User manual

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Instruments with radio module 915.00MHz FSK
Warning: Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
· Reorient or relocate the receiving antenna.
· Increase the separation between the equipment and receiver.
· Connect the equipment into an outlet on a circuit different from that to which the receiver is needed.
· Consult the dealer or an experienced radio/TV technician for help.
Operation is subject to the following two conditions:
· this device may not cause harmful interference, and
· this device must accept any interference received, including interference that may cause undesired operation.
2. Intended purpose
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 635 is a compact measuring instrument for measuring temperature,
humidity and the pressure dew point.
The product was designed for the following tasks/applications:
· Measuring room climate
· Regulating and inspecting ventilation and air-conditioning installations
· Measuring the pressure dew point in compressed air systems
· Material moisture observation
The product should
not
be used in the following areas:
· Areas at risk of explosion.
· Diagnostic measurements for medical purposes.
1. Safety instructions