ENMET AM-5175, Руководство пользователя, Страница: 13 / 21

AM-5175 ENMET Corporation
11
5.2 Calibration of the AM-5175
Calibration is the process of setting the instrument up to read accurately when exposed to the target gas. The Zero function sets
the clean air reference point and the Span function sets the sensitivity of the instrument.
Initial Calibration:
Wait at least 3 – 4 hours after initially supplying power to the
AM-5175
instrument before initial
calibration, overnight is preferred. The
AM-5175
has been pre-calibrated at the factory, and initial field calibration should
result in only fine-tuning to circuit, as well as a way to check that installation is successful. It is not necessary to open the
enclosure to make adjustment. The calibration functions are operated with pushbuttons from outside the enclosure through the
MENU
and
SELECT
switches.
Calibration Zero and Span functions are two separate procedures. They operate independently of each other. It is
recommended that the Zero procedure be done prior to the Span procedure.
ENMET Corporation recommends at least quarterly calibration of the AM-5175 instrument.
Calibration equipment is available from
ENMET
Corporation to calibrate the
AM-5175
instrument.
•
Calibration adapter, a length of tubing with a regulator for the gas cylinder on one end, and a calibration cup to connect to
the sensor of the
AM-5175
on the other.
•
Gas cylinder, Zero gas 20.9% oxygen or Span gas, factory determined, varies by intent.
Generally, a cylinder of 20.9% Oxygen is used to provide a Zero point or fresh air reference for the calibration.
N
OTE
:
Software revision may cause variations of display output.
Menu Select
Front View,
Attaching Calibration Cup
Side View,
Attaching Calibration Cup
Menu Select
Front View
with Cal Cup attached
Side View
with calibration Adapter
Figure 7: Calibration Adapter
Sensor
Gas Cylinder
Regulator
Calibration Cup
Calibration Cup
To Attach Calibration Cup:
Slide Down over the
retaining posts
To Remove Calibration Cup:
Slide Cup Up off the
retaining posts
Retaining Posts
2 places
Retaining Posts
2 places