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45118 参数 Datasheet PDF下载

45118图片预览
型号: 45118
PDF下载: 下载PDF文件 查看货源
内容描述: 迷你风速测试仪 [Mini Thermo-Anemometer]
分类和应用: 测试
文件页数/大小: 1 页 / 58 K
品牌: EXTECH [ EXTECH INSTRUMENTS CORPORATION. ]
   
User Manual
Model 45118
Introduction
Congratulations on your purchase of Extech’s 45118 Mini Thermo-
Anemometer. This meter is shipped fully tested and calibrated and, with
proper use, will provide years of reliable service
Mini Thermo-Anemometer
Maintenance
Battery Replacement
If the meter will not power up as usual or the display contrast becomes weak
and difficult to read, replace the lithium battery. To do so, turn the battery
compartment cover in a CLOCKWISE direction to remove it. The battery will
be visible in the battery compartment, observe the position of the battery and
replace the new one in the same position. Affix the battery compartment
cover by turning it in a COUNTER-CLOCKWISE direction. Dispose of the
lithium battery in accordance with local, state, or national waste disposal
codes.
Vane Impeller Replacement
NOTE:
The anemometer is very accurate at low and mid-range air speeds.
Constant use at very high speeds may damage the impeller’s bearing and
reduce over-all accuracy.
1.
To replace the impeller, remove the set screw next to the impeller
assembly (on the rear of the meter). Twist the impeller assembly
counter-clockwise to the "O" (open) position and remove it.
Install the new impeller by inserting and twisting the new impeller
assembly clockwise then tighten the set screw.
Vane impeller
Precision thermister
LCD display
POWER and HOLD key
UNITS and MODE key
Battery compartment (on
rear)
Swivel handle and storage
case
Lanyard holder
Impeller set screw (on rear
of meter)
Meter Description
1.
2.
3.
4.
5.
6.
7.
8.
9.
Operation
1.
Select the desired units
for air velocity and temperature by momentarily
pressing the UNITS/MODE key from a powered down condition. The LCD
will show temperature units (
o
C or
o
F) and Air Velocity units. Press the
UNITS/MODE key repeatedly until the desired units are displaying. When
finished, press the ON/OFF/HOLD key momentarily to restart the meter
with the desired units.
Power the meter
by pressing the ON/OFF/HOLD key momentarily. The
Dual Display will illuminate. The top (larger) display indicates air speed and
the lower display indicates temperature.
Position the meter
so that the measured airflow enters the meter vane
from the
rear
of the meter (opposite side from the front panel logo, part
number, etc.).
Activate Data Hold
(to freeze the most recent display), by pressing and
holding the ON/OFF/HOLD key while taking measurements. To return to
normal operation, release the key and restart the meter.
Max operation:
After a measurement session, press and hold the UNITS /
MODE key until the MAX icon appears on the lower left-hand side of the
LCD. Both the Air Velocity and Temperature indication will represent the
highest readings measured since the meter was last powered.
Average mode operation:
Normally the meter averages readings every 2
seconds. To select 5, 10 or 13 second averaging, first press and hold the
UNITS/MODE key until the MAX icon appears. Next, press the key again
momentarily and the AVG icon will appear. The 13 second average mode
is selected. Now press the key again and the number 5 will appear. Leave
it there if an average of 5 seconds is desired. Press the key once more for
a 10 second average mode. To return to normal operation press the
UNITS/MODE key repeatedly until all lower left-hand icons disappear.
Wind chill indicator:
Press and hold the UNITS/MODE key until the MAX
icon appears. Press the key repeatedly until the WCI icon appears. The
temperature display will now factor in the wind chill. To return to normal
operation, press the UNITS/MODE key again and the WCI icon will
disappear.
AUTO POWER OFF:
After approx. 20 mins, if meter keys are not touched,
the meter automatically shuts down to preserve battery life.
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.
2.
3.
Specifications
2.
Dual LCD with multifunction indicators
Knots, km/h, MPH, ft/min, m/sec, Beaufort force,
windchill, and temperature (C/F)
Wind-speed
Moving 2 second average with 2 second gust detect
Sensor
Sapphire bearing, non-corrosive vane for air velocity
and precision thermistor for temperature
Average Mode
Choice of 5, 10, or 13 second average readings
Max Display
Push button highest reading recall
Data hold
Freeze most recent display
Sample time
1 reading per second
Water-resistant
To 3’ (1 meter)
Min/Max wind-speed
1.1 to 62.5 MPH
Operating temperature 5 to 122
o
F (-15 to 50
o
C)
Operating humidity
< 80% RH
Power supply
Lithium battery type CR-2032 or equivalent
Battery life
400 hours approx.
Weight
3 oz. ( 95 g )
Dimensions
Instrument: 5.25 x 2.75 x 0.75” (133 x 70 x 19mm)
Vane: 1” ( 24mm ) diameter
2.2 Electrical Specifications
Measurement
MPH (Miles per
hour)
km/hr (kilometers
per hour)
Knots (nautical
miles per hour)
m/sec (meters
per second)
ft/min (feet per
minute)
Beaufort force
Temperature
Range
1.1 to 62.5 MPH
1.8 to 100.6 km/h
1.0 to 54.3 knots
0.50 to 28.00 m/s
100 to 5500 ft/min
1 to 17 BF
0 to 122 F
-18 to 50 C
o
o
4.
Display
Measurements
Calibration / 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.
5.
6.
CFM Measurements
Measure the area of the duct using the diagrams below for rectangular and circular ducts (If the
duct measurements are made in inches, divide the inches by 144 to get the area in square
feet). Plug the area value (in square feet) in the cubic equations below. Note that the air
velocity must be plugged into the cubic equations also.
7.
8.
Resolution
0.2 MPH
0.7 km/h
0.3 knots
0.01 m/s
20ft/min
1 BF
0.1 F
0.1 C
o
o
Accuracy
± (3%rdg +0.4MPH)
± (3%rdg +1.4km/h)
± (3%rdg +0.6knots)
± (3%rdg +0.2m/s)
± (3%rdg +40ft/min)
±1
±1.8
o
F
±1
o
C
Copyright
©
2008 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
V4.0 1/08
Warranty
CFM (ft /min) = Air Velocity (ft/min) x Area (ft )
CMM (m /min) = Air Velocity (m/sec) x Area (m ) x 60
3
2
3
2