Arbiter Systems 921A Guide

PD0020500A
Arbiter Systems, Inc
Model 921A Combustible Gas Meter
Filter Replacement Instructions
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 fourcorner 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
7. Disconnect one end of the Breather Filter using the plastic twist-lock Luer fitting. Gently
remove the fitting and attached tubing from the filter.
8. Using a ¼” open-end wrench, carefully remove the plastic fitting from the filter and set aside.
Do not lose this fitting, as it will be used to install the new filter.
9. Place a ¼” wrench on the fitting located o the opposite side of Breather Filter. Carefully
rotate filter until it disconnects from fitting.
10. Remove protective foil caps from new BreatherFilterand carefullyinstall it by reversingsteps
9, 8, 7 and 6.
11. Secure the rear panel.
12. Install the TransformerIn-line Filterin accordance withthe instructions included with the
Transformer In-Line Filter Kit, PD0017000