DeFelsko PosiTector DPM User manual
Full Guide v. 3.3
PosiTector
®
DPM
Dew Point Meter
Table of Contents
Table of Contents
Introduction ......................................................... 1
Quick Start .......................................................... 1
Operation Overview ............................................ 3
Calibration ........................................................... 5
Why is Measurement Important .......................... 6
Probes ................................................................. 7
Menu Operation .................................................. 9
Alarm Mode ......................................................... 9
Setup Menu ......................................................... 11
Reset .............................................................. 11
Gage Info ....................................................... 12
Wet Bulb Temperature ................................... 12
Anemometer .................................................. 12
Trend Chart .................................................... 12
Memory Management ......................................... 14
Standard Models ........................................... 14
Advanced Models .......................................... 14
Annotate ......................................................... 16
Display ........................................................... 16
Summaries ..................................................... 17
Screen Capture .............................................. 17
Auto Log Mode .................................................... 17
Accessing Stored Measurement Data ................ 19
PosiSoft Desktop Manager (PDM) ................. 19
PosiSoft.net .................................................... 19
PosiSoft Software .......................................... 19
PosiTector App. .............................................. 19
Connect Menu ..................................................... 20
WiFi......... ....................................................... 20
Access Point................................................... 20
USB.......... ...................................................... 22
USB Serial Streaming..................................... 23
Sync.net Now.................................................. 24
Bluetooth Smart................ ............................. 24
Bluetooth......................................................... 25
Updates .......................................................... 26
Power Supply / Battery Indicator ........................ 26
Troubleshooting .................................................. 27
Technical Data .................................................... 28
Returning For Service ......................................... 29
Warranty .............................................................. 29
1
Introduction
Introduction
The PosiTector Dew Point Meter (DPM) is a hand-held,
electronic Gage that continually measures, calculates, and
records climatic conditions quickly and accurately. It consists of a
body (Standard or Advanced) and probe (page 7).
The PosiTector DPM powers-up when the center navigation
button is pressed. Readings are updated automatically each
second. To preserve battery life, the Gage powers down after
approximately 5 minutes of no activity. All settings are retained.
Quick Start
Quick Start
1. Remove the protective rubber cap from the surface
temperature sensor.
2. Power-up Gage by pressing the center navigation button.
USB Port
LCD Display
Probe
PosiTector body
2
RH - Relative Humidity (measured)
Ta - Air Temperature (measured)
Ts - Surface Temperature (measured)
Td - Dew Point (calculated)
Ts-Td - Surface minus Dew Point
Temperature (calculated)
Tw - Wet Bulb Temperature (calculated)
(Advanced Models Only)
V- Wind Velocity (DPM-A model only)
Typical Screen
Wrist Strap
We recommend attaching and
wearing the supplied wrist strap.
1
2
Protective Lens Shield
The LCD is covered with a thin plastic film for protection against
fingerprints and other marks during shipment. This film, while
usually removed before using the Gage, can be left in place to
protect against paint overspray or debris. Replacements can be
purchased.
Protective Cap
The PosiTector DPM is shipped with a protective plastic cap over
the surface temperature sensor. Remove this cap prior to use.
Replace it when the Gage is not in use to protect the sensor.
DPM-D probes only display RH, Ta, & Td
NOTE:
3
RH - The relative humidity sensor is located inside the probe
housing. The sensor may require a longer period to stabilize in the
event of extreme humidity changes.
Ta- The air temperature sensor is also located inside the probe
housing. (Also known as Dry Bulb Temperature)
Ts- A surface temperature thermocouple is located on the tip of
the probe (built-in probe model). It is spring loaded and designed
to quickly self-align on a surface. Press it against a surface and
allow a few seconds for the value to stabilize. Do not drag the sen-
sor over the surface. Wet the surface for a faster response. Cover
with the included protective plastic cap when not in use.
Does not apply to DPM-D models
Operation Overview
Operation Overview
The PosiTector DPM powers-up when the center navigation
button is pressed. Readings are updated automatically each
second. To preserve battery life, the Gage powers down after
approximately 5 minutes of no button activity. All settings are
retained.
Button Functions- Normal Operation
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.
Scroll through
Trend Charts
(Advanced only)
Access the Menu
Pause / Resume
Restore brightness
after dimming
(Advanced only)
NOTE:
4
Td - The dew point temperature is a function of air temperature
and relative humidity (see ISO 8502-4 Annex A). It is the temper-
ature to which a volume of air must be cooled in order to reach
saturation.
Ts- Td- The surface minus dew point temperature is important
in judging the risk of condensation, or dew, forming on a surface.
For example, ISO 8502-4 recommends that, unless otherwise
agreed, the temperature of a steel surface generally should be at
least 3°C (5°F) above the dew point when protective coatings are
applied.
Does not apply to DPM-D models
NOTE:
Tw- (Advanced models only) The wet bulb temperature is the
temperature of adiabatic saturation. This is the temperature
indicated by a moistened thermometer bulb exposed to air flow.
The wet bulb temperature is calculated from Ta and RH using an
air pressure of 1.0 atmospheres (1013mbar). It approximates the
temperature indicated by a moistened thermometer bulb exposed
to airflow. Variations of Tw at other pressures could be greater than
±1°C (±2°F).
V - Wind velocity is measured with a hot-wire anemometer located
inside the aluminum housing (DPM-A models only)
The Gage may require a period of time before the above climatic
readings stabilize. This is most noticeable when the Gage is
relocated from one extreme environment to another (i.e. from a
warm location to a cold location). A period of up to 30 minutes
should provide adequate time for stabilization.
For surface temperature measurement on steel over an
extended of time, consider using the optional Magnetic Surface
Temperature probe (pg. 7).
NOTE:
Smart TrendTM Indicators - identify rising, falling or stable
readings. The Gage compares each measurement with recent
values to provide the current direction of change.
5
Smart Trend
Indicators
While the absence of an arrow does not necessarily signify
stability, it can be taken to mean that particular reading is
undergoing little or no change. Slow changes could therefore
occur without being noted by an indicator arrow.
Calibration
Calibration is the controlled and documented process of
measuring traceable calibration standards and verifying that the
results are within the stated accuracy of the Gage. Calibrations
are typically performed by the Gage manufacturer or by a certified
calibration laboratory in a controlled environment using a
documented process.
The PosiTector DPM is shipped with a Certificate of Calibration
showing traceability to a national standard. For organizations with
re-certification requirements, the PosiTector DPM may be
returned at regular intervals for calibration. DeFelsko
recommends that our customers establish Gage calibration
intervals based upon their own experience and work environment.
Based on our product knowledge, data and customer feedback, a
one year calibration interval from either the date of calibration,
date of purchase, or date of receipt is a typical starting point.
Written Calibration Procedures are available online at no charge
at www.defelsko.com.
6
Why is Measurement Important?
Why is Measurement Important?
For industrial painters, the primary reason for measuring climatic
conditions is to avoid rework and the premature failure of
protective coatings. Recommendations and requirements are
covered under various internationally recognized standards.
Temperature – It is important to measure both surface and air
temperatures as they are often different. Application at incorrect
temperatures can cause defects including: blistering, pinholing,
cratering, dry spray & mud cracking. By measuring surface
temperature it is possible to avoid potential application problems if
air or surface temperatures become too hot or too cold for
satisfactory film formation. Surface and air temperatures directly
affect the rate of cure of the applied coating or lining system and
are major factors in the formation of surface moisture or dew.
ASTM D3276 Standard Guide for Painting Inspectors (Metal
Substrates) states that the minimum air/surface temperature is
usually 5ºC (40ºF).
Relative Humidity - the amount of moisture in the air expressed
as a percent of overall volume. High relative humidity can retard
the rate of solvent evaporation. For this reason, the maximum
relative humidity at which coatings or linings can be applied and
cured is generally set at 85%. This can be set as an alarm in the
Advanced model.
Dew Point Temperature - the temperature at which moisture will
begin to form on a surface. The dew point temperature is a function
of air temperature and the relative humidity. (see ISO 8502-4
Annex A). It is the temperature to which a volume of air must be
cooled in order to reach saturation. A number of major standards
organizations call for careful dew point control. Moisture on a
freshly blasted steel substrate will cause the steel to rust. If a thin,
invisible film of moisture is trapped between the applied coating
and the substrate, the system will likely fail prematurely. To ensure
that dew point problems do not exist, ISO 8502-4 and SSPC
guidelines state that the surface temperature must be a minimum
of 3ºC or 5ºF above the dew point during the 3 critical phases of
coating preparation, application, and cure.
7
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 power-down 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, shore hardness
durometer, salt contamination and ultrasonic wall
thickness probes. See www.defelsko.com/probes
Probes
Probes
PosiTector DPM probes:
PosiTector DPM
Integral Surface Temperature Sensor
PosiTector DPM-S
Magnetic Surface Temperature Sensor
PosiTector DPM-A Anemometer
Integral Surface Temperature Sensor
PosiTector DPM-D
Cabled probe with NPT threads
K-Type
Connector
Surface
Temperature
Wind
Velocity
Air Temperature &
Relative Humidity
Surface
Temperature
Surface
Temperature
Probe also accepts other K-Type
thermocouple sensors (optional)
1/2” NPT
Threads
Sintered Metal Tip
(protects sensor)
Air Temperature &
Relative Humidity
Air Temperature &
Relative Humidity
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