Dwyer Instruments Mark II 40 Series Manual de usuario

  

 



 

-L2

" -

 

 t 



 

 



       

      

       

    

    

      

    

     

 

     

     



     



   

        

     

     

    

 

   

       



 

      

     

   I





 



 



 



 





    

 

 



Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

Static ressure Indicator: Using the 1/8˝ NPT

tubing adapters provided, make a static pressure

connection to the duct at the desired location.

Using either the tubing provided or a longer

length if necessary, connect the pressure sensor

to either the high (left) or low (right) pressure

connection of the gage, depending on whether

the static pressure is positive or negative

compared to atmosphere. Where air velocities in

the duct are 1000 ft. per minute or higher, static

pressure error may be induced unless a static

pressure tip is used.

Air Filter Gage: Mount the gage within 4-1/2˝ of

the filter bank and install a 1/8˝ NPT tubing

adapter in the duct on each side of the filter

element. Run the tube from the fitting on the

discharge side of the filter to the low pressure

(right) gage connection and the tube from the

upstream side of the filter to the high pressure

(left) connection. Remove the paper backing

from the green and red arrows and install the

arrows on the face of the manometer adjacent to

the indicating tube to indicate clean and dirty filter

readings.

Air Velocity Indicator: A pitot tube is required for

air velocity readings and care must be taken in

installations to insure accuracy. Select a location

for the pitot tube with smooth straight sections of

duct at least 8-1/2 diameters upstream and 1-1/2

or more diameters downstream. Install the pitot

tube so it is centered in the duct with the tip

directed into the air stream. The right angle pitot

tube connection is connected to the low pressure

(right) gage connection. The straight pitot tube

connection is connected to the high pressure

(left) gage connection. Velocity reading now

indicated on the gage is the center or maximum

air velocity in the duct. For average velocity

across the full area of the duct, multiply by a

factor of .9. The velocity indicated is for dry air at

70°F (21.1°C), 29.9˝ barometric pressure, and a

resulting density of .075 pounds per cubic foot.

For variations from these standard conditions,

corrections may be based upon the following

formula:

Air Velocity (FPM) = 1096.7

Where Pv = velocity pressure in in./H

D = air density in lbs. per ft

D = 1.325 x

Where Pb = barometric pressure in inches of

mercury

T = absolute temperature (indicated °F

+ 460)

To determine the volume of air flow in the duct in

cubic feet per minute, multiply air velocity in FPM

times the cross-sectional area of the duct in

square feet.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

DWYER INSTRUMENTS, INC.

.O. BOX 373

MICHIGAN CITY, INDIANA 46360, U.S.A

Model

40-1

40-1-AV*

41-2

41-2-AV*

40-250 a

40-250-AV*

41-600 a

40-25 mm

41-60 mm

Range

.10-0-1.00˝ w.c.

0-1.10˝ w.c.

0-4200 fpm

.20-0-2.400˝ w.c.

0-2.50˝ w.c.

0-6300 fpm

10-250 Pa

0-260 Pa

0-21 mps

20-0-600 Pa

0-26 mm w.c.

0-60 mm w.c.

Minor Grades

.01˝ w.c.

varies

.02˝ w.c.

varies

2 Pa

varies

5 Pa

2 mm w.c.

5 mm w.c.

Indicating Fluid

.826 sp. gr.

(red fluid)

.826 sp. gr.

(red fluid)

1.910 sp. gr.

(blue fluid)

1.910 sp. gr.

(blue fluid)

.826 sp. gr.

(red fluid)

.826 sp. gr.

(red fluid)

1.910 sp. gr.

(blue fluid)

.826 sp. gr.

(red fluid)

1.910 sp. gr.

(blue fluid)

O ERATING RANGES

* Pitot tube required at additional cost.

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