TEP1- temperature measurement with RS485 output

• High temperature measurement accuracy (± 0.2 °C)

• Low transmission temperature dependence (5 ppm)

• Temperature resolution up to 0.002 °C

• Mechanical dimensions TEP1/K adapted to the radiation cover RK5

• Submersible drainage sump pump TEP1/H with fixed cable

• Four-wire connection of external Pt100 sensors to TEP1/E

• Reading of measured temperatures via RS485 at a distance of up to 500 m

• FINET or Modbus RTU communication protocols

• Compatible with all FIEDLER AMS telemetry stations

Basic description

The TEP1 converter converts the temperature sensed by the Pt100 sensor into a digital signal transmitted to the connected system via the RS485 bus.

The measuring electronics controlled by a microprocessor is housed in a cylindrical plastic housing with a diameter of 16 mm and ensures accurate measurement and calculation of temperature with a typical error not exceeding 0.1 °C in the range from -30 °C to +50 °C. In the entire operating range from -50 °C to + 80 °C, the typical temperature measurement error is less than 0.3 °C. High accuracy and stability of measurement allows the use of high resolution of the measured temperature, which can be set by the user in the connected recording unit. The converter works with minimal noise without fluctuations and with a resolution of 0.002 °C.

As a measuring sensor, the probe uses a Pt100 temperature resistor in accuracy class A with dimensions of only 2.5 x 5 mm, which is characterized by low thermal inertia and high stability over time.

Mechanical design

The TEP1 temperature transmitter is available in 3 basic versions:

• TEP1/H - water temperature measurement

• TEP1/K - air temperature measurement

• TEP1/E - surface temperature measurement by external sensor

Air temperature measurement (TEP1/K)

When measuring air temperature, the TEP1/K probe is usually placed in the RK5 or RK7 radiation shield.

When measuring air, the temperature sensor is placed outside the probe body so that the temperature is not affected by the probe itself. In justified cases, the Pt100 temperature sensor can be placed at a distance of several meters from the TEP1 probe, because the connection between the probe and the sensor itself is made in four wires and the length of the connecting cable does not affect the measurement accuracy.

Surface temperature measurement of small objects (TEP1/E)

The TEP1/E transmitter does not contain a Pt100 temperature sensor, but only a 4-pin M12 connector, through which the sensor located at the opposite end of the cable is connected to the transmitter. This mechanical design is used especially when measuring surface temperatures in botany, construction and everywhere where it is necessary to measure the temperature with a non-standard sensor shape (small sensors or sensors equipped with mounts) and where the dimensions and thermal inertia of the transmitter itself would cause an error in temperature measurement.

The maximum cable length between the TEP1/E transmitter and the Pt100 sensor itself can be up to 100 m. The temperature sensors are connected to the transmitters in four wires and therefore the cable length does not affect the measurement accuracy.

Water temperature measurement (TEP1/H)

The immersion version of the TEP1/H probe used to measure the water temperature has a temperature sensor embedded together with the probe electronics into one unit that can be permanently immersed in water.

In order for the temperature inertia of the probe to be acceptable even in this case, the sensor is located just below the surface of the potting compound at the end of the probe..

High measurement accuracy

The top measuring electronics controlled by a microprocessor is located in the body of the probe and ensures accurate measurement and calculation of temperature with a typical error not exceeding 0.1 °C in the range from -30 °C to +50 °C. In the entire operating range from -50 °C to + 80 °C, the typical temperature measurement error is less than 0.3 °C. High accuracy and stability of measurement allows the use of high resolution of the measured temperature, which can be set by the user in the connected recording unit. The probe works with minimal noise without fluctuations and with a resolution of 0.002 °C.

Note on setting the recording channel parameters of the connected unit:

When setting the recording channel resolution of the connected M4016, H1, H40 or STELA unit, keep in mind the maximum temperature range that can be used in the recording units for that resolution. The lowest temperature range from -32,500 °C to +32,500 °C applies to a resolution of 0.001 °C (eg for a resolution of 0.1 °C, a temperature range from -3,250.0 °C to +3,250.0 °C can be used).

The range limitation is related to the format of the archived data in the connected recording unit, which uses a 16-bit word. The TEP1 converter itself does not have this limitation and the data is transferred to the recording unit in a long unlimited format.

The meaning of other parameters of the connected recording unit important for the correct archiving of data from the TEP1 converter is always described in detail in the relevant user manual of the specific recording unit. 

Connection of the TEP1 probe to the recording unit

The measured temperature value is transmitted to the connected recording unit via the RS485 serial bus. This method of communication eliminates the occurrence of an additional measurement error on the analog input side of the recording unit.

Another advantage of RS485 serial communication is the possibility of parallel connection of several probes to one recording unit. The probe communicates on the RS485 bus under the FINET or Modbus RTU protocol and can therefore be connected to all FIEDLER AMS units (M4016, H1, H2, H3, H7, Q2, E2, H40 or STELA) without any problems.

Documentation: 

Datasheet

TEP1

Download: 

Price list

Price List 2024