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DMT143 catalogue
Miniature Dew Point Transmitters DMT143
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Vaisala DMT132 Dew Point Transmitter for Refrigerant Dryers
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
Measure the Dryer Outlet Dew Point Directly
The Vaisala HUMICAP® DMT132 is designed specifically for refrigerant dryers and related OEM compressed-air equipment. Instead of estimating dryer performance from the refrigeration temperature, it measures the actual dew point of the outlet air.
This gives operators and equipment manufacturers a clearer indication of delivered-air quality. The measurement can reveal changing dryer performance, support alarm functions and help avoid unnecessary dryer capacity or maintenance.
Why Dew Point Is Better Than Refrigeration Temperature
The internal refrigeration temperature does not always represent the moisture condition of the compressed air leaving the dryer. Direct outlet dew-point measurement shows whether the dryer is achieving the required air quality under the actual load and operating conditions.
| Monitoring method | What it indicates | Practical limitation |
|---|---|---|
| Refrigeration temperature | Cooling-system operating condition | Indirect indication that may not equal the delivered compressed-air dew point |
| DMT132 outlet dew point | Actual moisture condition of the compressed air | Requires a representative installation point and correct pressure setting |
Key DMT132 Specifications
| Specification | DMT132 performance |
|---|---|
| Measured parameter | Dew point or frost point temperature |
| Calculated parameter | Dew point or frost point converted to atmospheric pressure |
| Measurement range | −30 to +50 °C Td/f |
| Typical refrigerant-dryer accuracy | ±1 °C from −3 to +20 °C Td/f |
| Operating temperature | −30 to +50 °C |
| Operating pressure | 0 to 20 bar |
| Measurement gases | Non-corrosive gases |
| Analog output | Scalable two-wire 4–20 mA |
| Supply voltage | 10 to 28 VDC |
| Process connection | ISO G1/2 |
| Electrical connection | Four-pin M8 connector |
| Protection rating | IP65 / NEMA 4 |
| Recommended calibration interval | Two years in normal refrigerant-dryer applications |
Simple OEM and Control-System Integration
The loop-powered 4–20 mA output allows the DMT132 to connect directly to a dryer controller, PLC, indicator or monitoring system. Its low supply requirement and compact housing suit both new OEM equipment and upgrades where panel space and wiring are limited.
- Optional LED indication for a configured dew-point limit or device error
- Optional loop-powered local display
- RS-485 service connection for setup, calibration and diagnostics
- Fast start-up for equipment integration
Communication note: the DMT132 provides its continuous process signal through the two-wire 4–20 mA output. Its RS-485 connection is intended for service functions and should not be presented as a standalone Modbus process output.
Pressure Compensation
The DMT132 does not measure pressure. The system pressure is entered as a compensation value during configuration. An approximate pressure value is normally sufficient for standard process dew point, but an accurate absolute-pressure setting is important when the transmitter is configured to output dew point converted to atmospheric pressure.
Confirm the normal measurement pressure when ordering. If the dryer operates over a wide or changing pressure range, review whether a fixed compensation value is suitable for the required result.
Direct Installation or Sampling Cell
| Installation method | Advantages | Check before installation |
|---|---|---|
| Direct installation | Fast response, simple arrangement and measurement at line pressure | Safe isolation, G1/2 connection, available space and representative gas flow |
| Sampling cell | Easier isolation, controlled sample flow and convenient removal for calibration | Tubing material, leaks, sample pressure, exhaust arrangement and response time |
For sampled measurements, use clean tubing with low moisture permeability and keep the line short. Leaks, wet tubing, dead volumes and ambient-air ingress can cause a slow or incorrect dew-point reading.
Compare DMT143, DMT132 and DMT153
| Selection point | DMT143 / DMT143L | DMT132 | DMT153 |
|---|---|---|---|
| Current status | Current | Current | Current; successor to DMT152 |
| Best application | Small dryers, glove boxes, compressed air and general OEM integration | Refrigerant dryers and economical dryer-performance monitoring | Very-low-dew-point OEM and industrial applications |
| Calibrated dew-point range | Configuration-dependent; family coverage extends from −70 to +60 °C Td/f | −30 to +50 °C Td/f | −80 to −20 °C Td/f |
| Typical accuracy | Up to ±2 °C Td/f | Up to ±1 °C in the refrigerant-dryer range | ±2 °C from −80 to −40 °C Td/f; ±3 °C from −40 to −20 °C Td/f |
| Sensor technology | DRYCAP® | HUMICAP® | DRYCAP® |
| Pressure capability | Up to 20 bar standard; selected DMT143 configurations up to 50 bar | Up to 20 bar | Up to 50 bar absolute |
| Primary output options | Analog output and RS-485 Modbus RTU | Two-wire 4–20 mA; service RS-485 | Analog output or RS-485 with Modbus RTU |
| Portable and transmitter compatibility | Indigo80 handheld indicator | HM70 or DM70 handheld for spot-checking | Indigo transmitters and Indigo80 handheld indicator |
| Best choice when | You need a small, versatile transmitter for dry industrial gas | You need cost-effective verification of a refrigerant dryer | You need traceable measurement down to −80 °C Td/f with modern connectivity |
Choose by operating range: DMT132 is intended mainly for refrigerant dryers, DMT143/DMT143L provide compact and flexible OEM dew-point measurement, and DMT153 is the current choice for demanding ultra-dry applications down to −80 °C Td/f.
Calibration and Field Checking
The DMT132 is factory calibrated. Vaisala recommends a two-year calibration interval in normal refrigerant-dryer service, or one year when the transmitter is regularly used near the dry end of its range. The appropriate interval should also reflect the site quality system and the importance of the measurement.
A calibrated Vaisala DM70 reference instrument can be used for a field comparison at a stable dew point. Confirm that both instruments are measuring the same gas condition and that the pressure-compensation settings are correct before assessing the difference.
Vaisala DMT132 Supplier in Malaysia
Seacom Process Instruments supplies and supports the Vaisala DMT132 Dew Point Transmitter in Malaysia for refrigerant dryers, compressed-air equipment and OEM dryer manufacturing.
Our team can assist with the measuring range, 4–20 mA scaling, pressure-compensation setting, process connection, sampling cell, warning indication, installation arrangement and calibration planning.
Contact Seacom with the dryer type, expected outlet dew point, operating pressure and temperature, installation point, power supply, control-system input and alarm requirement so we can check whether the DMT132 is the right selection.
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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
15 other products in the same category:
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 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 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 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 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 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 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 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 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 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