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Immersion Temperature Sensor with ABS head

immersion temperature sensor with abs head TPA-2-N

The TPA-2-N is an immersion type temperature sensor, which uses a 3-wire PT100 or PT1000 Platinum Resistance Thermometer (PRT) to BS 1904, for precision temperature measurements.

Immersion Temperature Sensor TPA-2-N Introduction

The TPA-2-N is an immersion temperature probe, manufactured in 316 stainless steel and utilising a 3-wire PRT to BS 1904 standard.

The TPA-2-N has an ABS mounting head, secured in place with a threaded lock nut to seal the internal connections against atmospheric conditions. The temperature assembly is manufactured in 316 Stainless Steel with an all-welded construction to food grade standards.

The PT100 or PT1000 platinum resistance thermometer is located in the tip of the stainless steel stem which is filled with our special thermal packing material.

The stem of the TPA-2-N is 6mm Ø and is straight, from the end of the ABS mounting head to the tip of the sensor.  We can manufacture a temperature sensor with a bend in it, if required.  The TPA-2-N is designed to be immersed into the measured liquid, either by suspending the TPA-2-N assembly from a mounting bracket above a tank or open vessel, or alternatively, the TPA-2-N can be secured into place using a temperature pocket with a compression fitting, such as our TPP Temperature Pocket.

The length of the sensor from the tip to the process connector is 150mm as standard.  We can manufacture the TPA-2-N with a longer insertion length as required.

The TPA-2-N is suitable for measuring the temperature of processes in tanks or in pipework, either immersed into the tank or via a temperature pocket, where the chemical doesn't react with 316 Stainless Steel.

We rate the TPA-2-N for measuring a temperature range of -50.0°C to + 250.0°C. 

Insertion Temperature Sensor TPA-2-N 3 Wire PRT PT100 / PT1000

Inside the ABS head of the TPA-2-N is a terminal block, allowing the 3 wire PRT to be wired into a temperature controller or other instrument which takes an input from a PT100 or PT1000.

As a 3 wire device, the resistance in the cable that connects the insertion temperature sensor to the instrument is negated by measuring the cable resistance of the third wire. This ensures that the temperature is measured accurately and precisely.

For applications with long cable runs or if connecting directly to a  4-20mA controller, PLC or online Data Logger, then our TT100 4-20mA Temperature Transmitter is designed to be mounted inside the head of the insertion temperature sensor and gives a 4-20mA output signal.

Thermowell Installation TPA-2-N

The TPA-2-N is easily installed into a thermowell / Temperature Pocket using a compression fitting only.  When ordering please ensure that the length of the sensor is the same or slightly shorter than the temperature pocket.

Immersion Temperature Sensor TPA-2-N Features & Benefits

The TPA-2-N is an excellent way of measuring liquid temperature for control or monitoring purposes, whether in process, water treatment and effluent treatment applications.

The 3-Wire PRT is a precision device to BS 1904 and can be either a PT100 or PT1000 depending upon the connecting instrument.

The all-welded construction makes the TPA-2-N suitable for food grade applications and allows installation either via insertion using a thermowell or temperature pocket, or simply by Dip mounting or immersion of the sensor body, into the tank or vessel.

The ABS head allows the electrical connection to be locked into place and combined with the connecting gland, prevents any ingress of fluids into the head of the temperature sensor. This could inhibit the operation of the insertion temperature sensor.

The TPA-2-N can be paired with any instrument that takes a 3 Wire PRT input, or one of our temperature controllers, and is designed to offer the user a long operational life, while providing accurate temperature measurements.

TPA-2-N Specifications

  • Specifications


    Immersion Temperature Sensor with ABS Head

    Model No:- TPA-2-N

    Range:- -50°C to + 250°C

    Installation:- Immersion or insertion via thermowell

    Mounting:- Immersion or SS compression fitting to thermowell

    Housing Material:- ABS

    Sensor Material:- 316 Stainless Steel all welded construction to food grade standards

    Sensor Type:- PT100 or PT1000 to B.S. 1904

    Diameter:- 6mm Ø as standard

    lagging:- N/A

    Insertion Length:- Standard 150mm 

  • Ordering Information

    Model NumberHead MaterialInsertion Length
    TPA-2-N-XX Nylon (ABS) XX = length in mm
    TPA-2-A-XX Aluminium XX = length in mm

    For temperature sensors with a process connection please see model TPA-1-A with an Alumium Head with an Aluminium Head or TPA-1-N for an ABS (Nylon) head

    Each temperature sensor can be manufactured with a custom lagging distance - please call or message our friendly sales team for more information.


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