Naris
Naris
User’s
Manual V14 14/02/20 Page 42 of 52
a)
Switch on the instrument and allow 5 minutes warm-up time
b)
Select calibration from the setup menu bar item. Zero the output
c)
Apply a flow of 300cm3/S (18 litres/minute) to the flowhead and if the value shown on
the screen is not correct, adjust the flow calibration potentiometer, marked VR2 inside
the NR6 until the reading is correct
d)
Remove the flow and check that the value returns to zero. If it does not, reset the zero
position, apply the flow and, if necessary, re-adjust the flow calibration potentiometer,
VR
2
e)
Apply a pressure of 300 Pa (31mm H
2
0) to the black input nozzle and, if the value on
the screen does not read 300, adjust the potentiometer VR
5
inside the NR6 until it does
read correctly
f)
Remove the pressure and check that the value returns to zero. If it does not, reset the
zero position, re-apply the pressure and, if necessary, make a further adjustment of the
pressure calibration potentiometer
MAINTENANCE
The routine maintenance which is required is as follows:
a)
Regularly check the condition of the
pneumotachograph
which is mounted on the
mask and the condition of the plastic tubes which connect the mask to the
instrument. The pneumotachograph should be kept clean, as dust build-up on the
gauze will result in incorrect results. The gauze, mask, tip connectors and tubes can
be washed, subjected to sterilising solution and can be gas sterilised, but must be
thoroughly dried out prior to making measurements -
they cannot be autoclaved
.
The tubing should not be used if it kinks or if it becomes slack on the
pneumotachograph or instrument connector tubes. It should be replaced by a new
length.
b)
Conditions of various instrument-to-PC interconnecting cables should be checked
regularly to look for damage to insulation.
c)
Should the
enclosure require cleaning
for any reason, unplug it from the PC and
wipe it with a damp cloth, or a cloth soaked in a mild alcohol based solution or
cleaning wipes. Do not allow liquid to run into the enclosure.
