Digital temperature sensor ZET 7021

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

From 67 USD

* Minimum order value: from 7 700 USD

Specifications

of digital temperature sensors ZET 7021

Metrological perfomance
Measured value temperature
Sensitivity threshold (minimum difference value between two consequtively measured values) 0,001 °С
Absolute measuring tolerance (with a thermal resistance of AA class) ±0,1 °С
Relative measuring tolerance (from the measured value) 0,05 %
Additional measuring tolerance (depending on temperature changes) 0,05 %/ 10°С
Technical specifications
Nominal static characteristics of connected primary transducers 100П(0,00391), 50П(0,00391), Pt100(0,00385), Pt50(0,00385), 100М(0,00428), 50M(0,00428), Cu100(0,00426), Cu50(0,00426), 100H(0,00617), 50H(0,00617)
Signal measurement range of resistance from primary transducer from 0,2 up to 450 Ohm
Refresh rate 1 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
Operational parameters
Dimensions 71×39×17 mm
Weight 35 g
Device power 9 – 24 V
Power consumption 0,5 W
Reverse polarity protection yes
Operation temperature range* from -40 up to +100 °С
Electromagnetic compatibility
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 thermal resistance

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

  • Product version

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

Functions

of digital temperature sensors ZET 7021

Digital temperature sensor ZET 7021 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.

Directive 2011/65/EU (ROHS, ROHS II)

DIGITAL TEMPERATURE SENSORS MEET THE REQUIREMENTS OF DIRECTIVE 2011/65/EU (ROHS, ROHS II) CONCERNING LIMITATION TO USE HAZARD SUBSTANCES (PB, HG, CD, CR(VI)) IN ELECTRICAL AND ELECTRONIC EQUIPMENT; THEY ARE MANUFACTURED USING LEAD-FREE METHOD, IN COMPLIANCE WITH THE EUROPEAN COMMUNITY REQUIREMENTS

Operation principles

of digital temperature sensors ZET 7021

Digital temperature sensor consists of resistance thermal converter and ZET 7021 module which converts the signal from the sensor into temperature readings data.

Type of thermal resistance is to be set in accordance with features of particular task (required measuring range, precision and operational environment).

Принцип работы цифрового датчика температуры ZET 7021

Digital sensor  ZET 7021 starts temperature measurements 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.

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 7021

Connection of digital temperature sensors  ZET 7021 to a PC can be done 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.

Digital temperature sensors  ZET 7021 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.

Control

of digital temperature sensors ZET 7021

Digital temperature sensor ZET 7021 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”.

Конфигурирование ZET 7021

Configuration management

Parameter Possibility of changes Acceptable values Description
Thermal resistance Yes Resistor
100П; 50П;
Pt100; Pt50;
100M; 50M;
Cu100; Cu50; 100H; 50H
Value «Resistor» should be set for resistance measurements. The remaining values are set depending on the particular type of the primary transducer used.
Frequency, Hz Yes 10; 50 Sensor data frequency
Minimum measured temperature value Yes The parameter determines minimum measuring value of the digital sensor. The value is to be set in accordance with technical specifications of primary transducers used together with the digital sensors.
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 °С
Ohm
Is determined based on the particular thermal resistance type.
(for «Resistor» value – Ohm, for all the rest values – °С).
Sensor serial number Yes The parameter is set only if it is necessary to identify the serial number of the sensor connected to the module ZET7X21.

Basic configuration

of digital temperature sensors ZET 7021

Вариант базовой комплектации

Basic configuration of digital temperature sensor includes:

  • digital sensor ZET 7021;
  • DIN-rail mounting panel for plastic modules 71×39;
  • set of operational documentation.

From 67 USD

* Minimum order value: from 7 700 USD

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