- Out-of-Stock
DPT146 catalogue
Dewpoint and Pressure Transmitter DPT146
656.74KB
Vaisala DPT146 Dew Point and Pressure Transmitter – Discontinued
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
Product status: The Vaisala DPT146 has been discontinued and is not recommended for new projects. There is no universal one-for-one replacement because the DPT146 measures both dew point and pressure. The correct migration path depends on whether pressure measurement must be retained.
Vaisala DPT146 for Compressed-Air Monitoring
The Vaisala DPT146 was designed for monitoring compressed air where dew point changes with process pressure. By measuring both parameters at the same location, it can provide pressure-compensated humidity information without relying on a manually entered pressure value.
Typical applications include desiccant dryers, compressed-air networks, plastics drying, additive manufacturing and other industrial systems where low moisture levels must be monitored reliably.
Measured and Calculated Parameters
| Parameter | Type | Range |
|---|---|---|
| Dew point | Measured | −70 to +30 °C Td |
| Absolute pressure | Measured | 1 to 12 bar |
| Temperature | Measured through RS-485 | −40 to +80 °C |
| Moisture concentration | Calculated | 1 to 40,000 ppm |
| Atmospheric-pressure dew point | Calculated | −75 to +30 °C |
Key Specifications
| Specification | DPT146 |
|---|---|
| Dew-point accuracy | Up to ±2 °C Td |
| Pressure accuracy | ±0.4% of full scale at +23 °C |
| Temperature accuracy | ±0.5 °C from 0 to +40 °C; ±1 °C across −40 to +80 °C |
| Analog outputs | Two configurable channels: 0–20 mA, 4–20 mA, 0–5 V or 0–10 V |
| Digital communication | RS-485 with Vaisala protocol or Modbus RTU |
| Process connections | ISO G1/2, NPT 1/2 or UNF 3/4-16 |
| Wetted construction | AISI 316L stainless steel |
| Recommended calibration interval | Two years |
Replacement Planning for DPT146
The former DPT146 product page now points to the DMT143 family, but the DMT143 does not include process-pressure measurement. It may suit a compact dew-point-only application, but it is not a direct functional replacement.
| Selection | DPT146 legacy installation | DMT143 or DMT143L | DMP8 |
|---|---|---|---|
| Primary measurement | Dew point and absolute pressure | Compact dew-point measurement | Dew point and temperature |
| Pressure measurement | Integrated | Not included | Not included |
| Typical fit | Existing combined measurement point | Compact OEM equipment and small dryers | Pressurised pipelines and industrial compressed air |
| Installation | Direct process or sampling-cell installation | Compact direct or sampling installation | Adjustable insertion; optional ball-valve installation |
| Integration | Analog outputs and Modbus RTU | Analog output and RS-485 | Standalone Modbus RTU or Vaisala Indigo transmitter |
Explore the Vaisala DMP8 dew-point probe
If pressure is still required: plan for a suitable dew-point instrument together with a separate pressure transmitter, then confirm how both signals and any pressure compensation will be handled by the control or monitoring system.
Before Replacing an Existing DPT146
Record the full DPT146 order code, process connection, operating pressure, dew-point range, output scaling, Modbus settings, supply voltage, sampling arrangement and receiving-system configuration. These details are needed to determine whether the application can use a dew-point-only instrument or requires a two-instrument solution.
For an operating unit, retain the existing manuals, wiring records and calibration history. Remaining stock, calibration and service options should be checked for the individual serial number and installation.
Vaisala DPT146 Support and Replacement Assessment in Malaysia
Seacom Process Instruments supports existing Vaisala DPT146 installations in Malaysia and can assist with product-status checks, calibration planning, process-connection review, output matching and migration to a current dew-point measurement solution.
Contact Seacom with your compressed-air pressure, dew-point range, dryer type, process connection, required outputs and whether independent pressure measurement is needed. Our team can help assess a DMT143, DMP8 or separate dew-point-and-pressure arrangement for the application.
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 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 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 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 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 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 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 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 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 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
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 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 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 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 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