Measuring; Measuring Differential Temperature - TESTO 325M Instruction Manual

7. Measuring

18
Measuring draught
Delta P
1 Select in the main menu
via .
2 Select required pressure range:
Delta P1
( 0 to 40hPa) or
3 Confirm selection via
- The analyser starts zeroing (duration: 5s),
display .
4 Once the zeroing phase is complete, insert the flue gas probe
pipe in the flue gas duct.
- The selected pressure range and the current reading are
displayed .
5 End measurement via
- The last reading is retained in the analyser until the next
draught measurement.
Measuring gas flow pressure
Gas flow pressure is measured in the same way as draught is
measured. Please note the following:
The silicone hoses from the pressure set should only be
connected to the gas heater after the zeroing phase.

7.3 Measuring differential temperature

Use this function to measure the flow and return temperature in
heating systems.
You will need 2 pipe clamp probes (Part no. 0628 0020)
for the measurement.
1 Connect probes to analyser.
Delta t
2 Select in the main menu
via .
The temperature at the FT socket (T1) is shown in the top
reading line.
The temperature at the AT socket (T2) is shown in the bottom
reading line.
3 End measurement with
- The last reading is retained in the analyser until the next
differential temperature measurement.
and confirm selection
Delta P2
(0 to 200hPa)
.
CAL
.
and confirm selection
.
.
lights up in the