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Vaisala has introduced their DMT143 Miniature Dewpoint Transmitter for OEM Applications. Using their DRYCAP technology, Vaisala’s DMT143 is able to be directly installed into pressurized systems at 50 bar (725 PSIA) maximum pressure. The sensor fully tolerates moisture, making it ideal for applications that experience process water spikes, like pipeline condensation during system failures or start-ups. More still, the DMT143 is resistant to particulate contamination, oil vapor and most chemicals, in addition to being insensitive to the flow rate.
| Measured Parameters | |
| DEW POINT TEMPERATURE | |
| Measurement range(typical) | -70 ... +60 °C (-94 ... +140 °F) Td |
| Analog output scalings | |
| option 1 | -80 ...+20 °C (-112 ... +68 °F) Td |
| option 2 | -80 ...+20 °C (-112 ... +68 °F) Td dew point at ambient pressure |
| option 3 | free scaling |
| Accuracy in air or N2 | ±2 °C (±3.6 °F) Td |
| when the dew point is below 0 °C (32 °F), the transmitter outputs frostpoint | |
| Response time 63% [90%] at +20 °C gas temperature and 1 bar | |
| pressure | |
| -60 -> -20 °C Td (-76 -> -4 °F Td) -20 -> -60 °C Td (-4 -> -76 °F Td) | 5 s [15 s] 45 s [10 min] |
| PPM VOLUME CONCENTRATION | |
| Measurement range (typical) Accuracy at +20 °C (+68 °F), 1 bar | 10 ... 40000 ppm 1 ppm + 20% of reading |
| Operating Environment | |
| Measured gases | non-corrosive gases |
| Temperature *) | -40 ... +60 °C (-40 ... +140 °F) |
| Relative humidity | 0 ... 100 %RH |
| Pressure *) | 0 ... 50 bara (725 psia) |
| Sample flow rate | no effect for measurement accuracy |
| *) For extended temperature below 0 °C (+32 °F) or pressure above 20 bara (290 psia) the supply voltage must be 24 ... 28 VDC. | |
| Outputs | |
| Analog output (scalable) Resolution for current output Resolution for voltage output Typical temperature dependence Digital output Connector | 4 ... 20 mA (3-wire), 0 ... 1 V/5 V, 1 ... 5 V 0.002 mA 0.3 mV 0.005 % of span / °C RS-485, non-isolated Vaisala Industrial Protocol 4-pin M8 (IEC 60947-5-2) |
| General | |
| Sensor Recommended calibration interval to confirm the specified accuracy Operating voltage with voltage output Operating voltage with current output | Vaisala DRYCAP® 180D 2 years 12 ... 28 VDC 18 ... 28 VDC |
| Supply current normal measurement during self-diagnostics Load for current output Load for voltage output Housing material Sensor protection Mechanical connection Housing classification Storage temperature range Weight | max 10mA + load current max. 220 mA pulsed max. 500 Ohm min. 10 kOhm stainless steel (AISI316L) stainless steel sintered filter ISO G1/2” or NPT 1/2 IP66 (NEMA 4) -40 ... +60 °C (-40...+140 °F) G-thread version 90g (3.2oz) NPT-thread version 100g (3.5oz) |
| Complies with EMC standard EN61326-1, Electrical equipment for measurement, control and laboratory use - EMC requirements - Industrial environment. | |
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