DeFelsko DPMIR1, DPMIR3, DPMA1, DPMD3, DPMD1 User manual

PosiTector

Dew Point Meter

Instruction Manual

®

DPM

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Introduction

Introduction

The PosiTector Dew Point Meter (DPM) is a hand-held,
electronic instrument that measures, calculates and records
climatic conditions, quickly, and accurately. It consists of a body
(Standard or Advanced) and probe (pg. 3).

Quick Start

Press the button to power up the Gage. To conserve battery
life, the gage will automatically go to sleep after 5 minutes of
inactivity. While in Sleep Mode, the gage powers up significantly
faster— convenient when moving between parts or locations. The
gage will completely power off after 4 hours of inactivity.
Alternatively, select Power Off from the main menu. All settings
are retained.

1.Remove the protective rubber cap from the probe.

2.Power-up Gage by pressing the center navigation button.

A typical instrument screen is shown below, consisting of RH, Ta,
Ts, Td, and Ts-Td readings. This group of readings is referred to as
a dataset.

- Relative Humidity (measured)

RH

- Air Temperature (measured)

Ta

- Surface Temperature (measured)

Ts

- Dew Point (calculated)

Td

- Surface

Ts-Td

Temperature (calculated)

- Wet Bulb Temperature (calculated)

Tw

(

Advanced models only)

V - Wind Velocity (DPM A

minus

Dew Point

model only

)

1

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Button Functions- Normal Operation

Scroll through Trend
Charts (Advanced only)

Access the Menu

The Pause/Resume button stops values from automatically
updating to allow for closer examination of the relationship
between the values or to allow time to manually record the entire
dataset. Press again to resume.

Pause / Resume

Restore brightness
after dimming

Menu Operation

To access the Menu, power-up the gage, then press the center
navigation button . Either the keypad or touch screen can be
used to navigate the menu. If desired, touch screen functionality
can be disabled within the Setup menu (See Touch, pg. 5).

Select a menu option by touching it, or use the and but­tons to highlight the desired option and press to select it.

On menus longer than one page, the current page number is dis­played below the menu name. Navigate between pages using

when the first menu item is selected, or when the last

menu item is selected. If using touch, navigate between pages
Press the button or swipe right to return to a previous screen.
by touching or , or by swiping up or down.
Select Exit to close the Menu.

When a Menu option is highlighted, the
icon indicates on-gage help is available.
Press or touch the icon to display the
help.

NOTE:

Update your gage to ensure that you

have the latest on-gage help information.

indicates that a sub-menu exists for the
Menu option. Select the option to display its
sub menu.

2

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Probes

Probes

When powered-up, the PosiTector automatically
determines which probe is attached and does a
self-check.

To disconnect a probe from a body, slide the plastic
probe connector horizontally (in the direction of the
arrow) away from the body. Reverse these steps to
attach a different probe. It is not necessary to power­down the Gage when switching probes.

The PosiTector body accepts a wide variety of probe types
including magnetic, eddy current, and ultrasonic coating thickness,
surface profile, hardness, salt contamination and ultrasonic wall
thickness probes.

PosiTector DPM probes:

PosiTector DPM / DPM IR

Integral Surface Temperature Sensor

Air Temperature &

Relative Humidity

K-Type

Surface

Temperature / IR

Sensor

Connector

PosiTector DPM A Anemometer

Integral Surface Temperature Sensor

PosiTector DPM S

Magnetic Surface Temperature Sensor

Surface

Temperature

Probe also accepts other K-Type

thermocouple sensors (optional)

PosiTector DPM D

Cabled probe with NPT threads

1/2” NPT

Threads

Air Temperature &

Relative Humidity

Air Temperature &

Relative Humidity

Sintered Metal Tip

(protects sensor)

Surface

Temperature

Wind

Velocity

3

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Alarm Mode

Alarm Mode

Alarm

The PosiTector DPM can automatically alert the user when
current climatic conditions exceed pre-set values. When selected,
the Alarm icon is displayed at the the top of the screen.

Standard models will alert the user when the surface temperature
is less than 3°C (5°F) above the dew point temperature. Enable by
selecting the tick box.

Advanced models

conditions for each reading in a dataset. When connected to WiFi,
Advanced models can also send alerts via email.

Units

Converts the displayed units for temperature and wind velocity.

Temperature (all models): Celsius (°C) or Fahrenheit (°F)

Velocity (DPM A only): m/s, ft/s, km/h, mph, or kn.

Reset

Reset (menu reset) restores factory settings and returns the Gage

to a known condition. The following occurs:

- All batches and stored datasets, batch names and screen
captures are erased.

- Menu settings are returned to the following:

Memory = OFF
Auto Log = OFF
Trend Chart = None
Auto Dim = ON
Display = None

Perform a more thorough Hard Reset as follows:

1. Power down the Gage and wait 5 seconds.

2. Simultaneously press and hold the and buttons

until the Reset symbol appears.

This returns the Gage to a known, “out-of-the-box” condition.

allow the user to set up custom alarm

Setup Menu

Setup Menu

Bluetooth & Stream = OFF
WiFi & Access Point = OFF
USB Keyboard & Stream = OFF
BLE Keyboard = OFF
Anemometer = ON

4

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

It performs the same function as a menu Reset with the addition of:

- Bluetooth Pairing info is cleared.

- Alarm settings are set to defaults.

- Menu settings are returned to the following:

Units (temperature) = Celsius
Flip Lock = OFF
Auto Sync .net = ON
Alarms = OFF
Alarm Sound = OFF
Sound = Medium
Language = English
Touch = ON

Units (velocity) = m/s
Battery Type = Alkaline
Backlight = Normal
Bluetooth Smart = OFF
USB Drive= ON
Auto Log Interval = 5 min
Wet Bulb = OFF

NOTE:

Date, Time and WiFi settings are not affected by either Reset.

Trend Chart

(Advanced models only)

Displays a real-time graph of the readings over the last three
minutes. Use Trend Charts to monitor short-term environmental
changes and spot trends.

Shortcut:

Press the button to scroll through the trend charts.

Wet Bulb

(Advanced models only)

When selected, the wet bulb temperature (Tw) is displayed on the
main screen. It is calculated from Ta and RH using an air pressure
of 1.0 atmospheres (1013 mbar). Variations of Tw at other
pressures could be greater than ±1°C (±2°F).

Sound

Adjusts the volume of built-in speaker (Off, Low, Medium, High).

Flip Lock

Disables the Auto Rotate feature by locking the display in its
current orientation.

Touch

Allows the touch screen functionality to be disabled. All gage
functions can also be controlled using the navigation buttons.

5

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Set Clock

All measurements are date and time stamped (24-hour format)
when stored into memory. It is therefore important to set the
correct date and time. Use the and buttons to select a
value, and the and buttons to adjust it. The current date
and time setting can also be viewed at the top of the main menu.

Battery Type

Selects the type of batteries used in the Gage from a choice of
“Alkaline”, “Lithium” or “NiMH” (nickel-metal hydride rechargeable).
The battery state indicator symbol is calibrated for the selected
battery type. No damage will occur if the battery type used in the
Gage does not match the selected battery type.

Anemometer

(PosiTector DPM-A probes only)

When Enabled , the PosiTector DPM A
will display wind velocity (v) in the selected
unit of measure (see Units pg. 4).

Air Temperature &

Relative Humidity

Hot Wire Anemometer

Slide cover down to

expose hot wire

anemometer

Surface Temperature

NOTE:

Dew point (Td) and surface temperature (Ts) are not
displayed when the Anemometer is enabled.

6

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Emissivity

Sets the emissivity ratio for the PosiTector DPM IR infrared
temperature sensor.

Select from a User Entered Value or one of the following preset
options:

- Aluminum (rough) = 0.07 - Plastics = 0.94

- Zinc (Galvanized) = 0.25 - Steel (Oxidized) = 0.95

- Concrete = 0.54 - Wood = 0.95

- Paint = 0.96

The PosiTector DPM has internal memory storage for recording
measurement datasets. Stored datasets can be reviewed on­screen or accessed via computers, tablets and smart phones.
Datasets are date and time-stamped. Datasets can be stored
manually (using the button), or automatically using the Auto Log
mode.

The symbol appears when the Gage is set to store datasets.

Standard models
Advanced models

“New Batch” closes any open batch and creates a new batch name
using the lowest available number. New batch names are date
stamped when they are created.

(PosiTector DPM-IR Models Only)

Memory Management

Memory Management

store up to 2,500 datasets in one batch.

store 250,000 datasets in up to 1,000 batches.

Scroll through display
modes (Advanced only)

Delete last reading

Access the Menu

Screen Capture

Press both and buttons simultaneously to save an image of
the current display. The last 100 screen captures are stored in
memory and can be accessed when connected to a computer
(see PosiSoft USB Drive pg. 9).

Store a dataset
into memory

Restore brightness
after dimming

7

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Auto Log Mode

Auto Log Mode

The PosiTector DPM can automatically display and record
datasets at user selected time intervals. When selected, the Auto
Log icon will appear on the display, with a countdown timer until
the next reading. Connect the instrument to a USB power source
for long-term use.

Scroll through

display modes

Turn on instrument/

Cancel Auto Log

mode

(Advanced only)

Standard

instrument will take readings for 50-60 hours on a set of alkaline
batteries, depending on the frequency of measurements.

Advanced

batteries. At each interval, the instrument will wake up, take a
reading, sync to PosiSoft.net (if configured) and power down. The
instrument can record approximately 10,000 datasets while in this
mode using alkaline batteries, and can be configured to Auto
Batch at daily, weekly, and monthly intervals.

NOTES:

-Auto Log continues recording until the instrument loses power or
the user turns off Auto Log mode. Stored datasets will remain in
memory until full, then the oldest dataset or batch will be overwrit­ten to allow space for the next dataset.

-To conserve battery life, readings update only at the Log Interval.

-It is recommended that fresh alkaline batteries be installed prior

models remain powered-up while in auto log mode. The

models

The last recorded readings will remain on the display until the
next dataset has been stored.

to an extended Auto Log if not connected to continuous power.

power down between readings to conserve

8

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Accessing Stored Measurement Data

DeFelsko offers the following free solutions for viewing, analyzing
and reporting data:

PosiSoft USB Drive - Connect the Gage to a PC/Mac using the
supplied USB-C cable. View and print readings and graphs using
universal PC/Mac web browsers or file explorers. No software or
internet connection required.

PosiSoft Desktop - Powerful desktop software (PC/Mac) for
downloading, viewing, printing and storing measurement data.
Includes a customizable, templated PDF Report Generator. No
internet connection required.

PosiSoft.net - Web-based application offering secure, centralized
storage of measurement data. Access your data from any web­connected device.

PosiTector App - (
and Android smart devices. Permits users to create, save and
share professional PDF reports. Add images and notes using the
smart device’s camera and keyboard.

WiFi

Allows connection to your local wireless network or mobile
hot spot. Ideal for using your network’s internet connection for
synchronizing stored measurements with PosiSoft.net (above).

Advanced models only) App for compatible iOS

Connect Menu

(Advanced models only)

USB

When USB Drive is enabled , the PosiTector uses a USB
mass storage device class which provides users with a simple
interface to retrieve stored data in a manner similar to USB flash
drives and digital cameras. USB Drive is also required to import
stored measurements into PosiSoft Desktop software (above).

9

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

NOTE:

USB-C cable. The batteries are not used and the body will not
automatically power down.

While connected, power is supplied through the included

Keyboard

When enabled and connected to a computer, the PosiTector will be
recognized as a Keyboard. Readings are sent to the computer as
they are taken, emulating keystrokes, followed by a carriage return.

Stream individual readings to a USB connected computer via a
serial protocol. Ideal for use with serial compatible SPC data
collection software.

NOTE:

Sync .net Now

The above WiFi and USB menus contain a Sync .net Now
option. When selected, the Gage immediately synchronizes
stored measurement data via its respective communication
method (internet connection required). Alternatively, select Auto
Sync .net from within the USB connect menu to automatically
synchroniz e upon connection to a PC. Additional measurements
added to memory while connected are synchronized only when
the USB cable is disconnected and reconnected, or when the
Sync.net Now option is selected. WiFi connected gages
automatically attempt synchronization upon power-up.

NOTE:

synchronize measurements with PosiSoft.net.

PosiSoft Desktop is required when using USB to

Bluetooth

(Advanced models only)

(Advanced models only)

(Advanced models only)

(Advanced models only)

Allows communication with a smart device running the
PosiTector App (pg. 9) via auto-pairing Bluetooth Smart (BLE)
wireless technology.

10

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Sync Batches

Select batches to flag them for synchronization to the PosiTector
App. Sync Batches is useful when connecting a new device to a
gage with pre-existing batches, since only batches created while
Bluetooth Smart is enabled are automatically selected.

Selected batches are synchronized when the next reading is
taken in a batch flagged for synchronization, or when the Sync
Batches option is selected at the bottom of the list of selected
batches.

NOTE:

from batches selected in the Sync Batches menu are held in a
queue until communication with the PosiTector App is re­established.

Transfers selected batches to the PosiTector App. Send Batches
is useful when switching between devices, as only readings and
batches that have yet to be synchronized with any smart device
are synchronized automatically.

The Send Batches option is visible in the menu when the Gage
is connected to a smart device running the PosiTector App.

When enabled and connected to a computer, the PosiTector will
be recognized as a wireless Keyboard. Readings are sent to the
computer as they are taken, emulating keystrokes, followed by a
carriage return.

If Bluetooth Smart is disabled or disconnected, data

Send Batches

BLE Keyboard

(Advanced models only)

WARNING:

an update. All stored measurements will be erased from memory.

The Gage will perform a Hard Reset (pg. 4) after

11

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Technical Data

Technical Data

Conforms to: ISO 8502-4, BS7079-B and ASTM D3276

Operating Range: -40° C to +80° C -40° F to +175° F

PosiTector DPM, DPM S, DPM A, DPM D, DPM IR

Range Accuracy Resolution

-40° to 80° C

Surface

Temp.

IR Surface

Temp.**

Air

Temp.

Humidity 0 to 100% ±3 % 0.1 %

Wind Speed*

*DPM A Models Only
**DPM IR Models Only
***At Ta = 23° C

PosiTector DPM IR:

- Distance to Target Size Ratio (D:S) – 4:1

- Response Time: <500 milliseconds (95% response)

- Spectral Response: 5.5 - 14 µm

80° to 190° C

-40° to 175° F

175° to 375° F

-70° to 380° C

-94° to 716° F

-40° to 80° C

-40° to 175° F

0 - 20 m/s

0 - 65 ft/s

0 - 3900 fpm,

0 - 72 km/h

0 - 44 mph

0 - 38 kn

±0.5° C
±1.5° C

±1° F
±3° F

±1° C +

(0.01°C/°C)***

±2° F +

(0.01°F/°F)***

±0.5° C

±1° F

±3%

Full Scale

+ least

significant

digit

0.1 m/s

0.1 km/h

0.1 mph

12

0.1° C

0.1° C

0.1° F

0.1° F

0.1° C

0.1° F

0.1° C

0.1° F

0.1 ft/s
1 fpm,

0.1 kn

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

CAUTION:

To ensure optimal performance of your PosiTector DPM, do not
obstruct the airflow near the air temperature and humidity sensors.
Keep fingers away from the sensor, as body heat can cause
incorrect readings. Allow time for the instrument to acclimate and
for the readings to stabilize when moving the instrument between
different environments.

When using the surface temperature probe, do not use excessive
downward force, and do not drag it sideways. When the instrument
is not in use, place the rubber cap over the surface temperature
sensor to prevent damage.

13

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com

Returning for Service

Before returning the instrument for service…

1. Install new or newly recharged batteries in the proper
alignment as shown within battery compartment.

2. Examine the surface temperature sensor for dirt or damage.

3. If the humidity sensor is slow to respond or reading erratically,

recondition the sensor by removing the probe from the gage
body and wrapping it in a damp cloth overnight.

4. Perform a Hard Reset (pg. 4).

5. If issue is not resolved, Update (pg. 11) your PosiTector gage

body and re-attempt measurements.

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com