MINI GAUGE G27
Issue: 3
Date: 12.10.10
General Description
The Seetru Mini Gauge consists of a transparent sight tube, protected against breakage by a transparent
polycarbonate guard tube or Stainless Steel with viewing slots.
The sight tube is sealed into collars at both ends which in turn are fixed and sealed to the tank by connection
nipples.
Installation Instructions
Tank connection thread of ¼” BSP.PL. is required [standard Mini Gauge connection].Ensure good surface
for flat face seal.
1. The gauge should not be fitted to tank bosses whilst welding bosses to tank, to avoid heat soak
damage to seals.
2. After welding, check face and bore of tank boss [or tank face if bosses have not been used] is free of
damage and weld splatter. Ensure correct alignment and squareness of top and bottom tank
connection to avoid undue strain on gauge.
3. Fit gauge assembly up to tank, ensure seals are in position on collar, screw nipples (item 9) into tank
to seal gauge to tank. Tightening torque of 12 – 16Nm MAX.
4. Gauge may be adjusted by +/- 2mm on nominal centre distance by slacking off gland nuts and
sliding the collars on the sight tube, retighten gland nuts after adjustment.
The gauge is now ready for service, check for leaks.
Important
Nominal centre distance must not be exceeded by 1.6mm as this could affect the gauge sealing and re-
assembly of the gauge, as per maintenance paragraph, will be necessary.
Operation Faults Table
FAULT
PROBABLE CAUSE
RECTIFICATIOIN
Empty tank
Fill tank
Gauge not filling
Obstruction in gauge
Clear
Mis-use
Renew
Broken sight tube
Mis-alignment
Renew, check face flat
Loose retaining nut
Tighten
Leaks from collar seal
Damaged 'O' ring
Renew
Loose gland nut
Tighten
Sight tube gland leaking
Damaged 'O' ring
Renew
Nipple loose
Tighten
Leaking from tank boss
Sealing washer damaged
Renew