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Insertion Temperature Sensor with ABS head

insertion temperature sensor with abs head TPA 1 N

The TPA-1-N is an insertion type temperature sensor which uses a 3-wire PT100 or PT1000 Platinum Resistance Thermometer to BS 1904 for precision temperature measurements.

Insertion Temperature Sensor TPA-1-N Introduction

The TPA-1-N is an insertion temperature probe manufactured in 316 stainless steel and utilising a 3-wire PRT to BS 1904 standard.

The TPA-1-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.

Located on the stem of the insertion temperature sensor is a 1/2" BSP male fitting which allows the TPA-1-N to be screwed directly into a process fitting or into a temperature pocket. The 1/2" BSP male process connector is 75mm from the ABS head of the temperature sensor - this is referred to as the 75mm lagging distance.

The length of the sensor from the tip to the process connector is 150mm as standard and we can manufacture the TPA-1-N with a longer insertion length as required.

The TPA-1-N is suitable for measuring the temperature of processes in tanks or in pipework either screwed directly into the process or through a thermowell or temperature pocket where the chemical doesn't react with 316 Stainless Steel.

We rate the TPA-1-N is rated for measuring a temperature range of -50.0°C to + 250.0°C. 

Insertion Temperature Sensor TPA-1-N 3 Wire PRT PT100 / PT1000

Inside the ABS head of the TPA-1-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 give a 4-20mA output signal.

Insertion Temperature Sensor TPA-1-N Installation

The TPA-1-N is easily installed into a process connector or a temperature pocket / thermowell - ensuring that the length of the sensor is the same or slightly shorter than the temperature pocket / or insertion distance, the TPA-1-N is simply screwed into place.

The process connector is a 1/2" BSP threaded connection as standard and has 75mm lagging between the head and the base of the process connector.

Insertion Temperature Sensor TPA-1-N Features & Benefits

The TPA-1-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 precision device to B.S. 1904 and can be either a PT100 or PT1000 depending upon the connecting instrument.

The all welded construction makes the TPA-1-N suitable for food grade applications and the 1/2" boss makes securing the TPA-1-N into a thermowell, temperature pocket or direclty into a process with a female socket as simple as possible.

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 - which could inhibit operation of insertion temperature sensor.

The TPA-1-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 providing accurate temperature measurements.

TPA-1-N Specifications

  • Specifications


    Insertion Temperature Sensor with ABS Head

    Model No:-TPA-1-N

    Range:- -50°C to + 250°C

    Installation:- 1/2" BSP Male Thread as standard

    Mounting:- Insertion Only

    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:- 75mm as standard

    Insertion Length:- Standard 150mm 

  • Ordering Information

    Model NumberHead MaterialInsertion LengthMounting Type
    TPA-1-N-XX-CF025 Nylon (ABS) XX = length in mm 1/4" BSP Male
    TPA-1-N-XX-CF050 Nylon (ABS) XX = length in mm 1/2" BSP Male
    TPA-1-N-XX-CF075 Nylon (ABS) XX = length in mm 3/4" BSP Male
    TPA-1-A-XX-CF025 Aluminium XX = length in mm 1/4" BSP Male
    TPA-1-A-XX-CF050 Aluminium XX = length in mm 1/2" BSP Male
    TPA-1-A-XX-CF075 Aluminium XX = length in mm 3/4" BSP Male

    For temperature sensors without a process connection please see model TPA-2-A with an Aluminium Head or TPA-2-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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