6 Using the product
13
Pos: 28 /TD/Übersc hriften/6. Produkt verwenden @ 0\mod_11737749 28554_79.docx @ 328 @ 1 @ 1
6 Using the product
Pos: 29 /TD/Produk t verwenden/testo 557/An schließen, nulle n, einstellen 5502 @ 17\mo d_1423131416357_79.doc x @ 207307 @ 235355355 @ 1
6.1. Preparing for measurement
6.1.1. Switching the instrument on
> Press [].
Zeroing the pressure sensors
Zero the pressure sensors before every measurement.
✓ There must be ambient pressure at all connections. >.
> Press for 3 seconds key [P=0] and execute zeroing.
6.1.2. Connecting the temperature sensor
Sensors must be connected before the measuring
instrument is switched on, so that they are recognised by
the instrument.
Surface temperature sensor
An NTC temperature sensor (accessory) must be connected for
measuring the pipe temperature and for automatic calculation of
superheating and subcooling.
Deactivating the surface compensation factor for insertion and
air temperature sensor
A surface compensation factor has been set in the measuring
instrument to reduce the measuring errors in the main field of
applications. This reduces measuring errors when using surface
temperature sensors.
If the measuring instrument testo 550 is used in combination with
insertion or air temperature sensors (accessories), this factor must
be deactivated:
1. Press [Set] repeatedly until T
fac
is displayed.
2. Press [▲] or [▼] to set T
fac
to Off.
3. Press [Set] to continue through the settings menu until the
measurement/home view is displayed.
- T
fac
is shown on the display if T
fac
is disabled.
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