© 2014 All rights reserved. Data subject to change without notice.
25
Rev. E | 2014.10
GEM-II - Operation Manual
6.1.6 Wiring Example 6 (J2 Removed)
120 VAC
24 VAC
Wiring Example 6
24 VAC
GND
Controller
GEM-II
Rectified
SIGNAL
GND
24 VDC
6.2 sensor Mounting Heights
GAS
APPLICATIONS / TYPES
SUGGESTED MOUNTING HEIGHT
Carbon Monoxide (CO)
Gas engine exhaust
4 - 6 ft from the floor
Nitric Oxide (NO)
Diesel engine exhaust
Nitrogen Dioxide (NO
2
) Diesel engine exhaust
Sulphur Dioxide (SO
2
)
All
6” from the floor
Combustibles
Propane (C
3
H
8
)
Methane (CH
4
)
on or near ceiling (within 12”)
Hydrogen (H
2
)
Refrigerants
All
6: fromthe floor or near likely spot for
leakage
NOTE:
CETCI considers 4 - 6 ft from the floor as the “Breathing Zone” when it applies to sensors
installed for vehicle exhaust applications.
