CPI TUBULAR GAUGE G23
INSTALLATION, OPERATING &
MAINTENANCE INSTRUCTIONS
SEETRU LIMITED
ALBION DOCKSIDE WORKS, HANOVER PLACE, BRISTOL BS1 6UT. ENGLAND
TEL. 0117 9279 204. FAX 0117 929 8193.
EMAIL:
WEB:
www.seetru.com
1
GENERAL
The CPI Tubular gauge is designed and constructed to provide direct level observation of liquids,
including chemicals and solvents. The gauge column is fixed to the outside of a tank and isolated from
the tank by screw down valves which control the flow of liquid into the column and isolate the gauge
when completely closed.
Each isolating valve incorporates an automatic safety valve. Should the sightglass be broken, the
abnormal flow of liquid acting on the ball in the valve, forces it forward onto the seat in the valve body,
thereby checking the flow of liquid until the isolating valves can be closed.
Warning:
The automatic safety valves are only able to operate when the isolating valves are fully open.
It is vital that the isolating valves are always left in a fully open or fully closed position. Never
leave them in a partially open position.
The isolating valves and valveless units are constructed of stainless steel 316 wetted parts, PTFE seals
and plastic handwheel. Other parts of the valves are constructed in stainless steel.
THE TUBULAR COLUMN ASSEMBLY
There are two types of Tubular Column Assemblies:
1. Tubular borosilicate glass tube protected by a stainless steel guard tube, model G231.
2. Tubular borosilicate glass tube protected by a stainless steel guard tube, as above, but further
protected by a polycarbonate tube which completely covers the stainless steel guard tube, model
G232.
All metal parts are rust proofed.
GAUGES FITTED WITH ISOLATING VALVES TOP AND BOTTOM
On these gauges the column can be removed without draining the tank. Before removal close both
isolating valves and drain the column.
GAUGES FITTED WITH ISOLATING VALVE AT BOTTOM ONLY AND A VALVELESS UNIT AT THE
TOP
On these gauges the tank contents must be below the top unit, the bottom isolating valve must be closed
and the column drained before attempting to remove the column.
Note:
Valveless units should not be fitted on pressurised tanks or installed on other tank below the
highest liquid level, as they cannot be fitted with auto safety valves (ASV).
Sampling/Drain Valves or Drain/Vent Plugs should be fitted to isolating valves if tank needs to be
drained.
