4 sensor replacement – ENMET MEDAIR 2200 User Manual

Page 27

2200

ENMET Corporation

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.

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

Corporation to calibrate the

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

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