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6

Measuring Relative Humidity with the  

Microscanner

 D501

A unique benefit of the Microscanner

 D501 is its ability to measure wet  

and dry bulb tem peratures faster and more accurately than ever before.

A Relative Humidity Kit is available as an accessory. Contact Industrial Sales 
Customer Support for more information. This kit is comprised of a calculator 
card and a tube of water. The calculator card incorporates two circular 
membranes, an RH calculator and a Dew Point calculator.

The Microscanner

 is used to measure the wet bulb and dry bulb 

temperatures of the atmo sphere. From these two temperatures, both the 
relative humidity and the dew point can be calculated.

To calculate Relative Humidity:

1.  Wet the absorbent membrane identified as WET with a few drops of water 

(a small tube of tap water is provided with the kit).

2.  Rapidly wave the card in the air for several seconds. This assures that the 

water on the wet membrane is evaporating at its maximum rate.

3.  With the Microscanner

 in the MIN mode, quickly measure the 

temperature of the WET membrane immediately after you stop waving it. 
This is the atmosphere’s wet bulb temperature.

4.  Set the Microscanner

 in the SCAN mode and measure the DRY spot. 

This is the atmo sphere’s dry bulb temperature.

5.  Use the calculator card as directed to com pute the relative humidity and 

dew point.

Fahrenheit to Celsius Conversion

The D501 Microscanners

 are equipped with a convenient method for 

Fahrenheit/Celsius conversion:
1.  Find the small hole on the left side of the red display filter.
2.  Insert the end of a straightened paper clip into the hole and push to 

activate the small switch underneath.

3.  While holding the paper clip pressed into the switch, turn the instrument on 

by pressing the red POWER ON button.

4.  Remove the paper clip.
5.  The instrument now reads °C instead of °F. To return to the original 

setting, simply repeat the process. Each time you repeat the process, the 
instrument switches between °F and °C.

Содержание Microscanner D501

Страница 1: ...Instruction Manual Microscanner D Series D501 RS D501 High Performance Models...

Страница 2: ...our high performance Microscanner D Series features Full range resolution to 0 1 F or C SCAN MAX and MIN modes of operation A 10 second display lock An audible beeper to signal functional or condition...

Страница 3: ...initiate a new set of readings PUSH the power pushbutton at any time Operation Mode SCAN In the SCAN mode the target s instantaneous temperature is continuously displayed and updates 10 times per seco...

Страница 4: ...vides a marker with each unit It is only necessary to mark an area slightly larger than your Microscanner s nosepiece In the MAX or MIN mode you may want to check several points over an area In this c...

Страница 5: ...pment If electrical inspection is of particular importance contact Exergen for more informa tion relative to the dedicated electrical inspection instruments If the surface is metallic be sure to mark...

Страница 6: ...nose piece Although this will not harm the unit the indicated temperature may be a few degrees too high If this happens allow a few minutes between readings for the nosepiece to cool down and stabili...

Страница 7: ...a scan is indicated by the audible beeper Once a hot spot or cold spot is identified the exact temperature of that spot can be measured by touching the surface as previously ex plained When using the...

Страница 8: ...s This assures that the water on the wet membrane is evaporating at its maximum rate 3 With the Microscanner in the MIN mode quickly measure the temperature of the WET membrane immediately after you s...

Страница 9: ...p each second Temperatures will continue to be displayed as long as accuracy can be assured If the battery drops below 5 7 volts the battery is considered dead and the display defaults to If a problem...

Страница 10: ...ar ent material The shiny metal will reflect the transparent materi al s heat back to the Microscanner Wet or icy surfaces may interfere with the Microscanner s readings Water and other liquids are go...

Страница 11: ...nance required is to keep the sensor window clean This window located at the base of the nosepiece s reflective cup is made of a special crystal which passes infrared heat Dirt greasy films or moistur...

Страница 12: ...sure If after applying all of the above solutions the instrument s accuracy is still in question contact Exergen for further directions Warranty Exergen warrants the Microscanner D Series to be free o...

Страница 13: ...mm Repeatability 02 of absolute temperature Display Resolution 0 1 F or 0 1 C Display Update 10 times second Response Time Constant 60 mSec Field of View 1 1 53 degrees Spectral Sensitivity 2 to 20 mi...

Страница 14: ...Sensor Window Model D501 Nosepiece with Reflective Cup AECS Mode Selector Switch On Off Power Pushbutton High impact ABS Case Digital LED Display Microscanner D Series Features Overview...

Страница 15: ...Remote Sensor Probe Model D501 RS Microscanner D Series Features Overview...

Страница 16: ...Exergen Corporation 400 Pleasant Street Watertown MA 02472 U S A 617 923 9900 www exergen com 818098 Rev 3 Microscanner D Series...

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