ZET 7120 Digital Temperature Sensor

  • digital output CAN 2.0
  • primary transducer type: thermocouple
  • CAN 2.0 inteface, temperature detector

POR (price on request)


of the ZET 7120 Digital Temperature Sensors

Metrological Data
Measured value temperature
Minimum measured temperature value -270 °C (depending on the thermocouple used)
Maximum measured temperature value 2,500 °C (depending on the thermocouple used)
Sensitivity threshold (minimum difference between sequentially measured values) 0.001 °C
Absolute measurement error (with type T thermocouple, 1 tolerance class) 0.5 %
Relative measurement error (of the measured value) 0.05 %
Additional measurement error (due to temperature measurement) 0.05 %/10 °C
Real-time operation control temperature in the sensor, synchronization and data quality
Measurement quality check sensing element integrity check
measuring track check
Technical Specifications
Type of connected thermocouples R, S, B, J, T, E, K, N, A1, A2, A3, L, M
Connected primary transducers (PT) electric voltage measuring range -73 to +73 mV
Cold junction compensator yes, embedded
Data refresh rate 1; 4 Hz
Data interface CAN 2.0
Transmission rate 100, 300, 1,000 kbps
Performance Specifications
Dimensions 71×39×17 mm
Weight 30 g
Power supply 9 to 24 V
Consumed power 0.5 W
Reverse polarity protection yes
Operational temperature range -40 to +100 °C
Electromagnetic Compatibility, EMC
IEC 61000-4-2, ESD contact 4 kV, air 8 kV
IEC 61000-4-4, EFT power supply 0.5 kV, signal 0.25 kV
IEC 61000-4-5, Surge 500 V
  • Hardware Versions

    Standard: laboratory design in a plastic cover (green)
    OEM: board covered with a sealing compound.
    Heavy Duty*: depending on the task specifics, this may be a version in a heavy duty cover (black) or location of the standard-design unit in an air-tight cover (with a transparent lid).
    *Cost is calculated individually


of the ZET 7120 Digital Temperature Sensors

No adjustment is needed

The characteristics are stored in the measuring unit memory

Measurement Results

Measurement results are transmitted in a digital form

Power Supply

The primary transducer is powered by the measurement unit


Stable characteristics and high reliability in operation

Operation Principle

of the ZET 7120 Digital Temperature Sensors

The ZET 7120 measuring unit in combination with the thermocouple constitute the digital temperature sensor.

The ZET 7120 unit converts signal from the sensor into temperature values. The resulting temperature values are transmitted via CAN interface. Thus, the use of digital sensors releases the user from the necessity of the measuring channels setting.

Thermocouple type is selected in accordance with the specifics of the task to be solved: measurement and accuracy required ranges, operation conditions.

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



Connection Diagrams

of the ZET 7120 Digital Temperature Sensors

Connection to a PC may be via USB, Ethernet, Wi-Fi, GSM; data can also be transmitted via a radio channel, see Interface Converters section. Interface converter supply package includes ZETLAB software which significantly enhances opportunities of using the digital temperature sensors.

The digital sensors are ideal for building distributed monitoring systems and for temperature control. Signal processing at the measurement point enables  high measurement accuracy and allows using inexpensive cables may for signal transmission.

The digital sensors may operate in standalone mode, for instance, in an automated temperature control system as well as in monitoring systems. To set the device operation scenario and for results display on a PC, ZETLAB SENSOR software is used which is supplied with the interface converters.

Joint operation of the digital sensors and controllers makes it possible to build control systems, automated complexes, and various control devices.


When ordering a thermocouple, make sure its cable length is sufficient since any cable extension not agreed upon with the manufacturer influences the thermocouple metering characteristics.


of the ZET 7120 Digital Temperature Sensors

The ZET 7120 digital temperature sensor starts temperature measurement right after being powered on and does not require specific technical maintenance. All necessary settings are set during the primary and planned calibrations and stored in the measuring unit memory. The resulting temperature values are transmitted via CAN 2.0 interface.

When a primary transducer is replaced, it is necessary to update the unit settings. For this purpose, connect the unit to a PC, launch the “ZETLAB – Device Manager” software and set the sensor parameters on the “Thermocouple” tab.



Parameter Changeability Acceptable values Description
Thermocouple type Yes Voltage
Type (R, S, B, J, T, E, K, N, A1, A2, A3, L, M)
Set the “Voltage” value when voltage is measured. Set the “Resistor” value when resistance is measured. Set the “CJB” value when cold junction temperature is measured. Other parameters are set depending on the PT type used.
Frequency (Hz) Yes 1; 4 Frequency at which the gauge will generate data.
Minimum measured temperature value Yes This parameter defines the minimum value of the unit measurement. The value shall be set in accordance with the technical specifications of the primary transducers used in combination with the unit.
Maximum measured temperature value Yes This parameter defines the maximum value of the unit measurement. The value shall be set in accordance with the technical specifications of the primary transducers used in combination with the unit.
Measurement unit Yes °C
Defined depending on the thermocouple type selected (mV for “Voltage”, Ohm for “Resistor”, and °C, for all other parameters).
Displacement Yes On
This parameter value shall always be set to “ON”.
Gauge serial number Yes Set this parameter only when identification of the sensor serial number connected to ZET 7120 unit is required.

Test impacts types

AC - Alternating signal

FR: «Required frequency value»: «Frequency tolerance» – alternating signal frequency;

AM: «Required signal amplitude value»: «Signal amplitude tolerance» – alternating signal amplitude;

OF: «Generated signal bias»: «Generated signal bias tolerance» – generated signal bias;

TM: «Signal analysis time» – signal control time (minimal signal analysis time for transient processes or long-time tests)

Alternating signal with frequency: 0.5 ± 0.01 Hz, amplitude: 0.4 ± 0.002 V, bias: 0.1 ± 0.0001 V, minimal signal control time – 5 s.

DC - constant signal

LE: «Required signal level»: «Signal level tolerance» – generated signal level.

TM: «Signal analysis time» – control signal time (signal analysis minimal time for transient and long-time processes tests)

constant signal: 0.5 ± 0.001 V, minimal signal control time – 5 s.

ST1 - stepwise change

AM: «Minimal value»: «Maximum value» – change range.

TM: «Signal setting time» – time before signal control start

stepwise change: for 100..200 units, minimal signal control time – 5 s.

ST2 - stepwise change

MD: «Minimal change»: «Maximum change» – change range.

TM: «Signal setting time» – time before signal control start

stepwise change:  10..10.5 units in modulus, minimal signal control time – 6 s.

PPS - Pulse-per-second signal

SP: «Acceptable counts deviation» – amount of counts before or after start of a second.

Level change to be checked one time in a second.

PPS;SP:2 –
the change should take place in the beginning of a second, 2 counts.

Device type is selected from the dropdown list. In order to select a device, pick an element with left mouse key and choose a device to be checked from the list.

Use selector to set particular test. To set the test number click the number with left mouse key and set the required value by scroll. If the self-check is on, the selector will not be available until the user stops the project or the self-check is over. There is a key for start / stop of the process. The green key means that the diagnostics process is on, grey key stands for  for idle state.

Indicator is a timer showing the elapsing time of the current test. The countdown is started after beginning of any test. Test results are available in the log.

Basic configuration

of digital thermal sensors ZET 7120

Standard equipment

Temperature detector supply scope includes:

  • Digital temperature sensor ZET 7120;
  • DIN-rail mounting panel for plastic modules 71×39;
  • set of operational documentation.

POR (price on request)

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Necessary measuring equipment

supplied upon special order

ZET 7174
ZET 7174
USB connection

ZET 7176
ZET 7176
Ethernet connection