Arbiter Systems 921A Replacement Instructions

Model 921A Combustible Gas Meter

Equipment Required

1. Annual Filter Maintenance Kit, P/N: AS0035100, which includes the following:
- Breather Filter (1 each)
- Particulate Filters (5 each: 3 internal, 2 external replacements).
- Transformer In-Line Filter Kit, P/N: AS0026900 (1 each)
2. T10 Torx Driver
3. ¼" open-end wrench.

Procedure

To replace the Model 921A internal filters perform the following steps:
1. Using a T10 Torx driver, remove the four corner screws from the rear panel.
2. Locate the three Particulate Filters (blue/white).
NOTE: Three Particulate Filters replace the Model 921A internal filters and the remaining two
are intended to replace those used externally when performing measurements. Replace the
Particulate Filters one at a time so that the corresponding flexible tubing removed is replace on
the correct filter. Gently move adjacent flexible tubing aside when disconnecting filter.
3. Disconnect the Particulate Filter using the plastic twist-lock Luer fitting. Gently remove the
fitting and attached tubing from the filter.
WARNING: DO NOT over tighten or use extreme downward pressure when re-attaching filter
and flexible tubing.
4. Install new Particulate Filter and gently re-install flexible tubing.
5. Locate the Breather Filter (cylindrical tube) which is located at the top front of unit, as
viewed from the rear.
6. Carefully maneuver the filter from its current position outward so that the flexible tubing can
be removed without interference.
PD0020500A
Arbiter Systems, Inc
Filter Replacement Instructions