Vaisala DMT345 & DMT346 Dew Point Transmitters

Features

  • Condensation-resistant
  • Unique auto-calibration feature
  • Dew point accuracy ±2 °C (±3.6 °F)
  • Modbus protocol support (RTU/ TCP)
  • Analog outputs, RS-232/485, WLAN/LAN
  • DMT345 measures humidity at temperatures up to 180 °C (356 °F)
  • DMT346 measures humidity at temperatures up to 350 °C (+662 °F)
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Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensor solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala DRYCAP Dewpoint Transmitters DMT345 and DMT346 are designed for humidity measurement in industrial drying applications with particularly high temperatures. DMT345 and DMT346 are built for direct measurement in hot processes. Therefore, there is no need for sampling systems and trace heating. As a result, high measurement accuracy and constancy are maintained. Moreover, DMT345 provides accurate humidity measurement in hot and dry conditions. This model provides unmatched dry-end measurement accuracy at temperatures up to 140 °C; however, it can operate safely at temperatures up to 180 °C.

Key Benefits

  • Accurate and reliable measurement with excellent long-term stability and fast response time.
  • Graphical display and keypad for convenient operation.
  • Optional alarm relays and mains power supply module.

Specification

Measurement Performance, DMT345
Dew Point
Sensor Vaisala DRYCAP 180S
Measurement range (-40…100 °C) (-40 … +212 °F) Td
Accuracy ±2 °C (±3.6 °F) Td
See the accuracy graph below
Response time 63 % [90 %] in flow rate 1 l/min and 1 bar pressure From dry to wet: 5 s [10 s] From wet to dry including autocalibration 45 s [5 min]
Temperature
Measurement range 0 … +180 °C (+32 … +356 °F)
Measurement range with sensor warming Upper range limited by humidity (at 80 %RH warming is switched on and T reading not actual process temperature)
Accuracy ±0.4 °C at 100 °C
Temperature sensor Pt100 RTD Class F0.1 IEC 60751
Relative Humidity
Measurement range 0 … 100 %RH
Measurement range with sensor warming 0 … 80 %RH
Accuracy below 10 %RH ±10 % of reading
Accuracy above 10 %RH ±1.5 %RH + 1.5 % of reading
Mixing Ratio
Measurement range (typical) 0 … 1000 g/kg (0 … 7000 gr/lbs)
Accuracy (typical) ±12 % of reading
Measurement Performance, DMT346
Dew Point
Sensor Vaisala DRYCAP 180S
Measurement range (-25 … +100 °C) (-13 … +212 °F) Td
Accuracy ±2 °C (±3.6 °F) Td
See the accuracy graph below
Response time 63 % [90 %] in flow rate 1 l/min and 1 bar pressure From dry to wet: 5 s [10 s] From wet to dry including autocalibration 45 s [5 min]
Mixing Ratio
Measurement range (typical) 0 … 1000 g/kg (0 … 7000 gr/lbs)
Accuracy (typical) ±12 % of reading
Inputs and Outputs, DMT345 and DMT346
Accuracy of analog outputs at 20 °C ± 0.05% full scale
Temperature dependence of analog outputs ± 0.005%/°C full scale
Max. wire size 0.5 mm2 (AWG 20) stranded wires recommended
Digital outputs RS-232, RS-485 (optional)
Protocols ASCII commands, Modbus RTU
Service connection RS-232, USB
Relay outputs 2+2 pcs (optional) 0.5 A, 250 VAC, SPDT
Operating voltage 10 … 35 VDC, 24 VAC ±20%
Operating voltage with optional power supply module 100 … 240 VAC 50/60 Hz
Default Start-up Time
Initial reading after power-up 3 s
Full operation after sensor purge and autocalibration Approx. 6 min
Power Consumption at 20 °C (Uin 24 VDC)
Uout 2×0 … 1V/0 … 5V/0 … 10V max. 25 Ma
Iout 2×0 … 20mA max. 60 mA
RS-232 max. 25 mA
Display and backlight (+ 20 mA)
During sensor purge max. + 110 mA
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
External Loads
Current outputs RL< 500 Ω
0 … 1V output RL > 2 kΩ
0 … 5V and 0 … 10V outputs RL > 10 kΩ
Ethernet Interface (Optional)
Supported standards 10BASE-T, 100BASE-TX
Connector 8P8C (RJ45)
IPv4 address assignment DHCP (automatic), static
Protocols Telnet, Modbus TCP/IP
WLAN Interface (Optional) DHCP (automatic), static
Supported standards 802.11b
Antenna connector type RP-SMA
IPv4 address assignment DHCP (automatic), static
Protocols Telnet, Modbus TCP/IP
Security WEP 64/128, WPA WPA2/802.11i
Authentication / Encryption (WLAN) Open / no encryption
Open / WEP
WPA Pre-shared key / TKIP
WPA Pre-shared key / CCMP (a.k.a.WPA2)
Optional Data Logger with Real-time Clock
Logged parameters Max. four with trend/min/max values
Logging interval 10 sec. (fixed)
Max. logging period 4 years, 5 months
Logged points 13.7 million points per parameter
Battery lifetime Min. 5 years
Display LCD with backlight, graphical trend display
Menu languages English, Chinese, Finnish, French,
German, Japanese, Russian, Spanish,
Swedish
Operating Environment, DMT345 and DMT346
Storage temperature (-55 … +80 °C )(-67 … +176 °F)
Pressure range for probes Slight pressure difference (~ 200 mbar)
Measured gases Non-corrosive gases
EMC compliance EN61326-1, Industrial environment1)
Mechanical Durability
Of probes Up to +180 °C (+356 °F) for DMT345
Up to +350 °C (+662 °F) for DMT346
Of transmitter body (-40 … +60 °C) (-40 … +140 °F)
With display 0 … +60 °C (32 … +140 °F)
1) Note: Transmitter with display test impedance of 40 ohm is used in IEC61000-4-5 (Surge immunity)
Mechanical Specifications, DMT345 and DMT346
Cable bushing M20 x 1.5 for cable diameter 8 … 11 mm / 0.31 … 0.43″
M20 x 1.5 for cable diameter 8 … 11 mm / 0.31 … 0.43″ 1/2″NPT
Housing material G-AlSi 10 Mg (DIN 1725)
IP rating IP66
IP65 (NEMA4X) with local display
Weight (depending on selected probe, cable, and modules) 1.0 – 3.0 kgs (2.2-6.6 lbs)
USB-RJ45 Serial Connection Cable 219685
Probe cable diameter 5.5 mm (0.2 in)
Standard probe cable lengths 2 m, 5 m or 10 m (Additional cable lengths available, please see order forms for details)
User cable connector (optional) M12 series 8-pin (male)
option 1 female plug with 5 m (16.4 ft) black cable
option 2 female plug with screw terminals

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