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3.3 Analog Output Signals Connections
CAUTION: When connecting the load to the output terminals, do not exceed
the rated values shown in the specifi cations (see Section 5). Failure to do so
might cause damage to this device. Be sure to check if the wiring and the
polarity of the power supply are correct before turning the power ON. Wiring
error may cause damage or faulty operation.
DPC series Mass Flow Controllers are equipped with calibrated 0-5Vdc, 0-10Vdc or 4-20
mA output signals. This linear output signal represents 0-100% of the fl ow controller’s
full scale range. The user may select the desired analog output interface type using a local
OLED/Joystick interface or via digital communication interface.
CAUTION: The 4-20 mA current loop output is self-powered (nonisolated,
sourcing type). Do not connect an external voltage source (for example,
current loop powered systems) to the output signals.
For 0-5 VDC, 0-10 VDC or 4-20 mA output signal connection:
External load Plus (+) --------------------------- pin 6 of the 8-pin Mini-DIN connector
External load Minus (-)--------------------------- pin 4 of the 8-pin Mini-DIN connector
CAUTION: When connecting the load to the output terminals, always check
actual analog output interface confi guration. Connecting low impedance
(< 5K ) loads to the 0-5Vdc or 0-10 Vdc output may cause damage to or
faulty operation of the electronics circuitry.
NOTE: 4-20 mA analog output requires at least 14 Vdc power input.
CAUTION: When connecting the load to the output terminals, always check
actual analog output interface confi guration. Connecting high impedance
(> 500 ) loads to the 4-20 mA output may cause non linear or faulty
operation of the electronics circuitry.
To eliminate the possibility of noise interference, it is recommended that you use a separate
cable entry for the DC power, digital communication interface, and analog input/output
interface signal lines.
3.4 Digital Communication Interface Connections
The digital interface operates via RS-232 or RS-485 (user-selected) and provides access to
all applicable internal confi guration parameters and data.
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