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5. Operation
5.1 Power On
When power is connected, the device begins the start-up cycle, divided into two phases: Start -up and Warm-up.
The start-up sequence lasts around 20 seconds, during which the main functions of the gas detector are initialized and
verified. In this phase, the LEDs on the front panel are activated in sequence, and the device cannot yet be used.
At the end of the start-up sequence, the warm-up phase commences, during which the sensor output signal is adjusted
and stabilized. In this phase, the device can be used to detect gas and installation can be completed via the rotary switch,
app or controller; nonetheless, the measurement is less reliable, and calibration is not possible. During the warm-up
phase, the green LED flashes around twice every second. The duration of the warm-up phase depends on the sensor
technology used.
• Semiconductor = 5 min
• Infrared = 2 min
The duration of the warm-up phase may also vary according to environmental conditions. In this phase it is important not
to cause sudden changes in gas concentration, so as to avoid compromising correct measurement by the sensor.
The sensors may take longer to warm up than specified; in these cases, do not take any action, wait for the device to
stabilize. The time needed for complete stabilization of the device may vary from 2 (two) hours (minimum time) to 24
hours (recommended time).
5.2 Device Operating States
The CRLDS-1000 and CRLDS-CO2 Gas Detectors provide visual indications of their current operating status, in addition to
the relay outputs. Visual indication of device operating status is provided by three LEDs (green/red/orange). Device status
and the corresponding outputs are displayed in the following table:
Status LED Warning Fault/Relay Alarm Relay
Warm-up OFF OFF
Normal
OFF OFF
Bluetooth®
OFF OFF
Serial Connected Internal LED W8 on steady --- ---
Warning Delay
OFF OFF
Alarm Delay (RWF
*
= 0) ON OFF
Alarm Delay (RWF
*
= 1) OFF OFF
Warning (RWF
*
= 0) ON OFF
Warning (RWF
*
= 1) OFF OFF
Alarm (RWF
*
= 0) ON ON
Alarm (RWF
*
= 1) OFF OFF
Fault (RWF
*
= 0) ON ON
Red and yellow on steady, Green LED OFF
Fault (RWF
*
= 1) ON OFF
Red and yellow on steady, Green LED OFF
*
RWF = Relay WF Modbus Register
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