CR-801 mV controller is designed to make measurements of redox potential in pure water and sewage. It is one of the new generation controllers with wide range of features and applications. Designed to work in power stations, heat and power plants and water treatment stations. It is a stationary device in a housing resistant to humidity (IP-65).
High measurement accuracy and stability have been ensured. The device has a large, graphic display, showing the mV and temperature readout and the status of each relay simultaneously. It is possible to choose among the displayed information.
Apart from the basic data – mV and temperature – one of the following additional parameters may be chosen to be displayed: information about the relays’ status or information about the last calibration date.
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
Thanks to the modern electronic components the controller’s memory has become fully independent from the power supply.
CR-801 cooperates with Pt-1000 temperature probe.
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: 110/230/24 V AC, 12 – 24 V DC (optionally).
relays (alarm or PID regulation);
isolated digital: RS-485, MODBUS (ASCII and RTU);
isolated current outputs: 0 ÷ 20 or 4 ÷ 20 mA.
In case of using the relays and exceeding the entered lower or higher limits, the proper relay is switched (minimum and maximum alarm) or fill in or frequency coefficients are changed (for the PID controller)
The meter is equipped with real time clock with date.
It is possible to connect a remote panel (keyboard with display), which enables controlling the device from up to 1 km distance.
Possibility of the data radio transmission from the measuring head to the controller.
24 months of warranty, quick warranty and after warranty service.
Made in Poland.

The redox electrode, which cooperates with the device, is placed in a head. In case of mV measurements in tanks we recommend GXZ-1t head with suitable redox electrode chosen depending on the type of the measured liquid. The signal is amplified by preamplifier placed in the head.
The mV measurement in a pipeline is made with use of the GXP-1t flow-through head with aproppriate electrode chosen depending on the measurement conditions. For the steel pipelines we offer a special mounting equipment for the redox electrode which is mounted on the thread placed on the pipe and made according to our drawings.
If the pressure in the pipeline is higher than 6 bars use of the lateral circulation with free outflow of small volume of the liquid through the GXP-01 head should be used. In case of using flow-through heads the preamplifier is mounted next to the head.
There is a possibility of wireless data transmission from the head to the controller.

Measured value mV (redox), temperature
mV range ±2000 mV
Resolution 1 mV
Accuracy (±1 digit) ±1 mV ± 1 digit*
Input impedance: >1012Ω
Temperature measuring range: -50 ÷ 200 °C**
Temperature accuracy: ±0.2 °C*
The relays’ parameters: 2A/250VAC/30VDC, PID controlling
Measurement input: isolated
mV 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: 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 / 150g
Ambient temperature: -20 ÷ 40 °C
Atmospheric humidity / pressure: max. 80% / 80 ÷ 110 kPa
Atmospheric aggressivity level: N/2/AG-U/C
* The accuracy of the meter only.
** The temperature measurement range is limited to the temperature operating range of the redox electrode.