Vaisala DMT340 - Manual (Page 168)

User's Guide _______________________________________________________________________
166 __________________________________________________________________ M210704EN-G
ppmv (dry)
Measurement range (typical)
10 ... 2500 ppm
Accuracy (at + 20 °C, 1 bar) 1 ppm + 20% of reading
Other measurement parameters available (depends on model)
mixing ratio, absolute humidity, pressure dewpoint calculated to 1 bar,
temperature difference (T-Td), water vapor pressure
Operating Environment
Mechanical durability up to +180 °C (+356 °F)
for transmitter body -40 ... +60 °C (-40 ... +140 °F)
with display 0 ... +60 °C (32 ... +140 °F)
Storage temperature range
without display -55 … +80 °C (-67 … +176 °F)
with display -40 … +80 °C (-40 … +176 °F)
Pressure and temperature range for probes see probe specifications
Measured gases non corrosive
Electromagnetic compatibility EN61326-1: Electrical
equipment for measurement,
control, and laboratory use –
EMC requirements – for use in
industrial locations
Inputs and Outputs
Operating voltage 10 ... 35 VDC, 24 VAC
with optional power supply module 100 ... 240 VAC 50/60 Hz
Default start-up time after sensor Purge and Autocal About 6 min
Start-up time after power-up 3 s
Power consumption at 20 °C (Uin 24VDC)
RS-232 max 25 mA
Uout 2 x 0 ... 1V / 0 ... 5V / 0 ... 10V max 25 mA
Iout 2 x 0 ... 20 mA max 60 mA
display and backlight + 20 mA
during sensor purge + 110 mA max
Analog outputs (2 standard, 3rd optional)
current output 0 ... 20 mA, 4 ... 20 mA
voltage output 0 ... 1 V, 0 ... 5 V, 0 ... 10 V
Accuracy of analog outputs at 20 °C ± 0.05 % full scale
Temperature dependence of the analog outputs ± 0.005 %/°C full scale
External loads
current ouputs RL < 500 ohm
0 ... 1V output RL > 2 kohm
0 ... 5V and 0 ... 10V outputs RL > 10 kohm
Wire size 0.5 ... 2.5 mm
2
(AWG 20 ... 14)
stranded wires recommended
Digital outputs
RS-232
RS-422/485 (optional)
LAN (optional)
WLAN (optional)
Protocols ASCII commands
Modbus RTU
Modbus TCP