Vaisala DRYCAP DM70 User manual

M212551EN-A

Quick Guide

Vaisala DRYCAPâHandheld Dew Point Meter

DM70

PUBLISHED BY

Vaisala Oyj

Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland

P.O. Box 26, FI-00421 Helsinki, Finland

+358 9 8949 1

Visit our Internet pages at www.vaisala.com.

No part of this document may be

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electronic or mechanical (including

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modiﬁed, translated, adapted, sold or

disclosed to a third party without prior

written permission of the copyright holder.

Translated documents and translated

portions of multilingual documents are

based on the original English versions. In

ambiguous cases, the English versions are

applicable, not the translations.

The contents of this document are subject

to change without prior notice.

Local rules and regulations may vary and

they shall take precedence over the

information contained in this document.

Vaisala makes no representations on this

document’s compliance with the local

rules and regulations applicable at any

given time, and hereby disclaims any and

all responsibilities related thereto.

This document does not create any legally

binding obligations for Vaisala towards

customers or end users. All legally binding

obligations and agreements are included

exclusively in the applicable supply

contract or the General Conditions of Sale

and General Conditions of Service of

Vaisala.

This product contains software developed

by Vaisala or third parties. Use of the

software is governed by license terms and

conditions included in the applicable

supply contract or, in the absence of

separate license terms and conditions, by

the General License Conditions of Vaisala

Group.

Table of contents

1. Introduction to DM70....................................................................................3

1.1 Parts description...............................................................................................4

1.2 Measurement in dry environments.................................................................4

2. MI70 indicator.................................................................................................. 6

2.1 MI70 indicator parts..........................................................................................6

2.2 MI70 status icons...............................................................................................7

2.3 Installing and recharging MI70 batteries........................................................7

3. Taking measurements................................................................................... 9

3.1 MI70 ﬁrst start-up settings.............................................................................. 9

3.2 Basic measuring steps with DM70..................................................................9

3.2.1 Conﬁguring pressure settings................................................................ 10

3.2.2 Autocalibration.......................................................................................... 11

3.2.3 Sensor purge..............................................................................................11

3.3 Sampling cells.................................................................................................. 12

3.3.1 Connecting to pressurized processes using DSC74 sampling cell..... 12

3.4 Measuring multiple parameters simultaneously......................................... 14

4. User interface.................................................................................................. 16

4.1 Basic display.....................................................................................................16

4.2 Graphical display............................................................................................. 16

4.3 Main menu........................................................................................................ 17

5. Maintenance.....................................................................................................19

5.1 Changing the rechargeable battery pack.....................................................19

Maintenance and calibration services......................................................... 21

Technical support............................................................................................. 21

Warranty.............................................................................................................21

Recycling............................................................................................................ 21

Table of contents

DM70 Quick Guide M212551EN-A

1. Introduction to DM70

Vaisala DRYCAPâHandheld Dew Point Meter DM70 measures dew point temperature

accurately in measurement range −60 °C … +60 °C (−76 … +140 °F), depending on the probe

model. DM70 consists of 2 main units: the MI70 indicator and DMP74 probe, models A, B, or C.

DM70 can be used with an optional sampling cell to measure process dew point. It can also be

used as a tool for reading the output of ﬁxed Vaisala dew point transmitters, such as DMT242,

DMT132, DMT143, DMT152, and DMT340.

DM70 measures the following parameters:

Table 1 Display parameters

Parameter Abbreviation Metric unit Non-metric unit

Relative humidity RH %RH %RH

Temperature T °C °F

Dew point/frost point

temperature 1)

Td/f °C °F

Dew point temperature 2) Td°C °F

Dew point in the atmospheric

pressure

Td°C atm °F atm

Dew point/frost point in the

atmospheric pressure

Td/f °C atm °F atm

Absolute humidity a g/m3gr/ft3

Mixing ratio x g/kg gr/lb

Water concentration /

Water mass fraction

H2O ppmv/ ppmwppmv/ ppmw

1) Td/f shows dew point temperature above the freezing point (0 °C/32 °F) and frost point

temperature Tf(dew point over ice) below the freezing point. This is considered as the

industry standard.

2) Tdshows dew point over water throughout the entire measurement range.

This Quick Guide introduces the features of the MI70 indicator and the basic measurement

procedure with the DM70 meter.

For the full DM70 operating instructions, speciﬁcations, and more information on sampling

cells, download DM70 User Guide (M010091EN) from www.vaisala.com/dm70.

Chapter 1 – Introduction to DM70

1.1 Parts description

Figure 1 DM70 parts

1Charger socket

2MI70 indicator

3Connector ports for probes and cables

4Calibration button

5Sampling cell DSC74 (optional)

6DMP74 probe

1.2 Measurement in dry environments

The following recommendations should be taken into account when measuring in very dry

environments:

• A clean environment is always best for humidity measurements.

• The number of connections should be minimized to avoid leaks.

• The ﬂow rate must be adequate.

• Dead ends must be avoided as they cannot be ﬂushed easily.

DM70 Quick Guide M212551EN-A

• The tube temperature must never lie under the dew point of the sample gas. This may

lead to condensation and false results.

• The sample tubing should be of as short length as possible. The surface area should be

minimized using the narrowest tubing that the ﬂow conditions allow.

• The surface ﬁnish of the pipework is important. Polished or electro-polished steel is

recommended for best results.

• Hygroscopic materials should be avoided in the sampling lines. Use stainless steel

membranes instead of rubber membranes.

• Impermeable materials should be selected to avoid inward diusion of moisture through

the sampling tubes and enclosures. Such impermeable materials are, for example, high-

quality stainless steel and metals. Avoid PVC or nylon tubes.

Chapter 1 – Introduction to DM70

2. MI70 indicator

Vaisala MI70 handheld indicator is a portable tool for viewing the measurements, recording the

data, and conﬁguring the settings of connected Vaisala instruments. MI70 indicators can be

used with a wide range of Vaisala instruments, and are also delivered as part of the probe and

indicator product packages DM70, GM70, HM70, and MM70.

2.1 MI70 indicator parts

Figure 2 MI70 indicator parts

1Charger socket

2Function key shortcut buttons . The

functions change according to what

you are doing with the indicator.

3Arrow buttons:

Move up in a menu

Move down in a menu

Enter a sub-menu

Return to previous menu level

4Power On/O button

5Battery compartment at the back of

the indicator

62 ports (labeled I and II) for

connecting probes and instruments.

To open menus, press an arrow button and then press the shortcut buttons. To activate a

function shown above the shortcut button, press the shortcut button. To navigate in the

menus, press the arrow buttons.

DM70 Quick Guide M212551EN-A

2.2 MI70 status icons

Icons that inform you about the status of MI70 (for example, battery status and alarm notiﬁcation)

are shown on the upper left corner of the display. Multiple icons can be shown simultaneously.

Table 2 MI70 status icons

Icon Description

Battery status icon. The icon can show the following info:

• 0 ... 8 bars, no animation:

• batteries are in use, a charger is not connected

• if a charger is connected: non-rechargeable batteries installed

• if a charger is connected: waiting for the battery temperature to settle

between 0 ... +40 °C (+32 ... +104 °F)

• if a charger is connected and the icon remains at 8/8 bars: the battery is

full

• Animated battery status icon: battery is charging (or recovering after

emptying out completely). The charging animation is shown also when the

indicator is powered o.

• Battery icon not present: batteries are not installed

The battery can no longer be charged and must be replaced. If the indicator is

powered on, a notiﬁcation about not being able to charge the battery is shown

on the MI70 screen.

You can order replacement batteries from Vaisala (item code 26755).

Recording icon. Shows that the measurements are being recorded. The bar

shows for how long the recording will continue (a set time limit or until the

memory runs out). The recording icon and bar are shown also when the

indicator is powered o.

Calibration reminder icon. Appears when a calibration reminder has been set

to inform that a user-deﬁned interval has passed and calibration is due.

Analog output icon. Shown when the analog output mode is in use.

PC connection icon. Shown when the indicator is connected to a PC with a

cable.

Alarm icon. Shown when the measurement has reached a user-deﬁned alarm

limit.

2.3 Installing and recharging MI70 batteries

If you are using alkaline batteries, unscrew the back plate of the indicator and insert the

batteries. Do not attempt to recharge standard alkaline batteries.

If you ordered MI70 with a rechargeable battery, it is already in place as shipped from the

factory. The delivered batteries have been pre-charged.

Chapter 2 – MI70 indicator

The status of the MI70 battery is shown by the battery icon in the upper left corner of the

display. Possible statuses are listed in Table 2 (page 7).

To recharge the rechargeable battery:

1. Plug in the charger connector to the MI70 indicator. The socket is located at the top of the

indicator, covered by a rubber seal.

2. Connect the charger to a wall socket. An animated battery icon in the left corner of the

display indicates that the battery is charging. The recharge duration (typically 4 ... 5 h)

depends on the charge level of the battery.

A new battery takes approximately 3 charging cycles to reach its maximum

capacity.

Do not store the batteries empty. Empty batteries may not charge after an

extended storage period.

To keep the rechargeable MI70 battery in good working condition, recharge

MI70 monthly if the indicator is not in use.

DM70 Quick Guide M212551EN-A

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