STABILITY, ADJUSTMENT AND VERIFICATION
18
OPERATING STABILITY
CIP10
(or
CIP10 M
) do not need any external control or adjustment. In fact it
has a remarkable flowrate stability.
The constant flow rate, linearly related to the rotating cup’s rotation speed, is
assured by keeping this speed constant by regulating the motor’s supply volt-
age within ± 0.5%.
Moreover, the mechanisms for capturing particles (impact on polyurethane
foam fibers and centrifuging) do not generate variations due to loss of capaci-
ty during sampling.
The pores in the foam are several hundreds of microns in size and still remain
largely open, without noticeable clogging until the dust reaches about 50 mg
in the rotating cup and several hundreds of milligrams in the selector for alveo-
lar respirable dust.
ADJUSTING AND CHECKING THE FLOW RATE
MEASURING AND ADJUSTING THE FLOW RATE
The flow rate is the only adjustment to be made on the
CIP10
(or
CIP10 M
):
!
10 L/min for the
CIP10 R
or
CIP10 MR
and
CIP10 I
or
CIP10 M
I
!
7 L/min for the
CIP10 T
or
CIP10 MT
For each version it’s done using a potentiometer placed inside the case.
Calibration requires a pressure loss compensation calibration bench, including:
!
a sealed enclosure mounted
on the instrument’s head
and equipped
with an air input
and a static pressure tap
!
a precision flow rate meter
calibrated in the range from
5 to 12 L/min with
a resolution
of 0.1 L/min.
!
a precision manometer
between 0 and 150 Pa
with a resolution of 1 Pa
!
a non-pulsed compressed
air supply
