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3-2

USER HANDBOOK

PS500

3.1.4 Toxic Alarm Limits

Each toxic range has 2 instantaneous alarm set points.

Additionally, toxic ranges also have user exposure alarms.

The instrument calculates the Short Term Exposure Limit

(STEL) and Long Term Exposure Limit (LTEL), known as Time

Weighted Average (TWA) readings.

Note: A Time Weighted Average (TWA) value is the mean

average gas level over a specic period. The STEL is

15 minutes and the LTEL is 8 hours. This averaging

makes the instrument single user applicable.

A option is available to reset the averaging after each

instrument switch-off, allowing multiple user use.

Note: It is important that the user ensures all alarm levels

are in accordance with their company’s procedures

and with regional health and safety legislation.

In the following examples, Fig. 3.1 shows a ‘LOLO’ Oxygen

alarm and Fig. 3.2 shows a ‘HIHI’ LEL alarm.

If more than one gas alarm level is exceeded, the gas value

will ash for each gas type in alarm.

Each alarm can be latching or non-latching.

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