Dwyer 8912 User Manual
OPERATION MANUAL
ANEMO-PSYCHROMETER
&
BTU-PSYCHROMETER
Model:8903/8904/8906
Model:
8902
8911
8912
INTRODUCTION
Thank you very much for purchasing
this Anemo-Psychrometer.
This unique meter design with 7 H.V.A.C
&R must parameters in 1. The meter
designed as battery operated for Humidity
,Air temp., Dew Point, Wet Bulb, Air
Velocity, Air Volume & BTU (8912).
The sensor is built in the remote fan and
is specially protected by tunable cap.
While in operation, please turn on the cap
to get accurate temperature and humidity
reading.
The psychrometer is a micro processorbased design. A must device for HVAC
engineers use. No need to whirl the
meter or refer to the chart. Easy to get
wet bulb, dew point and BTU(8912)
quickly!
Features :
Tunable cap to p rot ect s ensor
Up to 8 ve loc ity m emory (only 8 911 )
Big LCD digit display
Professional remote vane
Metric& Imperial selectable
Handheld size, easy to carry
Low battery indication
Fast response &
Tripod mountable for long time use
Dew Point calculated in seconds
Wet Bulb calculated in seconds
Microprocessor circuitry for reliability
Sleep and non-sleep selectable
Powered by 4 AAA batteries or 9VDC
adaptor
Back light for dark places
Accurate reading
1
MATERIAL SUPPLIED
This package contains:
The meter x 1
Remote vane x1
Battery x 4 (AAA size )
Operation manual x1
Hard carry case x1
Optional accessory:
AC to DC 9V adaptor
RS232 cable & CD
REMINDER
Important:
1. Rotate the cover before measurement
to ensure the measured data is correct.
2. The fan and meter are sold as a kit and
.
are well calibrated.
When you need to replace the fan,
please see page 16 for the details of
fan replacement.
CONTROLS AND INDICATORS
LCD DI SPL AY
DPWBA VOLVG CAPMAXMIN
C
F
%RH
m/s
ft/m
3
cfm
REC HOLD
L
D
W
AREA
cm
inch
2
2
2
WAIT
M/m
Btu/hKw
START
KEY PAD
1.Pow er :
-Tu rn on t he me ter wit h aut o-s lee p mode.
-Tu rn off th e met er at a ny mode .
-Whe n the m ete r is off, p res sing mo re
than t wo se c. to e nter units s ele cti on.
2.MOD E:
-Pre ssi ng to s ele ct diff erent m ode s.
Temp. DP WB RH Ve locity.
-Pre ssi ng lo nge r to sele ct VO L an d CAP.
3.ENT ER:
- To confi rm the se tti ng & ca lib ratio n.
4.Mx/ Mn/ Up :
-Pre ssi ng to v iew M AX/MI N/AVG va lue .
-Pre ss to s ele ct th e value o f eac h dig it
in cyc le.
5.REC /START :
- In vel oci ty mo de, p ressi ng th is ke y to
stor e the c urr ent veloci ty re adi ng in to
memo ry (8 911onl y)
- To start measur ing v olu me or c apaci ty
(891 2 onl y) wi tho ut wait ing .
3
6.HOL D/D own :
- In bas ic mo des p res sing th is ke y to
hold t he cu rre nt re ading , the n pre ssi ng
this k ey ag ain t o unl ock the h old ing .
- Pres sin g to se lec t the set tin g dig it.
7.Pow er + :
- When t he me ter i s off, pr ess ing mor e
than t wo se c. to e nter non-s lee p mod e.
8.Pow er + + :
- Pres sin g mor e tha n two sec ond s to
ente r RH ca lib rat ion mod e.
9.EN TER + :
- Pre ssi ng t o tu rn on/ off th e ba ckl igh t.
POWER ON/OFF & UNIT SELECT
Pres s to tu rn on t he meter wit h
auto -sl eep m ode . Press a gai n to tu rn
off the meter a t any m ode .
When t he me ter i s off, pr ess ing
more t han t wo se con ds to ent er un its
sele cti on mo de.
C
%RH
m/s
3
M/m
Kw
cm
Or
inch
When i n uni t sel ect ion mod e, pr ess
or to se lec t the u nit, th en,
pres s to sa ve an d meter will b e
powe red o n aut oma tical ly.
%RH
Btu/h
F
Ft/m
cfm
BASIC MEASUREMENT
Plea se re fer t o bel ow tabl e of th e bas ic
meas ure d par ame ters of e ach m ode l
4
Basi c Mea sur e
8902 89128911
Air tem p.
Humid it y
Dew Poi nt
Wet B ul b
Air Velo ci ty
Vel with
avera ge
Exte nd Me asu re
8902 89128911
Air Volu me
Sum of
Volume
Capac it y
Sum of
Capac it y
When p owe r on, t he ai r tempe rat ure
is the d efa ult v alu e to show o n the L CD.
To revie w the o the r bas ic para met ers ,
just p res s key t hen each par ame ter
will b e dis pla y in tu rn.
Whil e in ba sic m ode , press f or ov er
2 seco nds t o ent er ex tend me asu rem ent
mode . For 8 912 , als o press k ey to
swit ch be twe en vo lume an d cap aci ty.
Veloc ity w ith m emo ry (8911 o nly )
In vel oci ty mo de, p ress to s tor e
valu e int o mem ory. A recor d num ber wil l
be dis pla yed o n the t op-le ft of t he LC D.
The ma x. re cor d is 8 po ints. (Fi g.A )
REC
m/s
(Fig .A)
5
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