Digital temperature sensor ZET 7021

Type of sensors connected: thermal resistance
RS-485 data interface
Ready for operation

POR (price on request)

* 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 °C
Absolute measuring tolerance (with a thermal resistance of AA class)	±0,1 °C
Relative measuring tolerance (from the measured value)	0,05 %
Additional measuring tolerance (depending on temperature changes)	0,05 %/ 10°C
Technical specifications
Nominal static characteristics of connected primary transducers	100P(0,00391), 50P(0,00391), Pt100(0,00385), Pt50(0,00385), 100M(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 °C
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.
OEM: 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).

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.

Specialized calculator

for calculating the required type of cables in the construction of measuring lines

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”.

Configuration management

Parameter	Possibility of changes	Acceptable values	Description
Thermal resistance	Yes	Resistor 100P; 50P; 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	°C Ohm	Is determined based on the particular thermal resistance type. (for «Resistor» value – Ohm, for all the rest values – °C).
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

Basic configuration of digital temperature sensor includes:

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

POR (price on request)

* Minimum order value: from 7 700 USD

Data protection notification

Please note that the personal data provided by you is used exclusively for the purposes of fulfilling our contractual obligations, including, but not limited to: issuing invoices, delivery documents, documentation relating to customs clearance process, etc. We do not provide your personal data to any third party except for the purposes relating to our direct contractual obligations. Upon completion of order processing and expiry of the warranty period for the Products provided by our Company, we do not store or process any of your personal data. Please note, that our Company’s Confidential policy does not imply any advertising or marketing activities with the use of your personal data (including your Company name, address, your E-mail, phone number and other information provided by you with a view to placing an Order and organization of the Delivery).

Necessary measuring equipment

supplied upon special order

ZET 7070 interface converter
USB connection

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

Digital temperature sensor ZET 7021

Specifications

Product version

Functions

Operation principles

Connection schemes

Specialized calculator

Control

Basic configuration

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Data protection notification

Necessary measuring equipment

ZETLAB

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