3 Product-specific information
5
Product-specific information
• Do not carry out measurements on live components.
• Do not expose handles and feed lines to temperatures in excess of 70°C
unless they are expressly approved for higher temperatures. Temperature
specifications on probes/sensors refer only to the measuring range of the
sensor system.
• Only open the measuring instrument if this is expressly described in the
documentation for the purposes of maintenance or servicing.
Intended use
The testo 425 is a compact instrument for measuring flow velocities and
temperatures by means of a permanently connected flow/temperature probe
(hot wire probe). It is intended for indoor use only.
The product is designed for the following tasks/areas:
• Volume flow measurements in ducts
• Measuring flow velocities in rooms
• Temperature measurement of flows
The product should not be used in the following areas:
• In potentially explosive atmospheres.
• For diagnostic measurements in the medical field.
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