H-Series User Manual Rev2021A 5
Mechanical - Operation
Determine that the following parameters of your ow metering system are within the specications for the specic
meter being used:
Maximum System Pressure (Specications)
Differential Pressure across meter (Pressure Drop Curves)
Maximum Flow Rate (Pressure Drop Curves)
Metered Fluid Temperature (Sales specication, transmitter specications page 9)
If the metered uid is greater than 28°C (80°F) over ambient, see the “High Temperature Start Up” section below.
With valves (#1) and (#2) closed, slowly open valve (#3) (bypass) to clear the lines of foreign particles and air.
Slowly open the inlet valve (#1). Slowly open the outlet valve (#2). Completely close the bypass valve.
No routine maintenance, cleaning, or lubrication of the ow meter is required. A routine lter cleaning schedule should
be established. The system should be shut down if abnormal noises occur or if unusual differential pressures across the
meter are encountered.
High Temperature Start Up: For uids above 82°C (150°F) based on 21°C (70°F) ambient, a special procedure is required
to prevent thermal shock and permanent damage to the ow meter. The warm up time is determined by the equation
below:
TIME (minutes) = connector size (inches) x (operating temperature (°F)-125)
10
— OR —
TIME (minutes) = connector size (inches) x (operating temperature (°C)-52)
10
Valves (#1) and (#2) must be closed. Open the bypass valve (#3) in gradual steps until the bypass piping is stabilized at
operating temperature. Open valve (#1) slightly and allow the temperature to stabilize around the ow meter. Valve (#1)
can then be opened completely.
Open valve (#2) slightly. The ow meter may make unusual noises or bind at this point. Leave the valve at this setting
until normal meter operation occurs, at which point valve (#2) can be gradually opened all the way. Slowly close the
bypass valve (#3).
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