Intended Purpose - TESTO 521 Instruction Manual

2. Intended purpose 7

2. Intended purpose
Employ the instruments for the following applications only:
The testo 521 and testo 526 instruments are handheld pressure-measuring instru-
ments that were developed specifically for use in air conditioning / ventilation equipment,
thermal engineering, automotive engineering and industrial plant engineering. The main
areas of use and measuring applications are:
testo 521
Air conditioning/ventilation, clean rooms and OPs:
Pressure ranges 0 to 100 hPa/0...2,5hPa, Pitot tube measurement, volume flow calcula-
tion, pressure drop on filters, fans, ...
testo 526
Industrial pressure measurement:
Pressure ranges 0 to 2000 hPa, pressure in compressed air systems, leaks in pipes &
lines, pressure drop, vacuum
Both instruments offer the following features:
- Measurement location management
- Data management via testo ComSoft software (from Version 3)
- "on-site" printout of the measured results via the testo printer
- Temperature measurement
- Wide range of probes and sensors can be connected so that one instrument covers
as many measuring tasks as possible
Location conditions
Changes in the location and temperature of the instrument and pressure probes have an
effect on the measurement results. Bring the instrument and probes into a stable positi-
on before any measurement.
Do not change this position during measurement.
Do not subject the housing to mechanical strains during measurement.
Media compatibility
testo 521/526:
Permitted medium: air and non-aggressive gases
External low pressure probes 0638 1347, 0638 1447, 0638 1547, 0638 1647, 0638
1747: Permitted medium: air and non-aggressive gases
External high-pressure probes 0638 1741, 0638 1841, 0638 1941, 0638 2041, 0638
2141: Permitted medium: refrigerant, oil, water, air and non-corrosive gases