Instruction Manual Dräger P7-TDX
36
14.4 SBV pressure
The measurement provides information on whether the SBV (safety bleed valve) pressure
is adjusted correctly. The valve upstream of the SBV must be open, the valve upstream of
the consumer closed.
The pressure downstream of the regulator (secondary side) in the gas pipeline must be
increased.
If the SBV pressure is exceeded, the SBV opens and gas is released on the secondary
side (hissing). The existing pressure (secondary side) at the time of opening is the SBV
pressure.
The SBV closes automatically if the pressure is significantly undercut.
14.5 Zero-pressure
After the SAV is triggered, the tightness is checked, to determine whether there is a con-
nection from the line side to the house installation, e.g. via a defective seal. To do so,
depressurize the line downstream of the SAV with main shut-off valve open and then,
check whether the pressure is at 0 hPa (mbar) or is slowing increasing. There can be no
pressure increase measurable downstream of the SAV.
Measurement result
Test result
Pressure 0 hPa (mbar)
zero-pressure
Pressure increases slowly
no zero-pressure (seal defective)
15. Data storage
15.1 Storing measurements
If a customer number is not selected, the dataset is stored
with the type of measurement as well as date and time.
Switch to customer number using (
▲
▼
).
Open the “Selecting and entering customer data” function
using (
SELECT
). This function enables editing the customer
data shown, selecting another customer or creating a new
customer.
Select the dataset, under which the measurement is to be
stored using (
▲
▼
). The datasets can be listed with date or
customer number.
