Heath Consultants GT Series - Manual (Page 101)

10-3
PRESSURE MODE
10.4 PREPARE INSTRUMENT (PRESSURE MODE)
Zero the instrument before tubing is attached.
To zero the instrument:
• Press and hold ZERO .
Connect the required length of tubing from the appliance
to the pressure port on the rear of the instrument, as
shown in Fig. 10.3.
Fig. 10.3 Tubing Connected to Pressure Port
You can now utilise the instrument as a manometer in
accordance with your company practice.