Installation
Sensor Location Considerations (
continued
)
Sensors used in these areas usually require
more frequent calibration checks than normal,
and typically have a shorter life.
In many
such applications the normal two year war-
ranty would not apply.
CAUTION:
General Monitors discourages the painting
of sensor assemblies. If the sensor head is
painted over, the gas will not be able to dif-
fuse into the sensor. If the assembly cover
is painted over, the digital display cannot
be read.
Remoting the Sensor from the Electronics:
If it is necessary to remotely mount the sensor
from the electronics and the housing, the
maximum distance can be no greater than 100
feet, using 14 AWG wire. Sensors that are re-
motely placed must be contained in a sensor
housing (GMI P/N 10252) and the cable run
must be contained in a conduit running from
the sensor housing to the electronics. See Ap-
pendix, section 5.4.
3.3
Installation Instructions
The overall and mounting dimensions for the
Model S104 (figures 5 & 20) should be used
when making installation determinations. A
complete list of the mechanical specifications
can be found in the Appendix (section 5.1.3).
To prevent possible corrosion due to moisture
or condensation, it is recommended that the
conduit connected to the Model S104 housing
be sealed or contain a drain loop (figure 6).
Each conduit run from a hazardous location to
a non-hazardous location should be sealed so
that gases, vapors, and/or flames can not pass
beyond the seal. The purpose of seals in a
Class I hazardous location is to prevent the
passage of gases, vapors, or flames from one
electrical installation to another through the
conduit system. However, it is not required to
add a seal to the Model S104 housing to
maintain its explosion proof integrity. Spe-
cific information on Class I location seals and
drainage can be found in the National Electric
Code handbook, Article 501-5.
6
figure 5
GENERAL MONITORS
Model S104
