PRT Terminal Head Temperature Sensor, Class B, 3 Wire, +250°C Max
The process connection thread with terminal head sensor is suitable for the measurement of liquids and gases across a wide temperature range. All sensors are made to order so it is generally possible to meet all of your requirements.
All wetted parts of the PRT probe are made from 316 stainless steel and are TIG welded to give a pressure-tight housing for the sensor. Many metric and imperial probe diameters are available from 3mm upwards. Various thread types are available and they are generally BSP, BSPT or NPT types but we can supply others to your requirements such as Metric, UNF etc.
The PPL4-P platinum resistance thermometer is supplied as a 3-wire Pt100 temperature sensor with Class B tolerance. The probe is 6mm in diameter and the length selectable below a 1/2″BSP male process connection thread. An IP68 KNE aluminium alloy terminal and ceramic terminal or in-head 4-20mA output transmitter are then fitted.
The operating temperature range is -75 to +250°C but we recommend our PPL5-P for higher ambient temperatures to protect the in-head electronics.
The PPL4-P PRT sensor is ideal for direct installation into your process or for use with our PPL51-TW pocket.
Additional Information about PRT Probe
The PPL4 is also available as a thermocouple PPL4-P sensor. We are also able to supply the probe with your choice of thermistor sensor.
We offer a comprehensive PRT probe calibration service and can offer a wide choice of accessories.
Buying in bulk, or need some advice on thermocouples with IP67 alloy terminal heads? Our technical sales team will be happy to recommend the perfect thermocouple for your needs or provide a quote for a custom build.
Terminal Heads from Process Parameters
As manufacturers of PRT probes and temperature sensors, we don’t list the full range of sensors available as we can design and build to any variation and specification you require in a PRT sensor.
We stock a variety of terminal heads that cover all eventualities. The most popular is the aluminium alloy KNE head which is commonly used in the industry. We do however also offer other materials such as ABS, Nylon, FDA approved Polypropylene and of course 316 stainless steel for the most demanding applications. Most of our terminal heads have IP ratings of IP67 or IP68.
We can fit a number of options inside the terminal heads that best fit your requirements. The simplest is a terminal block allowing you to connect directly to the sensor. Alternatively, we can supply temperature transmitters with either a 4-20mA or a 0-10V output. Other options include intrinsically safe transmitters or those with HART protocol. We can also fit in head displays if required.
What is a PRT Probe?
A PRT probe, also known as a platinum resistance thermometer probe, is a type of temperature sensor that utilises the electrical resistance of platinum to measure temperature accurately. The probe consists of a thin platinum wire wound into a coil or placed on a ceramic substrate. Platinum is chosen due to its predictable resistance-temperature relationship, making it a reliable material for temperature measurement.
PRT probes are widely used in various industries and scientific applications where precise temperature monitoring and control are essential, such as laboratory experiments, industrial processes, and calibration standards.
For more information on PRT probes and Pt100 temperature sensors, read our informative guides: