ENMET MedAir 2200, Руководство по эксплуатации и обслуживанию, Страница: 27 / 41

MedAir ENMET
Manual Release Date – June 9, 2017 P a g e | 26
Manual Part No. – 80002-042
5.4 Sensor Replacement
5.4.1 Oxygen / Gas Sensor
A Gas sensor must be replaced when it can no longer be calibrated. To replace a sensor, perform the following steps.

Turn off the electrical power. The sample air can continue to flow.

Open the display panel and remove the four manifold retention screws and remove the manifold. See Figure 9 .

Remove the old sensor, and replace it with a new sensor.
C
AUTION
: Some new sensors come with a shorting clip that must be removed before installation, for proper operation. See
Figure 8 .

Replace the manifold.

Turn on the electrical power.
Figure 9: Location of Gas Sensor and Dew Point Manifolds
5.4.2 Calibration/Sensor Replacement
Sensor replacement requires that a Factory calibration be preformed. Factory calibration allows the instrument to properly set
operational parameters for each sensor
Calibration is the process of setting the instrument up to read accurately when exposed to a target gas. This is a two step
process. A Low Calibration sets clean air reference point and the High Calibration function sets the sensitivity of the
instrument.
Calibration equipment is available from
ENMET to calibrate the M
ED
A
IR
2200 . A list of needed material is in Section 7.0. A
calibration adapter will have a fitting for the gas cylinder on one side, and a quick-disconnect to attach to the instrument on the
other.
You may exit the calibration section, at any time, by
pressing and holding the
OPTION
switch for 3 seconds, if entering
calibration section by mistake or calibration gas is not available.
Wait 24 hours after initially supplying air and power to the
M
ED
A
IR
2200 sensor before initial calibration. It is not necessary
to open the Front Panel to make adjustment. The calibration functions are operated through the
OPTION
and
SELECT
switches
on the front panel.
Dew Point Probe Manifold
Retaining Screw, 2 places
Gas Sensor Manifold
Retaining Screw, 4 places
Remove Shorting Clip
from Cell if Present
Bottom View of Sensor
Figure 8: Shorting Clip
Ref: Orifice & Pre-filter
MOS
Sensor
CO2