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Smart Dew Point Probe DMP6
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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
Vaisala DMP8 Dew Point and Temperature Probe
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.
- Vaisala Indigo510 and Indigo520 transmitters for robust industrial installations and expanded connectivity
- Vaisala Indigo300 transmitter for a rugged single-probe installation with local display
- Vaisala Indigo200 transmitters for compact single-probe measurement systems
Portable Use with Indigo80
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.
| Model | Best suited to | Dew point range | Temperature or pressure limit | Installation |
|---|---|---|---|---|
| DMP1 | Dry rooms, battery production and semiconductor manufacturing | −70 to +80 °C Td/f | Probe operating temperature −40 to +80 °C | Compact fixed probe for distributed room monitoring |
| DMP5 | Hot industrial dryers, ovens and process ducts | −40 to +100 °C Td/f | Process temperature up to +180 °C | Long direct-insertion probe with adjustable mounting depth |
| DMP6 | Very-high-temperature dryers, ovens and industrial processes | −25 to +100 °C Td/f | Direct process measurement from +100 to +350 °C | Direct-insertion probe with a dedicated passive cooling set |
| DMP7 | Tight spaces, compact equipment, dry gas and compressed air | −70 to +80 °C Td/f | Process pressure up to 10 bar | Short 41 mm sensing head with pressure-tight fitting |
| DMP8 | 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.
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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
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
- Rugged IP66 and NEMA 4 metal enclosure
15 other products in the same category:
The Vaisala DRYCAP® Dew Point and Temperature Probe DMP7 is designed for accurate low-humidity measurement where installation space is limited.
- Short 41 mm probe for remote installation in tight spaces
- Dew point measurement range from −70 to +80 °C Td/f
- Pressure-tight installation for processes from 0 to 10 bar
- Use with Modbus RTU, an Indigo transmitter or the portable Indigo80 handheld indicator
- Suitable for dry rooms, compressed air, industrial drying and semiconductor equipment
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
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.
The Vaisala DMT152 provides accurate dew-point measurement down to −80 °C Td/f for ultra-dry industrial and OEM applications. This model is discontinued and has been replaced by the Vaisala DMT153.
- Calibrated dew-point range from −80 to −20 °C Td/f
- Accuracy up to ±2 °C Td/f
- Operating pressure up to 50 bar
- Analog outputs and RS-485 communication
- DRYCAP® sensor resistant to condensation and contamination
- Use DMT153 for new projects
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
- Rugged IP66 and NEMA 4 metal enclosure
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 DPT146 combines dew-point and process-pressure measurement in one compact transmitter for compressed-air systems. This model is discontinued and should not be selected for new projects.
- Dew-point measurement from −70 to +30 °C Td
- Absolute-pressure measurement from 1 to 12 bar
- Pressure-compensated dew point and ppm calculation
- Analog outputs and RS-485 with Modbus RTU
- Contact Seacom for existing-unit support and replacement assessment
The Vaisala DMT143 and DMT143L provide compact, dependable dew-point measurement for small industrial dryers, compressed-air systems, glove boxes and OEM equipment.
- Dew-point measurement range across the family from −70 to +60 °C Td/f
- Accuracy up to ±2 °C Td/f
- Vaisala DRYCAP® technology with automatic calibration
- Resistant to condensation, compressor oil and particulate contamination
- Analog output and RS-485 with Modbus RTU options
- Compatible with the Vaisala Indigo80 handheld indicator
The Vaisala DMT153 provides traceable low-dew-point measurement for ultra-dry industrial processes. It is the current replacement for the DMT152, with modern analog, Modbus and Vaisala Indigo connectivity.
- Calibrated dew-point range from −80 to −20 °C Td/f
- Dew-point accuracy up to ±2 °C Td/f
- Operating pressure from vacuum to 50 bar absolute
- Analog outputs or RS-485 with Modbus RTU
- Compatible with Vaisala Indigo transmitters and Indigo80
- DRYCAP® sensor with automatic calibration and sensor purge
The Vaisala DRYCAP® Dew Point Probe DMP6 measures humidity directly inside very hot industrial processes using a robust probe and passive cooling set.
- Direct in-line measurement at process temperatures from +100 to +350 °C
- Dew point measurement range from −25 to +100 °C Td/f
- Passive cooling requires no power, cooling water or moving components
- Built-in Modbus RTU or integration with Vaisala Indigo transmitters
- Connect to Indigo80 for portable display, diagnostics, configuration and field calibration
The Vaisala DMT340 Series provided configurable dew-point and temperature measurement for industrial low-humidity applications. The series is discontinued and replaced by Vaisala Indigo500 transmitters with DMP7 or DMP8 smart probes.
- Former models: DMT341, DMT342, DMT344, DMT347 and DMT348
- Designed for dry rooms, industrial dryers, compressed air and process gases
- Legacy display, data logging, analog, relay and communication options
- Use DMP7 for compact, wall-mounted or tight-space applications
- Use DMP8 for pressurised processes and pipelines
- Pair the selected probe with an Indigo500 transmitter
The Vaisala DPT145 provides online dew-point, pressure and temperature measurement for SF6-insulated electrical equipment. The model is being discontinued and should not be specified for new projects.
- Measures dew point, pressure and temperature
- Calculates SF6 density, normalised pressure and moisture in ppm
- RS-485 communication with Modbus RTU
- Contact Seacom for availability and replacement assessment
The Vaisala DMT345 and DMT346 provided direct dew-point measurement in hot industrial drying processes. Both models are discontinued and replaced by Vaisala DMP5 or DMP6 smart probes with an Indigo transmitter.
- DMT345: former solution for processes up to +180 °C
- DMT346: former solution for very hot processes up to +350 °C
- DMT345 replacement: DMP5 with a suitable Indigo transmitter
- DMT346 replacement: DMP6 with a suitable Indigo transmitter
- Direct in-process measurement without a conventional sampling system
- Contact Seacom for mechanical and electrical migration review
The Vaisala DMT132 is a compact and economical dew-point transmitter designed to verify refrigerant-dryer performance by measuring the actual outlet-air dew point.
- Dew-point measurement range from −30 to +50 °C Td/f
- Accuracy up to ±1 °C in the typical refrigerant-dryer range
- Two-wire, loop-powered 4–20 mA output
- Operating pressure up to 20 bar
- Resistant to condensation and compressor oil
- Optional warning LED and loop-powered display