Dwyer AFH2 Manuel d'utilisateur Page 15
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
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The capture hood can be used on either supply or exhaust flows. Which
of these factors you will use depends on where in the duct you wish to
measure the air flow rate. Press the UNITS key until L/s, m
3
/hr or cfm
appears on the right-hand-side of the display. Use the Up and Down
arrow keys to toggle between the Hood Supply and Hood Exhaust
factors, which are shown in the top line of the display.
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The Air Terminal Device Factors consist of the following factors: Hood
Supply Factor, Hood Exhaust Factor, Pitot Tube Factor, Low Volume
Supply Factor, and the Low Volume Exhaust Factor. It is not
recommended that one change these factors permanently. If for any
reason you do and need to set them back to the default, the default
factors are as follows:
Hood Supply Factor
Hood Exhaust Factor
Pitot Tube Factor
Low Volume Hood Supply
Low Volume Exhaust Factor
174.0
200.0
1.000
60.0
70.0
The instrument can store up to 2 Pitot Tube factors. These can be input
via the User Menu. In order to select a Pitot Tube factor, press the MENU
key while in measurement mode, scroll to Select Pitot Factor using the
Up and Down arrow keys and press the ENTER key. Use the Up and
Down arrow keys to select the desired Pitot Tube factor and press the
ENTER key. Press the MENU key to return to measurement mode.
Press the UNITS key until m/s or ft/min is displayed on the right-hand-
side of the screen. The selected Pitot Tube factor will be displayed in the
top line of the display on the left-hand-side.
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Select the duct shape and input the dimensions in millimeters or inches.
When storing the data manually in m/sec or ft/min, the display shows the
average value. The resulting value is then multiplied with the area to give
the volume (providing that the stored value is of the same units). The
resulting figure will either be in liters/sec or CFM depending on the
model.
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PC Connection: Connect the RS232 Plug to the instrument located
between pressure parts and fit 9-way “D” type connector to the serial
port of the PC. Ensure that the software is loaded on the PC using the
provided diskette. Switch on the instrument and select PC Connection
mode via the Menu (See the Option Menu section). Double click the icon
(under the heading “Manometer Up Load”). Message will appear on the
screen to give it a file name and save that file in appropriate location.
Ensure that the file is saved under the TXT format. Click on the file and
open with the Note Pad program and the data will be displayed in the
format:
Time Date Measured Unit of
Stamp Stamp Value Measurement
8=/Only use genuine cable and software. If any other accessories are
used or the incorrect downloading software is used then the instrument’s
warranty becomes null and void.
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When using the capture hood, it can slightly restrict the flow coming out
of the diffuser causing some back pressure on the system. This added
resistance may alter the true air flow, however in most cases this error is
likely to be less than the accuracy of the instrument.
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Some simple routine maintenance after each use will ensure that your
instrument/capture hood will function correctly for many years.
• Remove any moisture droplets using a clean, absorbent cloth/paper
before disassembling and storing the unit.
• Remove battery if the unit is to be stored, unused for an extended
period of time.
• Always store and transport the unit carefully. Store in dry conditions.
• DO NOT immerse the instrument in water.
• DO NOT use abrasive cleaning products. Bellmouth molding manifold
and hood can be wiped clean with a damp cloth and dried.
• DO NOT immerse the bellmouth in water.
• DO NOT use abrasive cleaning products, which may block or damage
the manifold grid. Grid may be CAREFULLY wiped clean with a
cloth. Ensure Pitot tube holes are not contaminated with moisture.
• DO NOT use abrasive cleaning products that may damage the grid, or
may leave a residue in or around the holes.
• DO NOT attempt to remove the grid from the bellmouth molding.
• CHECK periodically for damage or any visible cracks.
• Take care NOT to damage or obscure the calibrated holes in the tubes.
This can seriously affect the measurements obtained.
Capture hood fabric can be wiped clean with a damp cloth, if necessary,
and moisture droplets dried with an absorbent cloth/paper. Periodically,
wash in cool water using a mild detergent. Drip dry, ensuring it cannot
become caught on any sharp objects.
The fabric used is impermeable, tough, and very resistant under normal
use. In the event that the fabric becomes worn or torn, replace the fabric
hood immediately. A damaged hood will seriously affect the
measurements taken.
Anti-static solution can be applied to the instrument by using a clean, lint-
free cloth and carefully rubbing it over the instrument case and window.
8=/ This is normally only necessary when working in low-humidity
conditions.
Upon final installation of the Model AFH2 Air Flow Hood, no routine
maintenance is required. A periodic check of system calibration is
recommended. The Model AFH2 is not field serviceable and should be
returned if repair is needed (field repair should not be attempted and
may void warranty). Be sure to include a brief description of the problem
plus any relevant application notes. Contact customer service to receive
a return goods authorization number before shipping.
Page 15
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No Display on
Switch On
Instrument Stops Working
(no display on LCD)
Inconsistent Measurements
Data Not Downloaded to
Computer
!8<<3,5/+></<
• No batteries fitted
• Batteries fitted but have incorrect
orientation (wrong polarity)
• Batteries exhausted
The Unit may not be switched on. Make
sure it did not automatically turn itself off
if it is set on automatic turn-off mode.
Low Battery
• Computer is connected incorrectly
• Computer is configured incorrectly
• Incorrect printer cable is being used
• If none of these issues are causing
your problem, please contact Dwyer.
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