0024-9551
Revision 1
53
PCA
®
400 User Manual
IMPORTANT
:
The CO
LOW
sensor also measures H
2
for the purpose of compensating
the CO reading for the presence of H
2
in the gas sample. This procedure first spans
the CO
LOW
sensor and, optionally, spans the H
2
part of the sensor to know gas levels.
Fig. 5-7:
Gas Sensor Calibration Equipment
L
eave
T
op
p
orT
o
pen
*
Part of Calibration Kit
(P/N: 0024-7059)
Regulator*
3
⁄
16
" I.D. Tubing*
Gas Cylinder
Gas Connector*
Materials / Equipment Required
Before manually calibrating the CO
LOW
sensor, obtain the following items:
Calibration Kit
(P/N: 0024-7059)
Gas Cylinder
(500 ppm CO in air, P/N: 0024-0492)
Gas Cylinder
(1,000 ppm CO and 1,000 ppm H
2
in Nitrogen, P/N: 0024-0794)
5.6.2 CO
LOW
Sensor Calibration