C T I O N; Instrument Operations And Adjustments; Overview Of The Systems Operation; Front Panel Led's - EMS 1304 Installation And Operation Manual

Section 4

INSTRUMENT OPERATIONS AND ADJUSTMENTS

Overview of the systems operation

The Model 1304 Opacity monitor system consists of transceiver, retro reflector, service module and the control
unit. The maintenance module has a digital display for reading opacity from the control unit and T 2 from the
transceiver. It also has connections for attaching a meter for trouble shooting or calibration when necessary. Other
switches are provided for initiating zero and span modes during service or maintenance. If any switch causes the
system to read other than stack opacity the Control unit Fault Alarm system will be energized notifying the
operator. A fault output signal (open transistor collector) is also energized for use with other alarms or DAS
system, which need to know opacity readings are not representative of the actual stack opacity and a fault
condition exists.
Only two conditions are considered normal operation
initiated calibration check cycle.

Front Panel LED's

ALARM - Red LED is blinking when a Fault is detected. Manual Cal.
RUN - Green LED is on during normal operation and blinking if system is in S/M mode. The primary reason for
S/M mode is to prevent 4-20mA outputs from changing when user is modifying block ware.
- Red LED is on during normal operation.
OPERATE
- Red LED is on during calibration check mode.
AUTO/MAN
ZERO - Red LED is on when zero cal cycle is in progress, out during span or normal operation.
- Red LED is on when span cal cycle is in progress, out during zero or normal operation.
SPAN
- Red LED is on if opacity exceeds set point for more than the time delay (typically 30 seconds).
HIGH OPACITY
- Red LED always out this is not used.
REM/LOC

Fault Messages

Air purge low - Airflow to the transceiver and/or retro reflector is not sufficient.
No Stack Power - Indicates loss of service module power loss or other related power or component failure from
the service module.
T2 4-20 Lost/low - Transceiver 4-20mA current loop is out of specification or missing.
Maintenance Mode - Indicates a maintenance mode switch on the service module is in a position and the system
is not displaying or outputting the smoke reading.
Window Dust - Dirt has accumulated on the transceiver lens and/or the zero mirror in excess of the > 5% limit
and must be cleaned.
Zero Cal Fail - During calibration check the zero reading has exceeded the > 2% opacity set point.
Span Cal Fail - During calibration check the span reading has exceeded the > 2% opacity set point
Manual Cal - A manual calibration check from the control unit front panel AUTO/MAN key was pressed.
; 1- Reading smoke, 2- Computer or internal clock
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