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SPM Flex Gas Detector
Monitoring
The available gases are displayed and can be selected from the Gas menu�
Alarms 1 and 2 can be enabled or disabled and their respective setpoints can be
adjusted� The LDL can also be enabled or disabled and user-defined LDL limits
can be entered� The minimum and maximum values for the 4-20 mA full scale can
be entered�
The TWA mode can be set for either a fixed start time or a floating start time at
the TWA menu� The default is 08:00 but another time can be entered by the user�
In this case, the detector will calculate the second time (8 hours later) and third
time (16 hours later)�
Before storing the detector following a gas event, purge the flow system by
operating the detector in clean air until it returns to zero� If the case must be
wiped down, install push fittings in the Sample In/Out ports to prevent fluids from
entering the detector�
The detector’s continuous monitoring algorithm enables a fast response and
high sensitivity� It also rapidly indicates trends� However, in some cases, this
algorithm can cause the decay time to be substantial, especially with gases
having slow stain development, specifically low level AsH
3
and GeH
4
� In
the absence of gas, it may be necessary to continue monitoring for several
minutes before zero concentration is reported�
NOTE
Latching
The SPM Flex detector’s alarms and faults can be either latching or non-latching,
depending on the settings on the Latching menu� The default for both is latching�
Outputs
The detector’s display characteristics (e�g�, brightness, time to dim/time to off)
are set at the Display menu� The volume of the alarms (silent, low, medium, or
high) are chosen from the Audio menu options� Parameters set from the Relays
menu are relay assignments, that alarm relay’s normal state (energized or de-
energized), and the maintenance fault’s normal state (energized or de-energized)�
Three parameters can be set from the 4-20 mA Levels menu: the inhibit level from
1�5 mA to 3�5 mA (the default is 2�0 mA), the maintenance fault level from 1�5 mA
to 3�5 mA (the default is 3 mA), and the overrange level from 21�0 mA to 22�0 mA
(the default is 21�5 mA)� The mA levels are adjusted in 0�5 mA increments�
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