User's Manual

National (Lancaster) Meter Installation
2. Set the ERT 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
100G.
Indexes with bow-tie shaped wrigglers are not compatible with the 100G. 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. 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 100G
housing (see Installation Prerequisites on page 14
). Indexes with legs must be mounted to the ERT
housing mounting posts (1). Indexes with mounting holes must be attached to the ERT 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 14). 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-0823-014 100G Series Gas ERT Module Installation Guide, Direct Mount 51
Proprietary and Confidential