Alpha Omega Instruments OXY-SEN Operating Manual

OXY-SEN

OXYGEN MONITOR

Alpha Omega Instruments Corp.

0 Albion Road, Suite 100

4
Lincoln, RI 02865
Phone: [phone]
Fax: [phone]
Website: www.aoi-corp.com
Email: [e-mail]

VERSION 2.2 COPYRIGHT 06/18
ALPHA OMEGA INSTRUMENTS CORP. ALL
RIGHTS RESERVED INCLUDING THE RIGHT TO
REPRODUCE THIS MANUAL, OR ANY PORTION
THEREOF, IN ANY FORM.

ALPHA OMEGA INSTRUMENTS CORP.
OXY-SEN OXYGEN MONITOR Instruction Manual

WARRANTY

Alpha Omega Instruments Corp. warrants the OXY-SEN Oxygen Monitor delivered to be free
from defects in material and workmanship at the time of delivery to the FOB point specified in
the purchase order, its liability under this warranty being limited to repairing or replacing, at
Alpha Omega Instruments option, items which are returned to it prepaid within one year from
the date of shipment and found to Seller’s satisfaction to be defective.

Alpha Omega Instruments one (1) year sensor warranty offers protection for one full year from
the date of shipment of the OXY-SEN Oxygen Monitor. Any sensor from an OXY-SEN Oxygen
Monitor that fails under normal use must be returned to Seller prepaid and, if such sensor is
determined by Seller to be defective, Seller shall provide Buyer a replacement sensor. Buyer
must provide the serial number of the monitor from which the sensor has been removed. If a
sensor is found to be defective and a new one issued, the warranty of the replacement sensor
(s) is for a period of one year from the date of shipment. At times, it may be necessary to ship a
replacement sensor in advance of receiving one returned for warranty claim. In such cases, if
the returned sensor is not covered under warranty, the user will be charged the full price of a
replacement sensor. In no event shall Alpha Omega Instruments Corp. be liable for

consequential damages. NO PRODUCT IS WARRANTED AS BEING FIT FOR A
PARTICULAR PURPOSE AND THERE IS NO WARRANTY OF MERCHANTABILITY.

This warranty applies only if:

(i) the items are used solely under the operating conditions and manner

recommended in this manual, specifications, or other literature;

(ii) the items have not been misused or abused in any manner or repairs attempted

thereon;

(iii) written notice of the failure within the warranty period is forwarded to Alpha

Omega Instruments Corp. and, the directions received for properly identifying
items returned under warranty are followed;

(iv) the return notice authorizes Alpha Omega Instruments Corp. to examine and

disassemble returned products to the extent the Company deems necessary to
ascertain the cause of failure.

The warranties stated herein are exclusive. THERE ARE NO OTHER WARRANTIES, EITHER
EXPRESSED OR IMPLIED, BEYOND THOSE SET FORTH HEREIN, and Alpha Omega
Instruments Corp. does not assume any other obligation or liability in connection with the sale or
use of said products.

Disclaimer of Warranty

lpha Omega Instruments Corp. makes no representation or warranties, either expressed or

A
implied, by or with respect to anything in this manual, including, but not limited to, implied
warranties of merchantability or fitness for a particular purpose. In no event will Alpha Omega
Instruments Corp. be liable for any damages, whether direct or indirect, special, consequential, or
incidental arising from the use of this manual. Some states in the USA do not allow the exclusion
of incidental or consequential damages. Alpha Omega Instruments Corp. also reserves the right
to make any changes to improve the performance of its products at any time and without notice

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ALPHA OMEGA INSTRUMENTS CORP.
OXY-SEN OXYGEN MONITOR Instruction Manual

TABLE OF CONTENTS

PAGE

WARRANTY i

SECTION 1.0 SPECIFICATIONS 1

SECTION 2.0 SYSTEM DESCRIPTION 2

SECTION 3.0 INSTALLATION PROCEDURES 3

SECTION 4.0 OPERATING PROCEDURES 4

SECTION 5.0 CALIBRATION PROCEDURES 5

SECTION 6.0 REPLACEMENT OF OXYGEN SENSOR 6

FIGURE 1.0 OXY-SEN OXYGEN MONITOR DIMENSIONAL DRAWING 7

FIGURE 2.0 OXY-SEN OXYGEN MONITOR ANALOG INTERFACE CABLE 8

APPENDIX A MSDS FOR THE 2SEN OXYGEN SENSOR 9

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ALPHA OMEGA INSTRUMENTS CORP.
OXY-SEN OXYGEN MONITOR Instruction Manual

SECTION 1.0

SPECIFICATIONS

PERFORMANCE
Measurement Range: 0-100% oxygen (gas phase)

Measurement Error: ±1% of full scale (at 77°F and 29.92” Hg)

Linearity: ±1% of full scale

Response Time: 90% of full scale in under 30 seconds

Sensor Type: Long-life ambient temperature electrochemical

Temperature Compensation: Standard

Operating Temperature Range: 40° to 104°F (5° to 40°C)

Warranty: 12 months (both sensor and electronics)

ELECTRICAL
Display: 3-1/2 digit liquid crystal

Input Power: 115/230 VAC, 50-60Hz or 24 VDC

Analog Output (Optional): 4-20 mADC scaled over 0-100% O2 and 0-25%

O2(selectable by connector position).

AMPLE GAS CHARACTERISTICS

S
Storage Temperature Range: 40° to 104°F (5° to 40°C)

Sample Gas Pressure Limits: < 2 psig (0.14 kg/cm2)

CONSTRUCTION
Dimensions of Electronics Enclosure: 5-3/4 in.(146.05 mm) Width

5-1/2 in.(139.70 mm) Height
1-1/4 in.(31.75 mm) Depth

Note: All dimensions are without optional equipment

Dimensions of Sensor: 1.85 in.(47 mm) Height

0.9 in.(22.86 mm) Depth

Thread depth: 0.29 in.(7.34 mm) (exclusive of O-ring)

Thread size: M16 X 1

Weight (with 10’ of sensor cable): < 2 pounds (<0.907 kg)

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ALPHA OMEGA INSTRUMENTS CORP.
OXY-SEN OXYGEN MONITOR Instruction Manual

SECTION 2.0

SYSTEM DESCRIPTION

General Description

The OXY-SEN Oxygen Monitor is a percent oxygen monitor designed to provide accurate and
dependable percent oxygen measurements in a variety of gases. The monitor enclosure is
made from aluminum, and is rated for general purpose service. The monitor is powered from
115 VAC, 208/240 VAC (auto-adjusts to input voltage) or 24 VDC (must be selected at time of
order).

Ambient Temperature Electrochemical Sensor with EES

The OXY-SEN Oxygen Monitor features an extended life oxygen sensor with EES (enhanced
electrolyte system) a weak acid electrolyte system. The weak acid electrolyte system retards
passivation of the sensor anode by allowing the products of oxidation to dissolve in the acid
electrolyte. In effect, the sensor is renewed continuously as the weak acid electrolyte tolerates
over 20 times the lead oxide (PbO) than potassium hydroxide (KOH) based sensors. The result
is a sensor with a greatly extended useful life.

The extended life sensor is a lead-oxygen battery comprised of a lead anode, a gold cathode,
and a weak acid electrolyte. A gold electrode is bonded onto a non-porous Teflon (FEP)
membrane. A small amount of oxygen permeating through the membrane is reduced
electrochemically at the gold electrode. A resistor and a thermistor (for temperature
compensation) are connected between the cathode and anode. As a result, the lead-oxygen
battery is always discharged.

Current flowing through the resistor and thermistor is proportional to the oxygen concentration of
the gas in contact with the Teflon membrane. By measuring the voltage between the resistor
and the thermistor, oxygen concentration can be accurately determined. The two electrode
reactions are depicted below:

Cathode: O2 + 4H+ + 4e 2H2O

node: 2Pb + 2H2O 2PbO + 4H+ + 4e

A

Overall: O2 + 2Pb 2PbO

If PbO generated at the anode remains on the anode, the anode's potential will change and the
output voltage of the sensor would become extremely low. However, in actuality the surface of
the lead anode is continuously renewed because PbO is dissolved back into the electrolyte.
There is a maximum level to the solubility of PbO in the weak acid electrolyte. As a result, when
the electrolyte becomes saturated with PbO, the sensitivity of the sensor will begin to drop
signaling time for replacement of the sensor. When the extended life oxygen sensor is used in
ambient air monitoring applications, carbon dioxide (CO2) that is present will not adversely affect
the sensor's performance. Due to the weak acid electrolyte, CO2 will not react with the
electrolyte to form potassium carbonate as it does with KOH based sensors. As a result, there
is no loss in output due to the presence of CO2.

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