GxT Ferret 54 ENGINE DIAGNOSTIC CENTER - Manual (Page 20)

CALIBRATION GAS HOSE
During calibration, the calibration gas is fed
into the CAL GAS port. The calibration gas
hose comes from the regulator, which is
connected to the calibration gas bottle. The
maximum pressure from the regulator
supplied with the Diagnostic Center is
approximately 25 PSI (1700 mBars).
If no hose is connected to this port, it should
be capped with the sample hose leak test
cap to prevent contaminants from entering
the Gas Detector.
DRAIN HOSE
The drain hose channels water vapor, that
has been removed from the exhaust gas, out
of the Gas Detector system. There are holes
in the floor of the stand to allow the hose to
be routed out the bottom. For road testing,
a vented bottle is used to collect the water.
The vent is routed outside the vehicle to
prevent build up of exhaust gases that are
present in the drain output.
When the Gas Detector pumps are not
running, as in the case of the LEAK TEST,
leakage can occur through the drain hose.
If the leak check fails, retest with the drain
hose clamped.
EXHAUST HOSES
Two fittings on the Gas Detector are labeled
as exhaust hoses. One is labeled 'BENCH'
and is the outlet for most of the gas sample.
The other is labeled ‘NOx’ and is a lower flow
outlet for the remainder of the sampled gas.
Be sure all exhaust hoses are open and
unrestricted, providing free flow of the
sample gas. Restrictions in the exhaust
hoses can cause measurement errors.
The output of the exhaust ports contains CO
(carbon monoxide) and other toxic
components of automobile exhaust! Even
though the quantities are small, the same
safety precautions should be observed that
apply to automobile exhaust.
Gas Detector
2-7
O
N A
R
OAD
T
EST
VENT THE
E
XHAUST
H
OSES OUTSIDE
OF THE
V
EHICLE
!
O
NLY CONNECT THE
C
ALIBRATION
G
AS THROUGH
A REGULATOR TO THE
CAL GAS
PORT
.
U
NREGULATED BOTTLE PRESSURES CAN CAUSE
DAMAGE TO THE
G
AS
D
ETECTOR
!