Using The Product; Preparing Measurement - TESTO 523 Instruction Manual

Using the product

8
Using the product

Preparing measurement

Connecting t t emperature p p robe:
For the measurement of the line temperature and the automatic calculation
of super-heating and sub-cooling, a Pt100 temperature probe (accessory)
must be connected.
Probes must be connected before switching the instrument on, in order for
them to be recognized.
Open the socket cover on the left-hand side of the instrument.
1
Plug the connection plug of the temperature probe into the probe socket.
2
Depending on the measurement task, position the probe at the end of the
3
evaporator (Superheat) or condenser (Sub-cooling).
Switching i i nstrument o o n:
Press .
Zeroing p p ressure s s ensors:
Carry out a zeroing of the pressure sensors before each measurement.
The measurement values can be falsified by a change in the position of
the measuring instrument. After zeroing, the position of the measuring
instrument must not be changed. Carry out zeroing before every measure-
ment in order to compensate faulty positioning or long-term zero-point
drift. Zeroing is only possible in a range of ±1bar (rel) / ±14.5psi (rel) and
0...2bar (abs) / ±29psi (abs) resprectively.
The connections on the low and high pressure sides must be depres-
surized (ambient pressure).
Press function button Set.
1
- p=0 flashes.
Press OK to carry out zeroing.
2
Connecting r r efigerant h h oses:
The valve knobs are closed.
Connect refrigerant hoses for low pressure side (blue) and high pressure
1
side (red) to the instrument.
Connect refrigerant hoses to the system.
2