

(0 to -20 °C Td) 10 s [35 s]

d

(0 to -40 °C Td) 15 s [120 s]

d

(0 to -50 °C Td) 35 s [300 s]

d

Temperature

Measurement range 14 °F 140 °F (-10....+60 °C)

Accuracy at +68 °F (+20°C) ±0.36 °F (±0.2 °C)
Typical temperature dependence of electronics ±0.005 °C/°C
Temperature sensor Pt100 IEC751 1/3 class B

MI70 Measurement Indicator
Indicator general

Menu languages English, German, French,

Finnish and Spanish

Display LCD with backlight

Graphic trend display of any parameter

Character height up to 16 mm
Probe inputs 1 or 2
Power Supply Rechargeable NIMH battery pack

with AC-POWER or

4xA4 size alkalines, type IEC LR6
Analog output 0...1 VDC
Output resolution 0.6 mV
Data interface RS232C
Data-logging capacity 900...2700 points with real time
Alarm Audible alarm function

Operating temperature range 14 °F 104 °F (-10....+40 °C)

Operating humidity range non-condensing
Housing classification IP54
Weight 400 g

Battery operation time

Continuous use 48 h typical at +68 °F (+20°C)
Data logging use up to 30 days

DMP74 Probe + MI70 Indicator = DM70 Hand-held
Dewpoint Meter
General

Housing materials ABS/PC blend
Storage temperature -40 158 °F (-40...+70 °C)
Storage humidity 0..100 %RH non condensing
Total weight 750 g

ppm volume concentration

Measurement range (typical) 40...200 000 ppm
Accuracy at +68 °F (+20°C) 7.3 ppm + 8.3% of reading

Relative humidity

Measurement range 0...100 %RH
Accuracy at +68 °F (+20°C)

RH < 10% ±0.025 %RH + 8.75% of reading
RH > 10% ±0.7 %RH + 2% of reading

Measurement environment

Temperature 14 °F 140 °F (-10....+60 °C)

Pressure 0...20 bar
Sample flow rate no effect

Probe general

Sensor DRYCAP180S
Probe material (wetted parts) Stainless steel (AISI 316L)
Sensor protection Sintered filter (AISI 316L)

part no: HM47280

Mechanical connection G1/2" ISO228-1 thread

with bonded seal ring (U-seal)
Housing classification IP65 (NEMA4)
Weight 350 g

Electromagnetic compatibility

Complies with the following standard:
EN 61326-1:1997 + Am1:1998, Electrical equipment for
measurement, control and laboratory use - EMC requirements

- Generic Environment.

Accessories and DM70KIT

DSC74 sample cell adapter

sampling system for pressurized processes
Pressure range 0...10 bar
Weight 300 g

Connection cables

for DMT242 Transmitter order no: 27160ZZ

for DMP248 Transmitter order no: 27159ZZ
Analog output cable order no: 27168ZZ
Windows

Carrying Case MI70Case
DM70 Calibration Kit order no: DM70KIT

Specifications subject to change without prior notice. DRYCAP® is
a registered trademark of Vaisala. ©Vaisala Oyj

®

software including PC connection cable

order no: MI70LINK

includes DM70 indicator with rechargeable battery and 115 VAC

adapter; MIK70 link & analog output signal cable; DMP74 probe;

DSC74 Sample cell and quick adapter; carrying case; certificate of

calibration, traceable to NIST.

g