Ametek Land 4500 MKIII, User Manual

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Opacity and Dust Monitor
User Guide
Model 4500 MkIII
A - 22
A4 AFU-APS-I/O Auxiliary Function Unit
A4.1 Description
The Auxiliary Functions Unit (AFU) side of the AFU-APS-I/O provides
additional communications and control facilities for the Model 4500 MkIII:
•
2 isolated 4 - 20 mA current loop outputs
• 2 alarm relays
• 4 status and calibration relays
• 4 blower status inputs
• 4 fail-safe shutter status inputs
• 2 fail-safe shutter control outputs
• 4-wire Modbus port
• RS232 or RS485 diagnostic port
• 110 v or 230 V ac mains power supply (with APS)
• Circuit breakers and terminals for ac supply distribution (with APS)
The AFU connects to the Transceiver via its RS485 Modbus port.
A4.2 Location
If the AFU is used to provide connections to Blowers and Fail-safe shutters, it
must be located close to the 4500 MkIII Transceiver.
4500 MkIII AFU-APS-I/O
4 to 20mA output (x1) • •
2-wire RS485 Modbus • •
In Cal relay • •
Alarm relay • •
System OK relay • •
Mains power input •
4-wire Modbus •
Additional Modbus port •
Shutter connections (24 V) •
Pressure switch connections •
Calibration trigger I/P •
4 to 20 mA output (x2) •
Zero and Span cal relays •
Fuel Selection (for dust measurement) •
Mains power to blowers •
-40°C Operation • •