Dwyer Instruments 8901 Operating Manual

OPERATION MANUAL

RS232

REMOTE VANE

DIGITAL ANEMOMETER

Model:

8901

INTRODUCTION

Congratulations on your purchase
of the remote vane Anemometer.
The meter features versatile functions,
use it to check air velocity FPM (Feet
per minute) and air volume 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 operating your meter,
it has many user-friendly features , all
of which are accessible through the
keypad .

The meter is most ideal for HVAC/R
technicians measuring Heat / Ventilation
/ Air conditioning / Refrigerating wind flow
and temperature.
CAUTION: Objects striking the fan may
damage meter.

C

F

M

v

e

l

ft/m

AIR

AIR

S

S

P

P

E

E

E

E

TE

TE

D

D

M

M

A

A

P

P

IR

IR

E

E

V

V

R

R

A

A

E

E

8

TU

TU

LO

LO

9

RE

RE

0

CIT

CIT

1

M

M

Y

Y

&

&

E

E

A

A

S

S

U

U

R

R

E

E

M

M

E

E

NT

NT

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 .

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

F. Default setting ( Imperial/ Metric)

G. RS232 interface setting.

H. Auto power off function.
I. Direct measuring of air flow

(Single point) CFM
J. Obtain air flow (CFM) average
for multi-point

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 .

o

20

o

20

Rear side

2

FRONT PANEL DESCRIPTION

BUTTON / DISPLAY

1.ON/OFF. Power on or off .

2.HOLD SET/SAVE. Freezs the reading.
Adjust the digit to the value needed.

3.SEL/AVG ,NXT DGT-> MULTI-P.
AVERAGE . Display the average of
all the measurements. Select the next
digit for editing.

4.MN/MX REC SINGLE-P
View the minimum or maximum ,
average or record value .

5.MODE :

VELOCITY .Air Velocity in FPM .
FREE AREA. Enter area value .
VOLUME. Air Volume mode.

3

INDICATORS

1.vel.

Air velocity measurement.

2.FLOW. Air Flow/Air volume.

3.AREA.

4.Hold.

5.ft/m.
m/s

6.ft .

7.m .

8.cfm.

9.cms.

Free area degault setting.
Freezs the reading.

Feet per minute.(imperial)
Meter per second.(metric)

2

Feet square.(imperial)

2

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

10.C. Celsius unit.

11.F.

12.REC.

13.AVG.

14.MIN.

15.MAX.

Fahrenheit unit.
Record and saved.
Average data

Minimum data
Maximum data

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.

1850 meters per hour

Miles per hour
Kilometer per hour

FLOW

vel Hold PH Knots

MIN

MAX

AREA

REC

AVG

ft/m
m/s
mil/h cfm

km/h cms

2

ft

2

m

4

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

1. Press the ON/OFF button and turn
meter on. Meter will show full display
when first powered on in 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

FLOW

vel Hold

AREA

REC

MIN

AVG

MAX

2

ft/m

ft

2

m

m/s

cfm
cms

Fig.2

vel

m/s

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 MN/MX record key once.
An "AVG" in the lower left corner
of the display confirms the meter
is in the continuous moving average
measurement mode. The display
will update once per second.
(See Fig.3)

Fig.3

vel

m/s

AVG

5