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Dissolved Oxygen

There are two main sources of DO in water: atmosphere and photosynthesis. Waves and tumbling water mix air into water where oxygen readily dissolves until saturation occurs. Oxygen is also produced by aquatic plants and algae as a by-product of photosynthesis.

The application of better measuring techniques ensures more accurate and cost effective monitoring of the Dissolved Oxygen Level.

Dissolved Oxygen Applications

  • Fisheries
  • Municipal Wastewater
  • Industrial Wastewater
  • Industrial Process - Low Level D.O.
  • Laboratories


Model 2200

An easy to use, dependable, microprocessor based analyzer & controller for Dissolved Oxygen in IP56 (NEMA 4X) enclosure. Digital LED display, 2 control relays with adjustable deadband, alarm relay for perforated membrane, 0-1 mA and 0-5 Vdc non-isolated outputs, 4-20 mA isolated output with range expand, cycling on/off control. Standard enclosure is surface mount. Panel and Pipe mounting optional.

sensor 91DO Dissolved Oxygen probe with 8m (25ft) cable, less cartridge

  • The sensor consist of a probe to which is fitted a cartridge that contains a precisely stretched permeable membrane, electrodes and electrolyte (p/n 91DO).
  • The inexpensive cartridge will provide continuous service for 6 to 12 months and is the easily replaced in minutes. The cartridge is supplied hermetically sealed for longer shelf life.
  •  Temperature range: 0-40°C (32 to 104°F)
  • Wetted materials: PVC and Teflon F.E.P.
  • Cable: Integral 8 m (26 ft.)
MEASURING RANGE: D.O. 0 - 20.00 ppm or 0 - 100% saturation
Temperature 0 to 40°C (32 to 104°F)
Wetted Materials: CPVC and Teflon F.E.P. membrane
Transmission Distance: 2000 ft (609 m)
ACCURACY:  % Saturation: ± 1%
ppm: ± 0.1
Temp: ± 0.2°C
STABILITY: 0.1% of span per 24 hrs., non-cumulative
RESOLUTION: % Saturation: 0.1
Ppm: 0.01
Temp: 0.1°C
REPEATABILITY: 0.1% of span or better
RESPONSE TIME:  20 seconds to 90% of value upon step change at 20°C
POWER REQUIREMENTS: 98-132 Vac, 50/60 Hz (less than 10 VA)
Optional: 196-264 Vac, 50/60 Hz
ANALOG OUTPUTS: Non-isolated 0-1 mA, 100 ohms maximum load
Non-isolated 0-5 Vdc, 1000 ohms minimum load
Isolated 4-20 mA, 800 ohms maximum load
The isolated output is isolated from the input, ground line power and all other outputs
Range Expand: The 4-20 mA analog output can be made to represent any segment of the measuring
scale. Minimum segment is 10% of full scale.
Output Hold: The analog outputs are automatically placed on hold during calibration or other setup operations.
Temperature Output: The 0-5 Vdc output can be programmed to follow either the process temperature or dissolved oxygen.
TEMPERATURE COMPENSATION: Automatic 0 to 100°C (32 to 212°F)
ALTITUDE COMPENSATION: Automatic 0 to 40°C (32 to 104°F) DIAGNOSTICS:
When system erros is indicated, call STATUS to obtain
condition code. On-board simulated input to aid in
troubleshooting to obtain condition code.
MEMBRANE ALARM:
A relay activates if membrane is perforated.
NET WEIGHT: 1.6 kg (3 1/2 lbs.)


Sensor cartridge 91D
Sensor Cartridge for 91DO probe.

:: SPX-P ::        The most popular panel meter

The PXP series display with integrated signal processor embodies many features and performance capabilities to suit a wide range of industrial applications. It is available in five different models to handle various analog inputs, including DC voltage/current, AC voltage/current, Temperature and Strain Gage inputs. The meter employs advanced technology for stable, drift free readout, while incorporating features that provide flexibility for both present and in the future with plug-in easy upgrade option cards.
The unit has two inputs, 0 to 20 (4 to 20) mA DC or 0 to 10 VDC, and a built-in 24 VDC supply to power remote transmitters. The PXP also incorporates a 16-point input scaling feature for compensation of non-linear processes. The signal totalizer (integrator) can be used to compute a time-input product. This can be used to provide a readout of totalized flow, calculate service intervals of motors and pumps, etc. The totalizer can also accumulate batch weighing operations.
The meter has been specifically designed for harsh industrial environments. With NEMA 4X/IP65 sealed bezel and extensive testing of noise effects to CE requirements, the meter provides a tough and reliable local readout.

Plug-in Card Options

These intelligent solutions can be enabled with optional plug-in cards, for set point alarms (2 or 4),analog output and communications (RS232, RS485, Modbus, Devinet, Profibus), enabled Ethernet via external module (ICM8). Each display can be fitted with up to three optional plug-in cards. However, only one card from each function type can be installed at a time. The function types include:
Four optional plug-in cards provide dual FORM-C relays (5 Amp), quad FORM-A relays (3 Amp) or either sinking or sourcing quad open collector logic outputs.
Plug-in cards also facilitate bus communications. These include RS232, RS485, USB, Modbus, Profibus, DeviceNet.
A linear DC output signal is available as a plug-in card. This card provides either 20mA or 10V signals, and the output can be scaled independent of the input range.
Additionally, the display has features that allow a remote computer to directly control the outputs of the unit. This is useful during commissioning phases and diagnostic use. With a communication card installed, set-up software allows configuration from a PC. The configuration data can be saved to a file for later recall.

Features

  • Four Set-Point Alarm Outputs (with Plug-In Card)
  • 20 mA or 10 VDC Input
  • Non-Volatile EEPROM Memory
  • Jumper Selectable Input Ranges
  • 7 Annunciators (MAX/MIN/TOT/SP1-SP4)
  • Programmable Function Keys/User Inputs
  • 41⁄2 Digit, 0.56" (14 mm) Sunlight Readable LED
  • Power: 85-250 VAC
  • NEMA 4X/IP 65.
  • Field Upgradeable Option Cards
  • 1/8 DIN (50 mm x 97 mm)
  • Label Kit: 189 Different Engineering Units, Labels Inserted Inside the UnitAC and DC Powered Versions

with

Luminescent Dissolved Oxygen sensor with direct 4-20mA output

The new optical dissolved oxygen sensor that outputs directly a 4-20mA or Modbus signal. Optical DO sensors offer advantages over electrochemical DO sensors in that they are inherently self-referencing, require no warm-up period, do not require flow and are less affected by fouling.
Maintenance is trivial. The sensor cap lasts for an industry leading 3 years or longer and is inexpensive to replace.
The body is corrosion resistant and designed to stand up to the harsh environment of wastewater.
No sensor on the market packs as much into one small package. Plug into your PLC, remote controller or computer and you’re ready to measure.

Technical Data
Measuring Range: 4ppb (0.5% air sat.) to 24 ppm (300%)
Accuracy at 25°C : 1± 0.05%-vol; 21± 0.2%; 50 ± 0.5%
Detection limit: 0.1 % - vol
90% Response Time: <30 sec at 25°C
Drift at Room Temp.: <0.2%-vol oxygen per week at 30°C
Power input: 7-30VDC. (0.6W)
Analog Output: 4-20mA scalable. Temperature compensated
Polarization voltage: 5-10 min for self heating
Transmission Rate: 4800 to 115,000 bd
Cross sensitivity: None (inc. CO2, H2S,    SO2)
Wetted Materials: 316SS, EPDM, silicone
Operation Temperature: -10    to 60°C
Pressure Range: -1    to 12 bar / 174 psi
Wetted materials: CPVC
Not resistant to: Chlorine, Chloroform, Toluene, Acetone
Digital Output: Modbus RTU over RS485
Enclosure type: IP65
Connector: VP 8.0 Variopin connector with PG 13.5
Mounting: PG 13.5-thread, IP68

Applications
• Wastewater treatment
• Sewage
• Boilers
• Fish farms
• Aquaculture

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