Dwyer Instruments 477-000-FM Manuale utente

Series 477 Digital Manometers are versatile, hand-held, battery operated manometers available in several basic

ranges from 0-20 in. H2O up to 0-150 psid. All models measure either positive, negative or differential pressures with

±0.5% of full scale accuracy. You can select from up to nine common English and metric pressure units so conversions

are not necessary. A memory function allows storage of up to 40 readings for later recall and a backlight provides aux-

iliary lighting for hard-to-see locations. Also standard are a hold feature plus both visual and audible overpressure

alarms.

Series 477 Handheld Digital Manometer

Specifications - Installation and Operating Instructions

Bulletin D-22

SPECIFICATIONS

Service: Air and compatible gases.

Wetted Materials: Consult factory.

Accuracy: ±0.5% F.S., 60 to 78°F (15.6 to 25.6°C);

±1.5% F.S. from 32 to 60°F and 78 to 104°F (0 to

15.6°C and 25.6 to 40°C).

Pressure Hysteresis: ±0.1% of full scale.

Pressure Limits: See chart.

Temperature Limits: 0 to 140°F (-17.8 to 60°C).

Compensated Temperature Limits: 32 to 104°F (-0 to

40°C).

Storage Temperature Limits: -4 to 176°F (-20 to 80°C).

Display: 0.42˝ (10.6 mm) 4-1/2˝ digit liquid crystal.

esolution: See chart.

Power equirements: 9 volt alkaline battery. Battery

included but not connected.

Weight: 10.2 oz (289 g).

Connections: Two barbed connections for use with 1/8˝

(3.18 mm) or 3/16˝ (4.76 mm) I.D. tubing. Two compres-

sion fittings for use with 1/8˝ (3.18 mm) I.D. x 1/4˝ (6.35

mm) O.D. tubing for 477-6-FM & 477-7-FM only.

Agency Approvals: CE, FM approved to

IS / I / 1 / ABCD / T4 / Ta = -17.8°C to 60°C;

I / 0 /AEx ia IIC / T4 Ta = 17.8°C to 60°C.

Model*

477-000-FM

477-00-FM

477-0-FM

477-1-FM

477-2-FM

477-3-FM

477-4-FM

477-5-FM

477-6-FM

477-7-FM

477-8-FM

ange

0-1.000 in w.c.

0-4.000 in w.c.

0-10.00 in w.c.

0-20.00 in w.c.

0-40.00 in w.c.

0-200.0 in w.c.

0-10.00 psi

0-20.00 psi

0-30.00 psi

0-100.0 psi

0-150.0 psi

kPa

.2491

0.996

2.491

4.982

9.96

49.82

68.95

137.9

206.9

689.5

1034

bar

.0498

.0996

.4982

.6895

1.379

2.069

6.895

10.34

psi

.1445

.3613

.7225

1.445

7.225

10.00

20.00

30.00

100.0

150.0

in Hg

.0736

.2942

.7355

1.471

2.942

14.71

20.36

40.72

61.08

203.6

305.4

in w.c.

1.000

4.000

10.00

20.00

40.00

200.0

276.8

553.6

830.4

2768

4152

mm Hg

1.868

7.473

18.68

37.36

74.73

373.6

517.1

1034

1551

5171

7757

mbar

2.491

9.96

24.91

49.82

99.6

498.2

689.5

1379

2069

6895

mm w.c.

25.40

101.6

254.0

508.0

1016

5080

7031

249.1

996

2491

4982

9964

Available Pressure Units

DWYE INST UMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com

Maximum

Pressure

5 psig

10 psig

30 psig

60 psig

150 psig

200 psig

QualityInstruments-Direct.com 1.888.475.5235

INST UCTIONS

Battery Installation

The unit is shipped with a separate 9 volt alkaline battery which must be installed before operation. Remove the two

screws holding the bottom endcap in the place and remove it. Connect the battery to the enclosed battery clip observ-

ing correct polarity. Be careful not to trap wires between the battery, case or foam pads which retain the battery. This

could make it difficult to install the battery or remove it later for replacement. Be sure the rubber gasket is properly seat-

ed in the gasket channel and replace endcap. Note that the endcap will only fit one way because the holes are slight-

ly off-center. Place the “Z” shaped wrist strap clip in one of the screw recesses and replace the screws. Do not over-

tighten. Attach wrist strap to clip.

When battery replacement becomes necessary, use only a 9 volt alkaline type such as a Duracell® MN1604, Energizer®

522 or Energizer®EN22. Zinc-carbon types, often labeled Heavy-duty are not recommended because of the increased

potential for leakage. Alkaline batteries are also a better value because they last up to three times longer in this device.

On-Off Operation

The on-off control is a toggle function. Press the ON/OFF key once to turn unit on; again to turn it off. If the manome-

ter is left on with no activity for approximately 20 minutes, unit will turn itself off to conserve the battery.

Display Backlight

The Model 477 includes a display backlight to allow use in the dark or in poor lighting conditions. Units must be

switched off before this feature can be activated. Next, press and hold the ON/OFF key down. After about 1 second

the backlight will come on and remain lighted for approximately 2 minutes after which it will turn itself off to conserve

battery life.

Zeroing Pressure eading

Potential inaccuracy due to temperature effects can be minimized by re-zeroing immediately before use. To zero the

display, vent both ports to atmosphere so no pressure is applied to either port. Press the ZERO/STORE key and - - -

- will be momentarily displayed as zeroing occurs. Zeroing is not possible when the memory mode is in use. It must be

done before selecting that function.

If the unit is accidently zeroed with pressure applied to one of the ports, internal circuitry might detect an error and dis-

play A ARM 1 or A ARM 2 at the top of the readout area. Additionally, if the ports are then vented, the audible over-

pressure alarm may sound continuously. This will not normally cause harm it the maximum pressure has not been

exceeded. To correct the fault, vent the pressure ports to atmosphere and press the ZERO/STORE key to zero the unit.

The fault will then be corrected.

Enclosure parts are constructed of plastic. When cleaning the exterior use a damp cloth to avoid

electrostatic sparking. Enclosure parts are constructed of aluminum. Enclosure must be protected

from mechanical friction and impact with iron/steel to prevent ignition capable sparks.

WA NING

QualityInstruments-Direct.com 1.888.475.5235

Pressure Connections

Dual size barbed connections are provided to fit both 1/8″ and 3/16″ I.D. rubber or vinyl tubing. For a single positive pres-

sure, connect tubing to port marked + and vent opposite port to atmosphere. For a single negative pressure (vacuum),

connect tubing to port marked - and vent opposite port to atmosphere. To measure differential pressure, connect high-

er pressure to port marked + and lower pressure to port marked -. Manometer will indicate the difference between the

two.

Selecting Pressure Units

Up to nine pressure units are available. The display will indicate the current selection. To change to different units, use

the UNITS/ OC key. Each touch will cause an advance to the next choice. The selected units will remain in memory

even when power is shut off. This way, your preference will always be displayed after the initial selection.

Display Hold

There may be situations where you want to temporarily retain a reading. The Model 477 includes a Display Hold fea-

ture which freezes the current reading and holds it in the display until cleared. To activate this operation, momentarily

press the HO D/MEMORY key when the pressure you want to save is displayed. A HO D indicator will appear in the

display to indicate that the reading shown is frozen. To return to normal operation, press the HO D/MEMORY key

again.The HO D indicator will disappear and the current pressure will again be shown.

Memory Function

A memory function is included in the Model 477 that allows you to store up to 40 pressure readings for later review or

recording. This feature is especially valuable for making a traverse of duct velocity pressures with a Pitot tube or for

multipoint pressure measurements. The readings are stored in non-volatile memory so they will be retained even if the

unit is shut off or the battery is removed.2

Entering Memory Mode

To enter the memory mode, press and hold the HO D/MEMORY key until the MEM indicator appears in the display.

The key can then be released. The active memory location will be shown in the small lower left numeric display. Initially

it will read 01.

Storing Pressure eadings

To store a reading, press the ZERO/STORE key. The reading will be stored under the indicated memory location and

a beep will sound indicating that the reading has been saved. As each reading is saved the memory location display

will advance to the next number. Note that in the memory mode, the display zero function is not available. To zero the

display, you must first exit the memory mode and then press the ZERO/STORE key.

QualityInstruments-Direct.com 1.888.475.5235

Viewing Stored eadings - Selecting a Location

To view the contents of memory the unit must first be in the memory mode. The current pressure is not displayed. To

distinguish the memory display from a current reading, the HO D indicator will be shown. Each time the UNITS/ OC

key is pressed, the memory location will advance to the next stored reading. If the key is held down, the unit will auto-

matically scroll through the stored readings until the key is released. This procedure can also be used to select a spe-

cific location to store a new reading. To resume pressure measurement, press the HO D/MEMORY key. The HO D

display will disappear and the display will again show the current pressure. The last viewed memory location will remain

displayed. The next time a reading is stored it will be saved in the indicated position.

Clearing Memory

To clear the contents of memory the unit must first be in the memory mode. All previously stored readings can then be

cleared by holding the ZERO/STORE key and simultaneously pressing the ON/OFF key. During this operation - - - -

will be displayed. Once memory is cleared, the current pressure will be displayed and the memory location will be reset

to 01.

Exiting Memory Mode

To exit the memory mode press the HO D/MEMORY key. The memory indicator will disappear. All readings stored in

memory will be saved for later review.

Overpressure Alarm

A visual indicator and audible alarm are provided to alert the operator that pressure has exceeded the operating range

of the unit. Exceeding the range will not damage it or affect calibration as long as the maximum rated pressure is not

exceeded. Do not exceed the maximum rated pressure of the manometer. Doing so will cause permanent damage

to the sensor, may rupture the housing and/or cause injury. The maximum pressure is shown on the rear label and

on page 1 of these instructions.

Low Battery Indicator

A weak battery can cause improper operation or inaccurate measurements. A low battery indicator is provided on the

display to show when the battery needs replacement. Although the unit might appear to function and indicate proper-

ly, the accuracy of readings cannot be guaranteed when the OW BAT indicator is illuminated. Replace the battery with

a fresh one. Do not leave an exhausted battery in the unit due to potential leakage.

MAINTENANCE

The Series 477 Handheld Digital Manometer is not field serviceable and should be returned if repair is needed (field

repair should not be attempted and may void warranty). Be sure to include a brief description of the problem plus any

relevant application notes. Contact customer service to receive a return goods authorization number before shipping.

Duracell®is a registered trademark of The Gillette Company.

Eveready®is a registered trademark of Eveready Battery Company, Inc.

DWYE INST UMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com

QualityInstruments-Direct.com 1.888.475.5235

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