425 - Anemometer Testo - Free user manual and instructions

USER MANUAL 425 Testo

testo 425 Thermal anemometerGeneral notes18 General notes This chapter provides important advice on using this documentation. The documentation contains information that must be applied if the product is to be used safely and efficiently. Please read this documentation through carefully and familiarise yourself with the operation of the product before putting it to use. Keep this document to hand so that you can refer to it when necessary. Identification Representation Meaning Comments Note Offers helpful tips and information. , 1, 2 Objective Denotes the objective that is to be achieved via the steps described. Where steps are numbered, you must always follow the order given! Condition A condition that must be met if an action is to be carried out as described. >, 1, 2, ... Step Carry out steps. Where steps are numbered, you must always follow the order given! Text Display text Text appears on the instrument display. Button Control button Press the button. - Result Denotes the result of a previous step. Cross -reference Refers to more extensive or detailed information.1. Safety advice 19

This chapter gives general rules which must be followed and observed if the product is to be handled safely. Avoid personal injury/damage to equipment > Do not use the measuring instrument and probes to measure on or near live parts. > Never store the measuring instrument/probes together with solvents and do not use any desiccants. Product safety/preserving warranty claims > Operate the measuring instrument only within the parameters specified in the Technical data. > Always use the measuring instrument properly and for its intended purpose. Do not use force. > Do not expose handles and feed lines to temperatures in excess of 70 °C unless they are expressly permitted for higher temperatures. Temperatures given on probes / sensors relate only to the measuring range of the sensors. > Open the instrument only when this is expressly described in the documentation for maintenance and repair purposes. Carry out only the maintenance and repair work that is described in the documentation. Follow the prescribed steps when doing so. For safety reasons, use only original spare parts from Testo. Ensure correct disposal > Take faulty rechargeable batteries/spent batteries to the collection points provided for them. > Send the product back to Testo at the end of its useful life. We will ensure that it is disposed of in an environmentally friendly manner. deenfresitptsvnl????2. Intended purpose20

This chapter gives the areas of application for which the product is intended. Use the product only for those applications for which it was designed. Ask Testo if you are in any doubt. testo 425 is a compact instrument for measuring flow velocities and temperatures by means of a permanently connected flow/temperature probe (hot wire probe). The product was designed for the following tasks/ applications:

• Measuring volumetric flow rates in ducts

• Measuring flow velocities in rooms

• Measuring the temperature of flows The product should not be used in the following areas:

• Areas at risk of explosion.

• Diagnostic measurements for medical purposes3. Production description 21

3. Product description

This chapter provides an overview of the components of the product and their functions.

3.1 Display and control

elements Overview Probe Display Control buttons Battery compartment (rear) Service compartment (rear) Button functions Button Functions Switch instrument on; switch instrument off (press and hold) Switch display light on / off Keep reading, display maximum/minimum value Open/leave configuration mode (press and hold); In configuration mode: Confirm input In configuration mode: Increase value, select option In configuration mode: Reduce value, select option Multi-point and timed mean calculation Volumetric flow deenfresitptsvnl????3. Production description22 Important displays Display Meaning Battery capacity (bottom right in display):

• 4 segments in the battery symbol are lit: Instrument battery is fully charged

• No segments in the battery symbol are lit: Battery is almost spent

Voltage is supplied by means of a 9V monobloc battery (included in delivery) or rechargeable battery. It is not possible to run the instrument from the mains supply or charge a rechargeable battery in the instrument.4. Commissioning 23

This chapter describes the steps required to commission the product. Inserting a battery/rechargeable battery: 1 To open the battery compartment on the rear of the instrument, push the lid of the battery compartment in the direction of the arrow and remove it. 2 Insert a battery/rechargeable battery (9V monobloc). Observe the polarity! 3 To close the battery compartment, replace the lid of the battery compartment in position and push it against the direction of the arrow. deenfresitptsvnl????5. Operation24

This chapter describes the steps that have to be executed frequently when using the product.

5.1 Connecting a probe

The necessary probes are permanently connected or integrated. It is not possible to connect any additional probes.

5.2 Switching the instrument

on / off Switching the instrument on: > Press . - The thermal sensor is heated up (5s). - Measurement view is opened: The current reading is displayed, or ----- lights up if no reading is available. Switching the instrument off: > Press and hold (for approx. 2s) until the display goes out.

5.3 Switching the display

light on / off Switching the display light on/off: The instrument is switched on. > Press .5. Operation 25

5.4 Performing settings

1 To open configuration mode: The instrument is switched on and is in measurement view. Hold, Max or Min are not activated. > Press and hold (for approx. 2s) until the display changes. - The instrument is now in configuration mode. You can change to the next function with . You can leave configuration mode at any time. To do so, press and hold (for approx. 2s) until the instrument has changed to measurement view. Any changes that have already been made in configuration mode will be saved. 2 To set the area: Configuration mode is opened, AREA is lit. > Set the cross-sectional area with / and confirm with . 3 To set the absolute pressure: The absolute pressure is required for the pressure compensation of the flow velocity measurement value. The absolute pressure must be measured using a separate instrument or obtained from the local weather station. Configuration mode is opened, HPA or InHG is lit. > Set the absolute pressure with / and confirm with . deenfresitptsvnl????5. Operation26 4 To set Auto Off: Configuration mode is opened, AutoOff is flashing. > Select the desired option with / and confirm with :

• on: The measuring instrument switches off automatically if no button is pressed for 10min (Hold or Auto Hold is lit).

• oFF: The measuring instrument does not switch itself off automatically. 5 To set the unit of measurement: Configuration mode is opened, UNIT is lit. 1 With / set the required unit for the top line (m/s, fpm) and confirm with . 2 With / set the required unit for the bottom line (m

/h, l/s, cfm) and confirm with . 6 To reset: Configuration mode is opened, RESET is lit. > Select the desired option with / and confirm with :

• no: Instrument is not reset.

• Yes: Instrument is reset. The instrument is reset to the factory settings. - The instrument returns to measurement view.6. Measuring 27

This chapter describes the steps that are required to perform measurements with the product. Taking a measurement: The instrument is switched on and is in measurement view. > Put the probe in position. The arrow mark on the probe head must point in the direction of flow. The correct measurement value is determined by rotating the probe slightly in both directions until the maximum value is displayed. - Read off the readings. Changing the measurement channel display: > To change between displaying the temperature (°C, °F) and the calculated volumetric flow rate (m

/h, l/s, cfm): Press . deenfresitptsvnl????6. Measuring28 Holding the reading, displaying the maximum/minimum value: The current reading can be recorded. The maximum and minimum values (since the instrument was last switched on) can be displayed. > Press several times until the desired value is displayed. - The following are displayed in turn:

• Hold: the recorded reading

• The current reading Resetting the maximum/minimum values: The maximum/minimum values of all channels can be reset to the current reading. 1 Press several times until Max or Min lights up. 2 Press and hold (approx. 2s). - All maximum or minimum values are reset to the current reading. Performing a multi-point mean calculation: Hold, Max or Min are not activated. 1 Press . - Mean is lit. - The number of readings recorded is displayed in the upper line, while the current reading is displayed in the lower line. Option: > To change between displaying the temperature (°C, °F), flow velocity (m/s, fpm) and calculated volumetric flow rate (m

/h, l/s, cfm): Press . 2 To include readings (in the desired quantity): Press (several times).6. Measuring 29

To end measurement and calculate the mean value: Press

- Mean flashes. The calculated spot mean value is displayed. 4 To return to measurement view: Press . Performing a mean calculation in time: Hold, Max or Min are not activated. 1 Press twice. - Mean is lit. - The elapsed measuring time (mm:ss) is displayed in the upper line, while the current reading is displayed in the lower line. Option: > To change between displaying the temperature (°C, °F), flow velocity (m/s, fpm), and calculated volumetric flow rate (m

/h, l/s, cfm): Press . 2 To start measurement: Press . 3 To interrupt/continue measurement: Press each time. 4 To end measurement and calculate the mean value: Press . - Mean flashes. The calculated mean value in time is displayed. 5 To return to measurement view: Press . deenfresitptsvnl????7. Care and maintenance30

7. Care and maintenance

This chapter describes the steps that help to maintain the functionality of the product and extend its service life. Cleaning the housing: > Clean the housing with a moist cloth (soap suds) if it is dirty. Do not use aggressive cleaning agents or solvents! Changing the battery/rechargeable battery: The instrument is switched off. 1 To open the battery compartment on the rear of the instrument, push the lid of the battery compartment in the direction of the arrow and remove it. 2 Remove the spent battery/rechargeable battery and insert a new battery/rechargeable battery (9 V monobloc). Observe the polarity! 3 To close the battery compartment, replace the lid of the battery compartment in position and push it against the direction of the arrow.8. Questions and answers 31

8. Questions and answers

This chapter gives answers to frequently asked questions. Question Possible causes Possible solution is lit (bottom right · Instrument battery is · Replace instrument in display). almost spent. battery. Instrument switches · Auto Off function · Switch function off. itself off automatically. is switched on.

• Residual capacity · Replace battery. of battery is too low. Display: ----- · Probe break. · Please contact your dealer or Testo Customer Service. Display reacts slowly · Ambient temperature · Raise ambient is very low. temperature. Display: uuuuu · Permitted measuring · Keep to permitted range was undershot. measuring range. Display: ooooo · Permitted measuring · Keep to permitted range was exceeded. measuring range. If we are unable to answer your question, please contact your dealer or Testo Customer Service. For contact data, see back of this document or web page www.testo.com/ service-contact deenfresitptsvnl????9. Technical data32

Accuracy ±0.03 m/s+5% of reading (±1 Digit) ±0.5 °C / ±0.9 °F (0...+60.0 °C / +32...+140 °F) ±0.7 °C / ±1.3 °F (rest of range) Probe Telescopic flow velocity/temperature probe (hot wire probe) with NTC temperature sensor (permanently connected) Measuring rate 2/s Operating temperature range -20...+50 °C / -4...+122 °F Storage temperature -40...+85 °C / -40...+185 °F Voltage supply 1x 9 V monobloc battery/rech. battery Battery life approx. 20 h Protection class with TopSafe (accessory part): IP 65 EC Directive 2004/108/EEC Warranty 2 years

10. Accessories/spare

parts Name Part no. TopSafe testo 425, protects from impact and dirt particles 0516 0221 For a complete list of all accessories and spare parts, please refer to the product catalogues and brochures or look up our website: www.testo.comSommaire Recommandations générales .............................34