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  • New item   -8.22€Passive duct temperature sensor | PT500 | 250mm | -50-80°C | IP30 | Sentera Controls | TUTSN-P500-250

    Passive duct temperature sensor | PT500 | 250mm | -50-80°C | IP30 | Sentera Controls | TUTSN-P500-250

    Code: TUTSN-P500-250
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  • Product description

    Passive duct temperature sensor | PT500 | 250mm | -50-80°C | IP30 | Sentera Controls | TUTSN-P500-250

    TUTSN-P500-250 – Sentera Controls passive duct temperature sensor with a platinum PT500 element in a 250 mm long plastic tube. Intended for ducts with a diameter larger than 300 mm, measuring range -50…+80 °C.

    Key idea:
    When ventilation automation needs to know the supply or extract air temperature and the controller has a PT500 input, this sensor is the simplest solution: insert it into the duct, connect two wires, and that is all.
    Sensing element
    PT500 (500 Ω at 0 °C)
    Tube length
    250 mm (for ducts over 300 mm)
    Measuring range
    -50…+80 °C
    Protection class
    IP30

    Operating principle

    The 250 mm plastic sensor tube is inserted through a hole into the duct so that the element sits in the middle of the airflow – this length is chosen for ducts with a diameter above 300 mm. Install at temperatures above -5 °C; the 1 m 0.5 mm² wires are extended to the controller.

    The resistance of the platinum PT500 element (500 Ω at 0 °C) increases linearly with temperature per IEC 60751 / DIN EN 60751; the controller supplies a 0.1–0.3 mA measuring current and calculates the temperature from the resistance.

    Result – duct air temperature within -50…+80 °C with F0.3 class accuracy: error ±(0.30 + 0.005·|T|) °C, i.e. ±0.40 °C at 20 °C. The sensor is passive, with no 0-10 VDC or Modbus output, intended for dry, non-corrosive environments only; if the controller has no PT500 input, choose the Modbus duct sensor DTS-M.

    Benefits TUTSN-P500-250?
    The wide range of -50…+80 °C covers both outdoor air and heated supply air temperatures, and the standard PT500 element suits most ventilation unit controllers.

    Technical specifications

    Product type Passive duct temperature sensor (platinum resistance, RTD)
    Manufacturer / code Sentera Controls / TUTSN-P500-250
    Series TUTSN (PT500 / PT1000; 150 / 250 mm)
    Sensing element PT500, nominal resistance 500 Ω at 0 °C
    Measuring range -50…+80 °C
    Accuracy class F0.3, error ±(0.30 + 0.005·|T|) °C
    Measuring current (DC) 0.1–0.3 mA
    Self-heating ≤ 0.5 K/mW (at 1 m/s airflow)
    Tube Plastic, 250 mm
    Duct diameter Larger than 300 mm
    Wires 1.0 m, 0.5 mm²; pull force < 5 N
    Protection class IP30 (EN 60529)
    Operating environment -50…+80 °C, < 95 % rH non-condensing
    Installation temperature Above -5 °C
    Weight 0.37 kg (net, 1 pc.)
    Compliance IEC 60751 / DIN EN 60751, 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

    • Platinum PT500 element – standardized characteristic, no calibration needed.
    • Wide range -50…+80 °C – suitable for outdoor, supply and extract air ducts.
    • 250 mm tube – the element reaches the middle of the airflow in ducts over 300 mm in diameter.
    • Accuracy class F0.3 – ±0.40 °C at 20 °C – sufficient for supply air temperature control.
    • Self-heating ≤ 0.5 K/mW – at an airflow of 1 m/s the measuring current practically does not distort the readings.
    • 1 m wires – can be extended up to the controller.
    • No power supply needed – no separate power line is needed.

    Where is it used?

    • Main commercial building ducts above Ø300 mm
    • Supply air temperature downstream of a heater or cooler
    • Extract air ducts
    • Outdoor (fresh) air ducts down to -50 °C
    • Heat recovery unit automation
    • BMS duct temperature monitoring
    • Replacing existing PT500 duct sensors

    On-demand operation

    For commercial building ventilation installers.
    The 250 mm tube reaches the middle of the airflow in ducts with a diameter above 300 mm.
    For HVAC commissioning engineers.
    An element in the middle of the flow shows the true supply air temperature, so heater control can be tuned more accurately.
    For building administrators.
    A passive PT500 sensor with no electronics – nothing to configure or maintain.

    Practical application

    If the supply air duct of an office building ventilation unit is Ø400 mm, then the TUTSN-P500-250 with a 250 mm tube reaches the middle of the flow and passes the temperature to the controller's PT500 input.

    Application guide: how it is used in practice

    TUTSN-P500-250 is suitable wherever the controller has a PT500 input and the duct diameter is larger than 300 mm:

    Site What is connected Result Installer's note
    Air handling unit with an electric heater TUTSN-P500-250 in the supply air duct → controller PT500 input Heater output is regulated according to the supply air temperature Install downstream of the heater, where the air is already mixed
    Heat recovery unit TUTSN-P500-250 in the outdoor air duct The controller knows the outdoor temperature – frost protection, mode switching The temperature during installation must be > -5 °C
    Extract air duct TUTSN-P500-250 → BMS Extract air temperature is used as an indicator of room temperature Only for dry, non-corrosive environments
    Water heater protection TUTSN-P500-250 downstream of the water heating coil The controller monitors the air temperature downstream of the heating coil Use shielded cable for a longer line

    How to choose a sensing element and length

    Controller input / duct diameter Recommended model
    PT500, duct < 300 mm TUTSN-P500-150 (PT500, 150 mm)
    PT500, duct > 300 mm TUTSN-P500-250 (PT500, 250 mm) ← this model
    PT1000, duct < 300 mm TUTSN-P1K0-150 (PT1000, 150 mm)
    PT1000, duct > 300 mm TUTSN-P1K0-250 (PT1000, 250 mm)
    Rule: the element (PT500 or PT1000) must match the controller input; tube length – 150 mm for ducts up to 300 mm, 250 mm for ducts larger than 300 mm.
    When to choose another solution: for a room – ROTSN series (wall-mounted, PT100 / PT500 / PT1000); with a cable or for immersion – FLTSN series; with a Modbus RTU output – DTS-M-080 / DTS-M-160.

    Pros

    • Wide range -50…+80 °C
    • 250 mm tube for ducts above 300 mm
    • Standard platinum PT500 element
    • Accuracy class F0.3
    • No power supply or settings needed
    • Simple installation through a hole in the duct

    Cons / limitations

    • No 0-10 VDC or Modbus output – a controller with a PT500 input is required; for a Modbus system choose DTS-M-080 / DTS-M-160
    • IP30 – dry, non-corrosive environment only
    • The installation temperature must be above -5 °C
    • Wire pull force < 5 N – do not pull on the wires

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified installer.
    • Use only in a dry, non-corrosive environment.
    • Install when the ambient temperature is above -5 °C.
    • Do not pull the sensor by its wires (pull force < 5 N).
    • For extension use a shielded cable, away from 230 V lines.

    Quick selection guide

    PT500
    250 mm
    -50…+80 °C
    Duct
    IP30
    Suitable when you need:
    • to measure air temperature in a duct with a diameter larger than 300 mm;
    • to connect to a controller or BMS with a PT500 input;
    • to replace an old passive duct sensor.
    Check before use:
    • the controller input type (PT500 or PT1000);
    • the duct diameter – 150 or 250 mm tube;
    • whether the environment is dry and non-corrosive.
    Important reminder: TUTSN-P500-250 – a passive sensor; it will not work with a controller that accepts only a 0-10 VDC or Modbus signal.

    FAQ

    What tube length should I choose?
    The 150 mm tube is for ducts up to 300 mm, and the 250 mm tube is for ducts larger than 300 mm.
    What is the measuring range?
    The sensor measures in the -50…+80 °C range.
    Can the wires be extended?
    Yes, extend the standard 1 m leads with a shielded cable.
    Is a power supply needed?
    No, the measuring current is supplied by the controller.
    Is it suitable for humid extraction, for example in a swimming pool?
    No, the sensor is intended only for dry, non-corrosive environments (IP30).
    Can it be mounted outdoors in winter?
    It can be installed only at temperatures above -5 °C, after which the sensor works down to -50 °C.

    Passive duct temperature sensor | PT500 | 250mm | -50-80°C | IP30 | Sentera Controls | TUTSN-P500-250

    Sentera TUTSN-P500-250 – passive duct PT500 temperature sensor with a 250 mm tube, range -50…+80 °C and accuracy class F0.3 for ventilation unit controllers.

    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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