8
FOR COOL or HOT LIQUID SERVICE
START-UP
Recommended for use to cancel out the “dead leg” (piping from tank
bottom to centerline of meter body) when meter is mounted below
tank. Process medium can be used as reference leg seal fluid if it will
condense in the leg under all conditions. Otherwise, a non-miscible
seal fluid must be used.
CAUTION : If bypass valve is opened at any time when the tank liquid
level is below maximum, the reference leg must again be filled.
NOTE : Do not share fill or vapour return lines with instrument piping.
FOR COOL LIQUID SERVICE (FIG.11)
1. Partially fill reference leg by opening bottom shutoff valve, both
block valves and bypass valve.
2. Crack vent valves on meter body housings; close when clear, bubble-
free liquid flows out.
3. Close bypass and block valve on reference leg.
4. Remove plug from side port in 2inch pipe cross connection used for
reference level reservoir, and fill the leg by opening block valve and
cracking the bypass valve until bubble-free liquid spills out.
5. Close bypass valve.
6. Replace plug in cross
7. Slowly open upper shutoff valve.
HOT (VOLATILE) LIQUIDS (FIG.11)
CAUTION : Maximum meter operating temperature is 200°F. See clause
H before proceeding.
1. Close shutoff valves; open both block valves, vent valves, and by
pass valve.
2. Remove plug from top port in 2" pipe cross. Use process liquid
(cooled to below 200°F) or other suitable seal fluid, and fill both
high and low pressure housings through cross until it runs out vent
valves bubble free.
3. Close HP vent valve and bypass valve. Fill reference leg and replace
Plug.
4. Crack LP (bottom) shutoff valve until fluid flows bubble-free from
LP vent, and re close. AVOID danger of scalding from hot liquid.
5. Slowly open both shutoff valves.
FOR COOL (NON-VOLATILE) LIQUID SERVICE (FIG.12)
START-UP
NOTE : Do not share fill or vapour return lines with instrument piping.
SPECIFIC GRAVITY : For use to determine specific gravity changes
in a process medium.
1. Set bubbler input gas regulator at a pressure slightly higher than
process vessel pressure.
2. Open shutoff valves and block valves. Close bypass valve.
3. Adjust sight bubblers for equal gas flow to each tube, approximately
one bubble per second. Continous bubbling is necessary.
FOR LIQUID LEVEL
Recommended for use whenever solids or sludge are present, or when
instrument must be mounted above tank bottom.
1. Delete LP sight flow bubbler (B)
2. On a pressurised tank, line up the LP port directly to upper tank
connection. On a vented tank, vent the LP port to atmosphere.
3. Follow steps 1 through 3 under “Specific Gravity”.
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