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C.A 824
■ Thermo-anémomètre à hélice
■ Rotating Vane Thermo-anemometer
■ Flûgelradanemometer + Thermometer
■ Termoanemometro ad elica
■ Termoanemómetro de hélice
FRANÇAIS
ENGLISH
DEUTSCH
ITALIANO
ESPAÑOL
Notice de fonctionnement
User's manual
Bedienungsanleitung
Libretto d'Istruzioni
Manual de Instrucciones
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CONTENTS
1. CONTROLS PRESENTATION ......................................... 9
2. OPERATING ................................................................... 10
3. SPECIFIC FUNCTIONS ................................................. 10
4. SPECIFICATIONS .......................................................... 11
5. MAINTENANCE ............................................................. 12
6. TO ORDER ..................................................................... 13
1. CONTROLS PRESENTATION
1. Menu selection / menu scrolling button
2. MIN / MAX function activation button
3. Validation button
4. ON / OFF and escape function button
5. Measurement freezing button
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2. OPERATING
2.1 Language selection
When the device is off, keep the OK button pressed and then
press the ON / OFF button.
Press HOLD to validate English or press SELECT to validate
French.
2.2 Measurement procedure
1. Activate the device by pressing the ON / OFF button.
2. Choose the desired measurement unit for temperature and
air velocity (See Menu).
3. Choose the variable to be measured: air velocity and
temperature or air flow (see Menu).
4. Place the probe in the correct air flow direction. For more
accurate results, try to keep the axis of the vane within 20°
of the air flow direction.
5. Wait a few seconds for the measurements to stabilise.
6. If necessary, freeze the display by pressing HOLD.
3. SPECIFIC FUNCTIONS
3.1 Choosing the measurement units
Press SELECT to enter the menu.
Scroll down the menu with SELECT.
When UNITS appears, enter with OK.
Scroll down the air velocity measurements units by pressing
SELECT.
Press OK to validate your choice.
Proceed the same way with the temperature measurements
units.
3.2 Making an average calculation
Press SELECT to enter the menu.
Scroll down the menu with SELECT.
When AVERAGE appears, enter with OK.
To start the average calculation press OK.
Press OK again to stop the calculation. The result is displayed
on the screen.
To start another calculation, proceed the same way.
To escape the function, press "ON / OFF / ESC".
3.3 Making an air flow calculation
Press SELECT to enter the menu.
Scroll down the menu with SELECT.
When FLOW appears, enter with OK.
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Choose the type of duct: RECT. for rectangular or CIRC. for
circular with SELECT and validate with OK.
Choose the dimensions unit (mm or in) with SELECT and validate
with OK.
Enter the length of the duct in the case of a rectangular duct:
modify each of the 4 digits with SELECT and validate with OK.
Proceed the same way with the width or the diameter in the
case of circular duct.
The measurement is displayed on the screen.
To modify the measurement unit once in the FLOW function,
follow the measurement unit choice procedure above.
To escape the FLOW function, press ON / OFF / ESC.
3.4 Making an air flow calculation with the C.A 825 cone
This function is available only if you possess an air flow
measurement cone C.A 825. Otherwise refer to paragraph 3.3
Making air flow calculation
Press SELECT to enter the menu.
Scroll down the menu with SELECT.
When C.A 825 CONE appears, enter with OK.
The air flow is immediately displayed.
For a measurement in supply, insert the vane in the cone with
the arrow (on the top of the vane) turned toward the outside of
the cone.
For a measurement in exhaust, insert the vane in the cone with
the arrow turned toward the inside of the cone.
3.5 Minimum and maximum values
For air velocity, press MIN / MAX one time to display the v alues
min "m" and max "M".
Press a second time to display the values for temperature.
To escape this function, press ON / OFF / ESC.
3.6 Freezing the measurement
To freeze the measurement on the screen, press HOLD.
To escape, press HOLD again.
4. SPECIFICATIONS
Metrological specifications
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Measurement range Resoluti on Acc uracy Measurement unit s
Air veloc i t y
0.20 to 3 m/s
3.1 to 35 m/s
0.01 m/s
0.1 m/s
± 3% R + 0.1 m/ s
± 3% R + 0.2 m/ s
m/s , fpm
Ambient
temperature
-20 to +80°C 0.1°C ± 2% R + 0.2 °C °C, °F, K
Air flow 0 to 65 000 m
3
/h 1 m3/h ± 3% R + 10 m3/h m3/h, m3/s, L/s, cfm
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Technical features
Conditions of use: 0 to 50°C; < 85 %RH
neutral gas
Storage conditions: 0 to 50°C; 15 to 85 %RH
Power supply: 1 alkaline battery, 9V 6LR6
Device shuts off automatically after 30 minutes
Dimensions and weight
Instrument: 145 x 75 x 34 mm
Cable: L = 450 mm, extension up to 2.4 m
Probe: Ø = 100 mm, L = 310 mm
Display: 2 lines of 12 characters
38 x 12 mm
Weight: 190 g
Conformity
Electromagnetic Compatibility: complies with NF EN 61326-1.
5. MAINTENANCE
5.1 Cleaning
Clean the casing with a cloth and a little soapy water.
Clean off with a damp cloth.
5.2 Changing battery
- Remove the protective covering
- Remove the battery cover
- Insert a 9V battery
- Replace the battery cover
- Replace the protective covering
5.3 Metrologic verification
It is essential that all measuring instruments are regularly
calibrated.
For checking and calibration of your instrument, please contact
our accredited laboratories (list on request) or the CHAUVIN
ARNOUX subsidiary or your local agent.
5.4. Repairs
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■■
■ Repairs under guarantee and outside guarantee.
Please return the product to your distributor.
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6. TO ORDER
C.A 824 ................................................................ P 01.1731.03
Accessories:
Telescopic extension .......................................... P 01.1020.12
Air flow measurement cone C.A 825 .................. P 01.1731.05
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