Analog Inputs - Current Input
The analog inputs can be used to receive readings from a pressure or temperature transmitter for use in any flow run. An
-
alog Inputs 1 to 7 can be configured through the web-interface for 0 to 20 mA or 4 to 20 mA signals. Alternatively, they
can be used to log measurements from any device with a compatible analog output. An on-board resistor is automatically
enabled when a current input is configured in the QRATE Scanner 3300 web interface. Therefore, no external resistor is
required for use with a current input.
Through the web-interface, the device can be configured to provide 8.5 to 24 VDC at 20 mA for powering a 0 to 20 mA
or 4 to 20 mA transmitter. For reduced power consumption, disable analog inputs in the QRATE Scanner 3300 web inter
-
face when they are not in use. Wire as shown in
.
A IN 1,2,3,4, 5,6,7
P
0 to 20 mA or 4 to 20 mA analog input
*Internal 240
Ω
between
+
and
-
.
0 to 20 mA or
4 to 20 mA
Transmitter
9 to 30 VDC
Power Supply
External Supply
Internal Supply
A IN 1,2,3,4, 5,6,7
P
0 to 20 mA or 4 to 20 mA analog input
*Internal 240
Ω
between
+
and
-
.
0 to 20 mA or
4 to 20 mA
Transmitter
Figure 3.10 - Current Analog Input
Digital Inputs - Contact Closure
The digital contact closure input (
) provides an input for use with any relay contact switch. DIO 1 through
DIO 4 are galvanically isolated and are limited to 60 mA. DIO 5 and DIO 6 are non-isolated and are limited to 500 mA.
To configure a contact closure using the QRATE Scanner 3300 web interface, choose
Contact Closure
as the input type
and select a trigger state to indicate whether the pulse will trigger when the signal is high or when it is low.
DIO 1 to 6
COM (-)
Signal (+)
Relay
Contact
DIO 1 to 4 are galvanically isolated (max 60 mA)
DIO 5,6 are non-isolated (max 500 mA)
Figure 3.11 - Digital contact closure
55
QRATE Scanner 3300 integrated control flow computer
Section 3
