Specifications

MODEL 300 COMBUSTION ANALYZER

Instruction 24-9223 4-3

4.1 SENSOR AND/OR CONTROL PANEL REMOVAL

To adjust potentiometers R9, R19, R24, POT1 & POT2, or to replace the

sensors, the sensor and/or control panels must first be removed from the

case as follows:

Equipment Needed

• Medium Flat-Blade Screwdriver

Procedure

1. Remove power from analyzer. If installed, fold down the Optional

auxiliary display panel. Remove water trap by pressing the release tab

and pulling on the trap (The water trap can remain attached to the air

tubing). Disconnect the probe by removing the thermocouple connector

from the analyzer's receptacle. Set the probe/trap assembly aside.

2. Remove sensor cover (Fig. 4-1) by loosening its three knurled screws.

NOTE: Only two knurled screws are used with the battery powered

analyzers. At this point the O

and CO sensors are accessible.

If a printer is installed, remove the screw securing the printer to the

control panel with a screwdriver (Fig. 4-2). Lift the printer straight up,

then back to disengage from keyhole retainers. Set printer in case.

3. Remove the four screws securing the control panel (one located under

the printer ribbon cable) to the case (Fig. 4-3). If the unit is equipped

with an auxiliary panel, pull it straight up then turn it over and place

the panel in the bottom of the case so that it is facing the back.

4. Tilt the control panel upwards so that the calibration pots and the

front panel keys (or the sensors) are accessible (Fig. 4-4).

5. After the analyzer has been serviced, replace the control panel and

auxiliary-display panel by reversing steps 1 thru 4.