DPT-21_22 Programmable 2- wire dewpoint transmitter (-100..+20Cdp)

DPT-21 / DPT-22 – Programmable Gas Humidity Transmitters

DPT-21 and DPT-22 are modern, microprocessor-based transmitters designed for precise gas humidity measurement, expressed as dew point temperature, relative humidity, water vapor content (ppm), or degrees Fahrenheit. The devices convert the signal from a ceramic capacitive sensor into a standard 4–20 mA current signal.

The transmitters are available with two types of process connections:

• DPT-21 with external thread 5/8″-18 UNF
• DPT-22 with thread G1/2″

The transmitters come factory-calibrated and ready to use. However, key parameters – such as physical unit, measurement range, output signal type, and fault indication mode – can be adjusted by the user using the dedicated DPT-IF2013U USB interface.

Key Features:

• Dew point temperature measurement range: –100 to +20 °Cdp
• Configurable measurement span
• Available units: °Cdp, °Fdp, ppm (v), %RH
• Fast humidity response time (T95 ~1 min)
• Robust stainless steel housing (IP65 protection)
• Maximum working pressure: up to 40 MPa
• Loop-powered: 8–36 V DC
• Compatible with SCADA / PLC systems

Applications

With dew point measurement down to –100 °Cdp, the DPT-21 / DPT-22 transmitters are ideal for demanding environments where ultra-dry gas conditions are critical:

• Semiconductor industry – humidity control during microprocessor production
• Pharmaceutical industry – dry storage and transport of pharmaceuticals
• Aerospace – protection of systems against freezing and corrosion
• Energy and gas industry – monitoring gas quality and preventing condensation
• Technical gas production – controlling purity and humidity during cylinder filling

DPT-21 and DPT-22 are an excellent choice for industrial applications where reliable and accurate gas humidity measurement is essential.