Emerson ROSEMOUNT Analytical IMPS 4000 Instruction Manual page 11

Instruction Manual
IM-106-400 IMPS, Rev. 2.0
February 2009
Figure 1-2. IMPS Components
Inner Assembly
The inner assembly consists of the PLC, PC board, pressure regulator, gas
solenoids, test gas pressure switches, and heater.
1. The PLC consists of a power supply, Central Processing Unit (CPU),
and three I/O modules.
a. The power supply supplies the voltage and current needed to
operate the IMPS 4000.
b. The CPU controls most system operations. It contains the program
memory in which the information entered into the PLC operator
interface is stored, and it processes the I/O signals received from the
I/O modules.
c. The I/O modules are terminated on the PC board. They receive and
send signals between the PLC and PC board for communication
between the oxygen transmitter and the IMPS 4000.
2. The PC board contains all wiring connections for up to four oxygen
transmitters.
3. The pressure regulator ensures the instrument air (reference gas)
flowing to the oxygen transmitter is at a constant pressure. The
regulator also has a drain valve that drains excess moisture from the
internal gas circuit.
4. The manifold can have up to six solenoids: test gas 1 solenoid, test gas
2 solenoid, and a gas solenoid for each oxygen transmitter connected to
the IMPS 4000. The solenoids activate and deactivate to allow test gas
to flow between the IMPS 4000 and an oxygen transmitter.
4000 IMPS
1-3