Installation Instruction
2
Sprague/Actaris Gas MTU Installation Instructions
Purpose & Scope
These instructions provide a procedure for installing a STAR direct-mount MTU on the Sprague 175,
240, 250, 400, Metris 250, and 400A Itron Gas Meters. This installation instruction covers the Aclara
Catalog number 3551-031-RBS2W/3551-031-RBS2. (The images in this document are for reference only.)
Parts Required
NOTE
The mounting kit contains the exact quantity of hardware required for a single installation. Keep
extra hardware on hand.
NOTE
No repair or maintenance of MTU is required. Defective MTU will be replaced.
NOTE
MTU may be wiped with damp cloth to prevent electrostatic charge hazard.
Item # Item Description Qty
1 Series 3500 Direct Mount MTU 1
2 #10-24 X 1.5" Stainless steel screw 3
3 #10-24 X 5/8” Stainless steel set screw 2
4 #10 X 1/2” Stainless steel screw 4
5 #10-16 X 1/2” Stainless steel screw 2
6 Security seal 4