CST-CPT Temperature sensor

Temperature measurement

The CST-CPT is a Pt100 resistance temperature sensor with an integral 4-20mA transmitter and a standard DIN Hirschmann connector, designed for accurate, reliable temperature measurement in industrial environments. The Class A Pt100 sensing element is housed in a rigid 6mm diameter, 316 stainless steel sheath, available in standard immersion lengths of 50, 100, or 150mm, fitted below the hex of a ½" BSP process connection. The integral 4-20mA transmitter is housed in a 316 stainless steel body. It is loop-powered (10 to 30 Volts DC) and outputs a linear 4-20mA signal over a default range of 0–100°C, with an ambient operating temperature range of 0 to 75°C. A DIN-style Hirschmann connector allows for quick, tool-free installation and replacement while maintaining a reliable connection. The removable connector socket is rated IP65 and includes a central fixing screw and a PG7 cable gland suitable for instrument cable diameters of 4.5–6mm.

Features

  • Pt100 Class A accuracy
  • Built-in 4-20mA transmitter
  • Standard DIN (Hirschmann) connector
  • 316 stainless steel construction
  • 0–100°C standard measuring range

Applications

  • Industrial process control
  • HVAC systems
  • OEM equipment integration

Specification

Parameter Value
Product Pt100 sensor with 4-20mA transmitter
Sensor Type 2-wire, 3-wire, Class A Pt100
Temperature Range 0 to 100 °C, -50 to 450°C (option)
Output 3-wire, 2 wire 4–20 mA
Power Supply 10 to 30 Volts DC (4–20 mA loop-powered)
Ambient Operating Temperature 0 to 75 °C
Probe Length 50, 100 (option)
Probe Diameter 6mm (option)
Process Connection ½” BSP, stainless steel
Material 316 stainless steel
Accuracy 0.2°C ± 0.05% of reading
Connector DIN Hirschmann, IP65, PG7 gland (4.5–6mm cable)
Part Number CST-CPT

Technical Drawing

  • Overall connector-to-hex length: 70mm
  • Connector body diameter: Ø26.7mm
  • Process thread: ½” BSP (¾” NB SCH.40 reference)
  • Probe diameter: Ø6mm
  • Immersion length: per ordered probe length (50 / 100 / 150mm)

Wiring (4-20mA, 2-wire): Terminal 1 = +, Terminal 2 = − Wiring (3-wire RTD): Terminal 1 = A, Terminal 2 = B, Terminal 3 = b

Compliance with European (EU) Standards

The CST-CPT’s Pt100 sensing element is manufactured to Class A tolerance, consistent with the DIN/IEC EN 60751 standard — the internationally recognised European reference for platinum resistance thermometers. This standard defines the resistance-versus-temperature relationship (100.00 Ω at 0°C, α = 0.00385 Ω/Ω/°C) and the permitted tolerance bands (Class A: ±(0.15 + 0.002×|t|)°C), ensuring interchangeability with other EN 60751-compliant Pt100 sensors and transmitters used throughout the EU market.

The stainless steel construction, IP65-rated connector, and terminal-based wiring also align with common European industrial protection and installation practices (EN 60529 ingress protection ratings, DIN 43650-style connector conventions).

Equivalent Products from Other Manufacturers

For reference, the table below compares the CST-CPT against broadly equivalent Pt100 + 4-20mA transmitter products from other well-known manufacturers serving the EU market:

Manufacturer / Model Sensor Class Range Output Accuracy Connection IP Rating
CST-Instruments CST-CPT Pt100 Class A, 3-wire 0 to 100°C (default)

You Might Also Like

Scroll to Top