Vaisala PTB330 User Manual
ELECTRICAL CONNECTIONS
2008-08-04
VAISALA BAROCAP® DIGITAL BAROMETER PTB330
Operating voltage 10 ... 35 VDC
Typical power consumption at +20 °C
24 VDC, one pressure sensor)
(U
in
RS-232 25 mA
RS-485 40 mA
U
25 mA
out
I
40 mA
out
display and backlight + 20 mA
Analog outputs
current output 0 ... 20 mA, 4 ... 20 mA
voltage output 0 ... 1 V, 0 ... 5 V, 0 ... 10 V
External loads
current ouputs RL < 500 ohm
0 ... 1V output RL > 2 kohm
0 ... 5V and 0 ... 10V outputs RL > 10 kohm
Max wire size 1.5 mm2 (AWG 16)
Electrical Connections
WARNING
Figure 1 Signal and Power
Supply Screw Terminals
Make sure that you connect only de-energized wires.
Basic Wiring Using Screw Terminals
1. Open the four cover screws and open the barometer cover.
2. Insert the power supply wires and signal wires through the cable
bushing in the bottom of the barometer. Ground the screen of the
electrical cable.
3. Connect the RS-232 user port cables to terminals TxD, GND and
RxD on the screw terminal block. See Figure 1 on the left.
4. If you have the optional analog output module, connect the
cables to the terminals Ch+ and Ch– on the analog output
module. The terminals are shown in Figure 2.
5. When wiring the optional AC power supply, RS-485, or relay
module, refer to the PTB330 User’s Guide.
6. In case you need to ground the barometer housing, the grounding
connector is found inside the housing. Make sure that different
groundings are made to the same potential. Otherwise harmful
ground currents may be generated.
Figure 2 Analog output module
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7. Connect the power supply wires to (+) and (-) terminals marked
POWER 10 ... 36V=.
8. Close the cover and tighten the cover screws.
Ref. M210958EN-A
ELECTRICAL CONNECTIONS
2008-08-04
Wiring with M12 (8-Pin) Connector
Figure 3 Optional 8-Pin Connector
Table 1 Pin Assignments of the 8-Pin Connector
PIN/Terminal Wire Serial Signal Analog Signal
1 White Data out TX A – 2 Brown (serial GND) (serial GND) Signal GND (for both channels)
3 (optional) Green External power control (serial GND) Signal GND (for both channels)
4 Yellow - - Analog output
5 Grey Supply – Supply – Supply –
6 Pink Supply + Supply + Supply +
7 Blue Data in RX B – 8 Shield/Red Cable shield Cable shield Cable shield
RS-232 (EIA-232) RS-485 (EIA-485)
Wiring with Optional D-9 Connector
Figure 3 Optional D-9 Connector
Table 2 Pin Assignments of the D-9 Connector
PIN/Terminal Wire Serial Signal Analog Signal +
RS232
1 Red
2 White TX TX
3 Black RX RX
4 (optional) Yellow External power control External power control External power control
5 Brown Ground Ground
6 Green LO Aout
7 Blue Ground for supply
8 Grey HI AGND
9 Orange Supply voltage (10...30
RS-232 (EIA-232) RS-485 (EIA-485)
Ground for supply
voltage
VDC)
voltage
Supply voltage (10...30
VDC)
GND supply
Supply
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Ref. M210958EN-A
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