User's Manual

National (Lancaster) Meter Installation
2. Set the ERT module cover aside where it will not be damaged or fill with rain, dirt, or snow. You will use
the cover later in this installation procedure.
Caution Use only dial-type indexes from National, Actaris, Schlumberger, or Sprague meters with the
500G ERT module.
Indexes with bow-tie shaped wrigglers are not compatible with the 500G ERT module. You must use a
compatible index.
Note National (Lancaster) meter indexes are available in different models:
Indexes with legs Indexes with mounting holes
Some National meter indexes have index legs to mount the index on the meter or ERT module. Some
indexes have both legs and index mounting holes and some have just mounting holes. Mounting methods
are dependent on the index. Index types require different mounting screws to attach the index to the 500G
ERT module housing (see Installation Prerequisites on page 7
). Indexes with legs must be mounted to the
ERT module housing mounting posts (1). Indexes with mounting holes must be attached to the ERT
module housing's bracket mounting posts (2).
If your index has legs with mounting screw slots, skip steps 3 and 4. If your index has mounting screw
holes in the index back plate (no legs), perform steps 3 and 4, and skip steps 5 and 6.
3. For indexes with mounting screw holes in the index back plate (no legs), use the replacement index
mounting screws (SCR-0037-001, see Installation Prerequisites on page 7). Place one screw into the
index's right-hand mounting screw hole.
Note National index mounting screws are thread-forming screws and may require more torque.
TDC-1671-000 OpenWay Riva 500G Gas ERT Module Installation Guide, Direct Mount 47
Proprietary and Confidential