Op era tion
Cali bra tion Equip ment
(
con tin ued
)
Use the ta ble be low to de ter mine 50% of full
scale for the dif fer ent sen sors.
Sensor Range (Type)
50% of Full Scale
0 to 100 ppm (‘-1’) 50 ppm
0 to 50 ppm (‘-5’) 25 ppm
0 to 20 ppm (‘-9’) 10 ppm
(
values given in parts per million
)
fig ure 15
4.3
Test Gas Mode
If it is de sired to check the sen sor for its re -
sponse with out send ing a gas con cen tra tion
sig nal to a re mote dis play de vice, this can be
ac com plished by plac ing the Model S214 in
the “Test Gas” mode.
The pro ce dure for check ing the cali bra tion is:
l
Place the magnet over the GMI Logo on
the cover of the Model S214. Remove the
magnet when a
flashing
pair of bars, “
-
-
”, (figure 16) appears on the display
(about three seconds).
l
Apply the test gas to the sensor and the
value of the gas concentration will be
indicated by the flashing display in two to
three minutes.
Note:
applied gas
concentration must be >10% of full scale.
l
When the reading has stabilized and the
test is complete, remove the gas and the
unit will return to normal operation when
the concentration drops below 5% of full
scale.
fig ure 16
If the Model S214 is placed in the test gas
mode and no gas is ap plied for twelve min -
utes, the unit will re vert to a fault con di tion
(see sec tion 4.5 Fault Codes & Their Reme -
dies). Re- applying the mag net over the GMI
Logo will re turn the unit to nor mal op era tion.
Dur ing a cali bra tion check, if the “test gas”
read ing has sta bi lized and is out of tol er ance,
the unit can im me di ate ly be placed in the
“cali bra tion” mode by ap ply ing the mag net to
the Gen eral Moni tors’ Logo on the lid of the
Model S214.
NOTE:
This should only be
done if a 50% full scale gas con cen tra tion was
ap plied.
13
GENERAL MONITORS
Model S214
