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1.6 +ve Safety™
+ve Safety™ is a quick and easy indication of the operating status of T4, this status is indicated by a
front mounted LED.
When the +ve Safety™ LED is illuminated green, this indicates that the unit is functioning as
required and no further action is necessary, such as bump testing or calibration. This enables users
and supervisors to easily see that the employee is safe and following work procedures.
When the +ve Safety™ LED is illuminated red this indicates that one of the following situations has
occurred and will require user action:
• Battery is critically low: The battery has a maximum of 30 minutes runtime before it will be
completely depleted.
This will be accompanied by additional alerts signifying a low
battery, see Section 1.3.
• Bump test is required: Bump test has failed or exceeded the due date required to meet site
procedures.
The bump test due date can be reviewed via the information menu,
see Section 2.8.2.
• Calibration is due: Calibration has failed or exceeded the due date required to meet the
site procedure.
The calibration due date can be reviewed via the information menu,
see Section 2.8.2.
• T4 is in gas alarm: This could be a high or low gas alarm, or a STEL or TWA alarm.
T4 display will indicate which alarm type has been activated by
the relevant icon being displayed on the screen, see Section 2.3.
• T4 fault: T4 must be reviewed by trained personnel for repair as T4 has
detected an internal fault.
An appropriate fault warning will also have been shown on the display.
Figure 7: +ve Safety™ indicators
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