179 • Bump Testing GX-2012s and Gas Tracers
the Configuration” on page 32 for instructions.
3.
Verify that the appropriate calibration gas cylinder(s) are connected to the
appropriate SDM-2012(s) or manifold line(s). The ppm sensor will be bump
tested first. Be sure that a 6 inch humidifier tube is used to connect the ppm
calibration cylinder to the GAS 2 fitting on the back of any SDM-2012(s) with
Gas Tracers installed. If you have assembled a humidifier manifold for the
GAS 2 fittings of the SDM-2012s with Gas Tracers installed (see “Assembling
a Manifold for Multiple SDM-2012 Units” on page 15), be sure the ppm
calibration cylinder is connected to the inlet of the manifold. If you are using a
zero air cylinder for the fresh air adjustment, install a 6 inch humidifier tube
between the regulator and the AIR fitting on the back of the SDM-2012.
NOTE:
Do not use a 4-gas cylinder or any cylinder that includes H
2
S when
bump testing a Gas Tracer. H
2
S adversely affects the ppm combustible
sensor. If you have assembled a manifold, be sure that one manifold
exists for the SDM-2012s with GX-2012s installed and that a separate
manifold exists for the SDM-2012s with Gas Tracers installed.
4.
Ensure that the gas out to instrument line is connected to the inlet of each
instrument and that the exhaust line is connected to the exhaust fitting of the
each instrument.