TVOC 2 MANUAL
Ion Science Ltd
Page 16 of 32
Unrivalled Gas Detect
ion.
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Operation
Start-Up
After electrical power is connected, TVOC 2 runs through a ‘Start-up’ routine, which lasts for approximately 1 minute.
During this ‘Start-up’ routine TVOC 2 demonstrates the following characteristics:
•
The LCD screen displays the software version number
•
The green LED flashes
•
The 4-20 mA output is set to 4 mA (0.0 ppm)
Update Rate
TVOC 2 has a fixed output update rate of one second.
LED’s
Diagram 11 shows the location and function of the four LED indicators
The green indicates TVOC 2’s working status:
ON
Indicates the PID lamp is OFF
Flashing
Indicates the PID lamp is ON
A red indicates fault status:
ON
Indicates TVOC 2 cannot function correctly. The 4-20mA output drops to
3.5mA. URGENT attention is required.
Flashing
Indicates the TVOC 2 cannot function but a reading is being attempted
A yellow Zero LED indicates during normal operation
ON
Last calibration zero level was outside expected limits
(The instrument will operate normally with the previous calibration)
A yellow Span LED indicates during normal operation
ON
Last calibration Span level was outside expected limits
(The instrument will operate normally with the previous calibration)
Please see Calibration section for YELLOW LED states.
