4 sensor replacement – ENMET GSM-60 User Manual

Page 27

GSM-60

ENMET Corporation

5.4 Sensor Replacement

5.4.1 Gas/Oxygen 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 PiD(HC) 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

GSM-60

. 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

GSM-60

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.

PiD (HC) Sensor Manifold

Gas Sensor Manifold

Retaining Screw, 4 places

Remove Shorting Clip

from Cell if Present

Bottom View of Sensor

Figure 8: Shorting Clip

To Pump

Orifice