Supco DAVM+ User manual

 Air Flow/FPM
 Air Volume/CFM
 Temperature°F/°C
 Humidity/5% RH
 Light Le el/LUX
Digital Air Flow/
Volume Meter
Plus
157.48
CFM
DAVM+
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

TABLE OF CONTENTS
1. FEATURES.............................................................................. 1
2. SPECIFICATIONS.................................................................... 2
3. FRONT PANEL DESCRIPTION.................................................. 5
3-1 ON/ESC Button................................................................ 5
3-2 Hold Button..................................................................... 5
3-3 REC/Ente Button............................................................. 5
3-4 Unit/Ze o/ (CFM/CMM) Butto...................................... 5
3-5 °C/°F/ Lux/Ft-cd, A ea-Set Button................................ 5
3-6 Function/ Button........................................................ 5
3-7 Anemomete Senso ......................................................... 5
3-8 The mocouple Input Socket.............................................. 5
3-9 Humidity Senso ............................................................... 5
3-10 Light Senso ................................................................... 5
3-11 LCD display.................................................................... 5
3-12 Batte y Compa tment/Cove ............................................ 5
3-13 W istlet......................................................................... 5
4. MEASURING PROCEDURES..................................................... 6
4-1 AIR VELOCITY MEASUREMENT.......................................... 6
4-2 TEMPERATURE MEASUREMENT
(The mocouple)..................................................................... 6
4-3 RELATIVE HUMIDITY MEASUREMENT................................ 7
4-4 LIGHT MEASUREMENT......................................................7
4-5 AIR FLOW (CFM. CMM) MEASUREMENT............................. 8
5. OTHER FUNCTIONS................................................................ 9
6. BATTERY REPLACEMENT.........................................................10

1. FEATU ES
* 5 in 1 p ofessional measu ing inst ument: Anemomete ,
Ai flow, Hyg omete , The momete , and Light mete .
* Multi channel display fo elative humidity, tempe atu e,
and ai velocity measu ed values at the same time.
* Ai velocity measu ing units selectable by p essing button on
the f ont panel fo five kinds of units.
* Ai flow (CFM. CMM) measu ement by setting the desi ed a ea
dimension.
* Low-f iction ball bea ing mounted wheel design p ovides
high accu acy at high and low ai velocity.
* High p ecision thin-film capacitance humidity senso with
fast esponse to the humidity changes.
* °F/°C selectable by p essing button on the f ont panel.
Lux/Feet-candle selectable by p essing button on the f ont panel.
* Standa d type K (NiC -NiAl) the mocouple input jack
suitable fo all kinds of type K p obe.
* Built-in mic op ocesso ci cuit assu es excellent
pe fo mance and accu acy.
* Button a angement allows easy ope ation.
Maximum and minimum value with ecall.
* Hold function to f eeze the cu ent eading value.
* Lightweight and small size case design
a e suitable fo handling with one hand.
* W istlet design p ovides ext a p otection to the inst ument
especially fo use one hand ope ation.
1

Display 8 mm LCD display
Measurement Anemometer, Humidity, Temperature,
Light, Air flow ( CFM/CMM .
Operating Max. 80% RH.
Humidity
Operating 32 to 122°F (0 to 50°C
Temperature
Over Input Indication of - - - - 
Display
Power Supply 006P DC 9V battery (Heavy duty type
Power Approx. DC 6.2 mA
Consumption
Weight 5.6 oz (160g
Dimensio 6.14x2.36x1.29 inch
156 x 60 x 33 mm
Standard SCASE Carrying Case
Accessory
Optional TPFG Thermocouple Probe
Accessories TPFDA Approved Thermocouple
TPP Thermocouple Piercing Probe
TPS Thermocouple Surface Probe
2
2. SPECIFICATIONS
2-1 General Specifications

3
2-2 Measurement Specifications
Measurement Range Resolution
Ai velocity ft/min 80 to 5,910 ft/min 1 ft/min
m/s 0.4 to 30.0 m/s 0.1 m/s
km/h 1.4 to 108.0 km/h 0.1 km/h
MPH 0.9 to 67.0 mile/h 0.1 MPH
knots 0.8 to 58.3 knots 0.1 knots
Tempe atu e 32 to 122 °F 0.1 °F
(the miste ) 0 to 50 °C 0.1 °C
Measurement Range Resolution
Ai flow CFM 1,908,400 CFM 0.001 to 100
cube feet/min CFM
CMM 54,000 CMM 0.001 to 1
cube meter/min CMM
Measurement Range Resolution
Humidity % RH 10 to 95 % RH 0.1 % RH
Tempe atu e 32 to 122 °F 0.1 °F
( the miste ) 0 to 50°C 0.1 °C
Measurement Range Resolution
Light Lux 0 to 2,200 Lux 1 Lux
1,800 to 20,000 Lux 10 Lux
* auto range Ft-cd 0 to 204.0 Fc 1 Ft-cd
170 to 2,000 Fc 1 Ft-cd
Measurement Range Resolution
Tempe atu e (Type K) -148 to 2,372 °F 0.1 °F
Optional -100 to 1,300 °C 0.1 °C

Measurement Range Accuracy
Air velocity 80 to 5,910 ft/min
0.4 to 30.0 m/s < 20 m/s : + 3% F.S.
1.4 to 108.0 km/h > 20 m/s : + 4% F.S.
0.9 to 67.0 mile/h
0.8 to 58.3 knots
32 to 122 °F + 2.5 °F
0 to 50 °C + 1.2 °C
Remark :
ft/min : feet per minute MPH : miles per hour
m/s : meters per second knots : nautical miles per hour
km/h : kilometers per hour Ft-cd : feet candle
Measurement Range Accuracy
Humidity 10 to 95% RH < 7 % RH :
+ 4% RH
> 7 % RH :
: + (4%rdg+1.2%RH
32 to 122 °F + 2.5 °F
0 to 50 °C + 1.2 °C
Measurement Range Accuracy
Light 0 to 20,000 Lux + 5% rdg + 8 dgt
0 to 2,000 Fc
Measurement Range Accuracy
Temperature -148 to 2,372 °F +(1% rdg + 2°F
(Type K -100 to 1,300 °C +(1% rdg + 1°C
Measurement Area setting
CFM 0.01 to 322.92 feet square
CMM 0.001 to 30.000 meter square
4

3. F ONT PANEL DESC IPTION
5
Fig. 1
3-1 ON/ESC Button 3-6 Function/ Button
3-2 Hold Button 3-7 Anemometer Sensor
3-3 REC/Enter Button 3-8 Thermocouple Input Socket
3-4 Unit/Zero/ 3-9 Humidity Sensor
(CFM/CMM Button. 3-10 Light Sensor
3-5 °F/°C/ 3-11 LCD display
Lux/Ft-cd 3-12 Battery Compartment /
Cover
Area-set Button 3-13 Wristlet

4. MEASU ING P OCEDU E
4-1 Air Velocity Measurement
1 Power on the instrument by pressing the  ON Button 
(3-1, Fig.1 .
2 Select the Anemometer function by pressing  Function
Button  (3-6, Fig.1 .
3 Press the  Unit/Zero Button  (3-4, Fig.1 to select unit
that you want and then face the  Anemometer Sensor 
(3-7, Fig.1 to the source of wind.
4 Allow time for the reading to become stable and note the
value indicated. From a practical point of view the velocity
may fluctuate.
4-2 Temperature Measurement
(Thermocouple)
1 Power on the instrument by pressing the  ON Button 
(3-1, Fig. 1 ..
2 Plug a type K thermocouple probe in the  Thermocouple
Input Socket  (3-8, Fig.1 .
3 Select the Temperature function by pressing  Function
Button  (3-6, Fig.1
4 Press the  °F/°C Button  (3-5, Fig.1 to select °F or °C
unit.
5 Contact the Thermocouple Sensor Head with measuring
object and the reading value will be displayed on the LCD
display.
Measuring Consi eration of Temperature
Measurement ( Thermocouple )
* Please make sure the polarity is correct when you plug a
thermocouple probe in the Temp. input socket.
6

7
* The temperature difference between thermocouple
probe and thermometer will cause an inaccurate
measuring result. Therefore, for the best measuring
and accuracy performance, whenever changing a probe
or plugging a new probe, thermal equivalent between
probe plug and meters input socket is a necessary
condition. Thermal equivalent procedure may take few
minutes and apply only when the probe has been exposed
to an ambient temperature different from the meter.
4-3 Humi ity & Ambient Temperature
Measurement
1 Power on the instrument by pressing the  ON Button 
(3-1, Fig. 1 .
2 Select the Relative Humidity function by pressing
 Function Button  ( 3-6, Fig. 1 .
3 At the mean time the reading value of relative humidity
and temperature will be displayed on the LCD display.
4 When the meter is applied in a new environment, a few
minutes are required to reach a stable condition.
4-4 Light Measurement
1 Power on the instrument by pressing the  ON Button 
(3-1, Fig.1 .
2 Select the Light Measurement function by pressing the
Function Button ( 3-6, Fig. 1 until the light value is
displayed. The light display digits are oriented 180° from
the other function displays for easy exposure and output
reading of the light sensor.
3 Press the  Lux/Ft-cd Button  (3-5, Fig.1 to
select measuring unit  Lux  or  Ft-cd .

8
Zero Offset A justment of Light Function :
* For best results zero the light sensor prior to use in a
dark environment. Placing the light sensor end of the
meter under a desktop or flat surface so as to block
any light can accomplish this. Then press the
 Unit/Zero Button  (3-4, fig.1 to set the meter
indication to zero.
* Zero point can drift due to environment temperature
and battery power change as well as for other reasons.
It is recommended that the zero be checked
frequently using the above procedure.
* Zero adjustment only can be executed if the measurement
Light value < 20 Lux.
4-5 AIR FLOW (CFM. CMM) MEASUREMENT
1 Power on the instrument by pressing the  ON
Button  (3-1, Fig.1 .
2 Select the Air Flow function by pressing
 Function Button  (3-6, Fig.1 until the display show
unit of CMM or CMM.
* Air flow unit  CFM  or  CMM  can be select by
pressing the  CFM/CMM Button  (3-4, Fig.1
* Area size can be set by pressing the  Area-Set
Button  (3-5, Fig.1 , then use the
Button (3-5, Fig.1
Button (3-6, Fig.1
Button (3-4, Fig.1
to select the desired area size.