22
23
ITEM PART NUMBER DESCRIPTION (QTY)
1 1705-8868 Main PC Board (1)
2 1705-6755 Display PC Board (1)
3 1705-9247 Interface PC Board (1)
4 1705-9031 Chassis (1)
5 1706-3447 Pump Assembly (1)
6 1705-9494 Nicad Battery Pack
or 1705-9312 Alkaline Battery Pack
7 1706-0716 Case Gasket (1)
8 1706-2498 Filter Housing (1)
9 1705-8157 Dust Filter/Water Stop (1.2 Micron) (1)
10 1705-7118 Speaker (1)
11 1705-8660 Speaker Gasket (1)
12 1705-8140 Speaker Water Barrier (1)
13 1706-0674 Sensor Manifold (1)
14 1702-8374 External Alarm Jack (1)
15 1705-0295 RFI Screen (1)
16 1706-1284 Case Top (1)
17 1705-8306 Key Pad (1)
18 1706-0500 Alarm Lens (1)
19 1705-8652 Alarm Lens Gasket (1)
The following items numbers refer to the exploded view
drawing on pages 24 and 25.
9.
R
EPLACEMENT
P
ARTS
WARNING: When removing a sensor from
service, the appropriate sensor plug
must be installed to ensure proper
instrument operation. Toxic/O
2
Sensor Plug P/N 1704-6947
Combustible Sensor Plug
P/N 1706-2647
8.4.1 TOXIC/OXYGEN SENSOR REMOVAL/
REPLACEMENT
• To remove a toxic or oxygen sensor, grasp the sensor
and lift it straight up. Use care to avoid bending the
sensor pins.
WARNING: When removing a toxic sensor for
storage, connect a shorting wire to
the two pins as shown.
• New toxic sensors are shipped with a shorting wire
attached. Remove the shorting wire from the new
sensor.
• Immediately install the sensor in the instrument. Never
apply pressure to the area inside of the black O-Ring seal
at the top of the sensor.
8.4.2 COMBUSTIBLE SENSOR REMOVAL/
REPLACEMENT
• To remove the combustible sensor, grasp the sensor and
lift it straight up.
• Press the new sensor firmly into the sockets on the
PC board.
8.5 CHANGING THE INTERNAL FILTER
If the internal dust filter/water stop becomes blocked, a
PUMP FAULT alarm will result. The filter must be
replaced immediately before continuing operation. To
remove and replace the internal dust filter/water stop from
the instrument:
• Unscrew and remove the knurled sample inlet fitting from
the instrument as shown in Figure 6.
• Grasp the dust filter/water stop from the instrument and
pull straight out to remove.
• Replace the dust filter/water stop making sure that the
larger diameter opening of the filter is facing inward.
• Replace the knurled sample inlet fitting.
NOTE: The ATX612 will remain in a PUMP FAULT
condition if operation is attempted with the dust
filter/water stop removed.
