CO-801 dissolved oxygen controller.
The user may choose between two models: measuring the concentration of oxygen dissolved in water in %, range 0 ÷ 600 % or in mg/l, range: 0 ÷ 60 mg/l.
With use of an appropriate head, the device can make continuous measurements of concentration of oxygen dissolved in water in ponds, water treatment stations or industrial plants. High measurement accuracy and stability has been provided. The device has a large, graphic display, showing the oxygen concentration and temperature readout and the status of each relay simultaneously. The graphic display enables to choose among the displayed information. Apart from the basic data – oxygen concentration and temperature – one of the following additional parameters may be chosen to be displayed:
1. Information about the ralays’ status,
2. Information about the last calibration date.
Thanks to the modern electronic components the controller’s memory has become fully independent from the power supply.
The device is easy to operate and has an English menu.
It is equipped with a collective optical signalisation of the correct work and the progress of the controlling process.
The meter cooperates with a galvanic oxygen sensor.
CO-801 controller has an automatic temperature compensation system, which cooperates with the Pt-1000 temperature probe.
The device enables calibration of the oxygen sensor in 0% and 100% oxygen concentration with automatic detection of the calibration point value. It is possible to calibrate the sensor without the need of disconnecting the outputs.
The CO-801 controller is powered with standard 230 V voltage, which is galvanically isolated from the input clamps.
Outputs: relays (alarm or PID regulation), isolated digital output: RS-485, MODBUS (ASCII and RTU); isolated current outputs: 0 ÷ 20 or 4 ÷ 20 mA. Wide range of input voltage: 110/230/24V AC, 12-24 V. Low voltage signalisation.
The meter has also the real time clock with date.
24 months of warranty for the meter.

During measurements in tanks the controller may cooperate wit the COG-2 oxygen sensor hanged on a hook or hanger or with use of the GXZ-1t head. The length of the head may be agreed from 0.5 m to 4 m, diameter of the head 50 mm. The head is equipped with a special handle to be hanged on an arm or a hook. The measurement in a pipeline is made with use of flow through head GXP-1t. For the steel pipelines we offer a special mounting equipment for the oxygen sensor which is mounted on the thread placed on the pipe and made according to our drawings. In case of high pressure in the pipeline a use of the lateral circulation with free outflow of small volume of the liquid through the GXP-01 head should be used.
The choice of the suitable head depends on the measured liquid and the conditions.
The signal is amplified in the pre-amplifier, which is placed in the head or next to it.

Optionally there is a possibility of the radio transmission of data from the measuring head to the controller.

Measured values: Oxygen in water in % or mg/l, temperature °C
O2 concentration range: 0 ÷ 600 % or 0 ÷ 60 mg/l
Resolution: 0.1 % or 0.01 mg/l
Accuracy: ±0.2 % or ±0.02 mg/l ±1 digit*
Temperature measurement range: -50 ÷ 200 °C**
Temperature compensation: automatic
Temperature compensation range: 0 ÷ 40°C
Temperature measurement accuracy: ±0.2 °C***
Calibration: 1 or 2 points
Relays’ parameters: 2A/250VAC/30VDC, PID cotrolling
Measurement input: isolated
O 2 datalogger output: isolated, 0 ÷ 20 mA or 4 ÷ 20 mA
Temperature datalogger output: isolated 0 ÷ 20 mA or 4 ÷ 20 mA
RS485 output: isolated
Maximal RS485 connection length: 1000 m
Maximal cable length between preamplifier and controller: 200 m
Maximal distance between sensor and preamplifier: 10 m
Power supply: 240 V 50Hz, for a special order 170VAC÷250VAC, 24VDC/24 VAC
Isolation class: PN-83/T-06500
Radioelectric interference: N level
Dimensions (L x W x H): 215 x 215 x 95 mm
Weight of controller / preamplifier: 1350 g / 150 g
Ambient temperature: -25 ÷ 40 °C
Atmospheric humidity / pressure: max. 80% / 80 ÷ 110 kPa
Atmospheric aggressivity level: N/2/AG-U/C
* The accuracy of the meter only. With COG-1 or COG-2 oxygen sensor the accuracy at calibration temperature: ±1 %. By the difference ±5 °C accuracy: ± 3 %, by the difference ±10°C accuracy: ±5 %.
** Temperature measuring range limited to the temperature operating range of the O2 sensor.
*** The accuracy of the meter only, accuracy with the sensor built in the oxygen sensor in the range to 40°C ±0,6°C .