Instrument Setup And Calibration; Warning; Calibrating The Orion Plus Multigas Detector - MSA Orion plus Manual De Operación

Chapter 5,

Instrument Setup and Calibration

Attention! Special conditions with toxic gases!
If the instrument is to be checked or calibrated for toxic
gases, prerequisites are required; otherwise, incorrect
calibration would result in incorrect instrument operation.
Toxic gases (e.g., chlorine, ammonia) have the property of diffusing into
rubber and plastic tubes so the volume of test gas available in the
instrument would no longer be sufficient to correctly perform instrument
calibration.
For this reason, when calibrating the instrument with toxic gases,
certain prerequisites are required:
• a special pressure reducer
• short connection tubes between the pressure reducer and the
instrument (approximately one inch)
• connection tubes made from a material which does not absorb the
test gases (e.g., Teflon).
NOTE: If using normal tubes and pressure reducers, expose them to
the relevant test gas for an extended time period.
For example:
for chlorine, allow the entire contents of a test gas cylinder to
flow through the tubes and the pressure reducer.

Calibrating the Orion plus Multigas Detector

The Orion plus Multigas Detector is equipped with a password-
accessible autocalibration feature to prevent unauthorized access to
calibration. This autocalibration function will only operate with
configurations shown in TABLE 5-1.
The Autocalibration sequence resets, instrument zeroes, and adjusts
sensor calibration for known concentrations of calibration gases.

" WARNING

5-1