Rhinomanometer NR6
NR6 User
’s
Manual V 16 14/02/2020 P24 of 34
MAINTENANCE MANUAL
CALIBRATION
A calibration check should be made, and if required the instrument adjusted, in the following
circumstances:
a)
if the pressure or flow transducers are changed
b)
if the flowhead is contaminated with dust or other particles or has been washed or
disinfected
c)
if some time has elapsed since the last calibration (ideally a check should be made
before each testing session)
d)
if there is any uncertainty about the results achieved
Two transducers are used in each NR6 - one for measuring the flow and one for measuring the
pressure. They can be set using static individual calibration units, such as a liquid column for
pressure and a rotameter for flow.
CALIBRATION EQUIPMENT
to NR6 Pressure Port
(Black)
A.
Pressure Gauge
- a liquid column
covering the range 0-500 Pa (51mm H
2
0).
It is an added convenience if this is
connected in the manner shown because
adjustment to the desired pressure level
is more easily achieved.
Hand Pump Reservoir Liquid
Column
B.
Flow Gauge
- such as a rotameter
covering the range 0-500cm3/sec.
(0-30 l/min) and an adjustable
Rotameter
source of flow with a variable
Vacuum
voltage supply. Such a motor is
Motor
Flowhead
available from manufacturers of
vacuum cleaners and the speed at
which it runs, and therefore the flow
it produces, can be controlled by
powering it from a variable transformer Variable
Transformer
to NR6
