Dwyer Instruments 8904 Operating Manual

OPERATION MANUAL

RS232

INTEGRAL VANE

DIGITAL ANEMOMETER

Model:8903/8904/8906

Model:

8903 8904 8906

Congratulations on your purchase of this Integral vane anemometer. The meter features versatile functions, use it to check air velocity FPM (Feet per minute) and CFM (Cubic feet per minute) in residential , light commercial and standard commercial systems.

Thank you for selecting the meter. Please read this operation manual throughly before operation. This meter has many user-friendly features, all the features are accessible through the keypads.

Please contact the store or the place you purchased for the rest models you might interested in.

The meter is most ideal for HVAC/R technicians measuring Heat / Ventilation / Air conditioning / Refrigerating wind flow and temperature.

CAUTION: Objects strike the fan may damage the meter.

Model:

AZ8903

AZ8904

AZ8906

Knot, MPH,

KM/H

selectable

No

Yes

Air Flow

Volume

Measurement

No

Yes

1

FEATURES

Measuring Air Velocity (Single point)

A.

Feet per Minute (FPM).

B.

Continuous Moving Average.

C. MIN/MAX/AVG reading on a single point. D. Air Velocity average for multiple points ( 8904.8906 model only).

E. Non Sleep Mode(Bypass auto power off).

F. Default setting ( Imperial/ Metric)

G. RS232 interface setting.

H. Auto power off function.

I. FTM , MPH , KNOT unit selectable

(8904.8906 model only).

J. Direct measuring of air flow (Single point) CFM ( 8906 only).

K. Obtain air flow (CFM) average for multi-point ( 8906 only).

Typical Measurement

a) Please place the meter in the airstream. Make sure that the airstream and the sensor are aligned as shown ( 20 degrees maximum).

b) 3 seconds for the reading to stabilize .

Rear side

o

20

o

20

2

FRONT PANEL DESCRIPTION

Model:8903

HOLD

AVERAGE

MIN/MAX REC SINGLE-POINT

MULTI-POINT

Model:8904

ON-OFF

ON

-OF F/R

ESET

MOD

E-VE

LOC

FRE

ITY

E AREAF

LOW

HOLD

AVER

AGE

MUL

TI-PO

SEL-

INT

MIL/H

KNOT

MIN/MAX REC SINGLE-P

OINT

ve

l

F

L

O

W

AR

E

A

H

old

P

H

Kno

ts

ft

2

/m

ft

m

2

/s

m

il

/h

c

k

m

/h

c

M

IN

RE

C

M

A X

AV

G

RESET

AVERAGE MULTI-POINT

Model:8906

ON-OFF/RESET

AVERAGE MULTI-POINT

SEL-MIL/H

- KNOT

MODE-VELOCITY FREE AREAFLOW

SEL- MPH

- KNOTS

HOLD

MIN/MAX REC SINGLE-POINT

HOLD

MIN/MAX REC SINGLE-POINT

BUTTON / DISPLAY

1.ON/OFF- RESET. Power ON/OFF. Press with HOLD key to set non-sleep mode.

2.HOLD. Freezes the reading.

3.AVERAGE MULTI-POINT.

4.MN/MX RECORD SINGLE POINT

5.SEL:MIL/H (MPH) ,KNOT. unit selectable . (Model:8904 & 8906 only)

6.MODE VELOCITY, FREE AREA , FLOW. (Model:8904/8906 only) Air volume measurement .

3

INDICATORS

1.vel.

2.FLOW. Air Flow/Air volume.

3.AREA.

4.Hold.

5.ft/m.

6.ft .

7.m .

8.cfm.

9.cms.

10.C. Celsius unit.

11.F.

12.REC.

13.AVG.

14.MIN.

15.MAX.

16. Primary readout-Numerical display

for Air Velocity/ Air Volume/Free area digit

17. Secondary readout -Temperature display or records number.

18. "-" Polarity indicator for negative temperature.

19. Knots.

20. Mil/h.

21. Km/h.

Air velocity measurement.

Free area default setting. Freezes the reading. Feet per minute.

2

Feet square.(imperial)

2

meter square.(metric) Cubic feet per minute.(imperial) Cubic meter per second.(metric)

Fahrenheit unit. Record and saved. Average data

Minimum data Maximum data

(KN)=1850 meters per hour

or 1.15 miles per hour (Imperial) Miles per hour (Metric) Km/h Kilometer per hour

FLOW

vel Hold PH Knots

AREA

REC

MIN

AVG

MAX

2

ft/m

ft

2

m

m/s mil/h cfm km/h cms

4

A. MEASURING AIR VELOCITY (SINGLE POINT) FEET PER MINUTE (FPM)

1. Press the ON/OFF button to turn the meter on. Meter will show full display for initial 5 seconds. (See Fig.1)

2. Unit is ready for use when LCD display shows "vel" at upper left corner and temperature at lower right corner. (See Fig.2)

Fig.1 Fig.2

FLOW

vel Hold PH Knots

AREA

ft/m

m/s

mil/h cfm

REC

MIN

AVG

MAX

km/h cms

ft m

vel

2

ft/m

B. CONTINUOUS MOVING AVERAGE

The meter has the ability to display continuous moving average for up to two(2) hours.

1. Turn the power ON .

2. Place sensor in front of air flow source.

3. Press MIN/MAX record key once. An "AVG" and "REC" in the lower left corner of the display to confirm the meter is in continuous moving average measurement mode. The display will update every second. (See Fig.3)

Fig.3

vel

m/s

REC

AVG

5