Vaisala DMT143 - Manual (Page 72)

USER'S GUIDE ____________________________________________________________________
70 ___________________________________________________________________ M211435EN-E
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Figure 24 Dewpoint Accuracy vs. Measurement Conditions
Table 15 Operating Environment
Property Description / Value
Temperature* -40 … +60 °C (-40 ... +140 °F)
Relative humidity 0 ... 100 %
Pressure*
0 … 50 bara (0…725 psia)
Measured gases Non-corrosive gases
Sample flow rate No effect on measurement accuracy
* Note that measuring in temperatures below 0 °C or pressures over 20 bara (290 psia) requires a
supply voltage of 24 ... 28 VDC.
Table 16 Outputs
Property Description / Value
Analog output (scalable) 4 ... 20 mA (3-wire)
0 ... 1 V/5 V
1 ... 5 V
Resolution for current output 0.002 mA
Resolution for voltage output 0.3 mV
Typical temperature dependence 0.005% of span / °C
Digital output RS-485, non-isolated
Vaisala Industrial Protocol
Connector 4-pin M8 (IEC 60947-5-2)
0 20
20
0
10
30
-10
-20
-30
10 30 40 50 60
40
Dewpoint
temperature
(°C)
Temperature of measured gas (°C)
-40 -30 -20 -10
-40
-50
-60
-70
50
60
70
-80
-90
Accuracy
±4 °C Td
Not recommended for
continuous measurement
Accuracy
±2 °C Td
Accuracy not specified
Dewpoint measurement low limit