Vaisala DMP8 Dew Point Probe for Pressurised Pipelines
The Vaisala DRYCAP® Dew Point and Temperature Probe DMP8 provides reliable low-humidity measurement in pressurised pipelines with adjustable installation depth.
Dew point measurement range from −70 to +80 °C Td/f
Designed for pressurised processes from 0 to 40 bar absolute
Adjustable insertion depth with ISO R 1/2 or NPT 1/2 process connection
Optional ball-valve kit permits insertion and removal without shutting down the process
Use with Modbus RTU, an Indigo transmitter or the portable Indigo80 handheld indicator
The Vaisala DMP8 is designed for continuous low-humidity measurement in pressurised pipelines. Its sliding compression fitting allows the insertion depth to be adjusted so the sensing head can be positioned correctly in the process.
With the optional ball-valve installation kit, the probe can be inserted into or removed from a pressurised line without stopping the process. This makes the DMP8 a practical choice for compressed air, industrial gases, drying systems and other applications where measurement availability and service access are important.
DMP8 at a Glance
Measured parameters
Dew point or frost point, temperature and calculated humidity parameters
Dew point range
−70 to +80 °C Td/f
Continuous-use dew point range
−70 to +45 °C Td/f
Dew point accuracy
Up to ±2 °C Td/f at pressures up to 20 bar
High-pressure effect
Additional +1 °C Td/f uncertainty from 20 to 40 bar
Process pressure
0 to 40 bar absolute
Temperature range
0 to +80 °C
Process connection
ISO R 1/2 or NPT 1/2
Digital output
Modbus RTU over RS-485
Sensor
Vaisala DRYCAP® 180M
Why Choose the DMP8?
Built for pressurised pipelines: continuous measurement at process pressures up to 40 bar absolute.
Adjustable installation depth: position the sensing head correctly inside different pipe sizes and process connections.
Service without process shutdown: the optional BALLVALVE-1 kit allows insertion and removal from a pressurised line.
Stable at low dew points: DRYCAP technology provides fast response and reliable long-term performance in dry conditions.
Resistant to industrial contamination: sensor purge improves chemical resistance, while the sensor tolerates condensation, oil, dust and most chemicals.
Flexible system connection: operate directly through Modbus RTU or connect to a Vaisala Indigo transmitter or Indigo80 handheld indicator.
Measurement and Operating Specifications
Property
Specification
Dew point measurement range
−70 to +80 °C Td/f
Dry-to-wet response, 63% [90%]
5 seconds [15 seconds]
Wet-to-dry response, 63% [90%]
45 seconds [8 minutes]
Temperature accuracy
±0.2 °C at room temperature
Probe-head operating temperature
−40 to +80 °C
Probe-body operating temperature
−40 to +80 °C
Probe-body protection
IP66
Operating voltage
15–30 V DC
Probe material
AISI 316L stainless steel
Standard probe cable
2 m
Fixed or Portable Measurement
Permanent Process Installation
The DMP8 can connect directly to an automation or monitoring system using Modbus RTU. Where a permanent display, analogue output, relay or Ethernet connection is needed, pair it with a compatible Vaisala Indigo transmitter.
Connect the DMP8 to the Vaisala Indigo80 handheld indicator for portable measurement display, data logging, diagnostics, probe configuration and field calibration. A weatherproof carrying case is available for Indigo80 and a DMP8 with a suitable probe cable.
Product distinction: DMP8 is primarily an installed, adjustable-depth probe for pipelines up to 40 bar, but it can also be connected to Indigo80 for portable display and servicing. DMP80 is a separate handheld probe optimised specifically for portable spot checks and field calibration.
The DMP8 also works with Vaisala Insight PC software for configuration, diagnostics, measurement-data viewing and field calibration.
Typical Applications
Desiccant and compressed-air dryer monitoring
Pressurised dry-air and industrial-gas pipelines
Semiconductor and electronics manufacturing
Industrial drying systems
Metal heat-treatment blanket gases
Vacuum and low-humidity process systems
Installation and Ordering Considerations
Before ordering, confirm the minimum and maximum dew point, process temperature, absolute pressure, pipe size, process connection and required insertion depth. Select either the ISO R 1/2 or NPT 1/2 fitting and determine whether the BALLVALVE-1 kit is required for removal under pressure.
The measurement point should have representative gas flow and should avoid dead legs, leaks and locations where ambient moisture can enter. When direct insertion is unsuitable, an appropriate sampling cell and controlled sample flow may be used.
Pressure note: check the pressure rating of every fitting, valve and sampling accessory—not only the DMP8 probe—before installation.
Vaisala DMP Series Comparison
Choose the DMP probe according to the installation environment, process temperature, pressure and required dew point range.
Pressurised compressed-air and industrial-gas pipelines
−70 to +80 °C Td/f
Process pressure up to 40 bar absolute
Adjustable insertion depth with optional ball-valve installation
Quick selection: choose DMP1 for distributed dry-room monitoring, DMP5 for processes up to +180 °C, DMP6 for very hot processes up to +350 °C, DMP7 when installation space is limited, and DMP8 for pressurised pipelines up to 40 bar.
All five probes support Modbus RTU, compatible Vaisala Indigo transmitters, the Indigo80 handheld indicator and Vaisala Insight software. The final selection should also consider process gas, flow velocity, mounting access, required outputs and calibration arrangements.
DMP8 Videos
Technical Resources
Vaisala DMP8 Supplier and Technical Support in Malaysia
Seacom Process Instruments supplies and supports the Vaisala DMP8 Dew Point and Temperature Probe in Malaysia for compressed air, industrial gases, semiconductor manufacturing, drying systems and other pressurised low-humidity applications.
Our team can assist with probe selection, ISO or NPT process fittings, ball-valve installations, sampling arrangements, Indigo transmitter pairing, portable Indigo80 use, system integration, commissioning and calibration planning.
Contact Seacom with your dew-point range, process temperature and pressure, pipe size, process connection, required insertion depth and electrical output so we can recommend a suitable DMP8 configuration.
Vaisala Indigo510 and Indigo520 Flagship Transmitters
The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.
Indigo510: one probe and two isolated analog outputs
Indigo520: two probes, four isolated outputs and two relays
Ethernet web interface and Modbus TCP communication
The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.
Indigo201 with three analog outputs and two relays
Indigo202 with Modbus RTU and two relays
Colour display with numerical and graphical views
IP65 enclosure for industrial measurement applications
Vaisala Miniature size dew point transmitters DMT143 and DMT143L are ideal choices when you want to measure dew point accurately in small compressed air dryers, plastic dryers, additive manufacturing and other OEM applications. They are easy to integrate and can be used in Vaisala DM70 hand-held. The long version has replaced the DMT242.
The Vaisala DMP1 Dew Point and Temperature Probe provides fast, dependable low-humidity measurement for dry rooms and moisture-sensitive manufacturing areas.
Dew point measurement range from −70 to +80 °C Td/f
Fast response for detecting changes across large dry rooms
Modbus RTU communication or integration with Vaisala Indigo transmitters
Connect to Indigo80 for portable display, data logging, diagnostics and field calibration
Suitable for battery production, semiconductor manufacturing and controlled dry environments
The Vaisala Indigo300 is a rugged industrial transmitter for one Vaisala Indigo-compatible smart probe, providing local measurement display and up to three configurable analog outputs.
Its corrosion-resistant IP66 metal enclosure, flexible probe mounting and interchangeable probe design make Indigo300 suitable for humidity, temperature, dew point, CO2, moisture in oil and other demanding industrial measurements.
Vaisala Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the functionality of refrigerant dryers. The probe has excellent long-term stability and it is resistant to compressor oil. It is especially well suited for OEM dryer manufacturers.
Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the functionality of refrigerant dryers. The probe has excellent long-term stability and it is resistant to compressor oil. It is especially well suited for OEM dryer manufacturers.
The Vaisala Dewpoint, Pressure and Temperature Multiparameter Transmitter DPT145 for SF6 Gas is a unique innovation that enables online measurement of dew point, pressure, and temperature. It also calculates four other values, including SF6 density. The DPT145 is especially well suited for integration into OEM systems.
- First transmitter to offer online measurement of seven SF6 parameters in one unit - Measured parameters: dew point, pressure, temperature - Calculated parameters: SF6 density, normalized pressure, dew point in atmospheric pressure, ppm - Saves time and money across the board, from investment and installation to operation and servicing - More reliable assessment of the condition of SF6 insulation due to online measurement - Long calibration interval of years
The Vaisala DRYCAP® Dew Point and Temperature Probe DMP5 measures humidity directly in hot industrial processes with a long stainless-steel probe and adjustable installation depth.
Direct in-line measurement at process temperatures up to +180 °C
Dew point measurement range from −40 to +100 °C Td/f
Long probe reaches through insulation and thick process walls
Built-in Modbus RTU or integration with Vaisala Indigo transmitters
Connect to Indigo80 for portable display, diagnostics, configuration and field calibration
The Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are designed for humidity measurement in industrial drying applications with particularly high temperatures. The high temperature tolerance of the sensor allows direct measurement from hot process without the need for a sampling system and sample conditioning. The wide dynamic rage of the measurement in DMT345 and DMT346 is unique: Measurements can be made from -40 °C frost point up to +100 °C dew point, with dry-bulb temperatures ranging up to 350 °C.
The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is designed for measuring low dew point in OEM applications, even down to -80°C. The excellent long-term stability and reliability of its performance is based on the latest DRYCAP® polymer sensor technology. The DMT152 is an ideal choice for industrial applications where it is necessary to control very low humidity.
DMT152 is an ideal choice for the semiconductor industry, air and plastics dryers, glove boxes, dry chambers, pure gases, additive manufacturing, high voltage circuit breakers and other applications where it is critical to control humidity with high accuracy. DMT152 measures accurately and reliably also in the challenging combination of low humidity and hot air, which is typical in plastics drying.
Vaisala Indigo510 and Indigo520 Flagship Transmitters
The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.
Indigo510: one probe and two isolated analog outputs
Indigo520: two probes, four isolated outputs and two relays
Ethernet web interface and Modbus TCP communication
Condensation-resistant Vaisala Dewpoint Transmitter DMT340 is designed for industrial low-humidity applications such as industrial drying, compressed air systems, semiconductor industry, dry rooms, baking ovens, and metal heat treatment to provide accurate and reliable measurement.
The Vaisala DRYCAP® Dew Point and Temperature Probe DMP8 provides reliable low-humidity measurement in pressurised pipelines with adjustable installation depth.
Dew point measurement range from −70 to +80 °C Td/f
Designed for pressurised processes from 0 to 40 bar absolute
Adjustable insertion depth with ISO R 1/2 or NPT 1/2 process connection
Optional ball-valve kit permits insertion and removal without shutting down the process
Use with Modbus RTU, an Indigo transmitter or the portable Indigo80 handheld indicator
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