Crowcon Gas-Pro - Accepting and Clearing Alarms

25
2.5.4 Accepting and clearing alarms
Setting Alarm 1 Alarm 2
Non-latched Alarms will not be latched returning
to non-alarm state without user
acceptance
Alarm can be turned off only when gas
has returned to acceptable levels
Latch Accept Allows the user to silence alerts but
remains in alarm. Once gas has
returned to acceptable levels the user
needs to accept the state.
Alarm can be turned off only when gas
has returned to acceptable levels
Latched Alarm can be turned off only when gas
has returned to acceptable levels
Alarm can be turned off only when gas
has returned to acceptable levels
i
While in alarm, the Gas-Pro will continue to record levels of all the gases being monitored.
2.5.5 Sensor types
The Gas-Pro can be tted with the following sensor types:
• Oxygen
• Electro-chemical
• Infra red (IR)
• Pellistor
• Photoionization Detector (PID)
2.5.5.1 Oxygen sensors
These sensors are in the form of an electro-galvanic fuel cell which is an electrical device used to
measure the concentration of oxygen gas in the ambient air. Set as default with both higher and
lower alarm levels.
2.5.5.2 Electro-chemical sensors
Electrochemical gas sensors measure the volume of a target gas by oxidising or reducing the target
gas at an electrode and measuring the resulting current.
2.5.5.3 Infra red sensors
Gas is pumped or diffuses into the sample chamber, and gas concentration is measured electro-
optically by its absorption of a specic wavelength in the infrared (IR).
Contents
Exit
Prologue
Operation
Gas testing
Maintenance
PC software
Accessories
Specication
Troubleshooting
Appendices
Warranty
Set-up