Land 4500 MKII Premier, Руководство по эксплуатации и обслуживанию

Страница: 12 / 139

Model 4500 Premier Dust and Opacity Monitor
12
Analogue Output
The Model 4500 Premier Dust and Opacity Monitor has two current loop outputs available. Each one
may be set independent of the other to output one of the six functions below:
Opacity Dust
Constant Current Calibration Drift
Optical Path Length Ratio Optical Density
All the options can be set to ‘TRACK’ or ‘HOLD’ the measurement signal during calibration routines. If
‘TRACK’ is set, the measurement signal will continue to be output during calibration and if ‘HOLD’ is
set the measurement signal will remain at the last recorded reading before calibration until the calibration
routine is complete.
Relay Outputs
Located on the key panel of the 4500 Premier are five LEDs which light to indicate the operation of the
following relay outputs:
SYSTEM OK
ZERO CALIBRATION
SPAN CALIBRATION
2 ALARMS
Remote Calibration Initiation
Calibration of the monitor may be initiated remotely from a Control Room Unit. (Part number Panel
Mount 099.437 or Wall Mount 703.880) or via a contact closure.
Computer Interface Operation
The Model 4500 Premier Dust and Opacity Monitor may be connected to a computer or data acquisition
system via an RS232 or RS485 Modbus interface inside the Termination Box.