background image

FEATURES 

 

High accuracy linear output 

 

Configurable outputs:                                              
4-20mA and 0-10

V

DC

 or RS232 comms

interface  

 

Selectable output measurement ranges:                      
Standard ranges of 0-25% O

and                   

0-100% O

2

 or fully adjustable via RS232 when

configured in 0-100% O

2

 mode 

 

Externally triggered automatic or manual
calibration  

 

Can be calibrated in normal air (20.7% O

2

) or in

any other known O

concentration

 

 

Cycling 3.3

V

DC

 logic output allows direct

monitoring of the O

sensor pump cycle for  

diagnostic purposes

 

 

Selectable output filtering allows adaptive, fast
and dynamic or slow and stable output         

SPECIFICATIONS 

Maximum ratings 

Supply voltage                                               24V

DC

 ± 10%

Current consumption 

 

 

         500mA max  
@ 24V

DC

4-20mA

Load 

 

 

 

         100 to 600Ω Tem-

perature limits (electronics enclosure)            

Storage 

 

           

 

-10 to 85

C

Operating   

 

 

 

-10 to 85

Temperature limits  
(permissible gas temperature at sensor tip)            

Operating  (Standard Temp)

-100 to 250

(High Temp) 

-100 to 400

C

Gas flow rate  

 

 

0 to 10 m/s

Weight 

 

 

 

<450g

Incidental permissible acceleration

30g Repetit-

ive permissible acceleration

5g 

Sealing Rating 

 

 

IP65 

APPLICATIONS 

 

Combustion control including oil, gas and
biomass boiler applications 

 

Composting  

 

Laboratory & building air quality monitoring 
including confined space personnel safety 

 

Industrial process control i.e. gas mixing for 
welding and steel making 

 

Oxygen generation systems 

 

Medical  

 

Scientific including respiratory studies of a 
community or an organism, plants and
animals 

 

Food and beverage packaging 

 

Applications where low oxygen is key  
including fermentation, rust and corrosion
prevention, inerting and purging 

7823

 Oxygen Analyser 

ECO

line

 

7823 Oxygen Analyser

E instruments 

Page 1 of 12

Содержание 7823

Страница 1: ...ctronics enclosure Storage 10 to 85 C Operating 10 to 85 C Temperature limits permissible gas temperature at sensor tip Operating Standard Temp 100 to 250 C High Temp 100 to 400 C Gas flow rate 0 to 10 m s Weight 450g Incidental permissible acceleration 30g Repetit ive permissible acceleration 5g Sealing Rating IP65 APPLICATIONS Combustion control including oil gas and biomass boiler applications ...

Страница 2: ...em GND A digital 3 3VDC logic output cycles at the same frequency as the electrochemical pumping action of the oxygen sensing cell during normal operation thus providing a real time sensor health check if the output ceases to cycle the sensor has entered a start up or error state This provides fault proof operation The digital output is also used during the calibration process to indicate the inte...

Страница 3: ...action time adaptive output filtering in normal air 1 s Notes 1 Prolonged operation below 0 1 O2 can damage the sensing element 2 Assuming barometric pressure remains constant 3 As the O2 sensor measures the partial pressure of oxygen PPO2 within the measurement gas deviations in the Barometric Pressure BP from that present during calibration will cause readout errors proportional to the change Fo...

Страница 4: ...LINE DRAWING AND MOUNTING INFORMATION Mounting holes accessible on removal of housing lid PCB LAYOUT REMOVE HOUSING LID TO VIEW 7823 Oxygen Analyser ECOline 7823 Oxygen Analyser E instruments Page 4 of 12 ...

Страница 5: ...t flow in the supply GND when monitoring the 0 10VDC output pin 6 it is recommended that a separate GND wire for the measurement system is taken from PIN 2 This removes errors due to voltage drops in the power supply connections SYSYEM BLOCK DIAGRAM PIN Description 1 24VDC 10 2 GND 3 Calibrate 4 Cycle 5 4 20mA RS232 Tx 6 0 10VDC RS232 Rx CENTRE Housing Probe Earth 7823 Oxygen Analyser ECOline 7823...

Страница 6: ...f the PC and Rx goes to Tx of the PC The 7823 communicates via standard COM port settings that are default on most PCs and many other RS232 compatible devices If however communication problems are occurring use the settings below to configure the PC or device COM Port ECOline 7823 Oxygen Analyser E instruments Page 6 of 12 ...

Страница 7: ... as both an averaged and raw value The averaged values give a stable output with the amount of averaging user variable whilst the raw un averaged values allow the user to detect sudden oxygen changes The averaged value is the measurement output on both the 4 20mA and 0 10VDC outputs The sensor Td value is the measure of the partial pressure of oxygen in the measurement gas The O2 concentration is ...

Страница 8: ...ave The new averaging value is now stored in memory This value is retained on power loss Adjusting the Minimum and Maximum Ranges of the Analogue Outputs 4 20mA and 0 10VDC The 7823 is factory default to output a range of 0 25 O2 via its two analogue outputs This range can be expanded to 0 100 O2 as described on Page 7 When the unit is reconfigured to output 0 100 O2 the user also has the option t...

Страница 9: ...ins if powering from cold Apply GND to the CALIBRATE input PIN 3 for a minimum 5s or until the CYCLE output and green LED blink at a steady 1Hz Remove GND from PIN 3 Manual Calibration is now initialised Adjust the MANUAL CAL POT until the output equals the correct value of the calibration gas concentration Re apply GND to PIN 3 for a minimum 5s During the 5s the CYCLE output LED will blink rapidl...

Страница 10: ...er droplets are likely the sensor should be protected from water falling directly onto the very hot sensor cap as this can cause massive temperature shocks to the cell and heater Popular methods include a hood over the sensor cap or for the sensor to be mounted in a larger diameter cylinder At a very minimum the sensor cap should be angled downwards in the application as this will deflect any fall...

Страница 11: ...e to these metal vapours must be avoided 3 Halogen and Sulphur Compounds Small amounts 100ppm of Halogens and or Sulphur compounds have no effect on the performance of the oxygen sensor Higher amounts of these gases will in time cause readout problems or especially in condensing atmospheres corrosion of sensor parts These gases often outgas from plastic housings and tubes when hot Investigated gas...

Страница 12: ...product could result in personal injury Failure to comply with these instructions could result in death or serious injury CAUTION Do not exceed maximum ratings and ensure sensor is operated in accordance with all requirements of AN0043 Failure to comply with these instructions may result in product damage It is the customer s responsibility to ensure that this product is suitable for use in their ...

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