CX-804 multifunction controller is one of the new generation controllers with wide range of features and applications. It enables simultaneous measurement in 1 to 4 measurement points. The readouts are displayed simultaneously on graphic display. The information about the relays' status is also given.
High measurement accuracy and stability have been ensured.
Thanks to the modern electronic components the controller’s memory has become fully independent from the power supply.
Depending on the needs the controller may be prepared and programmed for measurements of the chosen functions.
It is possible to choose up to 4 measurement functions and make simultaneous measurements with use of suitable types of electrodes and sensors.
Depending on the needs, the device is able to measure pH, redox, conductivity, oxygen dissolved in water, relative air humidity and temperature. The devcice may be also used for measurement of one function, but in 4 points (e.g. pH).
The controller is a stationary device in a housing resistant to humidity (IP-65).
Easy and intuitive in use.
CX-804 cooperates with several kinds of immersible or flow heads. The choice of suitable head, sensors and electrodes has to be agreed individually with the user, because it depends on the chosen type of measurement function, working conditions and parameters of the measured liquid.
The signal from the electrodes or sensors is amplified in pre-amplifier placed in the head or next to it in case of flow heads.
After converting the signal from electrodes and sensors, the device calculates it to the measured function units and shows the readout on the display. At the same time, the measurement signal is compared with set alarm threshold (upper or lower) and in case of exceeding it, the relay in appropriate channel is switched. The device enables entering the threshold value of the measured function separately for each channel and sending the information about measurements in all channels to the computer.
Each channel is additionally equipped with isolated current loop outputs at 0 ÷ 20 or 4 ÷ 20 mA.
Isolated digital outputs: RS-485, MODBUS (ASCII and RTU).
The device is equipped with two relays controlling valves or other devices for each channel.
Contrary to the controllers of 801 series, CX-804 does not have the PID controlling option.
It is possible to calibrate the meter without the need of disconnecting the outputs.
The controller is powered with standard 230 V voltage, which is galvanically isolated from the input clamps. It is possible to use different power supply voltage: 110/230/24V AC, 12 – 24 V DC (optionally).
The device is easy to operate, has an English menu. It is equipped with a collective optical signalisation of the correct work and the progress of the controlling process.
The device is equipped with real time clock with date and low power supply level signalisation system.
It is possible to connect a remote panel (keyboard with display), which enables controlling the device from up to 1 km distance.
Instead of cable connection there is a possibility of the data radio transmission from the measuring head to the controller.
24 months of warranty, quick warranty and after-warranty service.
CE Certificate.

pH measurement
Measured value pH, temperature
pH range 0 ÷ 14 pH
Resolution 0.01 pH
Accuracy * 0.02 pH ±1 digit
Input impedance: >1012Ω
Temperature measuring range: ** -50 ÷ 200 °C
Temperature compensation: automatic
Temperature compensation range: -5 ÷ 130 °C
Sensor calibration: 1, 2 or 3 points
value of the solutions set in a given range

Measured value mV, temperature
mV range -2000 ÷ 2000 mV
Resolution 1 mV
Accuracy * ±1 mV ±1 digit
Input impedance: >1012Ω
Temperature measuring range:**: -50 ÷ 200 °C

Measured value conductivity, temperature
Range: version for measurements in clean water: 0 ÷ 9999 μS/cm
version for measurements in sewage, waste water, etc. 0 ÷ 999.9 mS/cm
Resolution depending on the range 0.1 μS/cm to 0.1 mS/cm
Accuracy * 0.5% ±1 digit
Temperature compensation: automatic
Temperature compensation range: -5 ÷ 70 °C
Temperature measuring range: **: -50 ÷ 200 °C
K constant range: 0.005 ÷ 20.000 cm -1
α coefficient range: 0.00 ÷ 10.00 %/°C
Sensor calibration: 1 point by entering the constant K of the cell or with use of the standard solution

Oxygen dissolved in water
Measured value O 2, temperature
Oxygen O 2 % 0 ÷ 600 %
Oxygen O 2 mg/l 0 ÷ 60 mg/l
Resolution 0.1 % or 0.01 mg/l
Accuracy *** ±0.2 %, ±0.02 ±1 digit
Temperature range: **: -50 ÷ 200 °C*
Temperature compensation: automatic
Temperature compensation range: 0 ÷ 40 °C (for mg/l measurement)
Sensor calibration: 1 or 2 point

Relative air humidity (RH)
Measured value RH, temperature
Range % 0 ÷ 100 %
Temperature range: -40 ÷ 70 °C
Temperature compensation range: -20 ÷ 70 °C
Resolution: 0.1 %
Accuracy ±2 % RH range 10 ÷ 90 RH, beyond this range ±4 %, temperature ±1 °C

Temperature - as a separate parameter
Measured value temperature
Range -70 ÷ 300 °C
Resolution: 0.1 °C
Accuracy **** ±0.2 °C

Other data
Temperature accuracy:* ±0.2 °C
The relays’ parameters: 2A/250VAC/30VDC
Measurement input: isolated
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.
** Temperature measuring range limited to the temperature operating range of the head or electrode.
*** 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 %.
**** The accuracy of the meter only. The total error includes the meters and probe’s accuracy. In the range 0 ÷ 100 °C the acceptable error of the probe with Pt-1000B resistor:±0.8 °C, with Pt-1000A resistor: ±0.35 °C.