HMT330 DMT340 MMT330 Wiring Diagram in English
ELECTRICAL CONNECTIONS
2006-06-15
VAISALA TRANSMITTERS HMT330, DMT340 AND MMT330
Power supply:
Operating voltage
with optional power supply module
Power consumption @ 20 °C (Uin 24VDC)
RS-232
Uout 2 × 0 ... 1V / 0 ... 5V / 0 ... 10V
Iout 2 × 0 ... 20 mA
display and backlight
during sensor purge
Analog outputs (2 standard, 3rd optional)
current output
voltage output
External loads
current ouputs
0 ... 1V output
0 ... 5V and 0 ... 10V outputs
Max wire size
10 ... 35 VDC, 24 VAC
100 ... 240 VAC, 50/60 Hz
max 25 mA
max 25 mA
max 60 mA
+ 20 mA
+ 110 mA max
0 ... 20 mA, 4 ... 20 mA
0 ... 1 V, 0 ... 5 V, 0 ... 10 V
RL < 500 ohm
RL > 2 kohm
RL > 10 kohm
0.5 mm2 (AWG 20) stranded wires recommended
Electrical Connections
WARNING
Make sure that you connect only de-energized wires.
Signal and Power Supply Wiring
1. Open the transmitter cover by taking out the four cover screws.
2. Insert the power supply wires and signal wires through the cable
bushing in the bottom of the transmitter. Ground the screen of the
electrical cable.
3. Connect the analog output cables to terminals: Ch1+, Ch1–, Ch2+,
Ch2–, see Figure 1 on the left. Connect the RS-232 user port cables to
terminals RxD, GND and TxD.
4. When wiring optional 240 VAC power supply, RS-485, relay module
or additional analog output module, see the appropriate user guide.
5. Connect the power supply wires to the connectors: POWER
10 ... 35V+ 24V~ (+) and (–) terminals. If you are using 24 VAC power
supply, see the caution below before connecting the supply wires.
Figure 1 Signal and Power
Supply Screw Terminals
CAUTION
Avoid ground loops when using 24 VAC power supply. Use of power supply with
floating ground is recommended. Connect NULL wire to "–" connector of
transmitter and PHASE to "+" when using 24 VAC power supplies.
If you are using single 24 VAC power supply to power multiple transmitters, never
connect same wire to"+" connector of a transmitter and to "–" connector of another
one.
www.vaisala.com
Ref. M210789EN-A
ELECTRICAL CONNECTIONS
2006-06-15
Wiring with Optional 8-Pole Connector
Figure 2 Optional 8-Pole Connector
Table 1 Wiring of 8-Pin Connector
PIN/Terminal
Wire
1
2
White
Brown
Serial Signal
RS-232 (EIA-232)
Data out TX
(serial GND)
3
4
5
6
7
8
Green
Yellow
Grey
Pink
Blue
Shield/Red
Supply –
Supply +
Data in RX
Cable shield
Analog Signal
RS-485 (EIA-485)
A–
(serial GND)
Supply –
Supply +
B–
Cable shield
Signal GND (for
both channels)
Ch 2+
Ch 1 +
Supply –
Supply +
Cable shield
Grounding the Cables
Ground the screen of the electrical cable properly to achieve the best possible EMC
performance.
Grounding the Housing
In case you need to ground the transmitter housing, the grounding connector is
found inside the housing. Note however that the probe head is connected to the
same potential as the housing. Make sure that different groundings are made to the
same potential. Otherwise harmful ground currents may be generated.
Taking into Use
Turn on the power. The indicator led on the cover lit continuously during normal
operation. Close the cover and replace the cover screws. The transmitter is ready
for use.
www.vaisala.com
Ref. M210789EN-A
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