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The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is a small-size dewpoint measurement instrument designed for measuring dry air or gas in OEM applications.
The Vaisala DMT152 can measure dewpoint even down to -80 C (-112 F) or 1 ppm of humidity.
The accuracy and reliability of the DMT152 performance is based on the Vaisala DRYCAP® polymer sensor technology. It has a low maintenance need due to the long-term stability and durability against condensation. The DMT152 mechanics have been designed for harsh environments requiring protection against dust, dirt, and splashed water.
Typical areas of application are air and plastics dryers, dry chambers, pure gases, and high-voltage circuit breakers. The DMT152 measures accurately and reliably also in the combination of low humidity and hot air, typical in plastics drying.
| Measured Variables | |
| DEW POINT TEMPERATURE | |
| Measurement range | -80 ... -10 °C (-112 ... +14 °F)Td |
| Accuracy | |
| -80 ... -30 °C (-112 ... -22 °F) -30 ... -10 °C (-22 ... +14 °F) | ±2 °C (3.6 °F) Td ±3 °C (5.4 °F) Td |
| Non-calibrated range | -100 ... -80 °C, -10 ... +20 °C Td (-148 ... -112 °F, +14 ... +68 °F Td) |
| Analog output scalings | |
| option 1 option 2 option 3 | -80 ... +20 °C (-112 ... +68 °F) Td -100 ... 0 °C (-148 ... +32 °F) Td user-specified output scaling |
| when dew point is below 0 °C (32 °F) the transmitter outputs frost point | |
| Accuracy over temperature range | |
| Response time 63 % [90 %] at a gas temperature of +20 °C (+68 °F) and pressure of 1 bar | |
| -10 ... -80 °CTd -80 ... -10 °CTd | 0.5 min [7.5 min] 2 s [5 s] |
| Typical long-term stability | better than 2 °C (3.6 °F) /year |
| PPM VOLUME CONCENTRATION | |
| Measurement range (typical) | 0 ... 500 ppm |
| Accuracy at +20 °C (+68 °F), 1013 mbar | ±(0.2 ppm + 20 % of reading) |
| Operating Environment | |
| Temperature | 40 ... +70 °C (-40 ... +158 °F) |
| Relative humidity | 0 ... 100 %RH (up to + 20 °C/68 °F) |
| Pressure | 0 ... 50 bar (725 psia) |
| Measured gases | non-corrosive gases |
| Sample flow rate | no effect on measurement accuracy |
| Outputs | |
| Two analog outputs (scalable) | 4 ... 20 mA, 0 ... 20 mA (3 wire) 0 ... 5 V, 0 ... 10 V |
| Accuracy of analog outputs | ± 0.01 V / ±0.01 mA |
| Digital output | RS485 (2-wire) |
| Alarm-level indication by analog signal | user selectable |
| Purge information | 5 V, 10 V, 20 mA or LED |
| General | |
| Sensor | Vaisala DRYCAP® 180U Thin-film capacitive polymer sensor |
| Recommended calibration interval | 2 years |
| Operating voltage with | |
| RS485 output voltage output current output | 11* ... 28 VDC 15* ... 28 VDC 21 ... 28 VDC |
| *For extended temp. down to -40 °C (-40 °F) or pressure up to 50 bar (725 psia), the supply voltage is 21 ... 28 VDC. | |
| Supply current | |
| normal measurement during self-diagnostics | 20 mA + load current max. 220 mA pulsed |
| Supply voltage fluctuation | max. 0.3 V |
| External load for | |
| voltage output current output | min. 10 kOhm max. 500 Ohm |
| Housing material (wetted parts) | AISI316L |
| Stainless steel mesh filter | Filter body AISI303, mesh AISI316L, grade 18 μm |
| Mechanical connections | ISO G½”, NPT ½", UNF 3/4”- 16” |
| Housing classification | IP65 (NEMA 4) |
| Storage temperature range | -40 ... +80 °C (-40 ... +176 °F) |
| Weight (ISO G½”) | 190 g (6.70 oz) |
| Complies with EMC standard EN61326-1, Electrical equipment for measurement control and laboratory use - EMC requirements; Industrial environment | |
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- • Compressed Air
- • Plastics Drying
- • Dry Chambers
- • Pure Gases
- • High-Voltage Circuit Breakers
