DM70 Hand-Held Dewpoint Meter for Spot

DM70 Hand-Held Dewpoint Meter for Spot-Checking Applications

P.O. Box 26, FIN-00421 Helsinki, FINLAND

Tel: +358 9 894 91

Fax: +358 9 8949 2485

Email: [email protected]

www.vaisala.com

The Vaisala DRYCAP®

Hand-Held Dewpoint Meter

DM70 offers accurate and fast measurement for industrial dewpoint 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 dewpoint 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 DMP74 probe models

Three probe models, all with autocalibration, are available. The A and B models are both general purpose probes. The A model is for dewpoint range from -40 to +60 °C T model for -60 to +20 °C T d d

, and the B

. The C model is specifically developed for SF

6

gas with a dewpoint range down to -50 °C T d

.

The B and C probe models have an additional Sensor Purge feature. The

Sensor Purge heats and dries the sensor, making the response from ambient to dry conditions exceptionally fast. This facilitates rapid spot checking measurements in low dewpoints.

66

Low maintenance due to innovative autocalibration

The DM70 is fitted with the Vaisala

DRYCAP® Sensor. The sensor provides reliable and high-performance dewpoint measurement with revolutionary long-term stability. The patented autocalibration procedure detects on-line possible measurement inaccuracies and automatically corrects dry-end drift in the calibration curve.

These advanced features provide a long calibration interval and low maintenance cost.

The meter is calibrated in the factory against internationally traceable standards and delivered with a calibration certificate. The DM70 can also be sent to a Vaisala Service Center for a traceable recalibration.

Easy-to-use user interface

The DM70 has a versatile and easy-touse, menu-based user interface and a clear graphical LCD display with datalogger function. It can also be used as a tool for reading the output of fixed

Vaisala dewpoint transmitters, like the

DMT242, DMT142 and DMP248.

Various display variables

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 dewpoint to ambient pressure dewpoint. An analog output is also available.

The graphical display helps the user to know when the dewpoint plateau is reached.

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DM70 DEWPOINT

MI70 Link PC connection

The DM70 has a MI70 Link Windows® software program for transferring logged and real time measurement data from the DM70 to a PC.

Lightweight construction

The DM70 is small and rugged, and therefore an ideal choice for demanding applications. The long battery life provides convenient use in the field.

DSS70A portable sampling system

The DSS70A is designed to provide dewpoint sampling flexibility. For processes at atmospheric pressure, a battery powered pump is used to extract a gas sample. For pressurized processes up to 20 bar, the sample is measured at process pressure and then reduced to atmospheric pressure for venting or re-direction, bypassing the pump. In all cases, the sample gas passes through a filter to remove particulate contamination before measurement. Flow through the system is controlled and monitored with a needle valve and flow meter.

The DSS70A is easily connected to an appropriate sample point with tubing

(typically 1/4" or 6 mm). The measured dewpoint must be below ambient temperature to avoid condensation in the system. Gas temperatures higher than +40 °C (+104 °F) should be cooled with a short PTFE or stainless steel tube prior to entering the DSS70A.

Sampling cells for pressurized processes

The DM70 can easily be connected to pressurized processes. In addition to direct pipeline installation, a variety of sampling cell options are available for gas sampling.

The DSC74 sampling cell is the recommended choice. It has a variety of connection adapters that allow several different ways of installation.

The quick connector with a leak screw allows a very fast connection for compressed air lines. Additionally, two thread adapters are available for the inlet port.

The DSC74B is a two-pressure sampling cell, which enables measurements in both process and ambient pressure. This sampling cell is especially suitable for dewpoint measurements in SF

6

gas with the

DMP74C probe.

The DMT242SC is a basic sampling cell. The DMT242SC2 is a sampling cell supplied with welded Swagelok connectors for sampling in a 1/4" pipeline.

The DSS70A provides a compact solution for field checking dewpoint where direct measurement is difficult. Typical applications for the sampling system are metal treatment and plastics drying processes.

DM70 Accessories

The DM70 meter is suitable for direct dewpoint measurements in the process 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.

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The sampling cells (from the left) DMT242SC2,

DMT242SC and DSC74 can be used to connect the

DM70 to sample gas flow. The DSC74B (right) is a two-pressure sampling cell that can be used for measurements in either pressurized or ambient pressure. The cooling/venting coil is an option for all sampling cells.

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P.O. Box 26, FIN-00421 Helsinki, FINLAND

Tel: +358 9 894 91

Fax: +358 9 8949 2485

Email: [email protected]

www.vaisala.com

Technical Data

DSS70A Sampling System and

DSC74B/C Sampling Cells

Filter

Sampling Cell for Td Probe Needle Valve Flow meter Sample Pump Sample Gas

Outlet

Sample Gas

Inlet

DSS70A

The DSS70A sampling system includes a filter to clean the dirty sample gas and a needle valve to control the sample flow rate with the flow meter. A sample pump is used to generate a sample flow from processes at ambient pressure.

Measurement

in gas pressure

Sampling Cell for Td Probe

Valve Removable flow limiter

Sample gas inlet

DSC74B

Sample gas outlet

Valve

Sampling Cell for Td Probe

Sample gas outlet

Measurement in

atmospheric pressure

Removable flow limiter

Sample gas inlet DSC74B

DSC74C

Diffusion coil

The DSC74B sampling cell enables the measurement of the sampled gas either in gas pressure up to 10 bar or in atmospheric pressure depending on the gas inlet and outlet.

The DSC74C is like the DSC74B but with an additional coil to avoid back diffusion, the effect of surrounding moisture, in dewpoint measurements in atmospheric pressure.

DM70 hand-held dewpoint meter

(DMP74 probe + MI70 indicator)

General

Battery operation time continuous use data logging use

Housing materials

Storage temperature

Storage humidity

Total weight

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

ABS/PC blend

-40...+70 °C

0...100 %RH non-condensing

750 g

Accessories

Connection cables for fixed Vaisala dewpoint transmitters for DMT242 transmitter order no: 27160ZZ for DMP248 transmitter for DMT142 transmitter order no: 27159ZZ order no: 211917ZZ

Analog output cable order no: 27168ZZ

Windows® software, includes PC connection cable MI70LINK

10 m (32.81 ft) extension cable for probe 213017SP

MI70 indicator

Indicator general

Menu languages

Display

Probe inputs

Power supply

English, French, German, Spanish,

Swedish, Finnish

LCD with backlight

Graphic trend display of any parameter

Character height up to 16 mm

1 or 2

Rechargeable NiMH battery pack with

AC-POWER or 4xAA size alkalines, type IEC LR6

Analog output

Output resolution

Data interface

Datalogging capacity

Alarm

Operating temperature range

Operating humidity range

Housing classification

Weight

0...1 VDC

0.6 mV

RS232

2700 points audible alarm function

-10...+40 °C (+14…+104 °F)

non-condensing

IP54

400 g

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DM70 DEWPOINT

Technical Data

DMP74 dewpoint probes

Measured variables, DMP74A probe

Measurement range (typical)

Accuracy (A probe) -40...+60 °C

-50...+60 °C (-58…+140 °F)

±2 °C (±3.6 °F)

(see graph below)

20

10

0

-10

-20

-30

-40

-50

-60

-70

-80

70

60

50

40

30

-10

Accuracy <

± 2°C T d

Dewpoint me asurement range

lower limit

0 10 20 30

Process temperature (°C)

40 50

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

0 -> -40 °C T d

-40 -> 0 °C T d

Dewpoint sensor

(32 -> -40 °F T d

(-40 -> 32 °F T d

)

)

20 s [120 s]

10 s [20 s]

Vaisala DRYCAP® 180S

60

Dewpoint range for converted Td (20 bar to 1 bar) with ±2 °C (±3.6 °F) accuracy -64...+60 °C (-83...+140 °F)

Measurement range

Accuracy at +20 °C (+68 °F)

Typical temperature dependence of electronics

Temperature sensor

-10....+60 °C (+14…+140 °F)

±0.2 °C (±0.36 °F)

±0.005 °C/°C (±0.005 °F/°F)

Pt100 IEC751 1/3 class B

Measurement range (typical)

Accuracy at +20 °C (+68 °F)

Measurement range

Accuracy at +20 °C (+68 °F)

RH < 5 %

RH > 5 %

40...200 000 ppm

±(7.3 ppm + 8.3% of reading)

0...100 %RH

±(0.025 %RH + 17.5% of reading)

±(0.8 %RH + 2% of reading)

Measured variables, DMP74B and DMP74C (for SF

6 gas) probes

Measurement range (typical)

Accuracy (B and C probe) -60...+20 °C

-70...+30 °C (-94…+86 °F)

±2 °C (±3.6 °F)

(see graph below)

-10

-20

-30

-40

-50

-60

-70

-80

30

20

10

0

70

60

50

40

Dewpoint measurement range high limit

Accuracy < ±2 °C Td

Dewpoint measurement range lower limit

-10 0 10 20 30 40 50 60

Process temperature (°C)

Dotted line:

For DMP74C the ±2 °C accuracy range is limited to -50 °C T d

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 T d

-60 -> 0 °C T d

(32 -> -76 °F T d

(-76 -> 32 °F T

Dewpoint sensor d

)

)

50 s [340 s]

10 s [20 s]

Vaisala DRYCAP® 180M

Dewpoint range for converted Td (20 bar to 1 bar) with ±2 °C (±3.6 °F) accuracy -80...+20 °C (-112...+68 °F)

Measurement range

Accuracy at +20 °C (+68 °F)

Typical temperature dependence of electronics

Temperature sensor

-10....+60 °C (+14…+140 °F)

±0.2 °C (±0.36 °F)

±0.005 °C/°C (±0.005 °F/°F)

Pt100 IEC751 1/3 class B

Measurement range (typical)

Accuracy at +20 °C (+68 °F)

< 40 ppm

> 40 ppm

2...40 000 ppm

±(0.5 ppm + 25.4% of reading)

±(7.3 ppm + 8.3% of reading)

Measurement environment, all probe models

Temperature

Pressure

DMP74A

DMP74B

DMP74C

Sample flow rate

-10....+60 °C (+14…+140 °F)

0...20 bar a

0...20 bar a

0...10 bar a

(0...290 psia)

(0...290 psia)

(0...150 psia) no effect for measurement accuracy

General, all probe models

Measured gases

Probe material (wetted parts)

Sensor protection

Mechanical connection

Housing classification

Weight non-corrosive gases

Stainless steel (AISI 316L)

Sintered filter (AISI 316L) partno: HM47280

G1/2" ISO228-1 thread with bonded seal ring (U-seal)

IP65 (NEMA 4)

350 g

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P.O. Box 26, FIN-00421 Helsinki, FINLAND

Tel: +358 9 894 91

Fax: +358 9 8949 2485

Email: [email protected]

www.vaisala.com

Technical Data and Dimensions

Sampling cells technical data

DSC74 pressure limit

DSC74B pressure limit

DSC74C

DMCOIL

DMT242SC sampling cell for pressurized gases

1 MPa (10 bar g

, 145 psig) two pressure sampling cell

1 MPa (10 bar g

, 145 psig)

DSC74B with DMCOIL cooling/venting coil cooling/venting coil sampling cell pressure limit

DMT242SC2 pressure limit

Material for all sampling cells

10 MPa (100 bar g sampling cell with Swagelo g

, 1450 psig)

connectors

4 MPa (40 bar g

, 580 psig) stainless steel AISI316

DSS70A sampling system

Operating conditions

Operating gases

Dewpoint range

Inlet/outlet connection

Operating temperature air, N

2

and other non-toxic, inert gases

-60 °C...T

amb

(-76 °F…T amb

1/4" SWAGELOK ambient temperature process gas temperature

0...+40 °C (32…+104 °F) with PTFE tube at +20 °C (+68 °F) max. +200 °C (+392 °F) with stainless steel tube specification according to

) stainless steel tube specification maximum gas temperature at inlet +40 °C (+104 °F)

Operating pressure with pump pump disconnected

0.6...1.2 bar a

(8.7...17.4 psia)

0...20 bar a

(0...290 psia)

General

Battery operation time for pump 8 h continuous use battery can be recharged using DM70 charger

Filter 7 mm inline filter cartridge 1/4" SWAGELOK SS-4F-7

(spare part order no. 210801)

Materials wetted parts carrying case

Case size (W x D x H)

Weight

Stainless steel

ABS plastic

430 x 330 x 100 mm

5.5 kg (12 lbs)

Electromagnetic compatibility

Complies with the EMC standard EN61326-1:1997 + Am1:1998 +

Am2:2001; Generic Environment.

Dimensions

Dimensions in mm (inches).

DSC74, same as the body of DMT242SC and DMT242SC2.

SW 24mm (0.94)

32 (1.26)

G1/2"

32 (1.26)

G1/4"

22 (0.87)

G3/8" (G1/4")

Cooling/ venting coil

70

MI70 indicator

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70

DMP74 probe

DSC74B/C

Cable length 2 m

(6.56 ft)

12 m (39.37 ft) cable optional

DRYCAP® is a registered trademark of Vaisala.

Specifications subject to change without prior notice.

© Vaisala Oyj

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DEWPOINT

Excess moisture in compressed air can cause many problems both to the end product and to the components in the air distribution system itself. The DM70 can be used for spot measurements at the compressed air line or for field checks of other dewpoint transmitters.

Photo: Atlas Copco

To ensure the best quality and yield of end products plastics must be sufficiently dry before further processing. The DM70 provides an easy method for checking the plastic dryer performance.

Dewpoint is an important parameter in moisture measurement and control of SF

6

gas insulated equipment, such as high voltage switchgear. The DM70 is an easy and fast hand-held instrument for dewpoint measurement with direct sampling.

Photo: Areva T&D

Distributor: ThermX Southwest

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