Table of Contents
Advertisement
where:
N
is the actual, or true, number concentration (
a
ber concentration (
cm
(1.0 cc/sec), and
τ
is the residence time of particles in the scattering volume (2.0
det
From the equation above and the parameter values given, the coincidence error at 10,000
3
cm
is 2% and increases to 18% at 100,000
Note: Saved concentration data have NOT been corrected for coinci-
dence.
5.3 Component Technical Descriptions
The BRECHTEL mini-OPC system includes three separate components.
Component 1 mini-OPC main assembly (body, detector board, main board, pump
all integrated to 'U' bracket mount)
Component 2 A front panel display connected by ribbon cable to the main board.
Component 3 A ship kit with weatherproof case, power supply, cables and other
items to operate the unit.
83-00032-01
5.3 Component Technical Descriptions
N
N
N
e
=
a
i
3
),
Q
is the volumetric flow rate through the scattering volume
det
cm
mini-OPC 9405
Q
τ
a
det
det
3
cm
),
N
is the measured num-
i
3
.
Figure 3: Major compo-
nents of the mini-OPC.
(1)
μ
sec).
Page 11 of 39
Advertisement
Table of Contents
