ALPHA OMEGA INSTRUMENTS CORP.
OXY-SEN OXYGEN MONITOR
Instruction Manual
SECTION 4.0
OPERATING PROCEDURES
Power On:
Power to the OXY-SEN is applied whenever the instrument is plugged into an AC outlet.
Gas System Pressure Limits
It is imperative that the sample gas pressure to the sensor be kept to under
1 pound per
square inch
. There is no automatic pressure correction so operation at a constant pressure will
provide optimum measuring conditions. Vacuums to 12.5 psia are permissible. Any vacuum
level greater than that should be avoided as it will cause irreparable damage to the sensor.
Range Operation
The OXY-SEN Oxygen Monitor operates with two (2) different analog signal output ranges 0-
25% and 0-100%. Selection of the range of operation is done by plugging the monitor's output
cable into one of the two connectors. The connector on the far right labeled “100%”
automatically selects the 0-100% range; selecting the connector to the immediate left labeled
“25%” will provide the 4-20 mADC output over 0-25%.
If the 25% output range is selected,
the OXY-SEN will still measure and display oxygen values up to 100%
Sample Connections
The standard OXY-SEN oxygen sensor is designed to be threaded into a hole prepared to
accept a M16X1 thread. As such, there are no conventional gas connections to be made.
Typical applications for the OXY-SEN include glove boxes, reactor vessels, chambers, etc.,
where such threaded holes can be made quite easily. Once the sensor has been properly
installed and the “O” ring properly seated, then the other end of the sensor cable, may be
connected to the bottom of the electronics labeled "Sensor". Alpha Omega Instruments does
offer an optional “T” like flow through gas housing for the OXY-SEN. If this option has been
ordered, the housing will be equipped with quick connect fittings on both the gas inlet and outlet.
These fittings are designed for use with 1/4” OD plastic tubing. The housing may also be
ordered with compression fittings.
Analog Outputs
The OXY-SEN Oxygen Monitor may be equipped with optional analog outputs for use with a
recorder, datalogger, etc., which is a powered 4-20 ma loop output. This output scale is
determined by the range connection selected. The interface cable supplied with the Monitor can
be plugged into the connector labeled "25%" or "100%" on the bottom of the electronics
enclosure. The cable connector location information can be found in Figure 1.0, and the cable
pin-outs in Figure 2.0.
Storage of the Monitor
When the OXY-SEN Oxygen Monitor is not in use, it may be stored in any position. If stored in
an atmosphere where the temperature is greatly different from the temperature where it will be
used, the instrument should be allowed to come into equilibrium with the operating ambient
temperature before use. Under
no circumstances
should the OXY-SEN Oxygen Monitor or its
sensor be exposed to temperatures below 40°F (5° C) or above 104 °F (40° C). Doing so will
damage the sensor and void the warranty.
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