DeFelsko PosiTector DPM Manuale utente

PosiTector DPM

Instruction Manual v. 3.1

Dew Point Meter

Table of Contents

Introduction......................................................... 2

Operation Overview............................................ 3

Probes ............................................................... 7

Menu Operation.................................................. 9

Alarm Mode................................................... 10

Setup Menu................................................... 11

Memory Management.................................... 14

Auto Log Mode.............................................. 17

Connecting to a Computer................................. 18

Power Supply / Battery Indicator........................ 24

Returning For Service......................................... 24

Troubleshooting ................................................. 25

Technical Data ................................................... 26

Introduction

The PosiTector Dew Point Meter (DPM) is a hand-held,

electronic instrument that continually measures, calculates and

records climatic readings, quickly and accurately. It consists of a

body (Standard or Advanced) and probe (Built-In or Separate).

A typical instrument screen is shown (pg. 3), consisting of RH, Ta,

Ts, Td, and Ts-Td readings. This group of readings is referred to

as a dataset.

PosiTector DPM Kit Contents

- Humidity, air and surface temperature sensors (pg. 7)

- Protective rubber holster with belt clip

- Protective Cap for Surface Temperature Sensor (pg. 2)

- Protective Lens Shield (pg. 2)

- Wrist strap (pg. 2)

- 3 Alkaline AAA batteries (pg. 24)

- Quick Guide Instructions

- Nylon carrying case with shoulder strap

- USB Cable (pg. 18)

- Certificate of Calibration traceable to NIST (pg. 5)

- Two (2) year warranty on Body and Probe

Wrist Strap

We recommend attaching and wearing the

supplied wrist strap.

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 instrument is not in use to protect the sensor.

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 instrument, can be left in place

to protect against paint overspray. Replacements can be

purchased.

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)

Typical Screen

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 instrument 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.

RH - The relative humidity sensor is located inside the white plas-

tic 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 white

plastic housing. (Also known as Dry Bulb Temperature)

Ts- A surface temperature thermocouple is located on the tip of

the silver probe (built-in probe model). It is spring loaded and

designed to quickly self-align on a surface. Press it against a

Scroll through

Trend Charts

(Advanced only)

Access the Menu

Pause / Resume

Restore brightness

after dimming

(Advanced only)

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.

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).

Tw can only be displayed with memory off and its value

cannot be stored in memory.

NOTE:

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 paints are applied.

The instrument may require a period of time before the above

climatic readings stabilize. This is most noticeable when the

instrument 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.

surface and allow a few seconds for the value to stabilize. Do not

drag the sensor over the surface. Wet the surface for a faster

response. Cover with the included protective plastic cap when not

in use.

For surface temperature measurement on steel over an

extended of time, consider using the optional Magnetic Surface

Temperature probe (pg. 8).

NOTE:

Smart Trend

Indicators

While the absence of an arrow does not necessarily signify stabil-

ity, it can be taken to mean that particular reading is undergoing lit-

tle 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.

Smart TrendTM Indicators - identify rising, falling or stable

readings. The instrument compares each measurement with

recent values to provide the current direction of change.

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.

The PosiTector DPM consists of a body and a probe. Two probe

models (Built-In and Separate) are offered, as pictured below. All

bodies accept all probes. See Info (pg. 11) to find your body and

probe type. More information is available at:

www.defelsko.com/dewmeter.htm

To disconnect a probe from a body, power-down the

instrument and pull the plastic probe connector

horizontally (in the direction of the arrow) away from the

body. Reverse these steps to attach a new probe.

When powered-up the PosiTector automatically

determines what type of probe is attached and does a

self-check.

Probes

Air temperature

and humidity

sensors

Separate probe

with magnetic

surface

temperature

sensor

Optionally, the Magnetic Surface Temperature Probe can be dis-

connected from the K-Type thermocouple connector (separate

probe models only) and replaced with one of the following acces-

sories:

Hand-held Surface Temperature Probe

-for spot checking hard-to-reach surfaces

Self-adhering Surface Temperature Probe

-sticks to solid materials including aluminum, wood, concrete,

etc. Ideal for unattended monitoring.

Liquid Temperature Probe

-general purpose probe with stainless steel shaft

Surface

temperature

sensor

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 incor-

rect 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 plastic cap over the surface temperature

sensor to prevent damage.

The PosiTector will accept a number of non-related

probes including coating thickness probes (PosiTector 6000) and

surface profile probes (PosiTector SPG). For best accuracy,

ensure your instrument has the latest software updates (pg. 22)

before measuring with a new probe. For the latest information

about probe interchangeability, visit www.defelsko.com/probes.

CAUTION:

NOTE:

Memory

Auto Log

Alarm

Setup

Connect

Help

Power Off

Exit

Sync Now

USB Drive

Auto SYNC

Bluetooth

Updates

Exit

Menu Operation

Instrument functions are menu controlled. To access the Menu,

power-up the instrument, then press the center navigation button.

Below is a sample menu for a PosiTector DPM Advanced Model:

Some buttons have a tick box to their

right to indicate current status. An empty

box indicates that feature is not active.

Current selection is displayed

with darkened background

Down

Center

To navigate, use the Up and Down buttons to

scroll and to SELECT.

Select Exit to exit from any menu.

Navigation Button

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