Extech Instruments AN400 User manual

User's Guide
Cup Thermo-Anemometer
Model AN400

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Introduction
Congratulations on your purchase of the Extech Cup Thermo-Anemometer. The AN400
measures air velocity in five units of measure: feet per minute (ft/min), meters per
second (m/sec), miles per hour (MPH), kilometers per hour (km/hr), & nautical miles per
hour (knots). The low-friction cup vane freely rotates in response to air flow. An internal
thermistor allows the AN400 to measure air temperature in Centigrade or Fahrenheit
units. This meter is shipped fully tested and calibrated and with proper use will provide
years of reliable service.
Meter Description
1. Cup vane
2. Temperature sensor
3. POWER: On/Off
Logger: Store data with “REC” in display
▲: Step through and recall stored data
4. HOLD: Freeze display
Unit: Select measured units
5. REC: Enter Max/Min or Logger mode
oC/oF: Select measured units
▼: Step through and recall stored data
6. LCD display
7. Battery compartment cap

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Operation
Connecting the Vane Cup
1. Place the cup vane on the top of the meter housing.
2. Rotate the top screw in a counter-clockwise direction
until the screw is secured.
Meter Power
1. Press the POWER button to turn the meter on. If the display does not switch on, check
that four AAA batteries are installed. To access the battery compartment, remove the
battery cover by rotating it in a counter-clockwise direction.
2. Press the POWER button to turn the meter off.
3. The meter is equipped with an AUTO POWER OFF feature. The meter automatically
shuts off after 10 minutes to conserve battery energy. To disable this feature, press the
REC button to enable the MIN/MAX function.
Measuring Air Velocity and Temperature
1. Hold the meter vertically and place the cup sensor in the air stream under test.
2. Read the Air Velocity and Temperature measurements directly on the LCD display.
Note: The temperature sensor is located in the upper right of the front panel. To avoid
affecting the temperature reading, hold the lower portion of the meter when making
measurements.
Selecting the Temperature unit of measure (oC/oF)
Press and Hold (>2 seconds) the REC/oC/oF key to toggle the temperature unit of
measure. The display will indicate the currently selected unit of measure.
Note: Temperature unit of measure cannot be changed if the Data Hold or Record function
is on.
Selecting the Air Velocity unit of measure
To change the unit of measure for Air Velocity measurement, press and hold (>2 seconds)
the HOLD/Unit button. The display will sequence through the measurement units. When
the desired unit of measure is displayed, release the button. The current setting will be
retained even after the meter is powered off.
Note: Unit of Measure cannot be changed if the Data Hold or Record function is on.
Data Hold
To freeze the LCD display, momentarily press the HOLD button. The 'HOLD' icon will
appear on the LCD and the reading will remain unchanged. Momentarily press the HOLD
button again to return to normal operation (the 'HOLD' icon will switch off).

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Record and Recall MIN / MAX Function
1. To begin capturing the Minimum (MIN) and Maximum (MAX) air velocity and
temperature readings, momentarily press the REC key. The “REC” icon will be
displayed.
2. Now, use the REC button to toggle the view from MIN to MAX and from MAX to MIN
readings. The ‘RECMAX’ or ‘REC MIN’ will appear along with the recalled reading for
convenience.
3. To delete the maximum or minimum value and record a new value, momentarily press
the HOLD button while in either “RECMAX’ or “REC MIN” mode.
4. To return to normal operation, press and hold the REC button until the “REC”, ‘MAX’,
and ‘MIN’ icons switch off.
Datalogging
Datalogging allows the user to store and recall up to 100 readings with the press of a button.
1. Momentarily press the REC button to display the “REC” icon in the display.
2. Press the Logger button to manually store a single reading into memory.
The location number of the reading will appear in the main display
(memory locations remaining will appear in the lower display) for 2
seconds and then the normal display will return.
3. To exit the datalogger, press and hold the REC button for >2 seconds. The
“REC” icon will disappear.
4. To recall the stored data, momentarily press the HOLD button to display the “HOLD”
icon.
5. Momentarily press the REC button to display the total number of data
points stored in memory. “ttL” will also appear in the lower display.
6. Use the ▲and ▼buttons to scroll through the memory locations to view
the logged readings. The “units” display will flash while in the recall mode.
7. The memory location will first appear in the display followed by the reading.
8. To exit the recall data function, press the momentarily HOLD button.
Note: The selected “unit of measure” icon will flash continuously when the meter is in recall
mode.
Clearing Stored Data
1. Press and hold the REC button while turning the meter on to clear memory.
2. The LCD will indicate “n” in the main display and “CLr” in the lower display.
3. Momentarily press the ▼button to display “Y” and “CLr”.
4. Press the HOLD/Unit button. When the LCD indicates “nuLL” and “CLr”, the memory
has been cleared.

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
Support line [phone]
Technical support: Extension 200; E-mail: [email protected]m
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
Maintenance
Battery Replacement
The AN400 is powered by four 1.5V AAA batteries. When the low battery icon
appears on the LCD or if the display does not switch on when the POWER button is
pressed, replace or install the batteries.
1. Twist off the battery compartment cap by rotating it counter-clockwise.
2. Replace the four AAA batteries observing polarity.
3. Replace the battery compartment cap.
Cleaning and Storage
Wipe the meter and vane with a damp cloth as needed. Do not apply abrasive, solvents, or
other cleaners to the surface of the meter or vane. Store with the battery removed and
avoid extreme temperature and humidity.
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
[phone] ext. 210 for authorization or visit our website at www.extech.com for contact
information. 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.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information on
calibration services available for this product. Extech recommends that annual calibrations be
performed to verify meter performance and accuracy.
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Specifications
Circuit description Custom LSI microprocessor design
Display Dual function 9999 count LCD display
Measurement units m/s, km/h, ft/min, knots, mph, Temperature oC/oF
Data hold Freezes reading on the display
Sensor Structure Air velocity sensor: Cup vane arm with low-friction ball-
bearing design. Temperature sensor: Precision thermistor
Memory Recall Record and Recall Maximum (MAX) and Minimum (MIN)
readings
Data Logger Manual store/recall of up to 100 data points
Auto Power off After 10 minutes
Sampling Time Approx. 1 second
Water Resistance IP65
Operating Temperature 32 °F to 122 °F (0 °C to 50 °C)
Operating Humidity Max. 80% RH
Power Supply 4 x 1.5V AAA batteries
Power Consumption Approx. 6.8mA DC (typical battery life: approx. 150 hrs)
Weight 0.4 lbs. (181g)
Dimensions Main instrument: 7.5 x 1.6 x1.3” (190 x 40 x 32mm)
Cup Vane: 5.3” (135mm) diameter
Air Velocity Range Specifications
Measurement Range Resolution
A
ccuracy
(of full scale)
ft/min (feet per minute) 144 – 6895 ft/min 1 ft/min ± (2% + 40 ft/min)
m/s (meters per second) 0.9- 35.0 m/s 0.1 m/s ± (2% + 0.2 m/sec)
km/h (kilometers per hour) 2.5 - 126.0 km/h 0.1 km/h ± (2% + 0.8 km/hr)
mph (miles per hour) 1.6 - 78.2 mph 0.1 mph ± (2% + 0.4 mph)
knots (nautical miles per hour) 1.4 to 68.0 knots 0.1 knots ± (2% + 0.4 knots)
Temperature Range Specifications
Range Resolution Accuracy
32oF to 122oF (0oC to 50oC) 0.1oF (0.1oC) ± 1.5oF (0.8oC)
Copyright ©2006 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.