8
DPM series Mass Flow Meters are equipped with calibrated 0-5Vdc, 0-10Vdc or
4-20 mA output signals. This linear output signal represents 0-100% of the flow
meter’s full scale range. The user may select the desired analog interface type
using a local OLED/Joystick interface or via digital communication interface.
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
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 output interface signal
lines.
3.3
Digital Communication Interface Connections
The digital interface operates via RS-232 or RS-485 (user-selected) and provides access to
all applicable internal configuration parameters and data.
CAUTION:
The 4-20 mA current loop output is self-powered (non-
isolated, sourcing type). Do not connect an external voltage source
(for example, current loop powered systems) to the output signals.
CAUTION:
When connecting the load to the output terminals, always
check actual analog output interface configuration. Connecting low
impedance (< 5K
ȍ
) 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 12 Vdc power input.
CAUTION:
When connecting the load to the output terminals,
always check actual analog output interface configuration.
Connecting high impedance (> 500
ȍ
) loads to the 4-20 mA output
may cause non linear or faulty operation of the electronics circuitry.
CAUTION:
Before proceeding with communication interface
connection, verify the meter’s actual communication interface type. For
devices with OLED display, the interface type will be briefly (for about
2 seconds) displayed on the banner screen when power is applied. If
your meter does not have a display, the communication interface type
can be identified by briefly pressing the multi-function button and
monitoring status LED response
(
see
Section 6.5).
