Q45D Dissolved Oxygen Monitor

ATIs Model Q45D Dissolved Oxygen monitor provides reliable oxygen measurement and reduced maintenance costs. The galvanic dissolved oxygen sensor uses a rugged 5 mil Teflon membrane to resist mechanical abrasions and tears. The membrane serves as a barrier to allow molecular oxygen to diffuse into the reaction cell where it is reduced, producing a small current which is proportional to oxygen concentration.

In applications where process constituents adhere to the membrane, frequent membrane cleaning is required. To keep the dissolved oxygen system nearly maintenance free, an optional Auto-Cleaner can be included to remove those materials that build up on the sensor membrane. The cleaning cycle is user selectable to maximize the cleaning effectiveness. When sensor maintenance is required, our cartridge-based sensor makes it fast and easy. Where other manufacturers make you throw away the cartridge, we’ve made our cartridge field repairable. We also include enough replacement parts to rebuild your cartridge ten times.

All dissolved oxygen sensors are affected by process coating. Any material that slows the diffusion of oxygen into the reaction cell will cause an error in the oxygen reading. If the system doesn’t have a means to clean itself, the sensor will require frequent manual cleanings, which means higher maintenance costs. Our self contained Auto-Clean system generates a series of high pressure air blasts to remove foulants from the face of the sensor. Each cleaning cycle lasts approximately 3 minutes, during which the monitor outputs are placed in a HOLD condition to prevent false readings or alarms. The user can vary the cleaning cycle frequency from as often as once every two hours, to as little as once a day. ATI was the first to introduce a dissolved oxygen system that cleans itself with air. Others have tried to copy our system, but none are more effective at removing biological growth and other contaminants than the ATI Auto-Clean system. So don’t be fooled by imitation air pump cleaners that are minimally effective at cleaning your sensor. Trust the original Air-Blast system. Trust the best.

 

ATI’s Model Q45D Dissolved Oxygen monitor is designed to provide reliable oxygen measurement and reduce maintenance costs.  The galvanic dissolved oxygen sensor uses a rugged 5 mil Teflon membrane to resist mechanical abrasions and tears.  The membrane serves as a barrier to allow molecular oxygen to diffuse into the reaction cell where it is reduced at the working electrode. This reaction produces a small current which is proportional to oxygen concentration.

 

In applications where process constituents adhere to the membrane, frequent membrane cleaning is required.  To keep the dissolved oxygen system nearly maintenance free, an optional Auto-Cleaner can be included to remove those materials that build up on the sensor membrane.  The cleaning cycle is user selectable to maximize the cleaning effectiveness. When sensor maintenance is required, our cartridge-based sensor makes it fast and easy.  Where other manufacturers make you throw away the cartridge, we’ve made our cartridge fieldrepairable.  We also include enough replacement parts to rebuild your cartridge ten times.  When you consider the average cost of a competitor’s cartridge at $125, ATI can save you thousands of dollars in maintenance costs. 

  

Monitor Features

 

 Loop-powered, AC, or Battery Versions:  This line of microprocessor based instrumentation allows for easy implementation of loop-powered, line-powered, or batterypowered capability within the same instrument.  This instrument can be rapidly converted between any of these versions with no requirement for software change.

•Loop-powered (16-35 VDC) Transmitter, 4-20 mA output• Line-powered (115/230 VAC) Analyzer, dual relays, dual 4-20 mA outputs• Battery-powered (9 VDC) Monitor/Data Logger, dual 0-2.5 VDC outputs
Large, Dual Line Display:  The large, high contrast, supertwist display provides excellent readability over a wide operating temperature range, even in low light conditions. The main display line consists of large, segmented characters with measurement units.  The secondary display line utilizes easily readable dot matrix characters for clear display of calibration and diagnostic messages.  Two of four measured parameters may be displayed simultaneously.
Interactive User Interface: Four-button programming provides intuitive navigation through the menu driven user interface
Dual Alarm/Analog Outputs: AC operated systems provide two relays that are configurable for either "control mode" or "alarm mode" of operation.  
Flexible Calibration: Air and sample calibration options include temperature, barometric pressure, and salinity compensation.  All calibration methods include stability monitors to check temperature and main parameter stability before accepting data.

  

Clean Running Means Better Performance

 

It’s a fact: A clean D.O. sensor performs better.

That’s because when there’s nothing between the sensing membrane and the water in the tank, you get uniform oxygen transfer for accurate measurement of dissolved oxygen content. And that translates into improved process performance, energy savings, and more effective water treatment.
Trouble is, not all D.O. monitors are easy to clean. Units that don’t clean themselves need to be removed for frequent maintenance. And those that do clean themselves with grindstones or brushes can be expensive and difficult to maintain. Still others use chlorine gas to kill contaminants on the sensor’s surface, but do nothing to remove contaminant buildup, leaving the source of the problem intact.
Enter ATI’s Auto-Clean D.O. Monitor, the first D.O. monitor to clean itself with air. Biological growth and other contaminants areliterally blasted from the Teflon membrane.  The result:  reduced maintenance, better performance, and more accurate D.O.monitoring.

 

Our Sensor Makes Sense.

 

 The Auto-Clean sensor uses the same rebuildable cartridge as our submersible-style sensor. The durable 5 mil Teflon membrane allows the sensor to perform in the most demanding applications. Modular design lets you easily remove the sensing element for service, reducing maintenance costs.
The sensor’s principle of operation is simple. Oxygen diffuses through a Teflon membrane and reduces on the surface of a working electrode, generating a small electrical current proportional to D.O. concentration. An RTD temperature element measures water temperature and corrects the sensor signal for its effect. The result is a D.O. measurement that’s accurate over an operating range of 0-50°C.

 

Model Q45D Dissolved Oxygen Monitor Specifications
Electronic Monitor

Display Range: 0 - 40.00 PPM  

Accuracy: 0.2% of span or better

Repeatability: 0.05% of span or better

Linearity: 0.1% of span or better

Temp. Drift: 0.01% of span/°C

Display: Large 4 digit main display, 0.75"
characters; 12 digit alpha-numeric
second line display

Power: 16-35 VDC for loop-powered unit
115/230 VAC, 50/60 Hz., 10 VA
max.; 9-Volt battery for battery
operated portable

Control Relays: Two SPDT relays, 6A @ 250 VAC,
5A @ 24 VDC, resistive

Relay Mode: Programmable for control, alarm,
or timer function

Analog Outputs: Isolated 4-20 mA, 550 ohm max.
load.  Two assignable 4-20 mA
outputs, 550 ohm max. (AC only)

Data Logger: Battery version only, stores 32,000
data points

Operating Conditions: -20-60°C., 0-95% R.H. non-condensing

Enclosure: NEMA 4X (IP-66) polycarbonate
wall, panel, or pipe mount 

Weight: 5 lbs. (2.3 Kg.) - standard system

15 lbs.  (6.9 Kg.) - Auto-Clean
Sensor

Sensor: Membrane-covered galvanic 
sensor 

Wetted Materials: Noryl and 316 Stainless Steel

Sensor Cable: 30 feet (9.0 M) standard, 
1,000 feet (300 M) maximum

Response Time: 90% in 60 seconds (2 mil membrane); 90% in 180 seconds (5 mil
membrane)

Temperature Limits: 0-50° C.