Vaisala DM70 Portable Dew Point Meter – Discontinued

Vaisala DM70 Portable Dew Point Meter

The Vaisala DM70 was a portable meter for dew-point spot checks, process measurements and data logging. It is discontinued and replaced for general dew-point work by the Vaisala Indigo80 handheld indicator with a DMP80A or DMP80B probe.

  • Legacy DMP74A, DMP74B and SF₆-specific DMP74C probe options
  • Direct or sampled measurement in pressurised processes
  • Portable numerical and graphical display with data logging
  • Current replacement: Indigo80 with DMP80A or DMP80B
  • DMP80A for moderate dew points down to −40 °C Td/f
  • DMP80B for dry applications down to −70 °C Td/f

Product status: The Vaisala DM70 and its MI70 handheld platform are discontinued. For current portable dew-point measurements, use the Vaisala Indigo80 handheld indicator with a DMP80A or DMP80B probe selected according to the required dew-point range.

Vaisala DM70 for Existing Portable Dew Point Applications

The Vaisala DM70 combined an MI70 handheld indicator with a DMP74 series probe for portable dew-point and temperature measurement. It was used for compressed air, industrial dryers, dry gases, process troubleshooting, field verification of fixed transmitters and moisture measurement in SF₆-insulated electrical equipment.

The probe could be inserted directly into a suitable process connection or connected through a sampling cell. The handheld indicator displayed up to three parameters numerically or graphically and stored readings for later transfer to a computer.

Legacy DM70 Probe Options

Legacy probeMeasurement rangeTypical useOperating pressure
DMP74A −50 to +60 °C Td/f General-purpose dew point, higher humidity and dryer applications 0 to 20 bar absolute
DMP74B −70 to +30 °C Td/f Dry compressed air, dry gases and lower-dew-point applications 0 to 20 bar absolute
DMP74C −70 to +30 °C Td/f Moisture measurement in SF₆ gas 0 to 10 bar absolute

Current Replacement: Indigo80 with DMP80

The current portable platform separates the handheld indicator from the measurement probe. Indigo80 provides the display, data logging, diagnostics and calibration interface, while the selected DMP80 probe performs the dew-point measurement.

ComponentFunctionSelection guidance
Indigo80 Portable display, two-probe connection, data logger, diagnostics and calibration interface Required as the current handheld platform
DMP80A Dew point and temperature measurement from −40 to +60 °C Td/f Choose for moderate dew points, humid applications and many refrigerant-dryer checks
DMP80B Dew point and temperature measurement from −70 to +60 °C Td/f Choose for dry compressed air, desiccant dryers and low-dew-point gases

Explore the Vaisala Indigo80 and DMP80 portable system

DMP80A or DMP80B?

Selection pointDMP80ADMP80B
Sensor DRYCAP® 180S DRYCAP® 180M
Best humidity region Moderate dew points and more humid conditions Dry and very-low-dew-point conditions
Dew-point range −40 to +60 °C Td/f −70 to +60 °C Td/f
Dew-point accuracy Up to ±2 °C Td/f Up to ±2 °C Td/f
Temperature range 0 to +60 °C 0 to +60 °C
Operating pressure 0 to 20 bar absolute 0 to 20 bar absolute
Process threads G1/2 or NPT 1/2 G1/2 or NPT 1/2
Typical application Refrigerant dryers, ambient-to-process checks and moderate dryness Desiccant dryers, dry gases and low-dew-point processes

DM70 to Indigo80 Migration

Migration pointDM70Indigo80 with DMP80
Product status Discontinued Current portable platform
Handheld indicator MI70 Indigo80
General-purpose probe DMP74A DMP80A
Low-dew-point probe DMP74B DMP80B
Probe connections Up to two MI70-compatible instruments, configuration-dependent Up to two compatible probes simultaneously
Display Numerical and graphical readings Modern colour numerical and graphical display
Data logging Legacy onboard logging and MI70 Link transfer Large onboard logging capacity and USB-C data transfer
Configuration and diagnostics MI70 menus and legacy PC tools Indigo80 menus and Vaisala Insight PC software
Current smart-probe support Limited to the legacy MI70 platform Broad support for current Vaisala Indigo-compatible probes and transmitters

Important Guidance for Former SF₆ Applications

The DM70 could be supplied with the DMP74C, a probe specifically developed for moisture measurement in SF₆ gas. The current DMP80 documentation lists air, nitrogen, hydrogen, argon, helium and oxygen as supported measurement gases, but does not explicitly list SF₆.

Do not assume DMP80 is a direct DMP74C replacement for SF₆: confirm the current Vaisala-approved probe, sampling cell, pressure range and gas-recovery arrangement before specifying a replacement. The assessment must also consider applicable safety and environmental requirements for handling SF₆.

For legacy SF₆ measurements, provide the complete DM70 and DMP74C model information, equipment pressure, connector type, expected moisture range and the existing method of recovering or exhausting the sampled gas.

Direct Measurement or Sampling Cell

MethodAdvantagesPoints to check
Direct process measurement Fast setup and measurement at actual process pressure Safe isolation, compatible thread, pressure rating and available probe clearance
Sampling cell Controlled sample flow, convenient isolation and easier connection to different processes Tubing material, leaks, inlet pressure, outlet restriction and representative gas flow
Two-pressure sampling Supports measurement at process or reduced pressure according to the arrangement Correct valve sequence, pressure conversion and safe exhaust or gas recovery

Low-dew-point measurements are sensitive to ambient-air leakage, wet fittings and moisture released from sampling tubing. Use clean compatible tubing, minimise joints and dead volume, and allow the reading to stabilise before recording the result.

Using Indigo80 Beyond Portable Dew Point Measurement

Indigo80 can connect to two compatible measurement devices at the same time. In addition to DMP80 portable probes, it can display and service many current Vaisala fixed probes and transmitters for humidity, temperature, dew point, carbon dioxide, vaporised hydrogen peroxide and moisture in oil.

This makes Indigo80 useful for commissioning, comparing an installed probe with a reference, diagnosing a process, recording temporary trends and performing supported field calibration or adjustment.

Existing DM70 Equipment

Retain the DM70 indicator, DMP74 probe, sampling accessories, order codes, calibration certificates and user documentation while the system remains in service. Check calibration and repair availability before relying on a legacy unit for critical quality or compliance measurements.

A functioning DM70 does not need to be removed solely because it is discontinued. Plan replacement according to calibration status, battery and accessory condition, service availability and the importance of the measurement.

Vaisala DM70 Support and Indigo80 Replacement in Malaysia

Seacom Process Instruments supports existing Vaisala DM70 portable dew point meters in Malaysia and supplies the current Indigo80 and DMP80 platform for compressed air, industrial dryers, dry gases, glove boxes, process troubleshooting and field verification.

Our team can assist with selecting DMP80A or DMP80B, sampling cells, pressure and process connections, Indigo80 configuration, data logging, field-check procedures and calibration planning. Former SF₆ applications will be reviewed separately to confirm a suitable current Vaisala arrangement.

Contact Seacom with your dew-point range, gas type, operating pressure and temperature, process connection, sampling method and calibration requirements so we can recommend an appropriate portable measurement configuration.

Download

  DM70 Catalogue   (233.17k)

  DM70 Order Form   (91.88k)

  Indigo80 Catalogue   (369.55k)

  DMP80 Catalogue   (201.7k)


Specific References

1 other product in the same category:

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Vaisala Portable Humidity Meter With Remote Probe Indigo80

Vaisala Indigo80 Portable Meter with HMP80 DMP80 GMP80P

Vaisala Indigo80 Portable Meter

The Vaisala Indigo80 is a robust handheld indicator and data logger for industrial spot checks, process diagnostics, field calibration and measurement data analysis.

  • Connect and display measurements from up to two compatible probes
  • Measure humidity, temperature, dew point, carbon dioxide and other industrial parameters
  • Use with HMP80, DMP80 and GMP80P portable measurement probes
  • Record up to approximately 5.5 million real-time measurement values
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