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Model TS420
10
CALIBRATION INDICATOR
CAL MODE
Magnet Applied
❑ ■
Magnet Recognized
■ ❑
Cal Proceeding
✹ ✹
Figure 6 Flow Diagram
NOTE - If the unit fails to calibrate a flashing “MODE” LCD will be displayed. The sensor must
see “clean” air for at least fifteen (15) minutes before a second calibration is attempted by
reapplying the magnet.
4.4 Calibration Equipment
General Monitors offers flow calibration kits as the method of introducing calibration gas to the
TS420. (See Section 5.5).
Calibration is performed with 20.9% V/V O
2
.
NOTE - When removing regulator from gas cylinders, open value on regulator to ensure that
gas is purged and pressure in the regulator is relieved. Be sure to follow this recommendation
when switching cylinders.
WARNING – Do not use a gas cylinder if the regulator gage shows the cylinder pressure in the
black area just above 0 psi. Unstable calibration could result.
If the TS420 is to be used with the optional Splash-Guard, all calibrations must
be performed
using the calibration cup (Figure 7) with the Splash-Guard installed onto the TS420. In addition,
all gas checks must be performed using the calibration cup with the Splash-Guard installed.
This performs two functions:
1. It provides a more accurate representation of the amount of gas getting to the sensor.
2. It checks that the Splash-Guard is not clogged and that gas can get to the sensor.
Figure 7 Calibration Cup
If the Splash-Guard will not be used, the TS420 must be calibrated and gas checked with the
calibration plug (Figure 8)
Figure 8 Calibration Plug