User Manual

29 • Setup Mode SC-01 Operator’s Manual
setpoint. The unit will proceed to the TWA Screen. The TWA setpoint is
flashing.
8. Use the AIR ▼ and ▲ DISP buttons to adjust the TWA setpoint to the
desired value. To turn the TWA alarm off, adjust the alarm point down to
towards zero and continue to adjust it down with the AIR ▼ button until
“OFF” is displayed.
9. Press and release the POWER button to accept the displayed TWA
setpoint. The following LCD will show the following screen before
returning to the ALARM-P screen.
The standard alarm point settings for the various models of the SC-01 are
listed below in Table 6.
Table 6: Standard Alarm Point Settings
Target Gas Warning Alarm STEL TWA
Ammonia (NH
3
) 25.0 ppm 35.0 ppm 35.0 ppm 25.0 ppm
Arsine (AsH
3
) 0.50 ppm 1.00 ppm OFF OFF
Chlorine (CL
2
) 0.50 ppm 1.00 ppm 1.00 ppm 0.50 ppm
Carbon Monoxide (CO) 25.0 ppm 50.0 ppm OFF 25.0 ppm
Hydrogen Cyanide (HCN) 5.0 ppm 10.0 ppm 4.7 ppm OFF
Hydrogen Sulfide (H
2
S) 10.0 ppm 20.0 ppm 15.0 ppm 10.0 ppm
Phosphine (PH
3
) 0.30 ppm 0.60 ppm 1.00 ppm 0.30 ppm
Sulphur Dioxide (SO
2
) 2.00 ppm 5.00 ppm 5.00 ppm 2.00 ppm
TWA
5.00
PPM
ALARM-P
End
PPM