The cornerstone feature of the Series 1300 Oxygen Deficiency Monitor is its extended life electrochemical sensor with optimized Enhanced Electrolyte System (EES). As a result of EES, Alpha Omega Instruments is able to offer an unparalleled four (4) year sensor warranty. The standard measuring range of the monitor is 0-30% with a readout resolution to the nearest tenth of a percent. Alpha Omega Instruments’ exclusive Advanced Digital Interface (ADI) offers the capability to expand the Series 1300 with up to three oxygen sensors. Adding oxygen sensors and/or optional horn and strobe alarms in the field takes just a few minutes. For multi-point monitoring requirements, equipping the Series 1300 with three oxygen sensors reduces the per-point price to around $1,000. The Series 1300 also features a powerful built-in data logger so time-stamped oxygen values can be captured and stored for subsequent use with a variety of spreadsheet programs.
Greetings. Today, we are going to illustrate how to calibrate the Alpha Omega Instruments Series 1300. The Series 1300 requires very little routine maintenance. However, like any oxygen monitor used to help protect personnel, it’s a good idea to occasionally check the instrument’s calibration. First, let’s prepare the monitor.
Be sure the Series 1300 has been securely mounted in a fixed vertical position with power OFF for approximately 15 minutes. Then, remove these six screws from the front cover and set the cover off to the side.
Although this monitor can be calibrated on fresh ambient air, today we are going to use a cylinder of certified and filtered compressed air with an oxygen value of 20.9 percent. Plant air, instrument air or air from any type of in-house compressor should never be used as a calibration gas. Preferably, the air should be certified by a gas manufacturer.
Next, we will remove the sensor retaining nut from the bottom of the monitor and replace it with a calibration fixture.
Pic of ZeroAirCal Calibration Kit
The calibration fixture may be purchased directly from Alpha Omega Instruments, individually or as part of the Company’s ZeroAirCal Calibration Kit, which includes the calibration fixture, 5 feet of tubing, and a cylinder of certified compressed filtered air.
Now, please unscrew the sensor retaining nut and replace it with the calibration fixture. Set the sensor retaining nut off to the side for re-installation later.
The calibration fixture has both gas inlet and outlet ports to facilitate sensor aspiration.
Connect one end of the tubing to one of the gas ports. The port used to connect the tubing will serve as the inlet port and the other, the outlet port.
When power is applied, the monitor should read 20.9 percent oxygen on fresh ambient air. The monitor will take a moment to initialize. But as you can see, it is actually reading 20.4 percent and in all likelihood, should be calibrated.
We’ve already connected the tube from the calibration fixture’s inlet port to the cylinder of certified compressed air.
Open the cylinder valve to allow the certified compressed air to flow through the tube and aspirate the sensor. The cylinder’s pressure regulator delivers a preset flow rate of approximately one half liter per minute which is ideal for this requirement.
Pic of Cylinder with Flow Control
As the sensor responds to the certified compressed air sample, the instrument’s display shows a reading of 20.4 percent which verifies the need for calibration as the calibration gas contains 20.9 percent oxygen. CAUTION. if the monitor reads 20.9 percent on calibration gas, it may be an indication that the oxygen concentration in the room is at an abnormally low level and this should be immediately reported to the facility’s safety supervisor before any adjustment to the monitor is made. At this point, the monitor and calibration equipment are setup for calibration.
Deploying a permanently mounted oxygen deficiency monitor in areas where inert gases are stored or piped is highly recommended. Like most things in life, not all oxygen deficiency monitors are the same. Alpha Omega Instruments Series 1300 Oxygen Deficiency Monitor has an array of features and safeguards that makes it today’s premier monitor.
The Series 1300 is a digitally-controlled instrument with a measuring range of 0-30%. Oxygen values are displayed to the nearest tenth of a percent on a high contrast front panel liquid crystal display (LCD). The monitor is housed in a resilient polycarbonate, wall-mountable general purpose enclosure. Standard input power to the Series 1300 is 90-264 VAC, 47-63 Hz. and 18-36 VDC powered systems are available. The eloquence of the Series 1300 is its simple operation, as well as its ease of expandability. Included are four individually adjustable Form C alarm relays, each rated at 10 amps (250 VAC). The Series 1300 can be programmed to provide a maximum of nine individual alarm events. Two scalable analog outputs (4-20 mADC and 0-20 mADC) are standard, as is RS-232 serial communications. Each Series 1300 includes an internally mounted audible alarm rated at 85 decibels (nominal) as well as visual alarm indicators. The Series 1300 can control up to a maximum of 8 remote optional horn and strobe alarms.
ENHANCED ELECTROLYTE SYSTEM (EES)
The Series 1300 can be equipped with a local oxygen sensor and/or up-to two remote sensors. The sensors featured in the Series 1300 are extended life electrochemical oxygen sensors designed with a proprietary Enhanced Electrolyte System (EESTM) that extends the life expectancy of the sensor to years instead of approximately 12 months typical of most “fuel cell type” sensors. The oxygen sensors in the Series 1300 are designed with open diffusers eliminating the need to use sample pumps. Alpha Omega Instruments backs each Series 1300 oxygen sensor with a full three-year warranty. Users can expect sensor life well beyond 5 years, helping to ensure reliable and trouble-free performance.
Room Oxygen Monitor For facilities such as laboratories, industrial plants, medical facilities, food processing plants, et al. that have closed or restricted areas containing stored or piped inert gases such as nitrogen, helium, argon, carbon dioxide, etc., deployment of a room oxygen monitor is an excellent way of helping to ensure that breathing air oxygen levels are properly maintained. Most room oxygen monitors are designed to provide 24/7 protection by alerting personnel of a change in oxygen levels. However, not all room oxygen monitors (often referred to as oxygen deficiency monitors) are the same. There are appreciable differences between models of automobiles, laptop computers, and yes, room oxygen monitors. The focal point of Alpha Omega Instruments’ room oxygen monitors is their long-life electrochemical sensors with EEStm(enhanced electrolyte system). EES helps to ensure that the useful life of the sensor is in years not months like most "fuel cell" type oxygen sensors. Backing the Company’s claim of sensor longevity is Alpha Omega Instruments unprecedented extended sensor warranty. Many room oxygen monitors use sensors that need to be replaced every 12 months or so (planned obsolescence). But that's only half of the problem. It is quite common for room oxygen monitors with fuel cell [...]
The Importance of Oxygen Deficiency Monitors in the Work-Place If someone were to ask you what the major cause of gas related injuries in the work-place is, would your answer be carbon monoxide poisoning? What about exposure to ammonia, hydrogen chloride, carbon dioxide, hydrogen sulfide, or chlorine? Even though injuries are reported as a result of over exposure to these gases, oxygen deficiency continues to pose the largest overall health risk. Often referred to as the “silent killer”, oxygen depleted breathing air is the cause of numerous injuries and/or deaths on an annual basis. Breathing air oxygen can be depleted as a result of leakage of stored or piped inert gases such as nitrogen, helium, argon, carbon dioxide, sulfur hexafluoride, etc. These gases, as well as others, are often used in laboratories, fertility clinics, heat treating facilities, cryotherapy installations, shipyards, various manufacturing processes, MRI (magnetic resonance imaging) installations, research facilities, dry ice manufacturing facilities, and nuclear magnetic resonance spectroscopy (NMR) installations to mention a few. According to a recent paper released by OSHA (Occupational Safety and Health Administration) “oxygen can even be consumed by rusting metal, stored ripening fruits, drying paint, combustion, or bacterial activities.” so it’s not just [...]
Oxygen Sensor Types Today’s oxygen analyzers use one of a several types of oxygen sensors. As industrial process applications call for improved measurement accuracy and repeatability, users are also demanding analyzers that require a minimum of maintenance and calibration. To this end, users of oxygen analyzers are encouraged to evaluate the merits of a particular oxygen sensor type in context to the application for which it is intended. There is no one universal oxygen sensor type. The synoptic review of the various gas phase oxygen sensors provided below should be used in conjunction with information gathered from manufacturers of oxygen analyzers. This combination will help to ensure the selection of the right sensor type for the application under consideration. Ambient Temperature Electrochemical Oxygen Senors Paramagnetic Oxygen Sensors Polarographic Oxygen Sensors Zirconium Oxide Oxygen Sensors Ambient Temperature Electrochemical Oxygen Sensors The ambient temperature electrochemical sensor, often referred to as a galvanic sensor, is typically a small, partially sealed, cylindrical device (1-1/4” diameter by 0.75” height) that contains two dissimilar electrodes immersed in an aqueous electrolyte, commonly potassium hydroxide. As oxygen molecules diffuse through a semi-permeable membrane installed on one side of the sensor, the oxygen molecules are reduced at the cathode to form a positively charge hydroxyl ion. [...]