Extech Instruments 407412 Manual de usuario

User's Manual

Hygro Thermo-Anemometer

Model 407412

Model 407412 May 2001 Rev. 1.6

WARRANTY

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited

warranty applies on sensors and cables). If it should become necessary to return the

instrument for service during or beyond the warranty period, contact the Customer

Service Department at (781) 890-7440 for authorization. A Return Authorization (RA)

number must be issued before any product is returned to Extech. The sender is

responsible for shipping charges, freight, insurance and proper packaging to prevent

damage in transit. This warranty does not apply to defects resulting from action of the

user such as misuse, improper wiring, operation outside of specification, improper

maintenance or repair, or unauthorized modification. Extech specifically disclaims any

implied warranties or merchantability or fitness for a specific purpose and will not be

liable for any direct, indirect, incidental or consequential damages. Extech's total liability

is limited to repair or replacement of the product. The warranty set forth above is

inclusive and no other warranty, whether written or oral, is expressed or implied.

Introduction

Congratulations on your purchase of Extech's Hygro Thermo-Anemometer. This Heavy

Duty meter measures and displays Air Velocity + Temperature and Relative Humidity +

Temperature. Air flow can be displayed in the following units of measure: feet per minute,

meters per second, miles per hour, kilometers per hour, and knots. Temperature and RH

units are displayed in oC/oF and % units respectively. Careful use of this meter will provide

years of reliable service.

Specifications

General Specifications

Display Dual function, 3-1/2 digit (2000 count) LCD display

Units of measure m/s (meters per second), km/hr (kilometers per hour), ft/min (feet per

minute), knots (nautical miles per hour), mile/hr (miles per hour);

Temperature: °C/°F; Humidity: %RH

Data hold Holds reading on the LCD display when button is pressed

Sensors Air velocity sensor: Twisted vane arm with low friction ball bearing;

Temperature: Precision thermistor; Humidity: Thin film capacitor

Max/Min Record Records highest and lowest readings for later recall

Data Output RS-232 serial PC interface

Operating Temp. 32°F to 122°F (0°C to 50°C)

Operating Humidity Max. 80% RH.

Power Supply 9V battery

Power Consumption Approx. 8.3 mA DC

Weight 0.77 lbs. (350g)

Dimensions Meter: 7.1x2.8x1.3" (180 x 72 x 32mm);

Anemometer Probe: 0.7" (17mm) Diameter x 6.7" (170mm)

Accessories Anemometer/temperature and RH Probes, 9V battery, & case

Model 407412 May 2001 Rev. 1.6

(rear)

Vane

RH Probe head

Probe

Plugs

Handles

Probe head

9 10

Range Specifications

Air velocity

Measurement Range Resolution Accuracy

ft/min 80-4930 ft/min 1 ft/min ±(2% + 20ft/min)

m/s 0.4 -25.0 m/s 0.1 m/s

km/hr 1.4 -90.0 km/hr 0.1 km/hr

mile/hr 0.9-55.9 mile/hr 0.1 mile/hr

knots 0.8 -48.6 knots 0.1 knots

±(2% +2digits)

Temperature

Range Resolution Accuracy

32oF to 122oF / 0oC to 50oC / 0.1oC/oF±1.5oF / ±0.8oC

Relative Humidity

Range Resolution Accuracy

10 to 70% RH 0.1% ±3% RH

70 to 95% RH 0.1% ±4% RH

Meter Description

1. LCD Display

2. POWER button

3. Data Hold button

4. °C/°F Selection button

5. Function switch

6. Data Record button

7. Data Recall button

8. Units select button

9. RS-232 output jack

10. Probe input socket

11. Battery compartment

Model 407412 May 2001 Rev. 1.6

airflow

Yellow

Dot

Anemometer and Temperature Operation

1. Insert the Vane sensor into the meter's input jack at the top of the meter.

2. Press the POWER button to turn the instrument on.

3. Select 'Anemometer' operation by placing the function slider switch to the vane icon.

4. Select the temperature units by pressing the °C/°F button. The LCD display will

indicate '°C' or '°F' as selected.

5. Select the air velocity unit of measure by pressing the

UNIT button. With each press the display scrolls

through the units (m/s, km/hr, ft/min, knots, & mile/h).

6. Hold the probe by its handle and position the vane so

that the yellow dot is on the exhaust side of the vane.

The meter will then indicate Air Velocity + Temperature

(See diagram at right).

Relative Humidity and Temperature Operation

1. Insert the Relative Humidity probe in the input jack at the top of the meter.

2. Press the POWER button to turn on the instrument.

3. Select the Humidity mode of operation by placing the function slider switch to the

%RH position.

4. Select the temperature units by pressing the °C/°F button. The LCD display will

indicate '°C' or '°F' as selected.

5. Hold the probe by the handle and point it in the area to be measured. The meter will

display Relative Humidity + Temperature.

6. Note that humidity measurements take several minutes to stabilize.

Data Hold

Press the DATA HOLD button to freeze the displayed reading. The DH icon will appear on

the LCD while Data Hold is engaged. Press the DATA HOLD button again to resume

normal operation.

Min/Max Record Mode

When selected, the Record mode stores the highest (Max) and lowest (Min) readings for

later recall. To use Record mode:

1. Press the RECORD button. The REC indicator will appear on the LCD display.

2. Start a measurement session.

3. After the measurement session, press the RECALL button to view the highest (Max)

reading recorded since the RECORD button was pressed. The MAX indicator will

appear to inform the user that the displayed reading is the highest value recorded.

4. Press the RECALL button again to view the lowest reading encountered since the

RECORD key was pressed (the MIN indicator will appear on the LCD to inform the

user that the reading displayed is the lowest value recorded).

5. Press RECORD again to return the meter to normal operation. All stored data will be

cleared and the REC/MIN/MAX icons will disappear from the LCD.

6. Note that putting the meter into the Record mode defeats the Auto Power Off feature.

Model 407412 May 2001 Rev. 1.6

RS-232 PC Interface

The RS-232 serial data port (3.5mm phono jack) is located at the top of the meter next to

the sensor input jack. The PC interface hardware is intended for use with the Extech Data

Acquisition software package, Part Number 407001 which includes Windows

95 / 98 /

ME / NT / 2000 compatible softw are and PC interface cable. For more information, contact

Extech or refer to the 407001 User's Manual.

Auto Power Off feature

The Auto Power Off feature automatically turns the meter off after approximately 10

minutes. To defeat this feature, place the meter in Record mode by pressing the RECORD

key once (the REC icon will appear on the LCD). The meter will remain powered as long

as the meter is in the RECORD mode.

Battery Replacement

When it is time to replace the 9V battery, the low battery indicator (LBT) appears in the left-

hand corner of the LCD display. Note that reliable readings can be obtained for several

hours after the first appearance of the low battery indicator.

To replace the battery:

1. Remove the meter's protective rubber holster.

2. Pry off the battery compartment cover on the rear of the meter using a small coin or

screwdriver.

3. Replace the 9V batter and reinstall the compartment cover and holster.

Relative Humidity Calibration

1. Turn the meter on and select the Humidity mode using the slide switch.

2. Use a simulator to apply 0.0 ºC to the meter and adjust VR3 for a display of 0.0 ºC.

3. Change the input to 25.0 ºC and adjust VR1 for a display of 25.0 ºC.

4. Change the input to 50.0 ºC and verify a display of 50.0 ºC. Readjust VR3 & VR1 if

necessary.

5. Connect the humidity probe to the unit and place the probe in a controlled 33% RH

environment. Let stabilize for a minimum of 30 minutes and adjust VR5 for a reading of

33.0% RH.

6. Place the probe in a 75% RH environment for a minimum of 30 minutes and adjust “R6

for a reading of 75.0% RH.

7. Verify that the temperature reading is within the published specifications. If not, perform

calibration steps 2 and 3, above, again.

Model 407412 May 2001 Rev. 1.6

(

Tech Support Hotlines

781-890-7440 ext. 200

[email protected]

www.extech.com

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell.

For periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

Model 407412 May 2001 Rev. 1.6

Appendix

Conversion Table

to convert to multiply

by to convert

to multiply

feet/minute cms/sec 0.508 knots feet/hr 6,080

feet/minute feet/sec 0.01667 knots kilometers/hr 1.8532

feet/minute kms/hr 0.01829 knots nautical miles/hr 1

feet/minute meters/min 0.3048 knots statute miles/hr 1.151

feet/minute miles/hr 0.01136 mph cms/sec 44.7

meters/sec feet/min 196.8 mph feet/min 88

meters/sec feet/sec 3.281 mph feet/min 88

meters/sec kilometers/hr 3.6 mph feet/sec 1.467

meters/sec kilometers/min 0.06 mph kms/hr 1.609

meters/sec miles/hr 2.237 mph kms/min 0.02682

meters/sec miles/min 0.03728 mph knots 0.8648

kilometers/hr cms/sec 27.78 mph meters/min 26.82

kilometers/hr feet/min 54.68 mph miles/min 0.1667

kilometers/hr feet/sec 0.9113

kilometers/hr knots 0.5396

kilometers/hr meters/min 16.67

kilometers/h miles/hr 0.6214

Area Equations

Cubic equations

CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)

CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

Area = W x H

Rectangular Duct

Circular Duct

Area = 2 π

(A=2x3.14xRxR)

Tabla de contenidos

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