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MiniO
®
Oxygen Analyzer
Sensor Operation
The oxygen sensor has a minimal response to certain
gases other than oxygen. Be aware of these gases
and their interference levels. See Section 3, Interferent
Gases and Vapors.
Figure 4-1
Sensor Mounting in a Breathing Circuit.
The sensor is a sealed unit containing a
potassium hydroxide electrolyte. If the
sensor should develop a leak, discard it
immediately. Should contact occur with skin
or clothing, rinse area with large quantities
of water. In case of eye contact, immediately
flush eyes with water for at least 15 minutes,
holding eyes open. Call a physician.
When using the sensor in a breathing circuit, mount
the sensor with the deflector pointing downward (see
Figure 4-1). This prevents moisture from draining on to
the sensor membrane (see Section 5, Maintenance and
Care).
Ensure a tight fit exists between the sensor
and the tee adapter. Ohio Medical tee
adapters are engineered to fit securely with
Ohio Medical sensors. However, the sensor
retaining strap must be used to prevent
accidental separation of the sensor and tee
adapter.
Retaining Strap Installation
To install the retaining strap:
1. Remove the coiled cable from the sensor (Figure
4-2).
All manuals and user guides at all-guides.com
WARNING
WARNING
P/N 711462 (Rev.3) 02/2016
2. Firmly insert the sensor into the tee adapter with the
deflector pointing downward; ensure a tight fit exists.
Figure 4-2
Retaining Strap Installation
3. Install one end of the strap over a post on the tee
adapter.
4. Loop the strap around the sensor, inserting the strap
center hole over the sensor cable jack.
5. Install the remaining strap end over the other tee
adapter post.
6. Attach the coiled cable to the sensor.
7. Tighten the twist collar.
The sensor is now secured in place.
Effects of Pressure, Humidity, and
Temperature
To ensure accurate and reliable oxygen
analysis, a thorough understanding of
the effects of pressure, humidity, and
temperature on the sensor is necessary.
Effects of Pressure
The sensor actually senses partial pressure of oxygen,
not percentage. Changes in barometric pressure
changes the reading, even if the percent of oxygen in
the sample remains constant.
Partial pressure of oxygen (PO
of oxygen (%,O
) times (x) the pressure at which the
2
sample is measured (mmHg-mercury):
PO
= (%O
2
For example:
At sea level the pressure equals 760 mmHg and
dry air contains 21 % O
PO
= (21%) (760 mmHg)
2
PO
= 160 mmHg
2
Section 4, Operation
CAUTION
) equals the percent
2
) (mmHg)
2
. Therefore;
2
4-2
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