Calibration; Required Calibration Gases And Tubing; Connections - Ametek Thermox 2000 ATEX Series User Manual

3-12 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX

Calibration

Required Calibration Gases and Tubing

See "Specifications" for required pressure/flow of calibration gases.
NOTE
The span gas is the high gas. The zero gas is the low gas.
Use dry calibration gases that are free of oil and dirt. Stainless steel tubing
is recommended.
The span gas must be 10 times greater than the zero gas.
For example, if the zero gas is 1% O
higher.
O span gas- air or from 1.0% to 100% O
2
O zero gas - from .1 to 10% O
2
Combustibles span gas - 60 to 80% (ppm range) or 40 to 60% (percent
range) of the full combustibles operating range in certified mixtures of
equal parts CO + H
Example: If using an operating range of 0 to 2000 ppm combus-
tibles, use 800 ppm CO, 800 ppm H
using a 0 to 1% combustibles range, use 0.3% CO, 0.3% H
2% O , balance N
2

Connections

Connect instrument air to the sensor purge inlet. Maintain the pressure
and flow as directed on the purge warning label.
The purge apparatus provided by Thermox meets requirements for
!
hazardous locations under certain conditions.
WARNING
• Do not exceed the maximum temperature rating listed in the
Specifications Chapter.
, the span gas must be 10% O
2
2
, balance N
2
, with an equal amount of O
2
.
2
2
or more, balance N
2
, 1 to 2% O , balance N
2 2
or
2
.
2
. If
2
, 1 to
2