Dissolved oxygen transmitters and dissolved oxygen controllers.



  • Simultaneous DO and Temperature Measurement and Analysis
  • Reversible & Isolated 4 to 20mA Output With Adjustable Bandwidth
  • Membrane Keypad With Audio Feedback
  • Automatic Temperature Compensation
  • 4-Digit Password Security Protection
  • 1/4 DIN Watertight, IP65 Rated Enclosure

Industrial Dissolved Oxygen Transmitters Product Description

The 6308DT, Industrial Dissolved Oxygen Transmitter, is a rugged microprocessor based instrument assembled in a watertight, IP65, ¼ DIN panel mount case. The DO transmitters were designed to provide accurate and stable readings for use in laboratories and process control applications.

The industrial dissolved oxygen transmitter’s microprocessor allows the user to easily recalibrate the parameters for the DO probes. The DO transmitters require only a single calibration, regardless of which dissolved oxygen display you use. The Dissolved Oxygen transmitters provide a one-point calibration in air, then the calibration data is stored in memory and is ready for use on power up. The Industrial Dissolved Oxygen Transmitter’s microprocessor also performs a self-diagnostic routine every time you turn on the unit providing you with basic information about the stability of the DO transmitter.

Setup and calibration functions are done using the Industrial Dissolved Oxygen Transmitter’s friendly user guided menu. All Dissolved oxygen transmitters have a membrane keypad with tactile and audio feedback to improve durability and usability. The Industrial DO transmitter also provides password protection to ensure that the right people have access to change settings.

The Industrial DO transmitters simultaneously display DO, Temperature, Relay status and current output on one LCD graphic screen. The LCD also includes a backlight for badly lit environments. The dissolved oxygen transmitter uses a “polygraphic clark” membrane for the DO and a precise thermistor for temperature, providing you with accurate readings for all your measurements.

The Industrial Dissolved Oxygen Transmitter is equipped with 5 programmable relays (2 active Low and 2 active High relays for DO and one programmable high or low relay for temperature); all relays are hysteresis driven and configurable to CENTER or EDGE mode. The Industrial DO Transmitters also have an isolated and reversible 4-20mA analog output, which can be used as a proportional output. The dissolved oxygen transmitters provide programmable offsets and spans for the DO transmitter’s display.

The Industrial Dissolved Oxygen Transmitter comes with a RS485 interface, which can easily let the user log all data with an IBM© PC/AT compatible computer. Multiple DO transmitters can be connected together to gather data quickly and efficiently. All dissolved oxygen transmitter connections are done via standard terminal blocks for tinned leads.

Dissolved Oxygen Data Recording and Process Control
Global Water’s PC320 Dissolved Oxygen Controller to use the dissolved oxygen transmitter’s output to control addtional pumps or alarms.  In addition the GL500 dissolved oxygen recorder adds recording capabilities to the dissolved oxygen transmitter.  The GL500 dissolved oxygen recorder connects to the dissolved oxygen transmitter’s 4-20mA output to record data.

Industrial Dissolved Oxygen Transmitters Specifications


Salinity Compensation: Manual 0.0 to 40.0 ppt
Pressure Compensation: Manual 640 to 1100 mBar
Temperature Compensation: Auto 14.0 to 122.0 °F (-10.0 to 50.0 °C)

Temperature Sensor: Thermistor, 10.00 k ohm at 25 °C

4-20 mA Analog Output:
Current Output Range: 4 to 20 mA (isolated), programmable span
Current Output Scale: User programmable, linear or log
Maximum Load: 500 ohm
Accuracy: ± 0.02 mA
Isolation Voltage: 500 V DC

Control Type: 5 ON/OFF controls
Relay Output: 5 A at 115 V AC or 2.5 A at 220 VAC, resistive load only

Power Supply: 115 V AC or 230 V AC at 50/60 HZ
Security: 4-digit password
Audio Feedback: All Touch Keys
Communication: RS-485
Fuse: 0.315 A / 250 V AC at 50/60 Hz
Display: 128 x 64 graphical LCD with backlight
Ambient Temp. Range: 32 to 122 °F (0 to 50 °C)
Case: IP65, 1/4 DIN case, 5.83 inch (148 mm) depth
Weight: 2lbs (950g)

Industrial Dissolved Oxygen Transmitters Options

6308DT Industrial Dissolved Oxygen Transmitter (PN# DO0200)
Industrial DO Transmitter sensor not included.

LD-900-6-DO Industrial DO Transmitter Sensor (SS Body) (PN# DO0210)
SS body, 3/4 NPT Mount on Front, Tinned Leads, Max Pressure 80 PSI, 10 ft Water Proof Cable. & NOTE: This sensor does not include a DO membrane.


ID-900-5-DO Industrial DO Transmitter Sensor (Epoxy Body) (PN# DO0220)
Epoxy body, 3/4 NPT Mount on Front and Back, Max Pressure 80 PSI, 10 ft Cable.  NOTE: This sensor does not include a DO membrane.


WQ SLD-900-3-DO Industrial DO Transmitter Sensor Membrane Kit (PN# DO0230)
6-Caps, DO KCL Powder, Sandpaper


DO600 Dissolved Oxygen Meter
Includes DO electrode, protective sensor cap, spare membrane cap, electrolyte, four 1.5V SR44W batteries, and a 48 inch (1.2m) neckstrap.

DO610 Dissolved Oxygen Probe Kit
Includes EC500 Conductivity/TDS/Salinity/pH/Temperature meter, DO600 Dissolved Oxygen probe, and accessories.

DO200ACC Field Dissolved Oxygen Meter Kit
Includes field DO meter, cable with attached DO/temperature probe, and hard sided case.

Oxi 3205 Set Handheld Dissolved Oxygen Meter Set
Includes dissolved oxygen meter, DurOx® 325-3 dissolved oxygen probe (9.8ft cable), case & accessories.

Oxi 1970i Portable Dissolved Oxygen Meter w/universal power supply

WQ401 Dissolved Oxygen Sensor

WQ-FDO Optical Dissolved Oxygen Transmitter
Includes 25 ft of cable.

GL500 Dissolved Oxygen Recorder
Dissolved oxygen recorder for sensor datalogging.  Includes Global Logger Software.  With weather proof enclosure and 12V battery.

PC320 Optical Dissolved Oxygen Controller

WQ Water Quality Sensors