[MI 019-100] Universal Instruction Manual I/A Series Mass Flow ...

MI 019-100 – December 2003
2. Installation
POSITIVE POWER INPUT
TERMINAL (5)
PULSE OUTPUT
TERMINAL (4.1 OR 4.2)
R1
200 Ω
2 W
R2
100 Ω
2 W
+ –
24 V dc
3 kΩ
12 V
I Bias
RECEIVER
Figure 15. Pulse Wiring with Divider Network
For example:
For a receiver with V (high) = 8 - 24 Volts,
V (low) = 1 Volt Maximum, and
Impedance = 3 kΩ to 12 V
Vin (low) with single resistor of 300 Ω = (12)(300/3300) = 1.09 V which is too high
Vin (low) with divider network = (12)(100/3100) = 0.39 V which is acceptable.
Combination of Outputs
A typical wiring diagram for Output Signal Code 1, which contains all of the above, is shown in
Figure 16.
CONTACT OUTPUT
PULSE OUTPUT
4.2
4.1
LOAD
LOAD
CONTACT INPUT
CURRENT OUTPUT
4
6
LOAD
COMMON
Figure 16. Typical Wiring Diagram (Output Signal Code 1)
The power supply voltage is limited to the most restrictive requirements of the outputs used.
HART Multidrop Communication
5
+ –
24 V dc
“Multidropping” refers to the connection of several transmitters to a single communications
transmission line. Communications between the host computer and the transmitters takes place
digitally with the analog output of the transmitter deactivated. With the HART communications
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