55 • Appendix C: Non-Standard Toxic Gas Sensors Eagle Instruction Manual
Description
Non-standard toxic gas sensors are mounted in the front half of the
instrument case. These sensors each include a dedicated amplifier
with ZERO and SPAN controls. A bracket secures the sensor/
amplifier assembly to the instrument case. A flow adapter connected
to the sensor allows the sample to flow through the non-standard
toxic gas sensor. A seven-position connector plugs into the EC3
(channel 3) or EC4 (channel 4) socket on the analog PCB.
CAUTION:Some Eagles equipped with non-standard toxic gas sensors
include a special plastic inlet fitting that requires a Teflon
sample hose. The standard hose with metal fittings cannot be
used with these Eagles. Using a standard sample hose for these
applications will result in inaccurate gas readings for the toxic
gases. Gases that require the plastic inlet fitting and Teflon
sample hose include ozone, hydrogen fluoride, hydrogen
chloride, and chlorine dioxide.
Keeping Fresh Batteries in a Non-Standard Toxic Eagle
The non-standard toxic sensors require a bias voltage to be applied to
them at all times, even when the Eagle is turned off, to maintain
proper operation. This bias voltage is maintained even when the Eagle
is turned off as long as the batteries in the Eagle have enough voltage
to operate the Eagle (4.5 volts or greater). Once the batteries are
drained to the point that they will not operate the Eagle, they will no
longer provide a reliable bias voltage to the non-standard toxic
sensors. When the Eagle indicates a dead battery alarm, change the
batteries as soon as possible to maintain the bias voltage.
If the Eagle is stored for an extended period, check the battery voltage
periodically by turning on the Eagle and scrolling through Display
Ozone 0 to 1.00 ppm 0.10 ppm 0.30 ppm 0.08 ppm 0.10 ppm
Phosphine 0 to 1.00 ppm 0.10 ppm 0.30 ppm 0.30 ppm 1.00 ppm
Silane 0 to 15.0 ppm 2.0 ppm 5.0 ppm 5.0 ppm 5.0 ppm
Sulfur dioxide 0 to 10.0 ppm 1.0 ppm 2.0 ppm 2.0 ppm 5.0 ppm
Sulfur dioxide 0 to 15 ppm 1.0 ppm 2.0 ppm 2.0 ppm 5.0 ppm
1 ppb (parts per billion)
Table 8: Non-Standard Toxic Gas Sensors Specifications
Target Gas Range Alarm 1 Alarm 2
TWA
Alarm
STEL
Alarm
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