E2 - Calibration and control unit for water supply

Process Controller E2 is a control unit-datalogger designed for numerical and graphical display and data recording from connected sensors of dissolved oxygen, pH, REDOX potential, turbidity, conductivity, ISE, temperature and for calibration of these sensors and for control of connected technology using internal relays and current outputs 4-20 mA.

The two-channel design allows the simultaneous connection of sensors of two identical or different quantities and thus reduces the purchase price per measuring point.


 E2 telemetrická a kalibrační jednotka


  • Display and recording of data from connected sensors - datalogger function
  • One or two point calibration of connected sensors, password access


  • Touch color display, controlled brightness
  • Intuitive MENU, language versions
  • 4x PID control of controlled technology
  • 2x active separate output 4-20 mA
  • 4x user-adjustable relays
  • Simulation of outputs in manual mode
  • Interface: 1x USB, 2x RS485 (Modbus)
  • Supply voltage 24 V DC or 230 V AC
  • Backup power from internal battery.
  • Extensive self-diagnostics (monitoring of voltages and currents, measuring humidity inside the device, ...)


  • Integrated data logger with real time for recording measured data
  • Recording events in the station log
  • Internal GSM / GPRS data module (E2-G)
  • Sending warning SMS - exceeding the limits, self-diagnostics (E2-G)
  • Visualization of measured data in the form of graphs and tables on the server (E2-G)
  • Data access and remote parameterization via web browser (E2-G)
  • High protection IP67, solid metal casting
  • Optional accessories for outdoor installation (KR2 mounting bracket, brackets)


Basic description

The measured values are continuously stored in the internal memory of the controller and can be transmitted to the server via the internal GPRS module (version E2-G).

The large touch screen and fingerboard keyboard contribute to easy and intuitive operation of the unit. A clear control MENU in several language versions also helps.

The robust design of the metal housing with high IP67 protection and a number of self-diagnostic procedures contribute to the high operational reliability of this universal unit.

A stainless steel bracket is also available for quick installation of the controller, which also forms a protective cover for the unit. It is attached to a railing or post using brackets.

Basic functions and features

Connection of sensors and display of measured values 

  • Connection of sensors via RS485 interface (Modbus RTU and FINET)
  • Two measuring channels reduce the purchase price per measuring point
  • Along with the main measured quantity, the temperature is also displayed
  • Storing measured values in the device memory - datalogger function
  • Possibility of simultaneous display of values of both channels in one screen or cyclic alternation of measured values and graphs
  • Display of preset limits in the graphical display
  • Automatic display brightness adjustment according to ambient light
  • Control of the unit via touch screen or keyboard
  • Clear control MENU in several language versions

PID control

  • Two adjustable controllers with mode selection - P - PI - PID
  • Control of binary (relay) or analog (4-20 mA) output
  • Recording the status of the controller in a binary channel

Binary outputs - relays:

  • Two classic relays, switching contact 250 V / 4 A, open at rest
  • Two solid state relays, output 0/12 V-2 A, at rest 0 V
  • Possibility to control other relays in expanding external modules
  • Limit, time and logic control of own and external relays (AND, NAND, OR, XOR, NOR functions, exit and arrival delay, blower alternation and fault trip function)

Analog outputs 4-20 mA

  • Two active 4-20mA current outputs separated from nap. Tension
  • Output settings 0/4 - 20 mA, resolution <0.001 mA
  • Possibility to control other current outputs in external modules MAV421 and MAV422 via RS485 bus


  • USB for parameterization and reading of archived data (USB mini)
  • RS485 for connecting sensors and controlling external modules
  • RS485 for data transfer to the superior system (Modbus RTU)

Data recording to internal memory

  • Datalogger - data memory for> 500,000 values ​​(more than an annual data record)
  • Adjustable archiving interval from 10 sec to 24 hours
  • Possibility to call up archived data on the display of the unit (graphs)
  • Recording the status of binary channels (motor runs and faults, ...)
  • Recording of status events in the device operation log (power failures, sensor failures, received and sent SMS, ...)

Warning, info and control SMS system (E2-G only):

  • Telephone directory for 24 recipients, grouping into 3 groups
  • 24 adjustable warning SMS messages activated by reaching the set limit of the measured quantity, power failure, ...)
  • Informative SMS compiled on the basis of command line or query SMS (current values, maximums, minimums, ...)
  • Command commands and SMS for control and simulation of outputs
  • (binary and analog), forced sending of data to the server, ...)

GPRS (only telemetry station - GPRS data logger E2-G)

  • Automatic sending of data to the server at regular intervals
  • Switch to more frequent transmissions after evaluation of the alarm condition
  • Sending data directly to email or FTP server (daily reports)
  • E2 / G parameterization and FW upgrade via server
  • Backup of current parameter files on the server

Optional accessories:

The KR2-V stainless steel mounting bracket also forms a cover for the flow meter from rain and sunlight. The bracket is attached to the vertical support structure using one 1.5”, 2” or 2.5” bracket.



The KR2-H mounting bracket is adapted for a horizontal supporting structure.


Recommended sensor types


Optický oxymetrMeasurement of dissolved oxygen by optical method:

sensor: ESKO12 (modbus RTU on RS485)

measuring range: 0 to 20,00 mg/l1




oxymetr - rozpuštěný kyslík

Dissolved oxygen measurement by Clark sensor:

sensor: ESK12 (FINET on RS485)

measuring range: 0 to 20,00 mg/l1




pH measurement:

sensor: PH485 (FINET/Modbus RTU on RS485)

measuring range: 0 tu 14,00 pH




Measurement of potential of ion selective electrodes:

sensor: ISE485 (Modbus RTU or FINET on RS485)

measuring range: -2000 to +2000 mV




Redox potential measurement:

sensor: ORP485 (Modbus RTU or FINET on RS485)

measuring range: -2000 to +2000 mV




ESP11-100 pH-metrRedox potential measurement:


sensor: ESR11 (FINET on RS485)

measuring range: -1200 to +1200 mV




zákaloměrTurbidity measurement:

sensor: S461/T (Modbus RTU on RS485)

measuring range: from 0 to 4,00 NTU to 0 to 1000 NTU




konduktometr - měření vodivostiConductivity measurement:


sensor: ESV11 (FINET on RS485)

measuring range: 25 to 2000 uS/cm




1 to 2 main quantities (pH, dissolved oxygen, redox, conductivity, ISE) + temperature

Basic technical parameters

Number of measuring channels1 to 2 main quantities (pH, dissolved oxygen, redox, conductivity, ISE) + temperature
Data memory capacitymore than an annual record, cyclical scrolling
DisplayRGB 3.5 ”, resolution 320x240 px., Controlled backlight
Keyboard8 fingerboards, mechanical press response
Analog inputs4x 4(0)-20mA
Binary inputs4 inputs, active state-switching with GND (OC, contact)
Binární výstupy2x relé 250 V, 4A; 2x polov. relé 0/12 VDC, 2A
Analog outputs2x active galvanically isolated output 4-20 mA
Optional power system12-24 VDC, 180-250 VAC / 50 Hz or only battery 12V / 7 - 45 Ah with / without solar panel
Battery lifeup to 6 months depending on the frequency of transmissions (E2-G)
Controlled power supply of connected sensors2 sections, adjustable voltage 6 to 18 V DC
Self-diagnosticscurrent from the source and current taken by the sensors, supply voltage, temperature and rel. humidity inside the flow meter, ...
Waiting for the sensors0-240 s
Real time clockcontinuous synchronization via GPRS
GSM modemQuad-band 850/900/1800/1900MHz (Q2G)
Working temperature range-20 to +60 °C
Dimensions (h x w x d)130 x 160 x 85 mm
Weight1480 g including backup Li-Ion battery
CoverIP67, robust metal case
Price list