8
SPM Flex Gas Detector
Glossary
Term Description
4-20 mA loop
An analog communication method using a current
loop to indicate concentration readings and fault
status�
Chemcassette
®
cartridge
An easy-to-install case that carries Honeywell’s
Chemcassette tape� Cartridges are specific to
different gas types/families�
Ethernet
Commonly used network technology for wired Local
Area Networks�
In monitor
The detector is actively monitoring the specified gas
or family of gases
Latching alarm or fault
When configured, the SPM Flex will hold the alarm or
fault status active until the user performs an alarm/
fault reset�
LCD
Liquid Crystal Display
LED
Light Emitting Diode
Modbus TCP
Communications protocol running over Ethernet that
is commonly used for communicating with industrial
devices�
Non-latching alarm or
fault
An alert in which the SPM Flex will reset
automatically when the condition is no longer
present (i�e�, the detector does not have to be reset
by the user)�
Out of monitor The detector is on but idle
Relay
An electrical-operation output switch that can be
used to indicate the presence of alarm and fault
conditions�
TWA
Time Weighted Average, the average exposure to a
harmful gas, usually calculated over a period of eight
hours (a the typical workday)�
USB
Universal Serial Bus is an industry standard
communications protocol and bus that is commonly
available on personal computers�
VDC
Volts of Direct Current
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