Digital temperature sensor ZET 7020

  • Type of sensors connected: thermocouple
  • RS-485 data interface
  • Ready for operation

From 67 USD

* Minimum order value: from 7 700 USD

Specifications

of digital temperature sensors ZET 7020

Metrological perfomance
Measured value temperature
Minimum value of the measured temperature -270 °C (depending on the thermocouple used)
Maximum value of the measured temperature 2500 °C (depending on the thermocouple used)
Sensitivity threshold (minimum difference value between two consequtively measured values) 0,001 °C
Absolute measuring tolerance (with a type-T thermocouple, Tolerance Class 1) 0,5 %
Relative measuring tolerance (from the measured value) 0,05 %
Additional measuring tolerance (depending on temperature changes) 0,05 %/10°C
Technical specifications
Type of connected thermocouples R, S, B, J, T, E, K, N, A1, A2, A3, L, M
Electrical voltage measurement range from the connected primary transducers -73 – +73 mV
Cold junction compensator yes (integrated)
Refresh rate 1; 4 Hz
Data interface RS-485
Data rate 4800, 9600, 14400, 19200, 38400, 57600, 115200 bit/s
Parity control 0 – no control; 1 – control (oddity, ODD)
Data communication protocol Modbus RTU
Linear inputs overvoltage protection ( 1 A) 19 V
Interface inputs impulse protection  (350 W, 8/20 ms) 28 V
Operational parameters
Dimensions 71×39×17 mm
Weight 30 g
Device power  9 – 24 V
Power consumption at voltage 12 V up to 40 mA
Reverse polarity protection yes
Operation temperature range* from -40 up to +100 °C
Electromagnetic compatibility EMC
MEK 61000-4-2 (IEC 61000-4-2), ESD contact 4 kV, air 8 kV
MEK 61000-4-4 (IEC 61000-4-4), EFT power 0,5 kV, signal 0,25 kV
MEK 61000-4-5 (IEC 61000-4-5), Surge 500 V

* Operation measurement temperature range is detrmined by characteristics of the connected thermocouple

Parity control in the  EVEN mode is not supported.  Modbus ASCII is not supported.

  • Product versions

    Standard: laboratory version – green plastic casing.
    OEM: compound coating.
    Industrial*: standard module placed into leak-proof casing (with transparent cover).
    *Option

Functions

of digital temperature sensors ZET 7020

Digital temperature sensor ZET 7020 is designed for measuring temperature of liquid, solid, gaseous and granular mediums, which are safe for the material of thermocouple casing. Application spheres: heat power energy, chemical and metallurgical industry.

The digital sensor is used for fast and easy temperature measurement and does not require calibration of measuring and data processing channels.

Operation principles

of digital temperature sensors ZET 7020

Measuring module ZET 7020 and a thermocouple together form a digital temperature sensor.

ZET 7020 module converts the signal received from thermocouple into temperature readings.

Particular type of thermocouple should be chosen in accordance with features of particular task (measuring range, tolerance, operational environment).

The sensors are mounted on the measured object and interface modules providing data transfer are placed inside of electrical cabinets.

ZETLAB electrical cabinet has compact dimensions if compared with available analogues. Among  ZETSENSOR modules advantages one can mention easy mounting and de-installation as well as power indication and signal transfer, which makes it easy to perform on-site system diagnostics.

Connection schemes

of digital temperature sensors ZET 7020

Connection of digital temperature sensors ZET 7020 to a PC can be implemented via USB (converter USB ↔ RS-485 ZET 7070), Ethernet or Wi-Fi (converter Ethernet/Wi-Fi ↔ RS-485 ZET 7076).

The delivery scope of interface converters includes ZETLAB Software which considerably enhances the capabilities of digital temperature sensors implementation. Measuring networks can also be connected to any system using the Modbus protocol via interface RS-485.

Measuring network construction

based on digital temperature sensor ZET 7020

Digital temperature sensors  ZET 7020 perfectly suit for designing of temperature measurement distributed systems. Since signal processing is performed at the place of measurement this considerably increases precision of measurement results. Besides, one can use inexpensive cables for data transfer. Up to 4 digital sensors can be connected to a single module ZET 7070 when using integrated power supply module of ZET 7070 and up to 60 if an external power supply unit is used.

Wiring plan 7020

Attention

When placing an order for a thermocouple, please, make sure that its wire length suits you, since increasing the cable length without approval from the manufacturer may affect the metrological specifications of the thermocouple.

Software interface

of digital temperature sensors ZET 7020

  • Modbus ZETLAB
    ZETSENSOR operation via  interface converters ZETSENSOR with standard ZETLAB software
  • Modbus RTU
    Perfomance of ZETSENSOR RS-485 via third-party interface converters and software
  • Modbus RTU (LINUX)
    Perfomance of ZETSENSOR RS-485 via third-party interface converters and software in OS Linux
  • OPC DA
    Perfomance of ZETSENSOR via third-party interface converters in real-time mode

ZETLAB measurement results

of digital temperature sensors ZET 7020

Joint use of digital sensors and control modules enables creation of control sytems, automated equipment complexes and various control devices.

The recorder. Temperature measurement results

The recorder. Temperature measurement results

Graph of temperature in the office. ZET 7020 sensor reading

Graph of temperature in the office.

The temperature value measured by the digital temperature sensors ZET 7020 at 12 points of the room

Control

of digital temperature sensors ZET 7020

Digital temperature sensor ZET 7020 starts temperature measurement immediately after power connection and does not require any special technical maintenance. All the necessary settings are set in the course of manufacturing process and are stored in the measuring module memory. The obtained temperature readings data are transmitted via RS-485 interface and Modbus protocol.

When changing the primary transducer it is necessary to update module settings. In order to do this one has to connect module to the PC, start the software “ZETLAB – device manager” and set the parameters in the tab “Thermocouple”.

Configuring the Digital Temperature Sensor

Configuration management

Parameter Possibility of changes Acceptable values Description
Thermocouples type Yes Voltage
Resistor
CJC
Type (R, S, B, J, T, E, K, N, A1, A2, A3, L, M)
Value «Voltage» is to be set for voltage measurement. Value «Resistor» — for impedance measurements. «CJC» — for measuring of cold junction temperature. The remaining values are set depending on the type of primary transducer used.
Frequency Hz Yes 1; 4 Sensor data frequency
Minimum measured temperature value Yes The parameter determines minimum measuring value of the module. The value is specified in accordance with technical specifications of the primary transducers used together with the module.
Maximum measured temperature value Yes The parameter determines maximum measuring value of the module. The value is specified in accordance with technical specifications of the primary transducers used together with the module.
Measured value Yes °C
kOhm
mV
The value is determined based on the selected type of thermocouples (for “Voltage” – mV, “Resistor” – Ohm, for remaining options –  °C)
Shift Yes on
off
The parameter always should be set as «on»
Sensor serial number Yes The parameter is set only when it is necessary to identify the serial number of the sensor connected to the module ZET7020

TECHNICAL SUPPORT

Design

and installation of measuring networks

Basic configuration

of digital temperature sensors ZET 7020

Standard equipment

Basic configuration of the digital sensor includes:

  • Digital temperature sensor ZET 7020;
  • DIN rail mounting panel for plastic modules 71×39;
  • set of operational documentation.

From 67 USD

* Minimum order value: from 7 700 USD

Order form - If you want to place an order or to make a request regarding technical specifications of particular product, fill out the form below:

Necessary measuring equipment

supplied upon special order

Interface converter ZET 7076 Ethernet Wi-Fi RS-485
ZET 7076 interface converter
Ethernet connection