Dew Point Meter INSTRUCTION MANUAL v. 1.2 Simple. Durable. Accurate.
CONTENTS Introduction..............................................................................3 Calibration...............................................................................3 Power-up / Power-down..........................................................3 Instrument Features................................................................4 General Operation...................................................................4 Menu Operation.....................................................
Introduction The Dew Point Meter is a hand-held, electronic instrument that measures, calculates and records climatic parameters, quickly and accurately. An optional AC model includes a built-in AC port and matching power adapter. Typical Display Measured parameters are: Ta - Air Temperature RH - Relative Humidity Td - Dew Point Temperature Ts - Surface Temperature D - Surface minus Dew Point Temperature Calibration All instruments are shipped with a Certificate of Calibration.
Instrument Features General Operation The 5 values displayed on the LCD are measured and updated automatically each second. Ta - The air temperature sensor is located inside the white plastic portion of the probe tip. RH - The relative humidity sensor is also located inside the white plastic portion of the probe tip. Extreme humidity changes may require a longer period to stabilize.
Td - 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. Ts - A surface temperature thermocouple is located on the tip of the probe. It is spring loaded and designed to quickly selfalign on a surface. Press it firmly against a surface and allow a few seconds for the value to stabilize. Wet the surface for a faster response.
Menu Operation Gage Menu Press simultaneously for menu options. To navigate, press for NEXT, any time to exit any menu. for SELECT. Press both at When there are more menu buttons than can fit onto one screen, a scroll bar will appear. The dark area indicates what portion of the total menu you are currently viewing. Some buttons have an adjacent tick box to indicate current status.
Memory Menu Option The Dew Point Meter can record up to 1000 datasets, for on screen viewing, for printing to the optional IR printer, for printing to a serial printer, or for downloading to a personal computer using the optional PosiSoft software. A dataset is one set of each of the 5 readings: air temperature, surface temperature, % relative humidity, dew point temperature, and D ( Ts - Td ), and includes date and time stamp.
The icon is displayed and a countdown timer will appear on the top right of the LCD. Dataset number Countdown timer Memory icon Dataset recording will continue until the user turns OFF Auto Log or the batteries become weak. NOTE: When the Auto Log mode is ON and the batteries become very low, the icon will be displayed and the instrument will turn OFF Auto Log and power down. When the user turns the instrument back ON memory will still be on but Auto Log mode will be OFF.
Downloading Datasets Stored in Memory Datasets stored in the instrument’s memory can be downloaded to a computer using the RS232 serial communication cable supplied with our optional PosiSoft software (see Options, pg. 12). Existing communication software can be used providing it can capture data from a COM port. Select the PRINT menu button. Datasets are not erased from memory after downloading.
Setup Menu Option When SETUP is selected the following options are presented: RESET restores factory settings and returns the instrument to a known, out-of-the-box condition. It is handy when you want to “start all over”.
When the Alarm tick box is checked, the instrument will alert the user when the surface temperature is less than 3°C (5°F) above the dew point temperature. (according to ISO 8502-4, steel surfaces should generally be 3°C (5°F) above the dew point when painting) The instrument will alert the user with an audio tone and the LCD screen will reverse (see sample screen above) when conditions may be unsuitable for painting. This option enables the display to read upside down.
Optional Accessories The Dew Point Meter has two available accessories for downloading stored datasets. Contact your dealer for assistance in determining which is best for your requirements. PosiSoft® for Windows® analysis software PosiSoft® ver.2.8 or higher runs on Windowsbased PC computers using Microsoft Windows® 95 or higher version and having a COM port. PosiSoft 2.
This connection graphic is displayed on the instrument’s LCD when communicating with PosiSoft. If it remains on the LCD for more than 5 minutes and PosiSoft is not connected to the instrument, the instrument can be turned off by opening the battery door. Complete operating instructions can be accessed by first installing the software, starting the program, then selecting the HELP - POSISOFT HELP - DOWN LOADING menu option.
Troubleshooting When the surface temperature probe is not on a surface, Air Temperature and Surface Temperature appear to be different: Under normal conditions with the surface probe in air Ta and Ts should be within the combined tolerance of each sensor. (Typically 1°C) It is possible for the difference to be larger if the surface probe has recently been in contact with surfaces that are at a different temperature than air.
Why do the Surface Temperature and Air Temperature values differ when holding the probe in the air and away from a surface? The Ts sensor has a very quick response time. The Ta sensor has a slower reaction time and requires additional time to stabilize. This is most noticable when moving from one temperature extreme to another. Changing The Batteries As the batteries become weak the symbol will appear and begin flashing during measuring.
Warranty The manufacturer fully warrants its products against defects in workmanship or materials for a period of one year from date of purchase. In the event that an instrument is found to be defective, return the product with proof of purchase to your dealer, and the defective product will be repaired or replaced at the manufacturer's option. No responsibility is assumed for incidental or consequential damages. The warranty is voided if the Instrument has been opened.
