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Extech Instruments HD350, Руководство пользователя

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Extech Instruments HD350 Скачать руководство пользователя страница 10

HD350-EU-EN V3.1   07/13 

10 

Air Flow (Volume) Measurements 

1. Press 

the 

P/V/F 

button to enter the Air Flow (Volume) mode (FLOW will appear on the LCD).

The Primary display area will show the Air Flow measurement.

2. Use the UNIT 

▼

button to select the desired unit of measure (CMM or CFM).

3. To view the currently programmed duct area and shape:

Press 

the 

P/V/F

 button three more times to access the duct size/dimensions display. The

duct shape selection (rectangle or circle) will appear on the lower left-hand area of the LCD
and the Area value will be shown above it.

For Circular ducts, the Diameter (D) of the duct will be shown.

For Rectangular ducts, the Width value (W) will be shown first; press the P/V/F button again
to switch to the Height (H) value display.

Note that the Meter stores/displays the last duct shape and size programmed by the user.
To change the duct size and/or shape refer to the earlier SETUP MODE section.

Press 

the 

P/V/F

 button again to return to the AIR FLOW screen.

4. Now take an air velocity measurement as described in the previous section on Air Velocity

(ignoring the unit of measure discussions). The meter will display Air Flow (Volume) in Cubic
Feet per Minute (CFM) or Cubic Meters per Minute. The meter calculates Air Volume (Flow) by
measuring Air Velocity and taking into account the area of the duct.

Ambient Temperature Measurements 

The Secondary display area (top right of LCD) indicates the ambient temperature sensed by the 
thermometer located at the top middle of the meter (between the two pressure connection posts). 

To change the displayed unit of measure for Temperature, use the 

F/C 

▲

button. 

The only instances where the Secondary display area will not indicate temperature are when the 
meter is in the SETUP mode or when the Elapsed Timer is shown. 

Additional Functions 

Data Hold 

1. Press 

the 

HOLD ZERO

 button to freeze the presently displayed reading on the display. The

display will show the HOLD icon while in the Data Hold mode.

2. Press 

the 

HOLD ZERO 

button again to exit the Data Hold mode and return the meter’s display

to real time operation.

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Содержание HD350

Страница 1: ...User Guide Heavy Duty Pitot Tube Anemometer and Differential Pressure Manometer Model HD350 netzerotools com netzerotools com netzerotools com Extech HD350 Pitot Tube Anemometer Differential Manometer ...

Страница 2: ... Flow volume Manometer Differential Pressure Measurements Simultaneous display of Air Flow or Air Velocity Temperature and Pressure 5 selectable pressure units of measure Record up to ninety nine 99 readings in meter s internal memory for each of the three measurement types Air Velocity Air Flow and Pressure for a total of 297 readings USB port for connection to a Personal Computer PC for real tim...

Страница 3: ...ta Recall mode REC SETUP Momentary key presses turn the backlight on and off Press and hold this button for 3 seconds to enter or exit the Setup mode discussed later in this guide 10 Lower Keypad MAX MIN Press to record and store the highest lowest and continuous moving average readings for single point measurements Press and hold this button to exit this function SAVE CLEAR Press to store a readi...

Страница 4: ...er Off mode indicator 8 Low battery indicator 9 Duct Shape indicator 10 Data Hold indicator 11 Height Width rectangular duct or Diameter circular duct 12 Setup mode indicator 13 CLEAR icon appears as data is deleted from the meter s internal memory 14 Reading sample number 15 Memory indicator 16 REC MAX MIN and AVG indicators 17 Temperature units for the primary display 18 Units of measure for air...

Страница 5: ... the measurement parameters to use the others will be hidden Type Type 1 show Pressure and Velocity Type 2 show Velocity and Flow Type 3 show all measurement types Auto Power Off Sleep mode SLEEP ON or OFF Delete Stored readings ALL Use the SAVE CLEAR button to choose the reading type s to delete Select CLEAR to delete Entering or Exiting Setup Press and hold the SETUP button for 2 seconds to ente...

Страница 6: ...ontinuing from Step 8 above Skip to Step 18 for Circular ducts For rectangular air ducts the W icon duct width will appear The display will show DECI decimal at the top and a 5 digit number directly below The 5 digit number is used to program the duct s width 10 Use the arrow keys to move the decimal to the desired position 11 Press the SAVE CLEAR button to move the display cursor to the right mos...

Страница 7: ... show Pressure and Velocity measurements Type 2 show Air Velocity and Air Flow measurements Type 3 show all measurement types The steps below outline the configuration process 1 Press and hold the SETUP button for two 2 seconds to enter the Setup mode The SETUP display icon will appear 2 Use the arrow keys to scroll to the TYPE display 3 Press the AVG REC button and the display will show 1 2 or 3 ...

Страница 8: ... will appear 2 Use the arrow keys to scroll to the ALL display 3 Press the AVG REC button and the display will show YES or NO at the top of the LCD 4 Use the arrow keys to select YES 5 Under the YES display the measurement functions are listed in smaller digits PRESS VEL FLOW Use the SAVE CLEAR button to select the measurement types to delete 6 Press the AVG REC button to clear the selected readin...

Страница 9: ...e INPUT port and the REF port The meter will now display a positive pressure reading if the INPUT pressure is greater than REF and a negative reading if REF is greater than INPUT Air Velocity Speed Measurements 1 Press the PVF button to select the Air Velocity measurement mode the VEL display icon will appear on the LCD 2 Use the UNIT button to select the desired measurement unit m s ft min km h M...

Страница 10: ...n to the AIR FLOW screen 4 Now take an air velocity measurement as described in the previous section on Air Velocity ignoring the unit of measure discussions The meter will display Air Flow Volume in Cubic Feet per Minute CFM or Cubic Meters per Minute The meter calculates Air Volume Flow by measuring Air Velocity and taking into account the area of the duct Ambient Temperature Measurements The Se...

Страница 11: ...d the AVG REC button to enter the REC Recall mode and begin recalling the stored readings 3 Use the arrow keys to scroll through the stored readings The reading sample number is shown at the bottom right hand corner of the display 4 To show an average of all of the stored readings press the AVG REC button while in the Recall REC mode 5 Use the P V F button at any time during the Recall process to ...

Страница 12: ...eries disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle USB PC Interface and Software The HD350 is equipped with a USB communication jack on its upper lef...

Страница 13: ...ghest and average readings Auto Power OFF Automatic shut off after 20 minutes can be disengaged PC Interface USB PC Communication with supplied software and cable for data acquisition Low battery indication Battery symbol appears on the LCD Power supply 9V Battery Operating conditions 0 to 50 o C 32 to 122 o F Storage conditions 10 to 60 o C 14 to 140 o F Relative Humidity Non condensing 10 o C 90...

Страница 14: ...9ft 3 min 0 0001 to 100 CMM cubic meters per minute 0 to 99 999m 3 min 0 001 to 100 Manometer Specifications Accuracy 0 3 F S Full Scale at 25 o C Repeatability 0 2 Max 0 5 F S Linearity Hysteresis 0 29 F S Pressure Range 5000 Pa Maximum Pressure 10psi Response Time 0 5 Seconds typical Range Indicator Over range Err 1 Under range Err 2 Units Range Resolution PSI 0 7252 0 0001 mbar 50 00 0 01 inH2O...

Страница 15: ...angle Area A Height b x Width a Circle Area A x r2 Where 3 14 and r2 radius x radius Cubic equations CFM ft 3 min Air Velocity ft min x Area ft 2 CMM m 3 min Air Velocity m sec x Area m 2 x 60 NOTE Measurements made in inches must be converted to feet or meters a b r netzerotools com netzerotools com ...

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