SPM Single Point Monitor
SPM Technical Handbook
1-6
Do not confuse this two-minute alarm with the proper
response to the verification routine. To prevent the two-
minute alarm, do not leave the tape load lever (18) open
for more than two minutes.
Note:
The two-minute alarm will also activate
during Chemcassette
®
replacement if the tape
load lever (18) is left open for more than two
minutes.
1.9 Gas Concentration Conditions
Section 1.9.1 shows the SPM status reports of four
actual gas concentrations.
Press alarm reset (11) to return all alarms and relay
contacts back to their normal state. If the concentration
condition has not been corrected, the instrument
will revert to the alarm state during the next sample
period.
1.9.1 Gas Condition Reporting
Green
System
Status
LED (9)
Red
System
Status
LED (12)
Alarm
LED (16)
Audio
Signal
Display (19)
Sub-
alarm
Steady
On
Off Off Off
Actual
Concentration
Alarm 1
Steady
On
Off
Steady
On
On
Actual
Concentration
Alarm 2
Steady
On
Off
Flashing
Fast
On
Actual
Concentration
Above
Scale
Steady
On
Off
Flashing
Fast
On xxx + ppb/ppm
Notes:
1. Press alarm reset (11) to reset all alarm
indicators.
2. In actual gas condition, the display will
show last sampled concentration. In
simulated gas condition, the display will
normally reset to 0 and the 4-20 mA output
returns to 4 mA at the end of the sample
period unless a concentration is detected.
3. When unit detects an above full scale
condition, the display will show xxx + ppb/
ppm, e.g.: AsH
3
above full scale is 150 +
ppb; Cl2 above full scale is 1.50 +ppm.
1.10 Instrument Fault Condition
The SPM reports an instrument fault condition with
flashing red and green system status LEDs (9) and
(12), flashing relay disable LED (13), and an intermittent
audio signal.
Note:
The relay disable LED (13) does not ash for
the open tape load lever fault. (See Section
1.8.2).
The instrument fault relay will be activated, and the digital
display (19) will show (FAULT XX). See Section 4.7 for
information on fault codes.
To reset the unit after a fault condition, press alarm reset
(11). If the fault condition has not been corrected, the
SPM will revert back to the fault reporting status.
1.11 Disabling the External Alarm Relay
Contact
To disable the external concentration alarm relay
contacts, press relay disable (14). The red relay disable
LED (13) will light to indicate the disabled condition.
The instrument fault relay will change status whenever
you disable the concentration alarm relay. This feature
insures that personnel will be alerted to any change in
instrument monitoring status.
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