Hach sc200, Руководство пользователя

Страница: 217 / 875

CATEGORY 38: ULTIMA XIR METHANE
To detect the following gases, recalibrate with 2.5% methane
and set the span gas value accordingly:
Methane 50
CATEGORY 39: ULTIMA XIR NON-METHANE
To detect the following gases, recalibrate with 2.5% methane
and set the span gas value accordingly:
Butane, .6% propane 28 Hexane, .6% propane 41
Cyclopentane, .6% propane 30 Pentane, .6% propane 33
Ethane, .6% propane 25 Propane, .6% propane 29
Ethylene, .1% propane 28
Example: If measuring gases or vapors that appear in TABLE 2-2,
Category 2 and Category 3, you should calibrate to the Category 3 span
value (55% LEL) with .6% propane by volume applied.
If the gas or vapor you are measuring does not appear in the
TABLE 2-2 categories, consult MSA 1-800-MSA-INST for the proper
setting. If you wish to calibrate to the specific LEL of the gas or vapor
being measured, the expected span gas value of the Ultima/Ultima X
Series Gas Monitor can be changed by the Ultima Controller.
Ultima/Ultima X Series Gas Monitor Calibration
To ensure a fully functional sensor, perform calibration
checks and adjustments at initial start-up and at
regular intervals.
As with any type of gas monitor, the only true check of its performance
is to apply gas directly to the sensor. The frequency of the calibration
gas tests depends on the operating time and chemical exposures of the
sensors. New sensors should be calibrated more often until the
calibration records prove sensor stability. The calibration frequency
can then be reduced to the schedule set by the safety officer or
plant manager.
In some cases, it may be necessary to perform only a zero function of
the Gas Monitor in lieu of a full zero and span procedure. Check with
your safety officer or safety engineer to determine if only a zero function
is necessary.
"
WARNING
2-9