GSM-60
ENMET
Manual Revision Date – June 15, 2017
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Manual Part No. – 80003-600
Rev. 1 – December 15, 2016
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. It is recommended that the sensor gasket/manifold also be
checked and potentially replaced at the time the sensor is replaced.
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 PiD (HC) Manifolds
5.4.2 Calibration/Sensor Replacement
Sensor replacement requires that a Factory Calibration be performed. 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
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
