CM4 Four-Point Continuous Monitor
CM4 Technical Manual
1-8
1.7 Instrument Diagnostics
The CM4 provides diagnostic instrument fault and maintenance
requirement indications. These activate one of the following:
• One or both fault relays activate
• On-board memory stores most recent eight fault events for
later recall
• Fault information is sent to the printer (if enabled)
• Status LEDs light yellow for the appropriate point to indicate
instrument faults
• The display shows the fault information
• If the fault generated is an instrument fault and the CM4 is
appropriately configured, the current level on the optional analog
4-20 mA output port is reduced to 2 mA.
Condition
Point
Status LED
Point
Alarm LED
Relays
Activated
Beeping
Audio Alarm
Display
Monitoring
Green
OFF
All OFF
OFF
Current concentrations (each point displayed for four
seconds)
Level 1 alarm
Green
Red
(steady)
- Low level alarm for affected point
- General low level alarm
ON
Current concentrations
Level 2 alarm
Green
Flashing
red
- High and low level alarms for
affected point
- General high and low level alarms
ON
Current concentrations
Low Chemcassette maintenance fault (monitoring continues)
(See
)
Green
OFF
Maintenance fault
OFF
Current concentrations followed by fault message (as
last message in sequence)
Power interruption or CPU fault
OFF or
random
OFF or
random
Watchdog fault
OFF
Blank or random
Instrument Fault (monitoring continues on unaffected points)
Yellow
OFF
Instrument fault
OFF
Current concentrations followed by fault message (as
last message in sequence)
Instrument fault
(monitoring suspended)
Yellow
OFF
Instrument fault
OFF
Fault Message
Table 1-1: Instrument Alarms
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