Dwyer Instruments Mark II 40 Manuale utente

Mark II - Model 40 Molded Plastic Manometers

Installation and Operating Instructions

Bulletin D-59

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 Fax: 219/872-9057 e-mail: info@dwyer-inst.com

MICHIGAN CITY, INDIANA 46361,U.S.A

15/64 [5.95] x 13/32 [10.32] MOUNTING SLOT

10-5/8 [269.88]

5-5/16

[134.95]

MAX

4-5/8

[117.48]

2-31/32

[75.41]

25/32

[19.84]

Ø15/64 [5.95] MOUNTING HOLE

1-1/4

[31.75]

2-1/4 [57.15]

MAX 4 [101.60]

Dwyer Mark II - Model 40 Molded

Plastic Manometers are ideally suited

for air velocity and air filter gage applica-

tions at minimal cost. These inclined

manometers provide linear calibration

and excellent resolution throughout their

ranges. They are capable of pressure

measurements above and below

atmospheric, as well as differential pres-

sure measurements.

INSTALLATION

Stationary Applications: Mount the

Mark II manometer on a convenient vertical

surface. The installation should not be

exposed to strong chlorine atmospheres or

solvents such as benzene, acetone, carbon

tetrachloride, etc. The instrument is suitable

for total internal pressures of up to 15 psi

(100 kPa) and ambient temperatures of

150°F (65°C). DO NOT EXCEED THESE

LIMITS. At the mounting location selected,

drill two 9/64˝diameter holes on a vertical

line spaced 2-31/32˝apart. Install the

gage with the self-tapping screws provided,

turning the screws down snug but not tight.

Adjust the position of the gage until the bub-

ble is centered in the spirit level. Tighten the

mounting screws, checking to be sure the

instrument remained level, and re-level

as necessary.

SPECIFICATIONS

Accuracy:±3% of full scale.

Maximum Internal Working Pressure:

15 psi (100 kPa).

Maximum Working Temperature: 150°F

(65°C).

Scale Length: Approx. 8-1/4˝(21 cm).

Weight: 10 oz (283.49 g).

Accessories: 3/4 oz. gage oil, mounting

screws, 1/8˝NPT tubing adapters, wash-

ers, nuts, red and green pointer flags, (2)

4-1/2 ft. lengths 3/16˝I. D. vinyl tubing.

MARK II MODEL 40

D-59:Bulletin D-59 7/10/09 11:05 AM Page 1

Portable Applications: For portable

use, a molded plastic swing-away foot and

leveling screw are provided. Referring to the

picture on the first page of this bulletin,

secure the swing-away foot to the bottom of

the gage, using the plastic screw in the

tapped hole on the right-hand side. Install

the plastic leveling screw in the tapped hole

on the bottom left side of the manometer. In

use, the swing-away foot is positioned per-

pendicular to the gage. With the manometer

in operating position, the leveling screw is

adjusted until the bubble is centered in the

spirit level. For storage, the swing-away foot

can be rotated to a position in line with the

gage body.

FILLING

Turn the zero adjust knob fully counterclock-

wise until it stops; then turn it clockwise

approximately four full turns so as to center

the adjustment to allow room for adjusting

either side of zero. Unscrew the entire low

pressure (right) shut-off connection fitting. A

3/4˝ wrench is required. Also, remove the

cork, disc, and “O” ring. Vent the left con-

nector by turning the elbow 1 - 2 turns

counterclockwise. Slowly fill gage with fluid

provided until fluid rises in the indicating

tube to the vicinity of zero on the scale.

Nearly all the oil provided will be required to

fill the gage. Replace the cork, disc, “O” ring

and the low-pressure shut-off

connection fitting.

OPERATION

The Model 40 manometer is provided with

convenient shut-off tubing connections to

prevent loss of oil when transporting the

gage. To use the gage, turn each barbed

tubing connection counterclockwise 1-2

turns from the closed (fully clockwise) posi-

tion. Rotate the zero adjustment for an exact

zero reading and the gage is ready for use.

In stationary installations, these steps need

only be performed upon initial installation. In

portable use, each time the gage is used the

connections must be opened, the gage lev-

eled and zeroed; prior to storage, the gage

connections must be closed.

Pressure Connection: Two 4-1/2˝

lengths of plastic tubing are included with

the gage along with two adapters for con-

nection of the tubing to 1/8˝NPT fittings or

sheet metal ducts. The tubing from the high

pressure pickup should be connected to the

high pressure (left) barbed connection at the

top of the gage. The tubing from the low

pressure pickup should be connected to the

low pressure (right) barbed fitting. Stick-on

red and green arrows are provided to indi-

cate the appropriate range of readings for

the particular application. The 1/8˝NPT

tubing adapters can be used as static pres-

sure sensors in sheet metal ducts by drilling

a 7/16˝diameter hole in the duct and

mounting the adapter in the hole, placing

one of the washers on each side of the duct

wall and securing the 1/8˝NPT nut.

TYPICAL APPLICATIONS

Draft Gage: Run iron pipe, 1/8˝or larg-

er in size, from the source of the draft to a

point within 4-1/2˝of the manometer.

Provide a means for periodic clean-out to

remove any soot accumulation. Using one

of the lengths of tubing provided, make the

connection from the pipe to the low pres-

sure (right) fitting on the gage.

CAUTION

USE .826 SPECIFIC GRAVITY RED

GAGE OIL FOR MODEL #’S 40-1, 40-1-

AV, 40-250 Pa, 40-250 Pa-AV, and 40-

25 mm. Use 1.910 SPECIFIC GRAVITY

BLUE GAGE OIL FOR MODEL #’S 41-

2, 41-2-AV, 41-600 PA, 41-60 mm.

D-59:Bulletin D-59 7/10/09 11:05 AM Page 2

Static Pressure 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 pro-

vided 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 atmos-

phere. Where air velocities in the duct are

1000 ft. per minute or higher, static pressure

error may be induced unless a static pres-

sure 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 fit-

ting 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 accu-

racy. 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 con-

ditions, corrections may be based upon the

following

formula: Pv

Air Velocity (FPM) = 1096.5 √

Where Pv = velocity pressure in in./H

D = air density in lbs. per ft

D = 1.325 x Pb

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.

D-59:Bulletin D-59 7/10/09 11:05 AM Page 3

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 Fax: 219/872-9057 e-mail: info@dwyer-inst.com

MICHIGAN CITY, INDIANA 46361,U.S.A

Range

40-1

40-1-AV*

41-2

41-2-AV*

40-250 Pa

40-250-AV*

41-600 Pa

40-25 mm

41-60 mm

.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.

.01˝w.c.

varies

.02˝w.c.

varies

2Pa

varies

5Pa

2 mm w.c.

5 mm w.c.

.826 sp. gr.

(red oil)

.826 sp. gr.

(red oil)

1.910 sp. gr.

(blue oil)

1.910 sp. gr.

(blue oil)

.826 sp. gr.

(red oil)

.826 sp. gr.

(red oil)

1.910 sp. gr.

(blue oil)

.826 sp. gr.

(red oil)

1.910 sp. gr.

(blue oil)

Model Minor

Grads Indicating

Fluid

OPERATING RANGES

* Pitot tube required at additional cost. See Bulletin H-100.

D-59:Bulletin D-59 7/10/09 11:05 AM Page 4

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