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  • New item   -22.71€Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M
    New item   -22.71€Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M 1
    New item   -22.71€Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M 2
    New item   -22.71€Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M 3
    New item   -22.71€Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M 4

    Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M

    Code: DTP-M
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  • Product description

    Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M

    DTP-M – a Sentera Controls digital strap-on (pipe-mounted) temperature transmitter with Modbus RTU (RS485) communication. It measures water pipe temperature of 0…+85 °C with ±1 °C accuracy and is powered by 24 VDC via Modbus (PoM) through the RJ45 socket.

    Key idea:
    Pipe temperature without a thermowell and without breaking into the piping: the sensor is pressed against the pipe, and the temperature travels over the Modbus RTU network to the controller or BMS.
    Measuring range
    0…+85 °C, ±1 °C
    Communication
    Modbus RTU (RS485)
    Power supply
    24 VDC via Modbus (PoM), RJ45
    Protection
    IP65, included

    Operating principle

    The transmitter is attached to the pipe with the supplied heat-resistant 300 × 4.8 mm cable tie; the copper plate improves heat transfer, and the thermal pad (19 × 14 × 1.5 mm) ensures good contact with the pipe surface. A cable with the 24 VDC supply and Modbus RTU signals (A, /B, GND) is connected to the RJ45 socket.

    Temperature is measured within 0…+85 °C with ±1 °C accuracy and provided in Modbus registers; the left green LED shows power, and the blinking green LEDs show active Modbus communication.

    Result – pipework temperature in the BMS or controller without a thermowell and without draining the system. The sensor measures the pipe wall temperature: it is close to the water temperature when the pipe is metal and the sensor location is insulated; on plastic pipes the readings are less accurate.

    Benefits DTP-M?
    Installation without dismantling the piping and without a thermowell, with power and data in a single RJ45 cable.

    Technical specifications

    Product type Strap-on pipe temperature transmitter with Modbus RTU
    Manufacturer / code Sentera Controls / DTP-M
    Measuring range 0…+85 °C
    Accuracy ±1 °C
    Communication Modbus RTU (RS485)
    Power supply 24 VDC via Modbus (PoM)
    Energy usage Max. 0.192 W; Imax 8 mA
    Connection RJ45 (8 pins): +24 VDC, A, /B, GND
    Thermal contact Copper plate, thermal pad 19 × 14 × 1.5 mm
    Mounting Heat-resistant cable tie 300 × 4.8 mm (included)
    Indication Green LED – power; blinking green LEDs – Modbus communication
    Protection class IP65
    Operating environment -30…+85 °C, 5–95 % rH non-condensing
    Weight 0.024 kg (net)
    Compliance EMC 2014/30/EU (EN 61326-1, EN 61326-2-3), WEEE 2012/19/EU, RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

    Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

    Main functions

    • Modbus RTU (RS485) – the temperature is read by a controller, BMS or SCADA.
    • Power over Modbus – 24 VDC over the same RJ45 cable.
    • Copper plate and thermal pad – good thermal contact with the pipe.
    • Series resistor included – 300 × 4.8 mm, heat-resistant – installation without additional parts.
    • Range 0…+85 °C – covers heating and hot water circuit temperatures.
    • Low costs – up to 0.192 W (Imax 8 mA) from the PoM line.
    • LED indication – power and communication status.
    • IP65 – suitable for technical rooms and heat substations.

    Where is it used?

    • Supply and return water monitoring of heating circuits
    • Water heating coil piping in ventilation units
    • Heat substations and boiler rooms
    • Heat pump systems
    • Hot water preparation circuits up to +85 °C
    • Modernization of existing systems without dismantling the piping
    • BMS pipework temperature monitoring

    On-demand operation

    For heating installers.
    No thermowell or piping dismantling needed – the transmitter is secured with a cable tie.
    For heat pump installers.
    Two DTP-M units on the supply and return pipes give the temperature difference in the Modbus network.
    For building energy managers.
    Pipework temperatures in the BMS help evaluate the efficiency of heating circuits.

    Practical application

    If the return water temperature of a running heating circuit has to be added to the BMS without draining the water, then the DTP-M is clamped with a cable tie to the metal pipe, the spot is insulated, and the 0…+85 °C temperature is passed over the Modbus RTU network with ±1 °C accuracy.

    Application guide: how it is used in practice

    The DTP-M is placed on the pipe, and the temperature travels over the Modbus RTU network:

    Site What is connected Result Installer's note
    Water heating coil DTP-M on the return water pipe → Modbus The controller monitors the return water temperature Insulate the transmitter location
    Heating circuit DTP-M on the supply pipe → DPOM8-24-20 → BMS Supply water temperature in the BMS Metal pipe – more accurate readings
    Heat pump Two DTP-M on the supply and return pipe Temperature difference for evaluating system efficiency Different Modbus addresses
    Retrofit without dismantling DTP-M instead of an immersion sensor No need to drain the water or install a thermowell Clean the pipe surface

    How to choose a Modbus temperature transmitter

    Installation location / probe Recommended model
    Duct, 85 mm probe DTS-M-080 (duct, 85 mm)
    Duct, 165 mm probe DTS-M-160 (duct, 165 mm)
    Water pipe, strap-on DTP-M (pipe, 0–85 °C) ← this model
    DTS-M wall fixing DTS-MB-BK-ASM (bracket)
    Rule: for water pipes – DTP-M (0…+85 °C) is attached; for air ducts – DTS-M-080 or DTS-M-160 depending on the duct size.
    When to choose another solution: passive sensors for controllers with a PT input – TUTSN (duct), ROTSN (room), FLTSN (with cable); for power and the Modbus line – DPOM8-24-20 (Power over Modbus module with a repeater).

    Pros

    • Installation without a thermowell and without dismantling the piping
    • Modbus RTU
    • 24 VDC Power over Modbus
    • RJ45 connector
    • IP65
    • Series resistor and thermal pad included

    Cons / limitations

    • Accuracy ±1 °C
    • Measures the pipe surface temperature, not the water temperature directly
    • No analog output – a Modbus controller is required; for a controller with a PT input choose the FLTSN series with a thermowell
    • Range up to +85 °C
    • A 24 VDC Modbus power supply is required – the DPOM8-24-20 is intended for this

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified installer with the power disconnected.
    • Power supply 24 VDC only, via Modbus.
    • Do not exceed a pipe temperature of +85 °C.
    • Keep the cable away from hot surfaces.

    Quick selection guide

    Modbus RTU
    24 VDC PoM
    RJ45
    0…+85 °C
    IP65
    Suitable when you need:
    • to measure water pipe temperature on a Modbus RTU network;
    • to install a sensor without a thermowell;
    • to reduce the number of wires with Power over Modbus.
    Check before use:
    • whether the pipe temperature does not exceed +85 °C;
    • whether there is a Modbus RTU controller and 24 VDC PoM power;
    • the pipe material (metal – more accurate readings).
    Important reminder: The DTP-M has no PT or 0-10 VDC output – it works only on a Modbus RTU network.

    FAQ

    Is a thermowell needed?
    No, the transmitter is attached to the pipe surface and secured with a cable tie.
    What is the measuring range?
    The transmitter measures 0…+85 °C with ±1 °C accuracy.
    How is the transmitter powered?
    It is powered at 24 VDC over Modbus (PoM) via the RJ45 socket.
    Can it be used in a duct?
    No, for ducts the DTS-M-080 and DTS-M-160 are intended.
    Is it suitable for a plastic pipe?
    Suitable, but the readings will be less accurate than on a metal pipe.
    Does the measuring point need to be insulated?
    Yes, an insulated location gives readings closer to the true water temperature.

    Strap-on pipe temperature transmitter | 0-85°C | Modbus RTU | 24VDC PoM | RJ45 | IP65 | Sentera Controls | DTP-M

    Sentera DTP-M – strap-on pipe temperature sensor 0…+85 °C with Modbus RTU, 24 VDC Power over Modbus supply via RJ45, copper plate and IP65.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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