Technical data

DMP74A measurement performance

Dew point

Measurement range (typical)

−50 … +60 °C (−58 … +140 °F)

Dew point accuracy vs. measurement conditions

10

30

30

10

20

40

0

-10

-20

50

60

50

Temperature of measured gas (°C)

-10

0

-30

-40

-50

-60

60

70

-70

-80

40

20

Accuracy

< ±2 °C

Td

Water

vapor

satura

tion lin

e

Accuracy

< ±1 °C

Td

Dew point measurement

range lower

limit

Accuracy

not specified

Accuracy (A probe) −40 … +60 °C

±2 °C (±3.6 °F)

(see graph)

Response time

Flow rate 0.2 m/s, 1 bar pressure,

+20 °C (+68 °F)

63 % [90 %]

0 → −40 °C Td (32 → −40 °F Td)

20 s [120 s]

−40 → 0 °C Td (−40 → 32 °F Td)

10 s [20 s]

Dew point sensor

Vaisala DRYCAPâ 180S

Temperature

Measurement range

−10 … +60 °C (+14 … +140 °F)

Accuracy at +20 °C (+68 °F)

±0.2 °C (±0.36 °F)

Typical temperature dependence

of electronics

±0.005 °C/°C (±0.005 °F/°F)

Temperature sensor

Pt100 RTD Class F0.1 IEC 60751

Other variables available

Dew point converted to atmospheric pressure, ppm volume and ppm weight

concentration, absolute humidity, mixing ratio, relative humidity

Operating environment, all probe models

Operating temperature

−10 … +60 °C (+14 … +140 °F)

Operating pressure for DMP74A,

DMP74B

0 … 20 bara (0 … 290 psia)

Operating pressure for DMP74C

0 … 10 bara (0 … 150 psia)

Sample flow rate

No effect on measurement accuracy

Measured gases

Non-corrosive gases

EMC compliance

EN 61326-1, Basic environment

Mechanical specifications, all probe models

Probe material (wetted parts)

Stainless steel (AISI 316L)

Sensor protection

Sintered filter (AISI 316L)

Mechanical connection

G1/2” ISO228-1 thread

with bonded seal ring (U-seal)

IP rating

IP65 (NEMA 4)

Weight

350 g (12 oz)

DMP74B and DMP74C (for SF6 gas)

measurement performance

Dew point

Measurement range (typical)

−70 … +30 °C (−94 … +86 °F)

Dew point accuracy vs. measurement conditions

10

30

30

10

20

40

0

-10

-20

50

60

50

Temperature of measured gas (°C)

-10

0

-30

-40

-50

-60

60

70

-70

-80

40

20

range high limit

Dew point

measurement

Accuracy

< ±2 °C

Td

Dew point measurement range

lower limit

Accuracy

not specified

Accuracy

not specified

Dashed line:

For DMP74C the ±2 °C accuracy range is limited to −50 °C Td when used in SF6

gas.

Accuracy (B and C probe)

−60 … +20 °C (−76 … +68 °F)

±2 °C (±3.6 °F)

(see graph)

Response time

Flow rate 0.2 m/s, 1 bar pressure,

+20 °C (+68 °F)

63 % [90 %]

0 → −60 °C Td (32 → −76 °F Td)

50 s [340 s]

−60 → 0 °C Td (−76 → 32 °F Td)

10 s [20 s]

Dew point sensor

Vaisala DRYCAPâ 180M

Temperature

Measurement range

−10 … +60 °C (+14 … +140 °F)

Accuracy at +20 °C (+68 °F)

(−76 … +68 °F)

±0.2 °C (±0.36 °F)

Typical temperature dependence

of electronics

±0.005 °C/°C (±0.005 °F/°F)

Temperature sensor

Pt100 RTD Class F0.1 IEC 60751

Other variables available

Dew point converted to atmospheric pressure, ppm volume and ppm weight

concentration